Patent Publication Number: US-9890976-B2

Title: Air-conditioning apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to an air-conditioning apparatus including a plurality of indoor units and capable of heating and cooling at the same time, such as a multi-air-conditioning apparatus for a building. 
     BACKGROUND ART 
     Indoor units in air-conditioning apparatuses placed in buildings, houses, or the like can use a convective (air-sending type) heat exchanger for forcibly exchanging heat using an blower device and a radiant (panel) heat exchanger for exchanging heat by natural convection without sending air using an blower device. The convective heat exchanger can perform quick cooling, but may cause a person to feel uncomfortable or the like by directly sending air. The radiant indoor heat exchanger can perform heating and cooling operation without directly sending air, but cannot perform rapid heating and cooling operation. An air-conditioning system including both the radiant panel heat exchanger and the convective heat exchanger has been proposed (see, for example, Patent Literature 1). Patent Literature 1 discloses an air-conditioning system that has a configuration in which the radiant panel heat exchanger is arranged on the floor side, the convective heat exchanger is arranged on the ceiling side, and the radiant panel heat exchanger and convective heat exchanger are connected in series and that circulates a refrigerant. 
     An air-conditioning apparatus that does not have a configuration in which an outdoor unit and indoor units are not directly connected so as to allow a refrigerant to flow therebetween but has a configuration in which it includes a first-side refrigerant circuit and a second-side refrigerant circuit and exchanges heat therebetween using an intermediate heat exchanger has been proposed (see, for example, Patent Literature 2). The air-conditioning apparatus described in Patent Literature 2 is operable principally in four operation modes of cooling only operation, heating only operation, heating main operation, and cooling main operation and can individually set the operation mode for each indoor unit using a convective heat exchanger including an blower device in accordance with the situation of the room or the like. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Application Publication No. 10-38324 
     Patent Literature 2: International Publication No. WO 2010/113296 
     SUMMARY OF INVENTION 
     Technical Problem 
     Patent Literature 1 discloses the air-conditioning system in which a single radiant panel heat exchanging portion and a single air-sending heat exchanging portion are connected. To perform heating and cooling operation for the entire structure of a building or the like, a plurality of indoor units, as illustrated in Patent Literature 2, are necessary. Not only in the case where the convective heat exchanger is used, as illustrated in Patent Literature 2, but also in the case where the radiant panel heat exchanger is used, it is desired that the indoor units be appropriately arranged and comfortable air-conditioning matching with the situation or the like of a room be provided. 
     The present invention is made to overcome the above-described problems. It is an object of the present invention to provide an air-conditioning apparatus capable of performing comfortable air-conditioning in accordance with the uses and arrangement of rooms inside a structure of a building or the like. 
     Solution to Problem 
     An air-conditioning apparatus according to the present invention includes an outdoor unit including a compressor configured to compress a first-side refrigerant and a heat-source-side heat exchanger configured to cause heat exchange between air and the first-side refrigerant, a plurality of indoor units including indoor heat exchangers configured to cause heat exchange between the air and a second-side refrigerant, a plurality of intermediate heat exchangers configured to cause heat exchange between the first-side refrigerant and the second-side refrigerant, the intermediate heat exchangers being connected to the outdoor unit by a first-side refrigerant pipe and connected to the indoor units by a second-side refrigerant pipe, and a flow switching device configured to switch combination of connection between each of the indoor units and each of the intermediate heat exchangers. The plurality of indoor units include convective indoor units and radiant indoor units, each of the convective indoor units includes a convective indoor heat exchanger, and each of the radiant indoor units includes a radiant indoor heat exchanger. The second-side refrigerant flowing out of each of the convective indoor units in the cooling operation flows in the radiant indoor units, and the second-side refrigerant is supplied to each of the radiant indoor heat exchanger after the temperature of the second-side refrigerant rises by the heat exchange of the convective indoor heat exchanger. 
     Advantageous Effects of Invention 
     The air-conditioning apparatus according to the present invention is an air-conditioning system including indoor units including convective heat exchangers and radiant indoor heat exchangers. This air-conditioning apparatus can perform air-conditioning in accordance with the use and load of each room, while at the same time greater space and energy savings are achieved, in comparison with cases where both a convective air-conditioning system and a radiant air-conditioning system are installed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a refrigerant circuit diagram that illustrates Embodiment 1 of an air-conditioning apparatus of the present invention. 
         FIG. 2  is a refrigerant circuit diagram that illustrates streams of a first-side refrigerant and a second-side refrigerant in cooling only operation mode in the air-conditioning apparatus illustrated in  FIG. 1 . 
         FIG. 3  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating only operation mode in the air-conditioning apparatus illustrated in  FIG. 1 . 
         FIG. 4  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode 1 in the air-conditioning apparatus illustrated in  FIG. 1 . 
         FIG. 5  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode 2 in the air-conditioning apparatus illustrated in  FIG. 1 . 
         FIG. 6  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode 1 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . 
         FIG. 7  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode 2 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . 
         FIG. 8  is a refrigerant circuit diagram that illustrates Embodiment 2 of the air-conditioning apparatus of the present invention. 
         FIG. 9  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling only operation mode in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 10  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating only operation mode in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 11  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 12  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 13  illustrates an example of placement of an indoor unit in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 14  illustrates another example of placement of the indoor unit in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 15  illustrates another example of placement of the indoor unit in the air-conditioning apparatus illustrated in  FIG. 8 . 
         FIG. 16  is a refrigerant circuit diagram that illustrates Embodiment 3 of the air-conditioning apparatus of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiment 1 
       FIG. 1  is a refrigerant circuit diagram that illustrates Embodiment 1 of an air-conditioning apparatus of the present invention. As illustrated in  FIG. 1 , when an air-conditioning apparatus  1  is considered in units, it includes an outdoor unit  1 A being a heat source device, a plurality of indoor units C 1   n  and C 2   m  (hereinafter referred to simply as indoor units C when they are referred to without distinction), and an intermediate unit  1 B. The letters m and n are natural numbers more than zero, m indicates the number of radiant indoor heat exchangers, and n indicates the number of convective indoor heat exchangers. In Embodiment 1, the case where m is three and n is three is illustrated. The outdoor unit  1 A and intermediate unit  1 B are connected by a first refrigerant pipe. The intermediate unit  1 B and each of the plurality of indoor units C are connected by a second refrigerant pipe. Cooling energy or heating energy produced by the outdoor unit  1 A is conveyed to the indoor units C 1   n  and C 2   m  through the intermediate unit  1 B. 
     (Configuration of Outdoor Unit  1 A) 
     The outdoor unit  1 A is typically placed in an outside space, such as one on the roof of a building, and is configured to supply cooling energy or heating energy to the indoor units C 1   n  and C 2   m  through the intermediate unit  1 B. The outdoor unit  1 A includes a compressor  103 , a heat-source-side heat exchanger  104 , and a first flow switching device  106 . The compressor  103  is configured to suck a first-side refrigerant in gaseous state, compress it to a high-temperature and high-pressure state, and discharge it. One example of the compressor  103  may be an inverter compressor having a controllable capacity. The heat-source-side heat exchanger  104  functions as a radiator in cooling operation and as an evaporator in heating operation and is configured to cause heat exchange between outdoor air supplied through a fan  104   a  and the first-side refrigerant. 
     The first flow switching device  106  may include, for example, a four-way valve and is configured to switch a flow of the first-side refrigerant in cooling operation (cooling only operation mode and cooling main operation mode) and in heating operation (heating only operation mode and heating main operation mode). Specifically, in cooling operation, the first flow switching device  106  switches the refrigerant passage such that the first-side refrigerant discharged from the compressor  103  flows into the heat-source-side heat exchanger  104  and the first-side refrigerant exiting from the intermediate unit  1 B flows into the compressor  103 . In heating operation, the first flow switching device  106  switches the refrigerant passage such that the first-side refrigerant discharged from the compressor  103  flows into the intermediate unit  1 B and the first-side refrigerant exiting from the heat-source-side heat exchanger  104  flows into the compressor  103 . 
     Four check valves  113   a  to  113   d  each has the function of limiting the passing direction in which the first-side refrigerant passes between the outdoor unit  1 A and intermediate unit  1 B to a fixed direction. The check valve  113   a  is disposed on a refrigerant pipe connecting the first flow switching device  106  and valves  111   c  and  111   d  and allows the first-side refrigerant to flow in only a direction from the valves  111   c  and  111   d  toward the first flow switching device  106 . The check valve  113   b  is disposed on a refrigerant pipe connecting the heat-source-side heat exchanger  104  and a valve  111   e  and allows the first-side refrigerant to flow in only a direction from the heat-source-side heat exchanger  104  toward the valve  111   e . The check valve  113   c  is disposed on a refrigerant pipe that connects a refrigerant pipe connecting the first flow switching device  106  and the check valve  113   a  and a refrigerant pipe connecting the check valve  113   b  and the valve  111   e  and allows the first-side refrigerant to flow in only a direction from the side of the refrigerant pipe connecting the first flow switching device  106  and the check valve  113   a  toward the side of the refrigerant pipe connecting the check valve  113   b  and the valve  111   e . The check valve  113   d  is disposed on a refrigerant pipe that connects a refrigerant pipe connecting the check valve  113   a  and the valves  111   c  and  111   d  and a refrigerant pipe connecting the heat-source-side heat exchanger  104  and the check valve  113   b  and allows the first-side refrigerant to flow in only a direction from the side of the refrigerant pipe connecting the check valve  113   a  and the valves  111   c  and  111   d  toward the side of the refrigerant pipe connecting the heat-source-side heat exchanger  104  and the check valve  113   b.    
     (Configuration of Intermediate Unit  1 B) 
     The intermediate unit  1 B may be disposed on a location or the like different from the outdoor space and indoor space as a housing different from the outdoor unit  1 A and indoor units C and is connected to the outdoor unit  1 A through the first refrigerant pipe and to the indoor units C through the second refrigerant pipes. The intermediate unit  1 B includes intermediate heat exchangers  107   a  and  107   b , expansion mechanisms  105   a  and  105   b , pumps  109   a  and  109   b , and valves  111   a  to  111   f ,  112   na  to  112   nd ,  115   ma  to  115   md , and  114   a  to  114   d . The intermediate unit  1 B is connected to the outdoor unit  1 A by the first refrigerant pipe through the expansion mechanisms  105   a  and  105   b  and the valves  111   a  to  111   f . The intermediate unit  1 B is connected to each of the plurality of indoor units C, which are the indoor units C 1   n  and C 2   m , through the pumps  109   a  and  109   b  and the valves  112   na  to  112   nd ,  115   ma  to  115   dm , and  114   a  to  114   d.    
     Examples of each of the intermediate heat exchangers  107   a  and  107   b  may include a double pipe heat exchanger, plate heat exchanger, microchannel water heat exchanger, and shell and tube heat exchanger. Each of the intermediate heat exchangers  107   a  and  107   b  includes a refrigerant passage through which the first-side refrigerant passes and a refrigerant passage through which the second-side refrigerant passes. Each of the intermediate heat exchangers  107   a  and  107   b  functions as a radiator or evaporator and causes heat exchange between the first-side refrigerant and the second-side refrigerant. That is, the intermediate heat exchangers  107   a  and  107   b  cause heat exchange between the first-side refrigerant circulating in a first-side refrigerant circuit  2  and the second-side refrigerant circulating in a second-side refrigerant circuit  3 . 
     The intermediate heat exchanger  107   a  is disposed between the expansion mechanism  105   a  and the valve  111   c  on the side of the first-side refrigerant circuit  2  and between the valve  114   a  and the pump  109   a  on the side of the second-side refrigerant circuit  3 . The intermediate heat exchanger  107   b  is disposed between the expansion mechanism  105   b  and the valve  111   d  on the side of the first-side refrigerant circuit  2  and between the valve  114   b  and the pump  109   b  on the side of the second-side refrigerant circuit  3 . When the intermediate heat exchangers  107   a  and  107   b  are plate heat exchangers, in consideration of phase change of the first-side refrigerant, they may preferably be oriented such that, when the first-side refrigerant removes heat, the first-side refrigerant flows therein from below and, when the first-side refrigerant rejects heat, the first-side refrigerant flows therein from above. 
     One example of each of the expansion mechanisms  105   a  and  105   b  may be a mechanism having a variably controllable opening degree (opening size), such as an electronic expansion valve. Each of the expansion mechanisms  105   a  and  105   b  has the function as a pressure reducing and expansion valve configured to reduce the pressure of the first-side refrigerant in the first-side refrigerant circuit  2  and expand it. The expansion mechanism  105   a  is disposed between the intermediate heat exchanger  107   a  and the valve  111   e . The expansion mechanism  105   b  is disposed between the intermediate heat exchanger  107   b  and the valve  111   e.    
     One example of each of the third flow switching devices  111   a  to  111   f  may be a two-way valve. They are configured to switch the passage of the first-side refrigerant flowing to and exiting from the intermediate heat exchangers  107   a  and  107   b  through the first refrigerant pipe in the first-side refrigerant circuit  2 . Specifically, the valve  111   a  is disposed on a refrigerant pipe that connects a refrigerant pipe connecting the intermediate heat exchanger  107   a  and the valve  111   c  and a refrigerant pipe connecting the valve  111   b  and the check valve  113   b  (or valve  111   f ). The valve  111   b  is disposed on a refrigerant pipe that connects a refrigerant pipe connecting the intermediate heat exchanger  107   b  and the valve  111   d  and a refrigerant pipe connecting the valve  111   a  and the check valve  113   b  (or valve  111   f ). The valve  111   c  is disposed on a refrigerant pipe connecting the check valve  113   a  and the intermediate heat exchanger  107   a . The valve  111   d  is disposed on a refrigerant pipe connecting the check valve  113   a  and the intermediate heat exchanger  107   b . The valve  111   e  is disposed on a refrigerant pipe connecting the expansion mechanism  105   a  (or expansion mechanism  105   b ) and the check valve  113   a . The valve  111   f  is disposed on a refrigerant pipe that bypasses the check valves  113   a  and  113   b . In place of the four valves  111   a  to  111   d , two four-way valves disposed on the intermediate heat exchangers  107   a  and  107   b , respectively, may be disposed. 
     The pumps  109   a  and  109   b  are configured to pump and circulate the second-side refrigerant inside the second-side refrigerant circuit  3 . One example of each of the pumps  109   a  and  109   b  may be a pump having a controllable capacity. The suction side of the pump  109   a  is connected to the intermediate heat exchanger  107   a , and its discharge side is separated and connected to the plurality of valves  112   na . The suction side of the pump  109   b  is connected to the intermediate heat exchanger  107   b , and its discharge side is separated and connected to the plurality of valves  112   nb.    
     A second flow switching device includes the valves  112   na  to  112   nd ,  114   a  to  114   d , and  115   ma  to  115   md . The valves  112   na ,  112   nb ,  112   nc , and  112   nd  are configured to switch the second-side refrigerant passage to be delivered to convective indoor heat exchangers  108   n  in the convective indoor units C 1   n . The valves  115   ma ,  115   dm ,  114   a , and  114   b  are configured to switch the second-side refrigerant passage for delivering the refrigerant to indoor heat exchangers  116   m  in the radiant indoor units C 2   m . The flow rates of the flows of the second-side refrigerant passing through the indoor heat exchangers  108   n  and  116   m  are controlled by adjustment of the opening degrees (opening sizes) of the valves  112   na  to  112   nd  and  115   ma  to  115   md.    
     (Configurations of Indoor Units C 1   n  and C 2   m ) 
     The air-conditioning apparatus  1  includes the convective indoor units C 1   n  including only the convective indoor heat exchangers  108   n  and the radiant indoor units C 2   m  including only the radiant indoor heat exchangers  116   m . Each of the convective indoor units C 1   n  includes the convective indoor heat exchanger  108   n  and an blower device  108   na  and is configured to perform air-conditioning by heating operation or cooling operation for an indoor space. The convective indoor heat exchanger  108   n  functions as a radiator in heating operation and as an evaporator in cooling operation. The convective indoor heat exchanger  108   n  causes heat exchange between indoor air supplied from the blower device and the second-side refrigerant and produces air for heating or air for cooling to be supplied to the indoor space. The refrigerant pipe connected to one side of the convective indoor heat exchanger  108   n  is separated into the routes connected to the valves  112   na  and  112   nb , respectively. The refrigerant pipe connected to another side of the convective indoor heat exchanger  108   n  is separated into the routes connected to the valves  112   nc  and  112   nd , respectively. 
     Each of the radiant indoor units C 2   m  includes the radiant indoor heat exchanger (chilled beam)  116   m  and is configured to perform air-conditioning by heating operation or cooling operation for the indoor space to which it is equipped. The radiant indoor heat exchanger  116   m  functions as a radiator in heating operation and as an evaporator in cooling operation. Because the radiant indoor heat exchanger  116   m  does not include an blower device, it causes heat exchange between indoor air supplied by natural convection and the second-side refrigerant and produces air for heating or air for cooling to be supplied to the indoor space. The refrigerant pipe connected to one side of the radiant indoor heat exchanger  116   m  is separated into the routes connected to the valves  115   ma  and  115   mb , respectively. The refrigerant pipe connected to another side of the radiant indoor heat exchanger  116   m  is separated into the routes connected to the valves  115   mc  and  115   md , respectively. 
     Here, the plurality of convective indoor heat exchangers  108   n  are connected in parallel with each other, and the plurality of radiant indoor heat exchangers  116   m  are connected in parallel with each other. The plurality of radiant indoor heat exchangers  116   m  are disposed downflow of the plurality of convective indoor heat exchangers  108   n . Thus the second-side refrigerant after heat exchange in the convective indoor heat exchangers  108   n  is supplied to the radiant indoor heat exchangers  116   m . The intermediate unit  1 B includes the pipes and valves  114   c  and  114   d  for bypassing the plurality of convective indoor heat exchangers  108   n  and is configured to enable the second-side refrigerant from the intermediate heat exchangers  107   a  and  107   b  to bypass the plurality of convective indoor heat exchangers  108   n  and to be directly supplied to the downstream radiant indoor heat exchangers  116   m.    
     (Configuration of Refrigerant Circuit) 
     The air-conditioning apparatus  1  illustrated in  FIG. 1  includes the two refrigerant circuits of the first-side refrigerant circuit  2  and the second-side refrigerant circuit  3 . The first-side refrigerant circuit  2  includes the compressor  103 , heat-source-side heat exchanger  104 , expansion mechanisms  105   a  and  105   b , first flow switching device  106 , intermediate heat exchangers  107   a  and  107   b , and valves  111   a  to  111   f . The first-side refrigerant circuit  2  is configured as the refrigerant circuit by connecting the compressor  103 , first flow switching device  106 , heat-source-side heat exchanger  104 , expansion mechanisms  105   a  and  105   b , intermediate heat exchangers  107   a  and  107   b , first flow switching device  106 , and compressor  103  in this order by the first refrigerant pipe. Examples of the first-side refrigerant passing through the first-side refrigerant circuit  2  may include a CFC refrigerant, such as R410A or R32, a hydrocarbon refrigerant, such as a propane, and a natural refrigerant, such as carbon dioxide. As the first-side refrigerant, an azeotropic refrigerant mixture, such as one including R410A, or a non-azeotropic refrigerant mixture, such as one including R407C, R32, and R134a or one including R32 and R1234yf. 
     The second-side refrigerant circuit  3  includes the intermediate heat exchangers  107   a  and  107   b , convective indoor heat exchangers  108   n , radiant indoor heat exchangers  116   m , pumps  109   a  and  109   b , and valves  112   na  to  112   nd ,  115   ma  to  115   dm , and  114   a  to  114   d . The second-side refrigerant circuit  3  is configured as the refrigerant circuit by connecting the pumps  109   a  and  109   b , convective indoor heat exchangers  108   n , radiant indoor heat exchangers  116   m , intermediate heat exchangers  107   a  and  107   b , and pumps  109   a  and  109   b  in this order by the second refrigerant pipe. Examples of the second-side refrigerant passing through the second-side refrigerant circuit may include antifreeze (brine), water, a mixture thereof, and a mixture of water and an anticorrosive additive. The use of such a second-side refrigerant contributes to improved safety even if the second-side refrigerant leaks from the indoor unit C to the indoor space because a material having a high level of safety is used as the second-side refrigerant. 
     In Embodiment 1, the number of the convective indoor heat exchangers is three (n=3) and the number of the radiant indoor heat exchangers is three (m=3). However, the numbers may be one, two, four or more. The circuit structures of the above-described first-side refrigerant circuit  2  and second-side refrigerant circuit  3  are based on the refrigerant circuits through which the refrigerant of the same type passes. 
     The operation modes which the air-conditioning apparatus of Embodiment 1 can operate may include the cooling only operation mode, where all of the indoor units C perform cooling operation, the heating only operation mode, where all of the indoor units C perform heating operation, the cooling main operation mode, where cooling operation or heating operation can be selected for each of the indoor units C and the cooling load is the larger, and the heating main operation mode, where cooling operation or heating operation can be individually selected for each of the indoor units C and the heating load is the larger. Each of the operation modes is described below with the streams of the first-side refrigerant and second-side refrigerant. 
     (Cooling Only Operation Mode) 
       FIG. 2  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and second-side refrigerant in cooling only operation mode in the air-conditioning apparatus  1  illustrated in  FIG. 1 . In  FIG. 2 , the pipes indicated by the thick lines represent the pipes through which the first-side refrigerant and second-side refrigerant pass, the directions in which the first-side refrigerant flows are indicated by the solid line arrows, and the directions in which the second-side refrigerant flows are indicated by the broken line arrows. The same applies to  FIGS. 3 to 7 . The cooling only operation mode is described below with reference to  FIG. 2 . 
     In the first-side refrigerant circuit  2 , the first flow switching device  106  is switched in advance such that the first-side refrigerant discharged from the compressor  103  flows into the heat-source-side heat exchanger  104  and the first-side refrigerant exiting from the intermediate unit  1 B flows into the compressor  103 . The valves  111   a ,  111   b , and  111   f  are in a closed state, and the valves  111   c ,  111   d , and  111   e  are in an opened state. In the second-side refrigerant circuit, the valves  112   na  to  112   nd ,  114   a ,  114   b , and  115   ma  to  115   dm  are in an open state, and the valves  114   c  and  114   d  are in a closed state. 
     The first-side refrigerant in a low-temperature and low-pressure gaseous state is compressed by the compressor  103  to a high-temperature and high-pressure state. The first-side refrigerant is discharged from the compressor  103 , passes through the first flow switching device  106 , flows into the heat-source-side heat exchanger  104 , and transfers heat to the outdoor air. The first-side refrigerant is partially or entirely condensed to a gas-liquid two-phase state or liquid state. The first-side refrigerant in the gas-liquid two-phase state or liquid state exiting from the heat-source-side heat exchanger  104  passes through the check valve  113   b , exits from the outdoor unit  1 A, and flows into the intermediate unit  1 B. The first-side refrigerant flowing to the intermediate unit  1 B passes through the valve  111   e  and is divided into portions, and the portions flow into the expansion mechanisms  105   a  and  105   b , respectively, are thus expanded and decompressed, become a low-temperature and low-pressure gas-liquid two-phase state, and flow into the intermediate heat exchangers  107   a  and  107   b , respectively, in parallel with each other. 
     The first-side refrigerant in the gas-liquid two-phase state flowing to each of the intermediate heat exchangers  107   a  and  107   b  receives heat from the second-side refrigerant, evaporates, and becomes a low-temperature and low-pressure gaseous state. The first-side refrigerants in the low-temperature and low-pressure gaseous state exiting from the intermediate heat exchangers  107   a  and  107   b  pass through the valves  111   c  and  111   d  and then marge together. The merged first-side refrigerant exits from the intermediate unit  1 B and flows into the outdoor unit  1 A. The first-side refrigerant in the gaseous state flowing to the outdoor unit  1 A passes through the check valve  113   a  and first flow switching device  106 , is sucked into the compressor  103 , and is compressed again. 
     Next, the flow of the second-side refrigerant in the second-side refrigerant circuit is described. The low-temperature second-side refrigerant is caused to exit from the intermediate heat exchanger  107   a  by driving of the pump  109   a , passes through the valves  112   na , and then flows into the convective indoor heat exchangers  108   n  in the convective indoor units C 1   n . Similarly, the low-temperature second-side refrigerant is caused to exit from the intermediate heat exchanger  107   b  by driving of the pump  109   b , passes through the valves  112   nb , and then flows into the convective indoor heat exchangers  108   n  in the convective indoor units C 1   n . The second-side refrigerant flowing from the intermediate unit  1 B to each of the convective indoor heat exchangers  108   n  in the above-described way cools the indoor air, becomes a high-temperature state, exits from the convective indoor units C 1   n , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from each of the convective indoor heat exchangers  108   n  is divided into a portion that is to return to the intermediate heat exchangers  107   a  and  107   b  and another portion that is to flow into the radiant indoor units. Specifically, the second-side refrigerant is divided into a second-side refrigerant portion that is to flow into the intermediate heat exchanger  107   a  through the valves  112   nc  and  114   a  and another second-side refrigerant portion that moves from the valves  112   nc  toward the radiant indoor units C 2   m . Similarly, the second-side refrigerant is divided into a second-side refrigerant portion that is to flow into the intermediate heat exchanger  107   b  through the valves  112   nd  and  114   b  and another second-side refrigerant portion that moves from the valves  112   nd  toward the radiant indoor units C 2   m.    
     The second-side refrigerant flowing toward the radiant indoor units C 2   m  passes through the valves  115   ma , then exits from the intermediate unit  1 B, and flows into the radiant indoor heat exchangers  116   m  in the radiant indoor units C 2   m . The second-side refrigerant flowing from the convective indoor units C 1   n  and flowing to the convective indoor heat exchangers  108   n  through the intermediate unit  1 B in this way cools the indoor air, becomes a high-temperature state, exits from the convective indoor units C 1   n , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the radiant indoor heat exchangers  116   m  flows into the intermediate unit  1 B. The second-side refrigerant flows into the intermediate heat exchanger  107   a  through the valves  115   mc  and into the intermediate heat exchanger  107   b  through the valves  115   dm . The flows of the second-side refrigerant flowing to the intermediate heat exchangers  107   a  and  107   b  are cooled by the first-side refrigerant in the low-temperature state and exit from the intermediate heat exchangers  107   a  and  107   b , respectively. The flows of the second-side refrigerant exiting from the intermediate heat exchangers  107   a  and  107   b  flow into the pumps  109   a  and  109   b , respectively, and are ejected again. 
     (Heating Only Operation Mode) 
       FIG. 3  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and second-side refrigerant in heating only operation mode in the air-conditioning apparatus  1  illustrated in  FIG. 1 . The heating only operation mode is described below with reference to  FIG. 3 . In the first-side refrigerant circuit  2 , the first flow switching device  106  is switched in advance such that the first-side refrigerant discharged from the compressor  103  flows into the intermediate unit  1 B and the first-side refrigerant exiting from the heat-source-side heat exchanger  104  flows into the compressor  103 . The valves  111   a ,  111   b , and  111   f  are in an open state, and the valves  111   c ,  111   d , and  111   e  are in a closed state. In the second-side refrigerant circuit, the valves  112   na  to  112   nd ,  114   a ,  114   b , and  115   ma  to  115   dm  are in an open state, and the valves  114   c  and  114   d  are in a closed state, as in the case of the cooling only operation mode. 
     The first-side refrigerant in a low-temperature and low-pressure gaseous state is compressed by the compressor  103  to a high-temperature and high-pressure state. The first-side refrigerant is discharged from the compressor  103 , passes through the first flow switching device  106  and check valve  113   c , exits from the outdoor unit  1 A, and flows into the intermediate unit  1 B. The first-side refrigerant flowing to the intermediate unit  1 B is divided into portions that are to flow into the intermediate heat exchangers  107   a  and  107   b  in parallel with each other through the valves  111   a  and  111   b , respectively. The first-side refrigerants in the high-temperature and high-pressure state flowing to the intermediate heat exchangers  107   a  and  107   b  transfer heat to the second-side refrigerant and are partially or entirely condensed to a gas-liquid two-phase state or liquid state. The first-side refrigerants in the gas-liquid two-phase state or liquid state exiting from the intermediate heat exchangers  107   a  and  107   b  flow into the expansion mechanisms  105   a  and  105   b , respectively, are thus expanded and decompressed, and become a low-temperature and low-pressure gas-liquid two-phase state. After that, the first-side refrigerants exiting from the expansion mechanisms  105   a  and  105   b  merge with each other, and the merged first-side refrigerant passes through the valve  111   f , exits from the intermediate unit  1 B, and flows into the outdoor unit  1 A. The first-side refrigerant in the gas-liquid two-phase state flowing to the outdoor unit  1 A passes through the check valve  113   d , flows into the heat-source-side heat exchanger  104 , receives heat from the outdoor air, evaporates, becomes a low-temperature and low-pressure gaseous state, passes through the first flow switching device  106 , is sucked into the compressor  103 , and is compressed again. 
     The flow of the second-side refrigerant in the second-side refrigerant circuit is substantially the same as those in the cooling only operation mode, and only heat movements different from those in the cooling only operation mode are described below. The high-temperature flows of the second-side refrigerant from the pumps  109   a  and  109   b  heat the indoor air in the convective heat exchangers  108   n , become a low-temperature state, heat the indoor air in the radiant indoor heat exchangers  116   m , become a further lower temperature state, and are then heated in the intermediate heat exchangers  107   a  and  107   b  by the first-side refrigerant in the high-temperature state. The flows of the second-side refrigerant in the high-temperature state flow into the pumps  109   a  and  109   b  and are ejected again. 
     (Cooling Main Operation Mode 1) 
       FIG. 4  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode 1 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . The cooling main operation mode 1 is the operation mode in which the cooling load is larger than the heating load and at least one of the convective indoor units C 1   n  performs heating operation. In  FIG. 4 , the convective indoor unit C 11  and radiant indoor unit C 21  perform heating operation, and the convective indoor units C 12  and C 13  and radiant indoor units C 22  and C 23  perform cooling operation. 
     In the first-side refrigerant circuit  2 , the first flow switching device  106  is switched in advance such that the first-side refrigerant discharged from the compressor  103  flows into the heat-source-side heat exchanger  104  and the first-side refrigerant exiting from the intermediate unit  1 B flows into the compressor  103 . The valves  111   a ,  111   d ,  111   e , and  111   f  are in a closed state, and the valves  111   b  and  111   c  are in an open state. In the second-side refrigerant circuit, the valves  1121   b ,  1121   d ,  1122   a ,  1122   c ,  1123   a ,  1123   c ,  114   a ,  114   b ,  1151   b ,  1151   d ,  1152   a ,  1152   c ,  1153   a , and  1153   c  are in an open state, and the valves  1121   a ,  1121   c ,  1122   b ,  1122   d ,  1123   b ,  1123   d ,  114   c ,  114   d ,  1151   a ,  1151   c ,  1152   b ,  1152   d ,  1153   b , and  1153   d  are in a closed state. 
     The first-side refrigerant in a low-temperature and low-pressure gaseous state is compressed by the compressor  103 , becomes a high-temperature and high-pressure state, is discharged, passes through the first flow switching device  106 , flows into the heat-source-side heat exchanger  104 , transfers heat to the outdoor air, and is partially or entirely condensed to a gas-liquid two-phase state. The first-side refrigerant in the gas-liquid two-phase state exiting from the heat-source-side heat exchanger  104  passes through the check valve  113   b , exits from the outdoor unit  1 A, and flows into the intermediate unit  1 B. 
     The first-side refrigerant in the gas-liquid two-phase state flowing to the intermediate unit  1 B passes through the valve  111   b , flows into the intermediate heat exchanger  107   b , heats the second-side refrigerant, and is thus further condensed. The first-side refrigerant exiting from the intermediate heat exchanger  107   b  passes through the expansion mechanisms  105   b  and  105   a , is thus expanded and decompressed, becomes a low-temperature and low-pressure gas-liquid two-phase state, and flows into the intermediate heat exchanger  107   a . The first-side refrigerant in the gas-liquid two-phase state flowing to the intermediate heat exchanger  107   a  receives heat from the second-side refrigerant, evaporates, and becomes a low-temperature and low-pressure gaseous state. The first-side refrigerant in the low-temperature and low-pressure gaseous state exiting from the intermediate heat exchanger  107   a  passes through the valve  111   c , exits from the intermediate unit  1 B, and flows into the outdoor unit  1 A. The first-side refrigerant in the gaseous state flowing to the outdoor unit  1 A passes through the check valve  113   a  and first flow switching device  106 , is sucked into the compressor  103 , and is compressed again. 
     Next, the flow of the second-side refrigerant in the second-side refrigerant circuit is described. The low-temperature second-side refrigerant ejected by driving of the pump  109   a  is divided into portions, and the portions pass through the valves  1122   a  and  1123   a , respectively, exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1082  in the convective indoor unit C 12  and the convective indoor heat exchanger  1083  in the convective indoor unit C 13 , respectively. The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1082  and  1083  cool the indoor air, become a high-temperature state, exit from the convective indoor units C 12  and C 13 , respectively, and flow into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the convective indoor heat exchanger  1082 , flowing to the intermediate unit  1 B, and passing through the valve  1122   c  and the second-side refrigerant exiting from the convective indoor heat exchanger  1083 , flowing to the intermediate unit  1 B, and passing through the valve  1123   c  merge with each other, and the merged second-side refrigerant is then divided into a portion that is to pass through the valve  114   a  and another portion that is to move toward the indoor units C 22  and C 23 . The second-side refrigerant flowing toward the indoor units C 22  and C 23  is divided again into portions, and the portions pass through the valves  1152   a  and  1153   a , respectively, exit from the intermediate unit  1 B, and flow into the radiant indoor heat exchanger  1162  in the indoor unit C 22  and the radiant indoor heat exchanger  1163  in the indoor unit C 23 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1162  and  1163  cool the indoor air, become a higher temperature state, exit from the indoor units C 22  and C 23 , respectively, and flow into the intermediate unit  1 B again. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1152   c  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1153   c  merge with the second-side refrigerant passing through the valve  114   a , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. 
     The high-temperature second-side refrigerant ejected by driving of the pump  109   b  passes through the valve  1121   b , exits from the intermediate unit  1 B, and flows into the convective indoor heat exchanger  1081  in the convective indoor unit C 11 . The second-side refrigerant flowing to the convective indoor heat exchanger  1081  heats the indoor air, becomes a low-temperature state, exits from the convective indoor unit C 11 , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the convective indoor heat exchanger  1081 , flowing to the intermediate unit  1 B, and passing through the valve  1121   d  is divided into a portion that is to pass through the valve  114   b  and another portion that is to move toward the indoor unit C 21 . The second-side refrigerant flowing toward the indoor unit C 21  passes through the valve  1151   b , exits from the intermediate unit  1 B, and flows into the radiant indoor heat exchanger  1161  in the indoor unit C 21 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1161  cools the indoor air, becomes a higher temperature state, exits from the indoor unit C 21 , and flows into the intermediate unit  1 B again. The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1151   d  merges with the second-side refrigerant passing through the valve  114   b , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Cooling Main Operation Mode 2) 
       FIG. 5  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode 2 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . The cooling main operation mode 2 is the operation mode in which the cooling load is larger than the heating load, all of the convective indoor units C 11  to C 13  perform cooling operation, and at least one of the indoor units C 21  to C 23  performs heating operation. The cooling main operation mode 2 is described below with reference to  FIG. 5 . In  FIG. 5 , the convective indoor units C 11  to C 13  and radiant indoor units C 22  and C 23  perform cooling operation, and the radiant indoor unit C 21  performs heating operation. The passage switching in the first-side refrigerant circuit  2  is substantially the same as in the cooling main operation mode 1. The flow of the second-side refrigerant in the second-side refrigerant circuit is described below. 
     In the second-side refrigerant circuit, the valves  1121   a  to  1123   a ,  1121   c  to  1123   c ,  114   a ,  114   b ,  114   d ,  1151   b ,  1151   d ,  1152   a ,  1152   c ,  1153   a , and  1153   c  are in an open state, and the valves  1121   b  to  1123   b ,  1121   d  to  1123   d ,  114   c ,  1151   a ,  1151   c ,  1152   b ,  1152   d ,  1153   b , and  1153   d  are in a closed state. 
     The low-temperature second-side refrigerant ejected by driving of the pump  109   a  is divided into portions, and the portions pass through the valves  1121   a ,  1122   a , and  1123   a , respectively, exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective indoor unit C 11 , the convective indoor heat exchanger  1082  in the convective indoor unit C 12 , and the convective indoor heat exchanger  1083  in the convective indoor unit C 13 , respectively. The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081 ,  1082 , and  1083  cool the indoor air, become a high-temperature state, exit from the convective indoor units C 11 , C 12 , and C 13 , respectively, and flow into the intermediate unit  1 B. 
     The second-side refrigerant passing through the valve  1121   c  and flowing to the intermediate unit  1 B, the second-side refrigerant passing through the valve  1122   c  and flowing to the intermediate unit  1 B, and the second-side refrigerant passing through the valve  1123   c  and flowing to the intermediate unit  1 B are divided into a portion that is to pass through the valve  114   a  and another portion that is to move toward the indoor units C 22  and C 23 . The second-side refrigerant flowing toward the indoor units C 22  and C 23  is further divided into portions, and the portions pass through the valves  1152   a  and  1153   a , respectively, exit from the intermediate unit  1 B, and flow into the radiant indoor heat exchanger  1162  in the indoor unit C 22  and the radiant indoor heat exchanger  1163  in the indoor unit C 23 , respectively. 
     The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1162  and  1163  cool the indoor air, become a higher temperature state, exit from the indoor units C 22  and C 23 , respectively, and flows into the intermediate unit  1 B again. The second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1152   c  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1153   c  merge with the second-side refrigerant passing through the valve  114   a , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. 
     The high-temperature second-side refrigerant ejected by driving of the pump  109   b  passes through the valve  114   d  and is then divided into a portion that is to pass through the valve  114   b  and another portion that is to move toward the indoor unit C 21 . The second-side refrigerant flowing toward the indoor unit C 21  passes through the valve  1151   b , exits from the intermediate unit  1 B, and flows into the radiant indoor heat exchanger  1161  in the indoor unit C 21 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1161  heats the indoor air, becomes a low-temperature state, exits from the indoor unit C 21 , and flows into the intermediate unit  1 B. The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1151   d  merges with the second-side refrigerant passing through the valve  114   b , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Heating Main Operation Mode 1) 
       FIG. 6  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode 1 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . The heating main operation mode 1 is the operation mode in which the heating load is larger than the cooling load and at least one of the convective indoor units C 11  to C 13  performs cooling operation. The heating main operation mode 1 is described below with reference to  FIG. 6 . In  FIG. 6 , the convective indoor units C 11  and C 12  and radiant indoor units C 21  and C 22  perform heating operation, and the convective indoor unit C 13  and radiant indoor unit C 23  perform cooling operation. 
     In the first-side refrigerant circuit  2 , the first flow switching device  106  is switched in advance such that the first-side refrigerant discharged from the compressor  103  flows into the intermediate unit  1 B and the first-side refrigerant exiting from the heat-source-side heat exchanger  104  flows into the compressor  103 . The valves  111   b  and  111   c  are in an open state, and the valves  111   a  and  111   d  to  111   f  are in a closed state. In the second-side refrigerant circuit, the valves  1121   b ,  1121   d ,  1122   b ,  1122   d ,  1123   a ,  1123   c ,  114   a ,  114   b ,  1151   b ,  1151   d ,  1152   b ,  1152   d ,  1153   a , and  1153   c  are in an open state. The valves  1121   a ,  1121   c ,  1122   a ,  1122   c ,  1123   b ,  1123   d ,  114   c ,  114   d ,  1151   a ,  1151   c ,  1152   a ,  1152   c ,  1153   b , and  1153   d  are in a closed state. 
     The first-side refrigerant in the low-temperature and low-pressure gaseous state is compressed by the compressor  103 , becomes a high-temperature and high-pressure state, is discharged, passes through the first flow switching device  106  and check valve  113   c , exits from the outdoor unit  1 A, and flows into the intermediate unit  1 B. The first-side refrigerant in the high-temperature and high-pressure state flowing to the intermediate unit  1 B passes through the valve  111   b , flows into the intermediate heat exchanger  107   b , transfers heat to the first-side refrigerant, and is partially or entirely condensed to a gas-liquid two-phase state or a liquid state. The second-side refrigerant exiting from the intermediate heat exchanger  107   b  is expanded and decompressed by passing through the expansion mechanisms  105   b  and  105   a , becomes a low-temperature and low-pressure gas-liquid two-phase state, and flows into the intermediate heat exchanger  107   a . The first-side refrigerant in the gas-liquid two-phase state flowing to the intermediate heat exchanger  107   a  receives heat from the second-side refrigerant, and partially evaporates. The first-side refrigerant exiting from the intermediate heat exchanger  107   a  passes through the valve  111   c , exits from the intermediate unit  1 B, and flows into the outdoor unit  1 A. The first-side refrigerant flowing to the outdoor unit  1 A passes through the check valve  113   d , flows into the heat-source-side heat exchanger  104 , receives heat from the outdoor air, evaporates, becomes a low-temperature and low-pressure gaseous state, passes through the first flow switching device  106 , is sucked into the compressor  103 , and is compressed again. 
     Next, the flow of the second-side refrigerant in the second-side refrigerant circuit is described. The low-temperature second-side refrigerant ejected by driving of the pump  109   a , passes through the valve  1123   a , then exits from the intermediate unit  1 B, and flows into the convective indoor heat exchanger  1083  in the convective indoor unit C 13 . The second-side refrigerant flowing to the convective indoor heat exchanger  1083  cools the indoor air, becomes a high-temperature state, exits from the convective indoor unit C 13 , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the convective indoor heat exchanger  1083 , flowing to the intermediate unit  1 B, and passing through the valve  1123   c  is divided into a portion that is to pass through the valve  114   a  and another portion that is to move toward the indoor unit C 23 . The second-side refrigerant flowing toward the indoor unit C 23  passes through the valve  1153   a , exits from the intermediate unit  1 B, and flows into the radiant indoor heat exchanger  1163  in the indoor unit C 23 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1163  cools the indoor air, becomes a higher temperature state, exits from the indoor unit C 23 , and flows into the intermediate unit  1 B again. The second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1153   c  merges with the second-side refrigerant passing through the valve  114   a , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. 
     The high-temperature second-side refrigerant ejected by driving of the pump  109   b  is divided into portions, and the portions pass through the valves  1121   b  and  1122   b , respectively, exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective indoor unit C 11  and the convective indoor heat exchanger  1082  in the convective indoor unit C 12 , respectively. The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081  and  1082  heat the indoor air, become a low-temperature state, exit from the convective indoor units C 11  and C 12 , respectively, and flow into the intermediate unit  1 B. The second-side refrigerant exiting from the convective indoor heat exchanger  1081 , flowing to the intermediate unit  1 B, and passing through the valve  1121   d  and the second-side refrigerant exiting from the convective indoor heat exchanger  1082 , flowing to the intermediate unit  1 B, and passing through the valve  1122   d  merge with each other, and the merged second-side refrigerant is divided into a portion that is to pass through the valve  114   b  and another portion that is to move toward the indoor units C 21  and C 22 . The second-side refrigerant flowing toward the indoor units C 21  and C 22  is divided again into portions, and the portions pass through the valves  1151   b  and  1152   b , respectively, exit from the intermediate unit  1 B, and flow into the radiant indoor heat exchanger  1161  in the indoor unit C 21  and the radiant indoor heat exchanger  1162  in the indoor unit C 22 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1161  and  1162  heat the indoor air, become a lower temperature state, exit from the indoor units C 21  and C 22 , respectively, and flow into the intermediate unit  1 B again. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1151   d  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1152   d  merge with the second-side refrigerant passing through the valve  114   b , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Heating Main Operation Mode 2) 
       FIG. 7  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode 2 in the air-conditioning apparatus  1  illustrated in  FIG. 1 . The heating main operation mode 2 is the operation mode in which the heating load is larger than the cooling load, all of the convective indoor units C 11  to C 13  perform heating operation, and at least one of the indoor units C 21  to C 23  perform cooling operation. The heating main operation mode 2 is described below with reference to  FIG. 7 . In  FIG. 7 , the convective indoor units C 11  to C 13  and radiant indoor units C 21  and C 22  perform heating operation, and the radiant indoor unit C 23  performs cooling operation. 
     In the first-side refrigerant circuit  2 , the first flow switching device  106  is switched in advance such that the first-side refrigerant discharged from the compressor  103  flows into the heat-source-side heat exchanger  104  and the first-side refrigerant exiting from the intermediate unit  1 B flows into the compressor  103 . The valves  111   a ,  111   d ,  111   e , and  111   f  are in a closed state, and the valves  111   b  and  111   c  are in an opened state. In the second-side refrigerant circuit, the valves  1121   b  to  1123   b ,  1121   d  to  1123   d ,  114   a ,  114   b ,  114   c ,  1151   b ,  1151   d ,  1152   b ,  1152   d ,  1153   a , and  1153   c  are in an open state, and the valves  1121   a  to  1123   a ,  1121   c  to  1123   c ,  114   d ,  1151   a ,  1151   c ,  1152   a ,  1152   c ,  1153   b , and  1153   d  are in a closed state. 
     The refrigerant flow in the first-side refrigerant circuit  2  is substantially the same as in the heating main operation mode 1, and the description thereof is omitted. The flow of the second-side refrigerant in the second-side refrigerant circuit is only described. The low-temperature second-side refrigerant ejected by driving of the pump  109   a  passes through the valve  114   c  and is divided into a portion that is to pass through the valve  114   a  and another portion that is to move toward the indoor unit C 23 . The second-side refrigerant flowing toward the indoor unit C 23  passes through the valve  1153   a , exits from the intermediate unit  1 B, and flows into the radiant indoor heat exchanger  1163  in the indoor unit C 23 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1163  cools the indoor air, becomes a high-temperature state, exits from the indoor unit C 23 , and flows into the intermediate unit  1 B. The second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1153   c  merge with the second-side refrigerant passing through the valve  114   a , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a.    
     The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. The high-temperature second-side refrigerant ejected by driving of the pump  109   b  is divided into portions, and the portions pass through the valves  1121   b ,  1122   b , and  1123   b , respectively, exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective indoor unit C 11 , the convective indoor heat exchanger  1082  in the convective indoor unit C 12 , and the convective indoor heat exchanger  1083  in the convective indoor unit C 13 , respectively. The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081 ,  1082 , and  1083  heat the indoor air, become a low-temperature state, exit from the convective indoor units C 11 , C 12 , and C 13 , respectively, and flow into the intermediate unit  1 B. 
     The following flow of the second-side refrigerant merge together: the second-side refrigerant exiting from the convective indoor heat exchanger  1081 , flowing to the intermediate unit  1 B, and passing through the valve  1121   d ; the second-side refrigerant exiting from the convective indoor heat exchanger  1082 , flowing to the intermediate unit  1 B, and passing through the valve  1122   d ; and the second-side refrigerant exiting from the convective indoor heat exchanger  1083 , flowing to the intermediate unit  1 B, and passing through the valve  1123   d . The merged second-side refrigerant is divided into a portion that is to pass through the valve  114   b  and another portion that is to move toward the indoor units C 21  and C 22 . The second-side refrigerant flowing toward the indoor units C 21  and C 22  is divided again into portions, and the portions pass through the valves  1151   b  and  1152   b , exit from the intermediate unit  1 B, and flow into the radiant indoor heat exchanger  1161  in the indoor unit C 21  and the radiant indoor heat exchanger  1162  in the indoor unit C 22 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1161  and  1162  heat the indoor air, become a lower temperature state, exit from the indoor units C 21  and C 22 , respectively, and flow into the intermediate unit  1 B again. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1151   d  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1152   d  merge with the second-side refrigerant passing through the valve  114   b , and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Advantages in Embodiment 1) 
     According to Embodiment 1 described above, the number of the convective indoor units C 1   n  including the convective indoor heat exchangers  108   n  and the number of the radiant indoor units C 2   m  including the radiant indoor heat exchangers  116   m  may be any number, and cooling and heating in each of the indoor units C may be freely set. Thus air-conditioning that can rise fast and that can withstand large heating and cooling loads can be performed in rooms equipped with the convective indoor units C 1   n , and uniform air-conditioning can be performed in rooms equipped with the radiant indoor units C 2   m  without causing noise or draft. Accordingly, high-quality air-conditioning can be performed in all of the rooms as the entire structure in accordance with the use and load of each of the rooms. 
     The use of a single air-conditioning system including the convective indoor units C 1   n  including the convective heat exchangers  108   n  and the radiant indoor units C 2   m  including the radiant indoor heat exchangers  116   m  can achieve space and energy savings larger than those in a case where both a convective air-conditioning system and a radiant air-conditioning system are installed. 
     The radiant indoor heat exchangers  116   m  are disposed downflow of the convective indoor heat exchangers  108   n  in the second-side refrigerant circuit. Thus in cooling only operation mode and cooling main operation mode 1, for example, after the second-side refrigerant of 5 degrees C. is supplied to the convective indoor heat exchangers  108   n  and its temperature is raised to 15 degrees C. by heat exchange in the convective indoor heat exchangers  108   n , the second-side refrigerant is supplied to the radiant indoor heat exchangers  116   m.    
     Therefore the second-side refrigerant supplied to the radiant indoor heat exchangers  116   m  after heat exchange in the convective indoor heat exchangers  108   n  has a temperature higher than that supplied to the convective indoor heat exchangers  108   n . Accordingly, both the convective indoor heat exchangers  108   n  and radiant indoor heat exchangers  116   m  can perform appropriate air-conditioning. That is, if the refrigerant supplied to the convective heat exchangers  108   n  and the refrigerant supplied to the radiant indoor heat exchangers  116   m  have the same temperature, a problem arises in that the capacity of the convective heat exchangers  108   n  is insufficient or the capacity of the radiant indoor heat exchangers  116   m  is excessive. In contrast, when the radiant indoor heat exchangers  116   m  are disposed downflow of the convective indoor heat exchangers  108   n , both the convective indoor heat exchangers  108   n  and the radiant indoor heat exchangers  116   m  can perform appropriate air-conditioning. 
     In particular, in cooling operation, if the refrigerant with too low temperature is supplied to the radiant indoor heat exchangers  116   m , a problem arises in that condensation occurs. When the second-side refrigerant supplied to the radiant indoor heat exchangers  116   m  has a temperature higher than that supplied to the convective indoor heat exchangers  108   n , the occurrence of condensation in the radiant indoor heat exchangers  116   m  can be prevented. 
     Similarly, in heating only operation mode and heating main operation mode, the second-side refrigerant supplied to the radiant indoor heat exchangers  116   m  after heat exchange in the convective indoor heat exchangers  108   n  has a temperature lower than that supplied to the convective indoor heat exchangers  108   n . For example, the second-side refrigerant of 45 degrees C. is supplied to the convective indoor heat exchangers  108   n , its temperature is reduced to 130 degrees C. by heat exchange in the convective indoor heat exchangers  108   n , and then the second-side refrigerant is supplied to the radiant indoor heat exchangers  116   m . Accordingly, both the convective indoor heat exchangers  108   n  and the radiant indoor heat exchangers  116   m  can perform appropriate air-conditioning. 
     In the cooling main operation mode 2, because the valve  114   b  is in an open state and the convective indoor heat exchangers  108   n  do not perform heating, the temperature of the second-side refrigerant produced in the intermediate heat exchanger  107   b  can be slightly decreased, an input of the compressor can be reduced, and the operation efficiency is enhanced. Similarly, in heating main operation mode 2, because the valve  114   a  is in an open state and the convective indoor heat exchangers  108   n  do not perform cooling, the temperature of the second-side refrigerant produced in the intermediate heat exchanger  107   a  can be slightly increased, an input of the compressor can be reduced, and the operation efficiency can be enhanced. 
     Embodiment 2 
       FIGS. 8 to 11  are refrigerant circuit diagrams that illustrate Embodiment 2 of the air-conditioning apparatus of the present invention. An air-conditioning apparatus  100  is described with reference to  FIG. 8 . The same reference numerals are used in the components having the same configurations in the air-conditioning apparatus  100  in  FIG. 8  as in the air-conditioning apparatus  1  in  FIG. 1 , and the description thereof is omitted. The air-conditioning apparatus  100  in  FIG. 8  differs from the air-conditioning apparatus  1  in  FIG. 1  in the configurations of the intermediate unit and indoor units. 
     (Configuration of Intermediate Unit  100 B) 
     First, the intermediate unit  100 B in  FIG. 8  is described. The second-side refrigerant circuit in the intermediate unit  100 B includes at least the intermediate heat exchangers  107   a  and  107   b , convective indoor heat exchangers  108   n , radiant indoor heat exchangers  116   n , pumps  109   a  and  109   b , and valves  112   na  to  112   nd . The second-side refrigerant circuit is configured as the refrigerant circuit by connecting mainly the pumps  109   a  and  109   b , convective indoor heat exchangers  108   n , radiant indoor heat exchangers  116   n , intermediate heat exchangers  107   a  and  107   b , and pumps  109   a  and  109   b  in this order by the refrigerant pipes. 
     As in the case of Embodiment 1, the intermediate unit  100 B is disposed on a location or the like different from the outdoor space and indoor space as a housing different from the outdoor unit  1 A and indoor units C and connects the outdoor unit  1 A and indoor units C 3   n  through the refrigerant pipes. The intermediate unit  1 B includes the intermediate heat exchangers  107   a  and  107   b , expansion mechanisms  105   a  and  105   b , pumps  109   a  and  109   b , and valves  111   a  to  111   f  and  112   na  to  112   nd . In the second-side refrigerant circuit, the intermediate heat exchanger  107   a  is disposed between the refrigerant pipe with which the valve  112   nc  merges and the pump  109   a , and the intermediate heat exchanger  107   b  is disposed between the refrigerant pipe with which the valve  112   nd  merges and the pump  109   b.    
     (Configuration of Indoor Unit C 3   n ) 
     Each of the convective and radiant indoor units C 3   n  performs air-conditioning by cooling operation or heating operation on an indoor space and includes the convective heat exchanger  108   n , blower device  108   na , and radiant indoor heat exchanger  116   n . The valves  112   na  and  112   nb  in the intermediate unit  1006  are connected to the inlet side of the convective heat exchanger  108   n  in the indoor unit C 3   n . The discharge side of the convective heat exchanger  108   n  is connected to the inlet side of the radiant indoor heat exchanger  116   n . The radiant indoor heat exchanger  116   n  is disposed downflow of the convective heat exchanger  108   n  and connected in series. The discharge side of the radiant indoor heat exchanger  116   n  is connected to the valves  112   nc  and  112   nd  in the intermediate unit  1006 . The indoor air or outside air supplied from the blower device  108   na  exchanges heat with the second-side refrigerant in the indoor heat exchanger  108   n , and then it exchanges heat again with the second-side refrigerant in the radiant indoor heat exchanger  116   n . In  FIG. 8 , the number n of the convective and radiant indoor units C 3   n  connected is three. The number n is not limited to three, and any number of the convective and radiant indoor units C 3   n  may be used. 
       FIGS. 9 to 14  are refrigerant circuit diagrams that illustrate example streams of the first-side refrigerant and the second-side refrigerant in operation modes. Example operations in the air-conditioning apparatus  100  in each operation mode are described with reference to  FIGS. 9 to 14 . The flow of the first-side refrigerant is substantially the same as in Embodiment 1 described above (see  FIGS. 2 to 7 ), and the flow of the second-side refrigerant is only described below. 
     (Cooling Only Operation Mode) 
       FIG. 9  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and second-side refrigerant in cooling only operation mode in the air-conditioning apparatus  100  illustrated in  FIG. 8 . In  FIG. 9 , the pipes indicated by the thick lines represent the pipes through which the first-side refrigerant and second-side refrigerant pass, the directions in which the first-side refrigerant flows are indicated by the solid line arrows, and the directions in which the second-side refrigerant flows are indicated by the broken line arrows. The same applies to  FIGS. 10 to 12 . The cooling only operation mode is described below with reference to  FIG. 9 . 
     The flow of the second-side refrigerant in the second-side refrigerant circuit is described here. In the second-side refrigerant circuit, the valves  112   na  to  112   nd  are set in an open state in advance. The low-temperature second-side refrigerant ejected by driving of the pump  109   a  is divided into portions, and the portions pass through the valves  1121   a ,  1122   a , and  1123   a , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective and radiant indoor unit C 31 , the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 32 , and the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 , respectively. The low-temperature second-side refrigerant ejected by driving of the pump  109   b  is divided into portions, and the portions pass through the valves  1121   b ,  1122   b , and  1123   b , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective and radiant indoor unit C 31 , the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 2 , and the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 , respectively. 
     The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081 ,  1082 , and  1083  cool the indoor air or outside air, become a high-temperature state, and flow into the radiant indoor heat exchangers  1161 ,  1162 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1161 ,  1162 , and  1163  cool the air subjected to heat treatment in the convective indoor heat exchangers  1081 ,  1082 , and  1083 , respectively, and indoor air, become a higher temperature state, exit from the convective and radiant indoor units C 31 , C 32 , and C 33 , respectively, and flow into the intermediate unit  1 B. 
     A portion of the second-side refrigerant that passes through the valve  1121   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1161  and flowing to the intermediate unit  1 B, a portion of the second-side refrigerant that passes through the valve  1122   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1162  and flowing to the intermediate unit  1 B, and a portion of the second-side refrigerant that passes through the valve  1123   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1163  and flowing to the intermediate unit  1 B merge together, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . Another portion of the second-side refrigerant that passes through the valve  1121   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1161  and flowing to the intermediate unit  1 B, another portion of the second-side refrigerant that passes through the valve  1122   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1162  and flowing to the intermediate unit  1 B, and another portion of the second-side refrigerant that passes through the valve  1123   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1163  and flowing to the intermediate unit  1 B merge together, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b.    
     The flows of the second-side refrigerant flowing to the intermediate heat exchangers  107   a  and  107   b  are cooled by the first-side refrigerant in the low-temperature state and exit from the intermediate heat exchangers  107   a  and  107   b , respectively. The flows of the second-side refrigerant exiting from the intermediate heat exchangers  107   a  and  107   b  flow into the pumps  109   a  and  109   b , respectively, and are ejected again. 
     (Heating Only Operation Mode) 
       FIG. 10  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and second-side refrigerant in heating only operation mode in the air-conditioning apparatus  100  illustrated in  FIG. 8 . The heating only operation mode is described below with reference to  FIG. 10 . The flow of the second-side refrigerant in the second-side refrigerant circuit is described here. The flow of the second-side refrigerant is substantially the same as in cooling only operation mode. In the second-side refrigerant circuit, the valves  112   na  to  112   nd  are set in an open state in advance. 
     The high-temperature second-side refrigerant ejected by driving of the pump  109   a  is divided into portions, and the portions pass through the valves  112   na ,  1122   a , and  1123   a , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective and radiant indoor unit C 31 , the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 32 , and the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 , respectively. The high-temperature second-side refrigerant ejected by driving of the pump  109   b  is divided into portions, and the portions pass through the valves  1121   b ,  1122   b , and  1123   b , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective indoor unit C 1 , the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 32 , and the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 , respectively. 
     The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081 ,  1082 , and  1083  heat the indoor air or outside air, become a low-temperature state, and flow into the radiant indoor heat exchangers  1161 ,  1162 , and  1163 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1161 ,  1162 , and  1163  heat the air subjected to heat treatment in the convective indoor heat exchangers  1081 ,  1082 , and  1083 , respectively, and indoor air, become a lower temperature state, exit from the convective and radiant indoor units C 31 , C 32 , and C 33 , respectively, and flow into the intermediate unit  1 B. 
     A portion of the second-side refrigerant that passes through the valve  1121   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1161  and flowing to the intermediate unit  1 B, a portion of the second-side refrigerant that passes through the valve  1122   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1162  and flowing to the intermediate unit  1 B, and a portion of the second-side refrigerant that passes through the valve  1123   c  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1163  and flowing to the intermediate unit  1 B merge together, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . Another portion of the second-side refrigerant that passes through the valve  1121   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1161  and flowing to the intermediate unit  1 B, another portion of the second-side refrigerant that passes through the valve  1122   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1162  and flowing to the intermediate unit  1 B, and another portion of the second-side refrigerant that passes through the valve  1123   d  after being divided from the second-side refrigerant exiting from the radiant indoor heat exchanger  1163  and flowing to the intermediate unit  1 B merge together, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b.    
     The flows of the second-side refrigerant flowing to the intermediate heat exchangers  107   a  and  107   b  are heated by the first-side refrigerant in the high-temperature state and exit from the intermediate heat exchangers  107   a  and  107   b , respectively. The flows of the second-side refrigerant exiting from the intermediate heat exchangers  107   a  and  107   b  flow into the pumps  109   a  and  109   b , respectively, and are ejected again. 
     (Cooling Main Operation Mode) 
       FIG. 11  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in cooling main operation mode in the air-conditioning apparatus  100  illustrated in  FIG. 8 . The cooling main operation mode is described below with reference to  FIG. 11 . In  FIG. 11 , the convective and radiant indoor unit C 31  performs heating operation, and the convective and radiant indoor units C 32  and C 33  perform cooling operation. 
     The flow of the second-side refrigerant in the second-side refrigerant circuit is described here. In the second-side refrigerant circuit, the valves  1121   b ,  1121   d ,  1122   a ,  1122   c ,  1123   a , and  1123   c  are set in an open state in advance, and the valves  1121   a ,  1121   c ,  1122   b ,  1122   d ,  1123   b , and  1123   d  are set in a closed state in advance. 
     The low-temperature second-side refrigerant ejected by driving of the pump  109   a  is divided into portions, and the portions pass through the valves  1122   a  and  1123   a , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 32  and the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 , respectively. 
     The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1082  and  1083  cool the indoor air or outside air, become a high-temperature state, and flow into the radiant indoor heat exchangers  1162  and  1163 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1162  and  1163  cool the air subjected to heat treatment in convective indoor heat exchangers  1082  and  1083 , respectively, and indoor air, become a higher temperature state, exit from the convective and radiant indoor units C 32  and C 33 , respectively, and flow into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1122   c  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1123   c  merge with each other, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   a . The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. The high-temperature second-side refrigerant ejected by driving of the pump  109   b  passes through the valve  1121   b , then exits from the intermediate unit  1 B, and flows into the convective indoor heat exchanger  1081  in the convective and radiant indoor unit C 31 . 
     The second-side refrigerant flowing to the convective indoor heat exchanger  1081  heats the indoor air, becomes a low-temperature state, and flows into the radiant indoor heat exchanger  1161 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1161  heats the air subjected to heat treatment in the convective indoor heat exchanger  1081  and indoor air, becomes a lower temperature state, exits from the convective and radiant indoor unit C 31 , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1121   d  flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Heating Main Operation Mode) 
       FIG. 12  is a refrigerant circuit diagram that illustrates the streams of the first-side refrigerant and the second-side refrigerant in heating main operation mode in the air-conditioning apparatus  100  illustrated in  FIG. 8 . The heating main operation mode is described below with reference to  FIG. 12 . In  FIG. 12 , the convective and radiant indoor units C 31  and C 32  perform heating operation, and the convective and radiant indoor unit C 33  performs cooling operation. 
     The flow of the second-side refrigerant in the second-side refrigerant circuit is described here. In the second-side refrigerant circuit, the valves  1121   b ,  1121   d ,  1122   b ,  1122   d ,  1123   a , and  1123   c  are set in an open state in advance, and the valves  1121   a ,  1121   c ,  1122   a ,  1122   c ,  1123   b , and  1123   d  are set in a closed state in advance. 
     The low-temperature second-side refrigerant ejected by driving of the pump  109   a  passes through the valve  1123   a , then exits from the intermediate unit  1 B, and flows into the convective indoor heat exchanger  1083  in the convective and radiant indoor unit C 33 . The second-side refrigerant flowing to the convective indoor heat exchanger  1083  cools the indoor air, becomes a high-temperature state, and flows into the radiant indoor heat exchanger  1163 . The second-side refrigerant flowing to the radiant indoor heat exchanger  1163  heats the air subjected to heat treatment in the convective indoor heat exchanger  1083  and indoor air, becomes a higher temperature state, exits from the convective and radiant indoor unit C 31 , and flows into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1163 , flowing to the intermediate unit  1 B, and passing through the valve  1123   c  flows into the intermediate heat exchanger  107   a . The second-side refrigerant flowing to the intermediate heat exchanger  107   a  is cooled by the first-side refrigerant in the low-temperature state and exits from the intermediate heat exchanger  107   a . The second-side refrigerant exiting from the intermediate heat exchanger  107   a  flows into the pump  109   a  and is ejected again. The high-temperature second-side refrigerant ejected by driving of the pump  109   b  is divided into portions, and the portions pass through the valves  1121   b  and  1122   b , respectively, then exit from the intermediate unit  1 B, and flow into the convective indoor heat exchanger  1081  in the convective and radiant indoor unit C 31  and the convective indoor heat exchanger  1082  in the convective and radiant indoor unit C 32 , respectively. 
     The flows of the second-side refrigerant flowing to the convective indoor heat exchangers  1081  and  1082  heat the indoor air or outside air, become a low-temperature state, and flow into the radiant indoor heat exchangers  1161  and  1162 , respectively. The flows of the second-side refrigerant flowing to the radiant indoor heat exchangers  1161  and  1162  heat the air subjected to heat treatment in convective indoor heat exchanger  1083  and indoor air, become a lower temperature state, exit from the convective and radiant indoor units C 31  and C 32 , respectively, and flow into the intermediate unit  1 B. 
     The second-side refrigerant exiting from the radiant indoor heat exchanger  1161 , flowing to the intermediate unit  1 B, and passing through the valve  1121   d  and the second-side refrigerant exiting from the radiant indoor heat exchanger  1162 , flowing to the intermediate unit  1 B, and passing through the valve  1122   d  merge with each other, and the merged second-side refrigerant flows into the intermediate heat exchanger  107   b . The second-side refrigerant flowing to the intermediate heat exchanger  107   b  is heated by the first-side refrigerant in the high-temperature state and exits from the intermediate heat exchanger  107   b . The second-side refrigerant exiting from the intermediate heat exchanger  107   b  flows into the pump  109   b  and is ejected again. 
     (Advantages in Embodiment 2) 
     According to Embodiment 2 described above, because the indoor unit includes both the convective indoor heat exchanger  108   n  and the radiant indoor heat exchanger  116   n , the air-conditioning apparatus can perform air-conditioning that supports a large thermal load and that causes no or slight discomfort provided by noise or draft. In particular, in cooling operation, making the temperature of air with a humidity reduced by being cooled by the convective indoor heat exchanger  108   n  appropriate by the radiant indoor heat exchanger  116   n  and blowing that air into the room enables handling not only a sensible heat load but also a latent heat load. The refrigerant pipes can be reduced with respect to the heat exchange capacity and the cost can be reduced, in comparison with Embodiment 1. 
     (Examples of Placement of Indoor Unit in Embodiment 2) 
       FIGS. 13 to 15  illustrate examples of placement of the convective and radiant indoor unit C 3   n  in the air-conditioning apparatus  100  according to Embodiment 2. In  FIG. 13 , the convective indoor heat exchanger  108  and the radiant indoor heat exchanger  116  are connected to the intermediate unit  1 B by the second-side refrigerant pipe. The broken line arrows indicate the directions in which the second-side refrigerant flows. The second-side refrigerant exiting from the intermediate unit  1 B runs through the convective indoor heat exchanger  108   n  and the radiant indoor heat exchanger  116   n  in this order and flows into the intermediate unit  1 B. 
     In the example placement illustrated in  FIG. 13 , indoor air  1   a  is sucked by the blower device  108   a , exchanges heat in the convective heat exchanger  108   n , then exchanges heat in the radiant indoor heat exchanger  116   n , and air-conditioning is thus performed. In the example placement illustrated in  FIG. 14 , outside air  1   b  is sucked by the blower device  108   a , exchanges heat in the convective heat exchanger, then exchanges heat in the radiant indoor heat exchanger  116   m , and ventilation and air-conditioning are thus performed. In the example placement illustrated in  FIG. 15 , the indoor air  1   a  and outside air  1   b  are sucked by the blower device  108   a , exchanges heat in the convective heat exchanger, then exchanges heat in the radiant indoor heat exchanger  116 , and ventilation and air-conditioning are thus performed. The ratio between the indoor air and the outside air may be adjusted depending on the temperature of the outside air or the quality of the indoor air. With this manner, the sensible heat cooling capacity can be improved, and the occurrence of condensation in the radiant indoor heat exchanger  116   n  can be prevented. 
     Embodiment 3 
       FIG. 16  is a refrigerant circuit diagram that illustrates Embodiment 3 of the air-conditioning apparatus of the present invention. An air-conditioning apparatus  200  is described with reference to  FIG. 16 . The same reference numerals are used in the components having the same configurations in the air-conditioning apparatus  200  in  FIG. 16  as in the air-conditioning apparatuses  1  and  100  in  FIGS. 1 and 8 , and the description thereof is omitted. The air-conditioning apparatus  200  in  FIG. 16  differs from the air-conditioning apparatuses  1  and  100  in  FIGS. 1 and 8  in that three different types of the convective indoor units C 1 , C 2 , and C 3  are connected to the intermediate unit  1 B. 
     Specifically, the air-conditioning apparatus  200  includes the convective and radiant indoor unit C 31  including both the convective indoor heat exchanger  1081  and a radiant indoor heat exchanger  1164 , the convective indoor units C 12  and C 13  including only the convective indoor heat exchangers  1081  and  1082 , respectively, as a heat exchanger, and indoor units C 21  to C 23  including only the radiant indoor heat exchangers  116   m , respectively, as a heat exchanger. The configuration of each element and the streams of the refrigerants in operation modes are similar to those in Embodiments 1 and 2. According to Embodiment 3 described above, because the single air-conditioning apparatus  200  can install three types of indoor units, air-conditioning can be performed in accordance with the use and load of each room, while at the same time space and energy savings are achieved. 
     Embodiments in the present invention are not limited to Embodiments 1 to 3 described above. Embodiments described above illustrate an example case where the two intermediate heat exchangers  107   a  and  107   b  are disposed inside the intermediate unit  1 B. Two or more intermediate heat exchangers may also be used. 
     The examples illustrated in  FIGS. 13 to 15  are not limited to the illustrated ones. The radiant indoor heat exchangers may be of the so-called active chilled beam type or passive chilled beam type. 
     REFERENCE SIGNS LIST 
       1 ,  100 ,  200  air-conditioning apparatus  1 A outdoor unit  1 B,  100 B intermediate unit  2  first-side refrigerant circuit  3  second-side refrigerant circuit  103  compressor  104  heat-source-side heat exchanger  104   a  fan  105   a ,  105   b  expansion mechanism  106  first flow switching device  107   a ,  107   b  intermediate heat exchanger  108   n  convective indoor heat exchanger  108   na  blower device  109   a ,  109   b  pump  111   a - 111   f  valve (flow switching device)  112   na  valve  112   nb  valve  112   nc  valve  112   nd  valve  113   a - 113   d  check valve  115   ma  valve  115   mb  valve  115   mc  valve  115   md  valve  116  radiant indoor heat exchanger  116   n  radiant indoor heat exchanger C 1   n  convective indoor unit C 2   m  radiant indoor unit C 3  convective and radiant indoor unit.