Patent Publication Number: US-2023139832-A1

Title: Water heater receiving humidified air

Description:
TECHNICAL FIELD 
     The present disclosure relates to a water heater that receives humidified air. 
     BACKGROUND ART 
     A water heater that discharges heated water or heats water for heating generally achieves a specific purpose by causing a combustion reaction and transferring heat generated through the combustion reaction to water. The heating water generated by heating water may be provided for heating, and may be discharged to a source of demand to be used. 
     The water heater has a burner to cause a combustion engine. The burner may cause the combustion by igniting the introduced fuel and air for combustion. It is necessary to provide a temperature and a humidity that are suitable for the provided air for an efficient combustion. When air having a suitable temperature and a suitable humidity is supplied to the burner, nitrogen oxides (NOx) may be reduced. It is very important to reduce nitrogen oxides in a situation, in which an atmospheric contaminant discharge reference for a boiler becomes higher over time. 
     In general, exterior air is directly supplied to the water heater, and the air directly supplied from an outside may not include a sufficient humidity, or a specific humidity cannot be maintained according to a difference of seasons and days and nights. 
     DISCLOSURE 
     Technical Problem 
     An aspect of the present disclosure provides a water heater that receives humidified air. 
     Technical Solution 
     According to an embodiment of the present disclosure, a water heater includes a heating part including a burner that causes a combustion reaction from air and a fuel, and that generates heating water by using heat generated through the combustion reaction, and a humidification part that generates steam by steaming water by using a combustion gas generated through the combustion reaction and discharged from the heating part, and to provide the steam, together with the air, to the burner. 
     According to another embodiment of the present disclosure, a water heater includes a heating part including a burner that causes a combustion reaction from air and a fuel, a heating water heat exchanger that receives sensible heat and latent heat from a combustion gas generated through the combustion reaction to generate heating water by heating water, and a hot water heat exchanger that generates hot water by exchanging heat between the heating water and direct water, a humidification part that generates steam by steaming water by using the combustion gas, and through which the air passes, a water discharge pipeline that discharges condensate generated through condensation of the combustion gas, an air supply pipeline connecting the humidification part and the heating part to provide the air that passed through the humidification part, together with steam generated by the humidification part, to the burner, and an intermediate pipeline connecting the humidification part and the heating part to deliver the combustion gas to the humidification part. 
     Advantageous Effects 
     Accordingly, the humidified air may be provided to the burner, and an amount of nitrogen oxides generated by the water heater may be reduced. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a conceptual view of a water heater according to a first embodiment of the present disclosure. 
         FIG.  2    is a perspective view illustrating a humidification part of a water heater according to the first embodiment of the present disclosure. 
         FIG.  3    is a perspective view illustrating the humidification part of  FIG.  2   , from another angle. 
         FIG.  4    is a view illustrating the humidification part of the water heater according to the first embodiment of the present disclosure, from an upper side to a lower side. 
         FIG.  5    is a view illustrating the humidification part of the water heater according to the first embodiment of the present disclosure, from the lower side to the upper side. 
         FIG.  6    is a view illustrating flows that occur in the humidification part of the water heater and parts connected to the humidification part, according to the first embodiment of the present disclosure. 
         FIG.  7    is a view illustrating flows in wet channels and dry channels of the humidification part of the water heater according to the first embodiment of the present disclosure. 
         FIG.  8    is a conceptual view of a water heater according to a second embodiment of the present disclosure. 
         FIG.  9    is a perspective view illustrating a humidification part of according to a third embodiment of the present disclosure. 
         FIG.  10    is a view conceptually illustrating flows that occur in the humidification part according to the third embodiment of the present disclosure. 
     
    
    
     MODE FOR INVENTION 
     This application claims the benefit of priority to Korean Patent Application No. 10-2020-0125212, filed in the Korean Intellectual Property Office on Sep. 25, 2020, the entire contents of which are incorporated herein by reference. 
     Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In adding the reference numerals to the components of each drawing, it should be noted that the identical or equivalent component is designated by the identical numeral even when they are displayed on other drawings. Further, in describing the embodiment of the present disclosure, a detailed description of the related known configuration or function will be omitted when it is determined that it interferes with the understanding of the embodiment of the present disclosure. 
     In describing the components of the embodiment according to the present disclosure, terms such as first, second, A, B, (a), (b), and the like may be used. These terms are merely intended to distinguish the components from other components, and the terms do not limit the nature, order or sequence of the components. Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     First Embodiment 
       FIG.  1    is a conceptual view of a water heater  1  according to a first embodiment of the present disclosure. 
     Referring to the drawing, the water heater  1  according to the first embodiment of the present disclosure includes a heating part  20  and a humidification part  40 . The water heater  1  may further include a case  10  for embedding other components, a duct  51  that passes through the case  10  and is configured such that a combustion gas that passed through the humidification part  40  is discharged to an outside, and an external air supply pipeline  52  that passes through the case  10  and introduces air outside the case  10  into an interior of the case  10 . The water heater may include a boiler for providing heating, a hot water heater for providing hot water (a direct water type hot water heater that is not provided with a separate hot water tank, or a tank type hot water heater provided with a separate hot water tank), a boiler usable for a hot water heater, or the like. Hereafter, a boiler usable for a hot water heater will be described as an example. 
     Heating Part  20   
     The heating part  20  is configured to cause a combustion reaction and generate heating water by using heat generated therefrom. The heating water includes at least one of heating water or hot water. The heating part  20  includes a burner  26 . The heating part  20  may include a heat exchanger. 
     The burner  26  is configured to cause a combustion reaction from air and a fuel. Accordingly, the burner  26  may include a burner air supply pipeline  263  that receives air, a fuel pipeline  262  that receives the fuel, and a combustion part  261  that causes the combustion reaction by using the received air and fuel. 
     The heating part  20  may include a combustion chamber, in which flames generated through the combustion reaction may be located. The heating part  20  may include a housing  21  to define a combustion chamber in the housing  21 . Water may be injected into an interior of the combustion chamber such that a temperature of the combustion gas is within a specific range. As in the contents on the humidification part  40 , which will be described below, the water may be injected in a scheme, in which the water is sprayed into the interior of the combustion chamber, by using a nozzle or the like. The water injected into the combustion chamber may be condensate CW formed through condensation of a combustion gas. 
     The heat exchanger of the heating part  20  may include a heating water heat exchanger  22  and a hot water heat exchanger  30 . The heating water heat exchanger  22  may be embedded in the housing  21 . The heating water heat exchanger  22  may generate heating water by heating water by using convection heat generated through the combustion reaction, and sensible heat and latent heat received from the combustion gas generated from flames located in the combustion chamber. Accordingly, the heating water heat exchanger  22  may be formed in a form of a pipeline, through which water may flow and in which the combustion gas may flow along an outer surface thereof. The heating water heat exchanger  22  may further include heat transfer fins for increasing a heat transfer area thereof. However, the form of the heating water heat exchanger  22  is not limited thereto, and may be of a plate type. The heating water heat exchanger  22  may include a sensible heat type heat exchanger that uses sensible heat, and a latent heat type heat exchanger that uses latent heat. The heating water may be heated first in the latent heat type heat exchanger, and may be heated finally by the sensible heat type heat exchanger. In the drawing, it may be considered that the latent heat type heat exchanger is located on a lower side and the sensible heat type heat exchanger is located on an upper side. 
     The heating water may be delivered to a heating pipeline  70  located in a heating target that requires external heating to be used as the heating water. A closed circuit that allows the heating water to return to the heating water heat exchanger  22  in an interior of the heating part  20  such that the heating water is circulated after heat is transferred to the heating target may be formed. 
     The heating water may be delivered to the hot water heat exchanger  30  by a circulation pipeline  23  connected to the heating water heat exchanger  22  to be used to generate hot water. Opposite ends of the circulation pipeline  23  may be connected to the heating water heat exchanger  22  and may be configured such that the heating water is circulated. The hot water heat exchanger  30  may be disposed outside the housing  21 , but may be disposed in an interior of the housing  21 . The hot water heat exchanger  30  may receive direct water and generate hot water by exchanging heat with the heating water. The hot water may be discharged to a source of demand to be used. The hot water heat exchanger  30  may be configured such that a hot water direct water pipeline  61  passes therethrough such that the direct water is introduced from the outside and is discharged after becoming hot water. A direct water pipeline  60 , through which direct water is introduced from the outside to an interior of the case  10  may be divided into the hot water direct water pipeline  61  and a humidifying direct water pipeline  62 . 
     Although it has been described in the first embodiment of the present disclosure that the heat exchanger includes the heating water heat exchanger  22  and the hot water heat exchanger  30 , it may include only one of the heating water heat exchanger  22  and the hot water heat exchanger  30 , and the hot water heat exchanger  30  of a type that directly uses heat generated through a combustion reaction in heating hot water may be used. The heating part  20  is not limited to the one described and illustrated in the first embodiment of the present disclosure, and may be formed of a hot water storage type. 
     The combustion gas may be condensed to generate condensate CW. The condensate CW may be discharged through a water discharge pipeline  25  located at a lower end of the heating part  20 . A trap may be disposed in the water discharge pipeline  25  such that the combustion gas is prevented from being discharged therethrough, and a neutralization device may be disposed to neutralize and discharge the condensate CW that is acidic. 
     To provide the combustion gas to the humidification part  40 , which will be described below, the heating part  20  may further include an intermediate pipeline  24  that connects the housing  21  and the humidification part  40 . The intermediate pipeline  24  may deliver the combustion gas that passed through the heat exchanger to exchange heat to the humidification part  40 . 
     Humidification Part  40   
       FIG.  2    is a perspective view illustrating the humidification part  40  of the water heater  1  according to the first embodiment of the present disclosure.  FIG.  3    is a perspective view illustrating the humidification part of  FIG.  2   , from another angle.  FIG.  4    is a view illustrating the humidification part of the water heater according to the first embodiment of the present disclosure, from an upper side to a lower side.  FIG.  5    is a view illustrating the humidification part of the water heater according to the first embodiment of the present disclosure, from the lower side to the upper side.  FIG.  6    is a view illustrating flows that occur in the humidification part  40  of the water heater  1  and parts connected to the humidification part  40 , according to the first embodiment of the present disclosure.  FIG.  7    is a view illustrating flows in wet channels  431  and dry channels  432  of the humidification part  40  of the water heater  1  according to the first embodiment of the present disclosure. 
     The humidification part  40  is a component that is configured to provide humidified air to the burner  26 . The humidification part  40  is configured to generate steam by steaming water and provide the steam, together with the air, to the burner  26 . To generate steam, the humidification part  40  may use the combustion gas that is generated through the combustion reaction and is discharged from the heating part  20  after heat is transferred to the heating water. Because the combustion gas has a high temperature after the heat is transferred to the heating water, the humidification part  40  may generate steam by using heat left in the combustion gas. Because the humidification part  40  performs an operation of generating the steam, the humidification part  40  may be formed of a material having a corrosion-resistant property, such as stainless steel, to be prevented from being corroded due to moisture and durability thereof from being degraded. 
     The humidification part  40  may include a plurality of wet channels  431  and a plurality of dry channels  432 . The dry channels  432  provide a space, through which the combustion gas passes, and the wet channels  431  provide a space, through which the air delivered from the outside flows and passes, from which the water is ejected, and in which the ejected water is steamed to become steam. The wet channels  431  and the dry channels  432  may be divided such that different materials cannot be communicated therebetween. 
     The plurality of dry channels  432  and the plurality of wet channels  431  may be alternately disposed such that heat is efficiently exchanged. Because the dry channels  432  and the wet channels  431  are disposed alternately, a heat exchange area becomes larger, whereby the heat of the combustion gas that passes through the dry channels  432  may be efficiently transferred to water drops “D” formed on inner surfaces of the wet channels  431  after being ejected from the wet channels  431 . Furthermore, the fluids that flow in the wet channels  431  and the dry channels  432  may not directly meet each other but may indirectly exchange heat. 
     The humidification part  40  may include a plurality of partition plates  433 . The partition plates  433  having a plate shape may be disposed in parallel to each other at a specific interval, and may define the plurality of wet channels  431  and the plurality of dry channels  432 . 
     The humidification part  40  may further include a plurality of heat transfer fins. The heat transfer fins may be disposed between adjacent partition plates  433 . The heat transfer fins may contact at least one of the adjacent partition plates  433  to increase a heat transfer area of the partition plate  433 . The heat transfer fins may be disposed on the surfaces of the partition plates  433  to protrude from the surfaces. Among the plurality of heat transfer fins, heat transfer fins that protrude in opposite directions and face each other may contact each other. The heat transfer fins may be disposed on an inner side of the wet channels  431  and the dry channels  432  to increase heat exchange efficiencies in the channels. In the drawings, the heat transfer fins are not illustrated separately. 
     Among the side surfaces of the partition plates  433 , side surfaces that define inner surfaces of the wet channels  431  may be hydrophilic surfaces. A hydrophilic treatment is performed on the inner surfaces of the wet channels  431 , and thus they may become hydrophilic surfaces. Chemical etching, a sol-gel method, a surface coating method, and a negative ion exchange method may be used as the hydrophilic treatment. Depressions and bosses may be formed on the inner surfaces of the wet channels  431  such that water drops are generated so that heat may be easily transferred. Because the inner surfaces of the wet channels  431  are hydrophilic, the ejected water may be easily located on the inner surfaces of the wet channels  431 , and the heat of the combustion gas that passes through the dry channels  432  may be easily transferred for steaming. 
     The humidification part  40  may further include a nozzle  44 . The nozzle  44  is configured to eject water to the plurality of wet channels  431 . The nozzle  44  may be disposed on an upper side of the plurality of wet channels  431 , and may be configured such that the ejected water is lowered by the self-weight thereof to be uniformly distributed in the wet channels  431 . The nozzle  44  may directly eject the water to the wet channels  431 , but may be disposed to eject the water to an upper side while facing the upper side. The nozzle  44  may spray the water in a form of small water drops. 
     The water may be provided by direct water that is delivered from at least one water source. Accordingly, the nozzle  44  may eject the direct water to the plurality of wet channels  431  by using a direct hydraulic pressure. The nozzle  44  may be connected to the humidifying direct water pipeline  62  to receive direct water. 
     The humidification part  40  may include a humidification body  43 , a first passage guide part  41 , and a second passage guide part  42 . The first passage guide part  41  may be disposed on a lower side of the humidification body  43  and the second passage guide part  42  may be disposed on an upper side of the humidification body  43 , but the dispositions thereof are not limited thereto. 
     The humidification body  43  may include a main dry channel and a main wet channel. The first passage guide part  41  may include a first passage guide dry-channel and a first passage guide wet-channel, and the second passage guide part  42  may include a second passage guide dry-channel and a second passage guide wet-channel. The dry channel  432  may be formed by sequentially connecting the first passage guide dry-channel, the main dry channel, and the second passage guide dry-channel. The wet channel  431  may be formed by sequentially connecting the second passage guide wet-channel, the main wet channel, and the first passage guide wet-channel. A combustion gas discharge passage, through which the combustion gas flows from the heating part  20  to the outside to be discharged, is formed along the dry channels  432 , and an air supply passage, through which the air and the steam are introduced from the outside to the burner  26 , is formed along the wet channels  431 . The air supplied by the air supply passage and the combustion gas discharged by the combustion gas discharge passage cross each other in the humidification part  40  for heat exchange. In particular, the supplied air and the combustion gas may counter-flow with respect to each other in opposite directions in the humidification body  43  as illustrated, for heat exchange. 
     The first passage guide dry-channel is configured to guide the combustion gas discharged from the heating part  20  to the main dry channel. Accordingly, the first passage guide dry-channel may be connected to the intermediate pipeline  24  and the humidification body  43 . The first passage guide wet-channel is configured to guide the air and the steam discharged from the main wet channel to the burner  26 . Accordingly, the first passage guide wet-channel may be connected to the burner air supply pipeline  263  and the humidification body  43 . 
     The second passage guide wet-channel is configured to guide the air supplied from an outside of the humidification part  40  to the main wet channel. Accordingly, the second passage guide wet-channel may be connected to the external air supply pipeline  52 , which is a pipeline that is opened to the outside such that the external air is introduced therethrough, and the humidification body  43 . The second passage guide dry-channel is configured to guide the steam discharged from the main dry channel to the duct  51 . Accordingly, the second passage guide dry-channel may be connected to the duct  51  and the humidification body  43 . 
     The first passage guide may have a first body surface  411  that is a surface connected to the humidification body  43 . The outlet of the first passage guide dry-channel and the inlet of the first passage guide wet-channel may be disposed together on, among the side surfaces of the first passage guide, the first body surface  411  that is a surface connected to the humidification body  43 . However, the inlet of the first passage guide dry-channel and the outlet of the first passage guide wet-channel may be disposed, respectively, on a first passage guide inlet surface  413  and a first passage guide outlet surface  412  that are, among the side surfaces of the first passage guide, two surfaces that are different from the first body surface  411 . That is, when viewed in the same direction as that of  FIG.  6   , the first passage guide may have a triangular shape. Because the first passage guide outlet surface  412  may be formed to face a lower side, the outlets of the wet channels  431  formed on the first passage guide outlet surface  412  may be opened to face the lower side. Accordingly, the steam included in the supplied air provided through the wet channels  431  or the water injected into the wet channels  431  may flow along the wet channels  431  or drop to reach the inlet of the burner air supply pipeline  263 . The outlet of the humidification part  40  may include the outlets of the wet channels  431  formed in the first passage guide part  41 , and the outlets of the dry channels  432  formed in the second passage guide part  42 . 
     The second passage guide may have a second body surface  421  that is a surface connected to the humidification body  43 . The inlet of the second passage guide dry-channel and the outlet of the second passage guide wet-channel may be disposed together on, among the side surfaces of the second passage guide, the second body surface  421  that is a surface connected to the humidification body  43 . However, the outlet of the second passage guide dry-channel and the inlet of the second passage guide wet-channel may be disposed, respectively, on a second passage guide outlet surface  422  and a second passage guide inlet surface  423  that are, among the side surfaces of the second passage guide, two surfaces that are different from the second body surface  421 . That is, when viewed in the same direction as that of  FIG.  6   , the second passage guide may have a triangular shape. However, the shapes of the first passage guide and the second passage guide are not limited thereto. 
     The first passage guide may be directly or indirectly coupled to the intermediate pipeline  24  of the heating part  20  through brazing welding. The second passage guide may be coupled to the duct  51  through brazing welding. Accordingly, the humidification part  40  may be easily coupled to other components. Furthermore, the components of the humidification part  40  also may be formed as a single body through brazing welding, or all or some components may be integrally formed through a scheme, such as injection-molding. That is, the first passage guide part  41 , the second passage guide part  42 , and the humidification body  43  have been described in the specification as separate components, but at least some of them may constitute an integral component. The above-described brazing-welded part may be further sealed by further using another unit. 
     A siphon part  83  may be connected to an inlet of the burner air supply pipeline  263  that connects the humidification part  40  and the combustion part  261 , which is connected to the humidification part  40 . The siphon part  83  may be a pipe that has a “U”-shaped part to cause a siphon phenomenon and has a serpentine shape. The water that is generated through condensation again as the supplied air including the steam discharged to the burner air supply pipeline  263  is condensed, or the water that is injected into the humidification part  40  but has not been steamed yet, and flows down and drops may gather in the siphon part  83 . The gathering water may be collected in the siphon part  83  to define a “U”-shaped trap. When a specific volume or more of water gathers in the siphon part  83 , the siphon phenomenon occurs and the water that defines the trap may be discharged at the same time. 
     Meanwhile, in a modification of an embodiment of the present disclosure, an air/water discharge part including a pipeline connected to a separate valve and an outside, instead of the siphon part  83 , may be further formed to be connected to the burner air supply pipeline  263 . Similarly to the siphon part  83 , the water may be collected in the air/water discharge part, and the water may be discharged to the outside as the valve is opened. 
     Second Embodiment 
       FIG.  8    is a conceptual view of a water heater  2  according to a second embodiment of the present disclosure. 
     The water heater  2  according to the second embodiment of the present disclosure basically has the same configuration as that of the water heater  1  according to the first embodiment of the present disclosure, except for some parts thereof. Accordingly, only the different parts will be further described. In the water heater  2  according to the second embodiment of the present disclosure, condensate CW instead of direct water may be supplied to the nozzle  44 . Accordingly, the water heater  2  may include a pump  82  and a condensate pipeline  81 , and may have a direct water pipeline  600  that is not branched from the humidifying direct water pipeline ( 62  of  FIG.  1   ). The condensate pipeline  81  connects the water discharge pipeline  25 , in which the condensate CW gathers, and the nozzle  44 , and the pump  82  is disposed in the condensate pipeline  81  to pump the condensate CW to the humidification part  40 . The nozzle  44  may eject the condensate CW to the plurality of wet channels  431  by using a pressure applied to the condensate CW by the pump  82 . 
     Although it has been described in the first embodiment and the second embodiment of the present disclosure that the direct water and the condensate CW are ejected by the nozzle  44 , the water may be provided by at least one of the direct water and the condensate CW to be ejected, and the water heater, in which both of the direct water and the condensate are ejected by the nozzle or one of them is selectively ejected, may be carried out. 
     The flames generated by the burner that received humidified air may be stabilized and the temperature of the flames may be made to become lower, by using a scheme, in which the water is ejected to the supplied air and exchanges heat with the combustion gas as in the humidifier of the water heater of the present disclosure. Accordingly, nitrogen oxides and soot may be reduced. Because a concentration of steam in the supplied air may be increased, convection heat transfer and a concentration of radicals may be increased, whereby pollutants may be reduced. Furthermore, because the wasted heat recovery efficiency of the combustion gas increased, more condensate is generated, and fine dust and water soluble nitrogen oxides also may be easily collected. 
     A higher concentration of steam in the supplied air may be obtained by using a scheme of transferring heat of the combustion gas and heating the water for humidification, as in the scheme of using the water heater of the present disclosure, as compared with a case, in which humidification is made in a scheme of simply ejecting water to the supplied air. 
     In an steaming/cooing device that has a structure that is similar to that of the humidification part of the present disclosure, the air discharged from an interior may be humidified through steaming while passing through the wet channels, and the exterior air introduced into the interior may be cooled by latent heat during steaming while passing through the dry channels. In the humidification part of the present disclosure, humidification is made through steaming while the combustion gas that is heated to a high temperature passes through the dry channels and the exterior air passes through the wet channels. It may be seen that the exterior air and the interior air, a temperature difference of which is not explicit, exchange heat in the steaming/cooling device, but a temperature difference between the combustion gas of a high temperature and the exterior air is relatively large whereby heat transfer from the combustion gas to the exterior air and the sprayed water may be more effectively made in the humidification part of the present disclosure. Furthermore, in the steaming/cooling device, an obtained advantage is mere because the interior air discharged to the outside is heated. However, according to the humidification part of the present disclosure, a material, such as PVC, which has a relatively low heat-resistant property may be used as a component, such as a duct, which is used for discharging the combustion gas, by cooling the discharged combustion gas, whereby the selection of the material may be widened, and a durability of the components used for discharging the combustion gas may be increased. 
     Third Embodiment 
       FIG.  9    is a perspective view illustrating a humidification part  40   b  of according to a third embodiment of the present disclosure.  FIG.  10    is a view conceptually illustrating flows that occur in the humidification part  40   b  according to the third embodiment of the present disclosure. 
     Configurations of the humidification part  40   b  according to the third embodiment of the present disclosure are similar to those of the humidification part  40  according to the first embodiment but only some of them are different, and thus only different parts will be additionally described. Referring to the drawings, the humidification part  40   b  according to the third embodiment of the present disclosure may have a rectangular parallelepiped shape as illustrated. Wet channels  431   b  and dry channels  432   b  may be stacked alternately along an upward/downward direction. Accordingly, the supplied air and the combustion gas that flow in the wet channels  431   b  and the dry channels  432   b  may not directly meet each other but may indirectly exchange heat. 
     The inlets and the outlets of the wet channels  431   b  may be disposed, respectively, on the front surface and the rear surface of the humidification part  40   b , which is viewed in the drawing, and the inlets and the outlets of the dry channels  432   b  may be disposed, respectively, on the left side surface and the right side surface of the humidification part  40   b . Accordingly, as viewed in the drawings, the supplied air that flows through the wet channels  431   b  and the combustion gas that flows through the dry channels  432   b  may indirectly cross each other in a form of cross-flows, in an interior of the humidification part  40   b . Because the humidification part  40   b  according to the third embodiment of the present disclosure is formed as illustrated, the humidification part  40   b  having a simplified configuration and a reduced volume may be constituted. 
     A nozzle  44   b  for ejecting water to the wet channels  431   b  may be disposed to be adjacent to the front surface of the humidification part  40   b . The nozzle  44   b  may apply the steaming water to the wet channels  431   b  in a scheme of ejecting water strongly toward the rear side, unlike the nozzle  44  of the first embodiment, which is formed such that the inlets of the wet channels  431  face the upper side to inject the water in a scheme of dropping the water. The nozzle  44   b  may be disposed on a front side of the front surface of the humidification part  40   b , may be disposed to be adjacent to an upper end of the front surface, and may be inclined in a direction that becomes closer to the front surface of the humidification part  40   b  with respect to the lower side to uniformly eject the water to the wet channels  431   b.    
     Although it has been described in the third embodiment that the wet channels  431   b  and the dry channels  432   b  of the humidification part  40   b  are disposed to face the horizontal direction, it indicates a relative direction for convenience of description, and the directions, which the wet channels  431   b  and the dry channels  432   b  face may be changed according to an angle, at which the humidification part  40   b  is disposed. 
     Although it may have been described until now that all the elements constituting the embodiments of the present disclosure are coupled to one or coupled to be operated, the present disclosure is not essentially limited to the embodiments. That is, without departing from the purpose of the present disclosure, all the elements may be selectively coupled into one or more elements to be operated. Furthermore, because the terms, such as “comprising”, “including”, or “having” may mean that the corresponding element may be included unless there is a specially contradictory description, it should be construed that another element is not extruded but may be further included. In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meanings as those generally understood by those skilled in the art to which the present disclosure pertains. The terms, such as the terms defined in dictionaries, which are generally used, should be construed to coincide with the context meanings of the related technologies, and are not construed as ideal or excessively formal meanings unless explicitly defined in the present disclosure. 
     The above description is a simple exemplification of the technical spirits of the present disclosure, and the present disclosure may be variously corrected and modified by those skilled in the art to which the present disclosure pertains without departing from the essential features of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are not provided to limit the technical spirits of the present disclosure but provided to describe the present disclosure, and the scope of the technical spirits of the present disclosure is not limited by the embodiments. Accordingly, the technical scope of the present disclosure should be construed by the attached claims, and all the technical spirits within the equivalent ranges fall within the scope of the present disclosure.