Patent Publication Number: US-2020281152-A1

Title: Livestock stall system

Description:
TECHNICAL FIELD 
     The present invention relates to a livestock stall system. 
     BACKGROUND ART 
     A livestock stall system is required to maintain a favorable livestock raising environment. For example, a poultry farming system needs to take measures against the cold of winter and the heat of summer to maintain a favorable chicken raising environment. In particular, since newborn chicks are fragile, the newborn chicks need to be kept in a high-temperature close to body temperature and calm environment. 
     Examples of a method of heating the livestock stall can include hot air heating and brooder heating. The hot air heating is undesirable because irradiating the chicks with wind will take the body temperature away from the chicks. In addition, the brooder heating is undesirable because it uses fossil fuels and generates carbon dioxide, which leads to global environmental degradation. In addition, in a gas brooder method used for heating, since local heating is applied, the temperature of the litter (bedding) becomes uneven, and the condition of the litter (bedding) deteriorates. In addition, exhaust gas, soot, and the like also have an effect on ecology, and it is difficult to make the whole stall a suitable environment. 
     In addition, examples of a method of cooling the livestock stall can include, for example, a method of increasing or decreasing the amount of ventilation with a ventilation fan attached to the livestock stall according to the outside air temperature or the temperature inside the livestock stall, a method of spraying mist in the stall and cooling the stall by heat of vaporization, a method of directly sprinkling water on the livestock when the temperature is extremely high, or the like. In the case of spraying the mist, when the humidity is high, it is not possible to use the heat of vaporization and it is difficult to appropriately cool the stall. Further, in the case of directly sprinkling the water on the livestock, since the litter (bedding) gets wet, the condition of the litter (bedding) deteriorates. 
     On the other hand, Patent Literature 1 below discloses breeding chicks by floor heating. The floor heating is a method of burying a pipe under the floor of the livestock stall and circulating a heating medium inside the pipe to warm a floor surface. According to such floor heating, since the chicks are not irradiated with the wind and it is not necessary to further use the fossil fuels, the chickens can be suitably bred. The floor heating is favorable for such heating, but in a case of lowering the temperature in the livestock stall, there is an only method of naturally cooling the livestock stall and there is a poor response to an ever-changing external environment. In addition, the floor heating can heat the entire floor, but in the case of lowering the temperature, there is an only method of naturally cooling the floor and it is difficult to adjust to a suitable temperature. 
     CITATION LIST 
     Patent Literatures 
     Patent Literature 1: WO2003/007928 
     SUMMARY OF INVENTION 
     Technical Problem 
     From the above, in the livestock stall system, it is necessary to take measures against the cold of winter and the heat of summer while maintaining the inside of the livestock stall in a favorable environment and preventing the deterioration of the condition of the litter (bedding). Further, since the environment inside the livestock stall also greatly fluctuates when a temperature difference during the day is large, the impact on the livestock is large and there is a need for a comfortable livestock stall not only in winter and summer but also throughout the year. 
     The present invention has been invented to solve the above problems, and is to provide a livestock stall system that can take measures against cold of winter and heat of summer while maintaining the inside of the livestock stall in a favorable environment and preventing the deterioration of the condition of the litter (bedding). 
     Solution to Problem 
     A livestock stall system according to the present invention includes a livestock stall in which livestock is bred, and a pipe that is arranged so as to pass under the livestock stall and adjusts a temperature of a floor surface of the livestock stall by a medium that circulates the inside thereof. 
     Advantageous Effects of Invention 
     According to the livestock stall system configured as described above, the temperature of the floor surface of the livestock stall is adjusted by the medium that circulates through the inside of the pipe. For this reason, floor heating and floor cooling can be appropriately adopted. For this reason, it is possible to take measures against the cold of winter and the heat of summer, while maintaining the livestock stall in a favorable environment and preventing the deterioration of the litter (bedding). Further, it is possible to provide a comfortable livestock stall not only in winter and summer, but also throughout the year. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a systematic diagram showing a poultry farming system according to a first embodiment. 
         FIG. 2  is a systematic diagram showing a heat pump of the poultry farming system according to the first embodiment. 
         FIG. 3  is a systematic diagram showing a portion of a heating unit of the poultry farming system according to the first embodiment. 
         FIG. 4  is a systematic diagram showing a poultry farming system according to a second embodiment and is a diagram showing a state when floor heating is performed. 
         FIG. 5  is the systematic diagram showing the poultry farming system according to the second embodiment and is a diagram showing a state when floor cooling is performed. 
         FIG. 6  is the systematic diagram showing the poultry farming system according to the second embodiment and is a diagram showing a state in which a first medium and a second medium are mixed to bring a floor surface of a poultry house to a predetermined temperature. 
         FIG. 7  is a systematic diagram showing a portion of a heating unit of a poultry farming system according to Modified Example 1. 
         FIG. 8  is a schematic systematic diagram showing a poultry farming system according to Modified Example 2. 
         FIG. 9  is a schematic systematic diagram showing a portion of a poultry farming system according to Modified Example 3. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
     A first embodiment of the present invention will be described with reference to  FIGS. 1 to 3 . Note that in the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. The dimensional ratios in the drawings are exaggerated for the sake of explanation and may differ from the actual ratios. 
     In the present embodiment, as a livestock stall system, a poultry farming system for breeding chickens will be described as an example. 
       FIG. 1  is a systematic diagram showing a poultry farming system (livestock stall system)  1  according to a first embodiment.  FIG. 2  is a systematic diagram showing a heat pump  20  of the poultry farming system  1  according to the first embodiment.  FIG. 3  is a systematic diagram showing a portion of the heating unit  30  of the poultry farming system  1  according to the first embodiment and is a diagram when viewed from above. In  FIG. 3 , the heating unit  30  is shown by a solid line for easy understanding. 
     As shown in  FIG. 1 , the poultry farming system  1  includes a poultry house  10  in which chickens are bred, a heat pump  20  capable of simultaneously taking out cold and hot heat, a heating unit  30  for heating the inside of the poultry house  10 , a cooling unit  40  for cooling the inside of the poultry house  10 , an adjusting unit  50  for adjusting temperature and humidity in the poultry house  10 , an exhaust fan  60  for exhausting air in the poultry house  10 , and a sterilizer  70  for sterilizing the inside of the poultry house  10 . 
     As shown in  FIG. 1 , the poultry house  10  includes a floor surface  11 , a left side wall  12 , and a right side wall  13 . On the floor surface  11 , for example, a litter (bedding) is arranged, on which chicks or chickens are bred. Below a floor of the floor surface  11 , a second pipe  33  described later is arranged. 
     The adjusting unit  50  is attached to the left side wall  12 . In addition, the exhaust fan  60  is attached to the right side wall  13 . 
     The heat pump  20  is configured to be able to simultaneously take out cold and hot heat. In addition, the heat pump  20 , together with a heating tank  32  and a cooling tank  42  described later, is also configured to be able to take out only hot or cold heat. Since the heat pump  20  is an electric type, the heat pump  20  does not use fire and thus there is no need to worry about fire. Hereinafter, a configuration of the heat pump  20  will be described in detail with reference to  FIG. 2 . 
     As shown in  FIG. 2 , the heat pump  20  includes a refrigerant flow passage  21  through which a refrigerant circulates, a compressor  22  for compressing the refrigerant, an expansion valve  23  for expanding the refrigerant, a hot heat exchanger  24  for supplying hot heat to a first medium (corresponding to a medium) circulating in the heating unit  30 , and a cold heat exchanger  25  for supplying cold heat to a second medium circulating in the cooling unit  40 . Note that the refrigerant circulating in the refrigerant flow passage  21  is not particularly limited, but for example, carbon dioxide can be used. 
     The compressor  22  is provided in the refrigerant flow passage  21 . The compressor  22  is not particularly limited, but for example, a CO 2  compressor can be used. By being compressed when the refrigerant passes through the compressor  22 , the compressor  22  increases a temperature of the refrigerant. 
     The expansion valve  23  is provided in the refrigerant flow passage  21 . By being expanded when the refrigerant passes through the expansion valve  23 , the expansion valve  23  lowers the temperature of the refrigerant. 
     The hot heat exchanger  24  is arranged between the compressor  22  and the expansion valve  23 . The hot heat exchanger  24  heats the first medium circulating in the heating unit  30  by a high-temperature refrigerant circulating from the compressor  22  toward the expansion valve  23 . Here, the temperature of the first medium heated by the hot heat exchanger  24  can be, for example, 65° C. or 90° C. 
     The cold heat exchanger  25  is arranged between the expansion valve  23  and the compressor  22 . The cold heat exchanger  25  cools the second medium circulating in the cooling unit  40  by a low-temperature refrigerant circulating from the expansion valve  23  toward the compressor  22 . 
     According to the heat pump  20  configured as described above, the hot heat exchanger  24  heats the first medium circulating in the heating unit  30 , and the cold heat exchanger  25  cools the second medium circulating in the cooling unit  40 . Therefore, the heat pump  20  is in a state where hot and cold heat can be simultaneously taken out. 
     Returning to  FIG. 1 , the heating unit  30  heats the inside of the poultry house  10  by the first medium heated by the hot heat taken out of the heat pump  20  circulating through the inside of the heat pump  20 . As shown in  FIGS. 1 and 3 , the heating unit  30  includes a first pipe  31  for receiving the hot heat from the hot heat exchanger  24 , a heating tank  32  in which the first medium that has received the hot heat from the hot heat exchanger  24  is stored, a second pipe (corresponding to a pipe)  33  arranged below the floor of the poultry house  10 , a positioning portion  34  for positioning and fixing the second pipe  33 , a winding portion  35  capable of winding the second pipe  33 , a cleaning portion  36  for cleaning the second pipe  33 , and a third pipe  37  connected to the adjusting unit  50  through a first piping  55 . 
     The circulation of the first medium in the first pipe  31  is performed by a first heating pump P 1 . The circulation of the first medium in the second pipe  33  is performed by a second heating pump P 2 . In addition, the first medium circulating in the first pipe  31 , the second pipe  33 , and the third pipe  37  is not particularly limited, but is, for example, water. 
     The first medium that has received the hot heat from the hot heat exchanger  24  circulates inside the first pipe  31 . Then, the first medium that has received the hot heat from the hot heat exchanger  24  is stored in the heating tank  32 . By storing the first medium in the heating tank  32  in this manner, the first medium can be transferred to the second pipe  33  at a desired timing. 
     The second pipe  33  is branched from the third pipe  37  at a branch portion J 1 . The third pipe  37  is connected to the first piping  55  at a switching valve V 1 . The switching valve V 1  switches on/off of the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 . 
     It is preferable that outer circumferences of the first pipe  31 , the second pipe  33 , and the third pipe  37  have anticorrosion properties. 
     As shown in  FIG. 3 , the positioning portion  34  can position the second pipe  33  such that a position of the second pipe  33  is variable. The positioning portion  34  includes a concave portion (not shown) in which the second pipe  33  is mounted. In the present embodiment, the positioning portion  34  positions the second pipe  33  so that intervals S 1  and S 2  between adjacent second pipes  33  are different from each other, as shown in  FIG. 3 . The positioning portion  34  positions the second pipe  33  so that a distance from the floor surface  11  is constant. The positioning portion  34  also serves as a heat insulating sheet. According to such a configuration, it is possible to save energy of hot heat required for heating the floor surface  11 . 
     By positioning and fixing the second pipe  33  by the positioning portion  34  in this manner, as shown in  FIG. 3 , there are places where the second pipe  33  is arranged and places where the second pipe  33  is not arranged. As a result, a warm place  11 A and a cool place  11 B can be provided on the floor surface  11  of the poultry house  10 . Therefore, the chicken can move by selecting the warm place  11 A or the cool place  11 B by itself. 
     The winding portion  35  can wind the second pipe  33 . The winding portion  35  is a storage drum, and in  FIG. 3 , the winding portion  35  can send out the second pipe  33  from the winding portion  35  by rotating counterclockwise, and collect the second pipe  33  by rotating clockwise. Since the winding portion  35  is provided in this manner, the collection and the laying of the second pipe  33  are easily performed when it is desired to change a poultry farming place. 
     The cleaning portion  36  is provided so as to be adjacent to the winding portion  35 . The cleaning portion  36  is arranged so as to be in contact with the second pipe  33 , and removes and cleans dust attached to the surface of the second pipe  33  when the second pipe  33  is wound around the winding portion  35 . 
     The cooling unit  40  cools the inside of the poultry house  10  as shown in  FIG. 1 . The cooling unit  40  includes a fourth pipe  41  for receiving the cold heat from the cold heat exchanger  25 , a cooling tank  42  in which the second medium that has received the cold heat from the cold heat exchanger  25  is stored, and a fifth pipe  43  connected to the adjusting unit  50  through the second piping  56 . 
     The circulation of the second medium in the fourth pipe  41  is performed by a first cooling pump P 3  as shown in  FIG. 1 . The circulation of the second medium in the fifth pipe  43  is performed by a second cooling pump P 4 . The second medium circulating in the fourth pipe  41  and the fifth pipe  43  is not particularly limited, but is, for example, water. The temperature of the second medium circulating in the fourth pipe  41  and the fifth pipe  43  is, for example, 7 to 10° C. 
     The second medium that has received the cold heat from the cold heat exchanger  25  circulates inside the fourth pipe  41 . Then, the second medium that has received the cold heat from the cold heat exchanger  25  is stored in the cooling tank  42 . By storing the second medium in the cooling tank  42  in this manner, the second medium can be transferred to the fifth pipe  43  at a desired timing. 
     The fifth pipe  43  is connected to a second piping  56  at a switching valve V 2 . The switching valve V 2  switches on/off of the supply of the second medium passing through the fifth pipe  43  to the adjusting unit  50 . 
     It is preferable that outer circumferences of the fourth pipe  41  and the fifth pipe  43  have anticorrosion properties. 
     Since the heating unit  30  and the cooling unit  40  are provided in this manner, only the hot heat can be taken out by turning on the second heating pump P 2  and turning off the second cooling pump P 4 . On the other hand, only the cold heat can be taken out by turning off the second heating pump P 2  and turning on the second cooling pump P 4 . 
     The adjusting unit  50  adjusts the temperature and humidity in the poultry house  10 . The adjusting unit  50  is arranged in the first piping  55  and the second piping  56 . A fan F 1  is arranged next to the adjusting unit  50 . 
     In order for the adjusting unit  50  to heat the inside of the poultry house  10 , the switching valve V 1  turns on the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 , and the switching valve V 2  turns off the supply of the second medium passing through the fifth pipe  43  of the cooling unit  40  to the adjusting unit  50 . 
     In addition, in order for the adjusting unit  50  to cool the inside of the poultry house  10 , the switching valve V 1  turns off the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 , and the switching valve V 2  turns on the supply of the second medium passing through the fifth pipe  43  of the cooling unit  40  to the adjusting unit  50 . 
     In order for the adjusting unit  50  to dehumidify the inside of the poultry house  10 , the switching valve V 1  turns off the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 , and the switching valve V 2  turns on the supply of the second medium passing through the fifth pipe  43  of the cooling unit  40  to the adjusting unit  50 . Dehumidification is performed by cooling air in the vicinity of the adjusting unit  50  by the second medium, removing moisture by changing the moisture into water droplets and condensing the moisture, and discharging dried air. 
     In addition, when the adjusting unit  50  turns off the dehumidification function, the switching valve V 1  turns off the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 , and the switching valve V 2  turns on the supply of the second medium passing through the fifth pipe  43  of the cooling unit  40  to the adjusting unit  50 . 
     The sterilizer  70  is provided in the poultry house  10  and sterilizes the inside of the poultry house  10 . As the sterilizer  70 , for example, an excimer lamp can be used. By using the excimer lamp as the sterilizer  70  in this way, ozone and radicals with good diffusibility can be generated, the sterilization can be made, virus growth can be suppressed, and a deodorant effect on smell and ammonia can be increased. Therefore, it is possible to safely promote the growth of chicks by realizing a comfortable environment. Further, as the sterilizer, a discharge type ozonizer may be used. 
     Next, a method of breeding chickens by the poultry farming system  1  according to the first embodiment will be described. 
     For example, in winter, it is preferable to set the inside of the poultry house  10  to a high temperature environment so as to be able to cope with a sudden drop in the outside air temperature. 
     In winter, only the hot heat can be taken out by turning on the second heating pump P 2  and turning off the second cooling pump P 4 . 
     At this time, the first medium that has received the hot heat from the hot heat exchanger  24  circulates through the inside of the first pipe  31 , and the first medium that has received the hot heat is stored in the heating tank  32 . Then, by turning on the second heating pump P 2 , the second pipe  33  can warm the inside of the poultry house  10  from under the floor of the poultry house  10 . Here, the positioning portion  34  positions the second pipe  33  so that the intervals S 1  and S 2  between the adjacent second pipes  33  are different from each other. For this reason, as shown in  FIG. 3 , a warm place  11 A and a cool place  11 B can be provided on the floor surface  11  of the poultry house  10 . Therefore, the chicken can move by selecting the warm place  11 A or the cool place  11 B by itself. 
     In addition, by turning on the supply of the first medium passing through the third pipe  37  to the adjusting unit  50  at the switching valve V 1 , the adjusting unit  50  can warm the inside of the poultry house  10 . 
     On the other hand, in summer, it is preferable to set the inside of the poultry house  10  to a low temperature environment so as to be able to cope with a sudden rise in the outside air temperature. 
     In summer, only the cold heat can be taken out by turning off the second heating pump P 2  and turning on the second cooling pump P 4 . 
     Thus, the second medium is circulated through the fifth pipe  43  of the cooling unit  40 . Then, the switching valve V 1  turns off the supply of the first medium passing through the third pipe  37  to the adjusting unit  50 , and the switching valve V 2  turns on the supply of the second medium passing through the fifth pipe  43  of the cooling unit  40  to the adjusting unit  50 . As a result, the inside of the poultry house  10  can be cooled by the adjusting unit  50 . 
     Further, in the middle period such as spring or autumn, the above-described summer mode and winter mode are appropriately switched and used according to the temperature of the day. In addition, in the case of a humid climate, such as during a rainy season, it is preferable to turn on the dehumidification function in the adjusting unit  50  to dehumidify the poultry house  10 . 
     Hereinafter, for example, a preferred method of properly using 65° C. and 90° C., which is the temperature of the first medium heated by the hot heat exchanger  24 , will be described. 
     For example, in a general poultry house, after entering the poultry house in the state of a chick, the chicken is shipped as an adult chicken after about 52 days. Thereafter, cleaning, sterilization, and drying are performed in about 14 days, and breeding is thus carried out in one cycle fora total of about 66 days. Therefore, about 5.5 rotations per year are carried out. Here, the so-called empty house period in which cleaning, sterilization, and drying are performed is equivalent to 77 days a year. 
     Here, when the first medium is used for heating the poultry house  10 , it is preferable to use, for example, 65° C. as the temperature of the first medium. On the other hand, when the first medium is used for drying the poultry house  10  during the empty house period, it is preferable to use, for example, 90° C. as the temperature of the first medium. As described above, in the empty house period, by increasing the temperature of the first medium, a drying period can be shortened, and the empty house period can be shortened, for example, by two days. Therefore, it is possible to improve the productivity of the poultry farming system  1 . 
     As described above, the poultry farming system  1  according to the first embodiment includes the poultry house  10  in which the chickens are bred, and the second pipe  33  that is arranged to pass under the floor of the poultry house  10  and adjusts the temperature of the floor surface  11  of the poultry house  10  by the first medium circulating through the inside of the second pipe  33 . According to the poultry farming system  1  configured as described above, the temperature of the floor surface  11  of the poultry house  10  is adjusted by the first medium circulating through the inside of the second pipe  33 . For this reason, it is possible to take measures against cold of winter and measures against heat of summer while maintaining the inside of the poultry house  10  in a suitable environment and preventing deterioration of the condition of the litter (bedding). Further, even when a temperature difference during the day is large, it is possible to suitably adjust the temperature in the poultry house  10 . Therefore, it is possible to provide a comfortable poultry house  10  not only in winter and summer but also throughout the year. 
     In addition, the second pipe  33  is arranged so that a temperature difference occurs on the floor surface  11 . As a result, a warm place  11 A and a cool place  11 B can be provided on the floor surface  11  of the poultry house  10 . Therefore, it is possible to provide the poultry farming system  1  in which the chickens can move to the warm place  11 A or the cool place  11 B by themselves. 
     In addition, the poultry farming system  1  further includes the positioning portion  34  for positioning the second pipe  33  so that the position of the second pipe  33  is variable. According to the poultry farming system  1  configured as described above, the second pipe  33  can be positioned and fixed so that a place where the second pipe  33  is arranged and a place where the second pipe  33  is not arranged are formed under the floor of the poultry house  10 . As a result, the warm place  11 A and the cool place  11 B can be provided on the floor surface  11  of the poultry house  10 . 
     In addition, the second pipe  33  is arranged such that the intervals S 1  and S 2  between the adjacent second pipes  33  are different from each other. According to the poultry farming system  1  configured as described above, it is possible to reliably provide the warm place  11 A and the cool place  11 B on the floor surface  11  of the poultry house  10 . 
     In addition, the poultry farming system  1  further includes the winding portion  35  capable of winding the second pipe  33 . According to the poultry farming system  1  configured as described above, when it is desired to change a poultry farming place, the collection and the laying of the second pipe  33  are easily performed. 
     In addition, the poultry farming system  1  further includes the cleaning portion  36  for cleaning the second pipe  33  when the second pipe  33  is wound around the winding portion  35 . According to the poultry farming system  1  configured as described above, the dust attached to the surface of the second pipe  33  is easily removed and cleaned. 
     Second Embodiment 
     Next, a poultry farming system  2  according to a second embodiment will be described with reference to  FIGS. 4 to 6 .  FIG. 4  is a systematic diagram showing a poultry farming system  2  according to a second embodiment and is a diagram showing a state when floor heating is performed.  FIG. 5  is the systematic diagram showing the poultry farming system  2  according to the second embodiment and is a diagram showing a state when floor cooling is performed.  FIG. 6  is the systematic diagram showing the poultry farming system  2  according to the second embodiment and is a diagram showing a state in which a first medium and a second medium are mixed to bring a floor surface  11  of a poultry house  10  to a predetermined temperature. A description of portions common to the first embodiment will be omitted, and portions having features only in the second embodiment will be described. Note that the same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description will be omitted. The poultry farming system  2  according to the second embodiment is different in that the first medium stored in the heating tank  32  and the second medium stored in the cooling tank  42  are configured to be mixed as compared with the poultry farming system  1  according to the first embodiment. 
     As shown in  FIGS. 4 to 6 , the poultry farming system  2  includes a poultry house  10  in which chickens are bred, a heat pump  20  capable of simultaneously taking out cold and hot heat, a heating unit  30  for heating the inside of the poultry house  10 , a cooling unit  40  for cooling the inside of the poultry house  10 , an adjusting unit  50  for adjusting the temperature and humidity in the poultry house  10 , an exhaust fan  60  for exhausting air in the poultry house  10 , a sterilizer  70  for sterilizing the inside of the poultry house  10 , a first bypass  81  for circulating a first medium in a second pipe  33 , and a second bypass  82  and a third bypass  83  connecting a second pipe  33  and a fifth pipe  43  to each other. Since the configurations of the poultry house  10 , the heat pump  20 , the heating unit  30 , the cooling unit  40 , the adjusting unit  50 , the exhaust fan  60 , and the sterilizer  70  are the same as the configurations of the poultry farming system  1  according to the above-described first embodiment, a description thereof will be omitted. That is, the poultry farming system  2  according to the second embodiment further includes the first bypass  81 , the second bypass  82 , and the third bypass  83  with respect to the poultry farming system  1  according to the first embodiment. 
     The first bypass  81  is provided to circulate the first medium in the second pipe  33 , as shown in  FIG. 4 . A three-way valve V 4  is arranged at a place where the first bypass  81  is connected to the second pipe  33  (a connection place on the left side in  FIG. 4 ). The first medium circulated through the second pipe  33  returns to the second pipe  33  through the first bypass  81  and the three-way valve V 4 . 
     As shown in  FIG. 5 , when the second medium stored in the cooling tank  42  moves to the second pipe  33 , the second medium passes through the second bypass  82 . In addition, as shown in  FIG. 5 , when the second medium returns from the second pipe  33  to the cooling tank  42 , the second medium passes through the third bypass  83 . A three-way valve V 5  is arranged at a place where the second bypass  82  is connected to the second pipe  33 . A three-way valve V 6  is arranged at a place where the third bypass  83  is connected to the second pipe  33 . 
     Next, a method for breeding chickens by the poultry farming system  2  according to the second embodiment will be described. 
     For example, in winter, it is preferable to set the inside of the poultry house  10  to a high temperature environment so as to cope with a sudden drop in the outside air temperature. 
     In winter, as shown in  FIG. 4 , by adjusting the three-way valves V 4 , V 5 , and V 6  while turning on the second heating pump P 2  and turning off the second cooling pump P 4 , only the first medium is circulated through the second pipe  33 . As a result, the floor surface  11  of the poultry house  10  is heated by floor heating. 
     On the other hand, in summer, it is preferable to set the inside of the poultry house  10  to a low temperature environment so as to cope with a sudden rise in the outside air temperature. 
     In summer, as shown in  FIG. 5 , by adjusting the three-way valves V 4 , V 5 , and V 6  while turning off the second heating pump P 2  and turning on the second cooling pump P 4 , only the second medium is circulated through the second pipe  33 . As a result, the floor surface  11  of the poultry house  10  is cooled by floor cooling. At this time, the second medium stored in the cooling tank  42  circulates in the order of the fifth pipe  43 , the second bypass  82 , the three-way valve V 5 , the second pipe  33 , the three-way valve V 6 , the third bypass  83 , and the fifth pipe  43 . 
     On the other hand, in the middle period such as spring or autumn, it is preferable to set the temperature of the floor surface  11  of the poultry house  10  to a predetermined temperature according to the temperature of the day. 
     In the middle period, as shown in  FIG. 6 , by adjusting the three-way valves V 4 , V 5 , and V 6  while turning on the second heating pump P 2  and turning on the second cooling pump P 4 , a mixed medium of the first medium and the second medium is circulated through the second pipe  33 . As a result, the floor surface  11  of the poultry house  10  can be set to a predetermined desired temperature. Further, by adjusting the three-way valves V 5  and V 6 , an amount of the second medium flowing into the second pipe  33  can be adjusted, and as a result, a temperature of the mixed medium can be adjusted. 
     As described above, the poultry farming system  2  according to the second embodiment further includes the heat pump  20  capable of simultaneously taking out cold and hot heat, and the floor surface  11  of the poultry house  10  is cooled by circulating the second medium cooled by the cold heat in the inside of the second pipe  33 . According to the poultry farming system  2  configured as described above, floor cooling is possible. For this reason, it is possible to actively cool the vicinity of a body height of the chicken, and efficiently create a comfortable space with less energy than cooling the entire poultry house  10  with an air conditioner. 
     In addition, the floor surface  11  of the poultry house  10  is brought to a predetermined temperature by circulating the mixed medium in which the second medium cooled by cold heat and the first medium heated by hot heat are mixed in the inside of the second pipe  33 . According to such a configuration, it is possible to maintain the condition of the litter (bedding) and the air in the poultry house  10  in good condition. Further, by adjusting and supplying the mixed medium to the required temperature instead of conventional natural heat dissipation when it is intended to lower the temperature in order to freely control the temperature of the floor surface  11 , it can follow a temperature change without delay even with a rapid temperature change in the external environment. 
     Modified Example 1 
     Next, a configuration of a poultry farming system according to Modified Example 1 will be described with reference to  FIG. 7 .  FIG. 7  is a systematic diagram showing a portion of a heating unit  130  of a poultry farming system according to Modified Example 1. 
     In the embodiment described above, the positioning portion  34  positions the second pipe  33  such that the intervals S 1  and S 2  between the adjacent second pipes  33  are different from each other. However, as shown in  FIG. 7 , the positioning portion  34  may position the second pipe  33  such that the intervals S 1  and S 2  are variable and a lateral length of the second pipe  33  is partially reduced. At this time, as shown in  FIG. 7 , a warm place  11 A and a cool place  11 B are formed on the floor surface  11  of the poultry house  10 , and the cool place  11 B can be formed in a wider range. 
     Modified Example 2 
     Next, a configuration of a poultry farming system  3  according to Modified Example 2 will be described with reference to  FIG. 8 .  FIG. 8  is a schematic systematic diagram showing a poultry farming system  3  according to Modified Example 2. 
     As shown in  FIG. 8 , a poultry farming system  3  according to Modified Example 2 includes the poultry house  10 , the heat pump  20 , the heating unit  130 , the cooling unit  140 , the adjusting unit  50 , the exhaust fan  60 , the sterilizer  70 , and a mixing unit  180 . Since the configurations of the poultry house  10 , the heat pump  20 , the adjusting unit  50 , the exhaust fan  60 , and the sterilizer  70  are the same as those in the above-described embodiments, a description thereof will be omitted. 
     As shown in  FIG. 8 , the heating unit  130  includes the first pipe  31  for receiving hot heat from the hot heat exchanger  24 , the heating tank  32  in which the first medium that has received the hot heat from the hot heat exchanger  24  is stored, and the second pipe  33  arranged under the floor of the poultry house  10 . 
     As shown in  FIG. 8 , the cooling unit  140  includes the fourth pipe  41  for receiving cold heat from the cold heat exchanger  25 , the cooling tank  42  in which the second medium that has received the cold heat from the cold heat exchanger  25  is stored, and a sixth pipe  143  arranged under the floor of the poultry house  10 . Circulation of the second medium in the sixth pipe  143  is performed by a third cooling pump P 5 . 
     The mixing unit  180  mixes the first medium stored in the heating tank  32  and the second medium stored in the cooling tank  42  to produce a third medium. The mixing unit  180  includes a mixing tank  181  continuous with the heating tank  32  and the cooling tank  42 , and a seventh pipe  182  arranged under the floor of the poultry house  10 . Circulation of the third medium in the seventh pipe  182  is performed by a pump P 6 . The heating tank  32  and the mixing tank  181 , and the cooling tank  42  and the mixing tank  181  are connected via a valve V 3 . 
     The amount of the first medium supplied from the heating tank  32  to the mixing tank  181  can be adjusted by an opening of the valve V 3 . In addition, the amount of the second medium supplied from the cooling tank  42  to the mixing tank  181  can be adjusted by the opening of the valve V 3 . 
     According to the poultry farming system  2  configured as described above, the temperature of the floor surface  11  can be increased in the order of a place where the second pipe  33  is arranged, a place where the seventh pipe  182  is arranged, and a place where the sixth pipe  143  is arranged. Therefore, it is possible for the chicken to move to a warm place or a cool place by itself. 
     Further, in Modified Example 2, the medium flowing through the second pipe  33 , the seventh pipe  182 , and the sixth pipe  143  has different temperatures, but for example, the temperatures of the medium flowing through the second pipe  33  and the seventh pipe  182  may be different, and the temperatures of the medium flowing through the seventh pipe  182  and the sixth pipe  143  may be the same. 
     Modified Example 3 
     Next, a configuration of a poultry farming system  4  according to Modified Example 3 will be described with reference to  FIG. 9 .  FIG. 9  is a schematic systematic diagram showing a portion of a poultry farming system  4  according to Modified Example 3. 
     As shown in  FIG. 9 , a poultry farming system  4  according to Modified Example 3 includes a plurality of (three in  FIG. 9 ) second pipes  33 , and an adjusting valve V 7  provided in each of the plurality of second pipes  33  and capable of adjusting a flow rate of the first medium in the plurality of second pipes  33 . In the poultry farming system  4  according to Modified Example 3, the heated first medium is circulated through the plurality of second pipes  33 . According to the poultry farming system  4  configured as described above, by providing an appropriate difference between the second pipes  33  in the flow rate of the first medium flowing through the plurality of second pipes  33  by the adjusting valve V 7 , a temperature difference can be generated on the floor surface  11 . 
     Note that the present invention is not limited to the above-described embodiments, and can be variously modified within the scope of the claims. 
     For example, in the embodiments described above, the present invention is applied to the poultry farming system for breeding the chickens as a livestock stall system, but may be applied to breeding pigs and the like. 
     In addition, in the embodiments described above, the positioning portion  34  positions the second pipe  33  such that a distance from the floor surface  11  was constant. However, the positioning portion  34  may position the second pipe  33  such that the distance from the floor surface  11  varies depending on the place. According to such a configuration, a temperature gradient can be generated on the floor surface  11  according to a depth from the floor surface  11 . Therefore, the chicken can move to a place in a more favorable temperature environment. 
     In addition, in the embodiments described above, the heating unit  30  has the heating tank  32 , and the cooling unit  40  has the cooling tank  42 . However, the heating unit may not have the heating tank, and the cooling unit may not have the cooling tank. At this time, it is preferable that a radiator for exhausting the cold heat and the hot heat taken out of the heat pump is provided. 
     In addition, in the embodiments described above, in order to dehumidify the poultry house  10 , the adjusting unit  50  turns off the supply of the first medium to the adjusting unit  50 , and turns on the supply of the second medium to the adjusting unit  50 . However, in order to dehumidify the poultry house  10 , the supply of the first medium to the adjusting unit  50  may be turned on, and the supply of the second medium to the adjusting unit  50  may be turned on. 
     In addition, in the embodiments described above, the form of dehumidification by a so-called compressor system that dehumidifies by utilizing the condensation generated by cooling the air was described. However, the dehumidification may be performed by a so-called desiccant type that dehumidifies by adsorbing the moisture to a desiccant. 
     In addition, in the second embodiment described above, the three-way valve V 4  was provided at the place where the first bypass  81  is connected to the second pipe  33 , the three-way valve V 5  was provided at the place where the second bypass  82  is connected to the second pipe  33 , and the three-way valve V 6  was provided at the place where the third bypass  83  is connected to the second pipe  33 . However, the valve arranged at each place may be a two-way valve. 
     REFERENCE SIGNS LIST 
       1 ,  2 ,  3 ,  4  Poultry farming system (livestock stall system) 
       10  Poultry house 
       11  Floor surface 
       20  Heat pump 
       31  First pipe 
       32  heating tank 
       33  Second pipe (pipe) 
       34  Positioning portion 
       35  Winding portion 
       36  Cleaning portion 
     S 1 , S 2  Interval between first pipes