Ventilating and air conditioning device

Abstract

To eliminate need for construction work for treating condensate generated by a heat exchanger, even when the heat exchanger for cooling air is disposed in an air conditioning casing.SOLUTION: When a refrigerant flow is switched to a cooling mode by a four-way valve, and an indoor-side heat exchanger functions as an evaporator, moisture in the air that is condensed on a surface of the indoor-side heat exchanger is evaporated using heat from an outdoor-side heat exchanger. An outdoor-side evaporation mechanism that evaporates condensate generated by the indoor-side heat exchanger using heat from the outdoor heat exchanger, is disposed in an air conditioning casing. Therefore, during cooling operation in which a large amount of condensate is generated, treatment of the condensate generated at the indoor-side heat exchanger can be completed in the air-conditioning casing. Although condensate is generated at the outdoor-side heat exchanger during heating operation, the amount of condensate generated during the heating operation is smaller than that generated during the cooling operation. Accordingly, no special construction work for discharging the condensate to the outside of a building is required.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The disclosure of this specification relates to a ventilating and air-conditioning system that ventilates and conditions the air-conditioned space of a building. [Background technology]

[0002] A ventilating air-conditioning system that ventilates and air-conditions the air-conditioned space of a building is disclosed in Patent Documents 1 and 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 06-123444 [Patent Document 2] Japanese Patent Application Publication No. 06-123469 Summary of the Invention [Problem to be solved by the invention]

[0004] The ventilating air-conditioning system disclosed in the above-mentioned prior art document performs ventilation and air-conditioning by arranging refrigeration cycle heat exchangers downstream of the indoor air side and the outdoor air side of the air flow of a heat exchanger that exchanges heat between indoor air and outdoor air. However, when the heat exchanger functions as a condenser, condensed water is generated, and the ventilating air-conditioning system in the prior art document does not take into consideration how to treat the condensed water.

[0005] When condensation occurs, it is usually drained outside the building. Therefore, a drain pipe must be installed for drainage. This is a separate construction project from the installation of the air supply duct. When installing an air supply duct, the slope is not a major consideration, but when installing a drain pipe, the slope must be taken into consideration to ensure that the condensed water is reliably drained outside the building by gravity. In view of the above, the present disclosure aims to provide a ventilation air-conditioning system that does not require construction to treat the condensed water generated by a heat exchanger that cools the air inside the air-conditioning case. [Means for solving the problem]

[0006] The present disclosure relates to a ventilating air-conditioning system that ventilates and conditions the air of an air-conditioned space of a building. The ventilating air-conditioning system of the present disclosure includes an air-conditioning case that includes an outdoor inlet for introducing outside air, an indoor outlet for blowing the outside air into the air-conditioned space of the building, an indoor outlet for introducing inside air, which is air inside the air-conditioned space of the building, and an outdoor outlet for exhausting the inside air to the outside of the building. The system also includes a first heat exchanger disposed within the air-conditioning case that exchanges heat between the outside air flowing from the outdoor inlet to the indoor outlet and the inside air flowing from the indoor outlet to the outdoor outlet, an indoor heat exchanger disposed within the air-conditioning case closer to the indoor outlet in the direction of the outside air flow than the first heat exchanger and that exchanges heat with the outside air after passing through the first heat exchanger, and an outdoor heat exchanger disposed within the air-conditioning case closer to the outdoor outlet in the direction of the inside air flow than the first heat exchanger and that exchanges heat with the inside air after passing through the first heat exchanger.

[0007] The ventilating air-conditioning system of the present disclosure also includes an outdoor evaporation mechanism disposed within the air conditioning case that evaporates condensed water generated in the indoor heat exchanger using heat from the outdoor heat exchanger. The system further includes a compressor that draws, compresses, and discharges a refrigerant, a four-way valve that switches between a cooling flow in which the refrigerant is drawn into the compressor from the indoor heat exchanger and compressed by the compressor and then discharged to the outdoor heat exchanger, and a heating flow in which the refrigerant is drawn into the compressor from the outdoor heat exchanger and compressed by the compressor and then discharged to the indoor heat exchanger, an expander disposed between the indoor heat exchanger and the outdoor heat exchanger and that decompresses the refrigerant, and refrigerant piping that connects the indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve, and the expander.

[0008] The ventilating air-conditioning system of the present disclosure includes an outdoor air blower that blows outdoor air from the outdoor inlet of the air conditioning case to the indoor outlet, and an indoor air blower that blows indoor air from the indoor exhaust port of the air conditioning case to the outdoor exhaust port.

[0009] In the ventilating air-conditioning system of the present disclosure, when the four-way valve switches the refrigerant flow to cooling, causing the indoor heat exchanger to function as an evaporator and the outdoor heat exchanger to function as a condenser, moisture in the air condensed on the surface of the indoor heat exchanger can be evaporated using the heat of the outdoor heat exchanger. In particular, the ventilating air-conditioning system of the present disclosure includes an outdoor evaporating mechanism located within the air conditioning case that evaporates condensed water generated in the indoor heat exchanger using the heat of the outdoor heat exchanger. This allows for the complete disposal of condensed water generated in the indoor heat exchanger during cooling operation, when a large amount of condensed water is generated, within the air conditioning case. Although condensed water is generated in the outdoor heat exchanger during heating operation, the amount of condensed water generated during heating operation is less than that generated during cooling operation. Therefore, the condensed water can be disposed of using the outdoor evaporating mechanism even during heating operation. This eliminates the need for special construction to drain condensed water outside the building.

[0010] In addition to the outdoor evaporative mechanism, an indoor evaporative mechanism that evaporates condensed water produced in the outdoor heat exchanger using the heat of the indoor heat exchanger may also be placed inside the air conditioning case. In this case, when the four-way valve switches the refrigerant flow to heating mode, and the indoor heat exchanger acts as a condenser and the outdoor heat exchanger acts as an evaporator, the moisture in the air that has condensed on the surface of the outdoor heat exchanger can be evaporated using the heat of the indoor heat exchanger. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an explanatory diagram showing a building in which a ventilation air-conditioning system is installed. [Figure 2] FIG. 1 is an explanatory diagram showing the configuration of a ventilation air-conditioning device. [Figure 3] FIG. [Figure 4] FIG. 2 is a perspective view showing details of a total heat exchanger. [Figure 5] FIG. 2 is an explanatory diagram showing an outdoor evaporative mechanism and an indoor evaporative mechanism. [Figure 6] FIG. [Figure 7] FIG. 10 is a perspective explanatory view showing another example of the air conditioning case. [Figure 8]FIG. 8 is a view of FIG. 7 as seen from the VIII direction. [Figure 9] 7 seen from the direction IX. [Figure 10] FIG. 8 is an explanatory diagram showing a ventilating air-conditioning system using the air-conditioning case shown in FIG. [Figure 11] FIG. 11 is a perspective view of the ventilating air-conditioning system shown in FIG. [Figure 12] FIG. 8 is an explanatory diagram showing another example of the arrangement of a ventilating air-conditioning system using the air-conditioning case shown in FIG. 7. [Figure 13] FIG. 13 is a perspective view of the ventilating air-conditioning system shown in FIG. [Figure 14] 10 is an explanatory diagram showing another example of an outdoor evaporative mechanism and an indoor evaporative mechanism. FIG. [Figure 15] FIG. 10 is an explanatory diagram showing still another example of the outdoor evaporative mechanism and the indoor evaporative mechanism. [Figure 16] FIG. 10 is an explanatory diagram showing another example of the arrangement of the outdoor evaporation mechanism. [Figure 17] FIG. 1 is an explanatory diagram showing an example of the arrangement of ventilation air-conditioning devices in a building. DETAILED DESCRIPTION OF THE INVENTION

[0012] As shown in Fig. 1, the ventilating air-conditioning system 100 of the present disclosure is installed in an attic 201, a machine room 202, or the like of a building 200. Although Fig. 1 shows a two-story building 200, the building may be one-story or three or more stories. The building 200 may also be a detached house or a multi-family dwelling such as an apartment or condominium. Furthermore, the building 200 may also be an office building, a commercial facility, or the like.

[0013] In the example of a detached house in FIG. 1 , the ventilating air-conditioning system 100 performs ventilation and air-conditioning for the entire house. However, some rooms in the building 200 are individually equipped with room air conditioners 210. In the example of FIG. 1 , room air conditioners 210 are installed in the master bedroom 203 and the living-dining-kitchen room 204. The room air conditioners 210 are individually controlled by their respective remote controls 211. Note that FIG. 1 also shows other rooms, such as a Western-style room 205, a hallway 206, a study 207, a hall 208, and a dressing room 209, which are not equipped with room air conditioners 210. However, conditioned air from the ventilating air-conditioning system 100 is supplied to these rooms as well. The space conditioned by the ventilating air-conditioning system 100, including both rooms equipped with room air conditioners 210 and rooms not equipped with them, is referred to as air-conditioned space 220.

[0014] The ventilating air-conditioning system 100 includes an air-conditioning case 110 that is installed in the attic 201 or the machine room 202. When the air-conditioning case 110 is installed in the attic 201, for example, it is sized to fit through an inspection hatch so that it can be installed even after the building 200 has been constructed. Assuming that the width of the inspection hatch is 50 cm square, the air-conditioning case 110 is sized to be approximately 45 cm long and 70 cm deep. This allows an air-conditioning case 110 with a depth of approximately 70 cm to be carried into the attic 201 through the inspection hatch. Once carried into the attic 201, the air-conditioning case 110 is installed on the floor of the attic 201 with a depth of approximately 70 cm and a width of approximately 45 cm. However, the air-conditioning case 110 in this example can be made even more compact. By carefully arranging the devices such as the total heat exchanger 150 and the compressor 160, the length, width, and depth can also be reduced to approximately 45 cm.

[0015] 2, the air conditioning case 110 is formed with an outdoor inlet 111 that introduces air outside the building 200 (outside air OA) and an indoor outlet 112 that blows the introduced outside air OA toward the air-conditioned space 220 of the building 200. The air conditioning case 110 also has an indoor exhaust port 113 that introduces air inside the air-conditioned space 220 of the building 200 (inside air RA), and an outdoor exhaust port 114 that exhausts the introduced inside air RA to the outside of the building 200. In the figure, inside air is represented by RA and outside air is represented by OA.

[0016] As described above, the air conditioning case 110 is placed in the attic 201, and is therefore separated from the outside of the building 200 and the air-conditioned space 220. Therefore, outside air OA is introduced into the air conditioning case 110 via the outside air introduction duct 120. For this purpose, the outdoor air inlet 111 is connected to the outside air introduction duct 120. The air conditioning case 110 and the air-conditioned space 220 are connected by the outside air outlet duct 122. Therefore, the outside air outlet 122 is connected to the indoor outlet 112. Regarding the introduction of inside air RA, since the air conditioning case 110 is placed inside the building 200, the inside air RA may be introduced directly from the indoor exhaust port 113. In the example of FIG. 1 , the air conditioning case 110 placed in the attic 201 has the inside air blower 130 placed directly at the indoor exhaust port 113. On the other hand, in the air conditioning case 110 installed in the machine room 202, the indoor air blower 130 and the indoor exhaust port 113 are connected by an indoor exhaust duct 123. The outdoor exhaust port 114 of the air conditioning case 110 is connected to the outside of the building 200 by an outdoor exhaust duct 124.

[0017] A total heat exchanger 150 is disposed inside the air conditioning case 110, which exchanges sensible heat and latent heat between the room air RA and the outside air OA. The total heat exchanger 150 corresponds to the first heat exchanger in the present disclosure. However, the first heat exchanger in the present disclosure is not necessarily limited to the total heat exchanger 150, and may be a heat exchanger that exchanges only sensible heat. The first heat exchanger in the present disclosure may be any heat exchanger that can exchange heat between the room air RA and the outside air OA.

[0018] As shown in Fig. 3, the total heat exchanger 150 has rectangular flat nonwoven fabrics 152 and corrugated nonwoven fabrics 153 for air flow arranged alternately within frames 151 arranged at the four corners. End plates 154 that sandwich and hold the flat nonwoven fabrics 152 and the corrugated nonwoven fabrics 153 are arranged at the left and right ends in Fig. 3. The corrugated nonwoven fabric 153 also has indoor air passages 1531 for passing indoor air RA and outdoor air passages 1532 for passing outdoor air OA arranged alternately in the perpendicular direction. Therefore, sensible heat is exchanged between the indoor air RA and the outdoor air OA through heat transfer between the flat nonwoven fabrics 152 and the corrugated nonwoven fabrics 153. Furthermore, since the flat nonwoven fabric 152 is permeable to moisture, latent heat can also be exchanged between moist air and dry air.

[0019] FIG. 3 conceptually illustrates the total heat exchanger 150, with the flat nonwoven fabric 152 having a thickness of only a few tens of micrometers. The corrugated nonwoven fabric 153 also has a passageway through which air passes that is approximately 2.5 millimeters high. Therefore, the flat nonwoven fabric 152 and the corrugated nonwoven fabric 153 are actually stacked in a large number of layers. FIG. 4 illustrates the total heat exchanger 150 in more detail. In the example of FIG. 4, the inside air RA flowing from the front to the back of the page intersects with the outside air OA flowing from top to bottom. Furthermore, in the example of FIG. 4, the flat nonwoven fabric 152 and the corrugated nonwoven fabric 153 are stacked in more than 150 layers.

[0020] Returning to FIG. 2 , the air conditioning case 110 is equipped with a compressor 160, a four-way valve 161, an indoor heat exchanger 162, an electric expansion valve 163, an outdoor heat exchanger 164, and refrigerant piping 165 connecting these components, all of which constitute a refrigeration cycle. The compressor 160 repeatedly expands and contracts the volume of its compression chamber as the motor rotates. When the volume of the compression chamber expands, it draws refrigerant into the compression chamber, and when the volume of the compression chamber contracts, it compresses and discharges the refrigerant. The four-way valve 161 switches the refrigerant flow between a cooling flow and a heating flow. For the cooling flow, the refrigerant from the indoor heat exchanger 162 is drawn into the compressor 160, and the refrigerant piping 165 is switched so that the refrigerant discharged from the compressor 160 flows into the outdoor heat exchanger 164. For the heating flow, the refrigerant piping 165 is switched so that the refrigerant flows in the opposite direction. In the heating flow, the four-way valve 161 draws refrigerant from the outdoor heat exchanger 164 into the compressor 160 and directs the refrigerant discharged from the compressor 160 toward the indoor heat exchanger 162. The electric expansion valve 163 adiabatically expands the refrigerant, converting the high-temperature, high-pressure refrigerant upstream into a low-temperature, low-pressure refrigerant and flowing it downstream. The electric expansion valve 163 controls the area of ​​its throttling section to optimize the adiabatic expansion of the refrigerant during cooling and heating operations. However, in this disclosure, it is not essential that the expansion valve be electrically controlled. A mechanical expansion valve that variably controls the area of ​​its throttling section according to the refrigerant pressure may also be used. Alternatively, a capillary tube capable of adiabatic expansion of the refrigerant may be used. In this disclosure, devices that have the function of adiabatic expansion of the refrigerant, such as the electric expansion valve 163, mechanical expansion valves, and capillary tubes, are collectively referred to as expansion valves.

[0021] Both the indoor heat exchanger 162 and the outdoor heat exchanger 164 are disposed downstream of the total heat exchanger 150 in terms of air flow. During cooling operation in summer, the outdoor heat exchanger 164 dissipates heat from the high-temperature, high-pressure gas refrigerant. The outdoor heat exchanger 164 is supplied with the room air RA that has undergone heat exchange in the total heat exchanger 150, and the relatively cool room air RA promotes heat dissipation from the outdoor heat exchanger 164. The heat exchange area of ​​the outdoor heat exchanger 164 is the same as the area of ​​the room air passage 1531 of the total heat exchanger 150. Therefore, the room air RA that has passed through the room air passage 1531 of the total heat exchanger 150 flows directly to the outdoor heat exchanger 164. The same is true for the indoor heat exchanger 162. The outdoor air OA that has passed through the outdoor air passage 1532 of the total heat exchanger 150 flows directly to the indoor heat exchanger 162.

[0022] Inside the air conditioning case 110, an indoor evaporation mechanism 170 is disposed downstream of the outdoor air OA of the indoor heat exchanger 162. An outdoor evaporation mechanism 180 is disposed downstream of the indoor air RA of the outdoor heat exchanger 164. The configurations of the indoor evaporation mechanism 170 and the outdoor evaporation mechanism 180 will be described with reference to FIG. 5 . The indoor evaporation mechanism 170 evaporates condensed water, which is formed when moisture in the air condenses on the surface of the outdoor heat exchanger 164, using heat generated by the indoor heat exchanger 162. Therefore, an outdoor heat exchanger drain pan 171, which collects condensed water generated in the outdoor heat exchanger 164, is disposed below the outdoor heat exchanger 164 in the vertical direction. An indoor evaporation drain pan 172 is disposed below the indoor heat exchanger 162 in the vertical direction and further below the outdoor heat exchanger drain pan 171 in the vertical direction. An indoor evaporation water conduit 173 that connects the outdoor heat exchange drain pan 171 and the indoor evaporation drain pan 172 is disposed between the outdoor heat exchange drain pan 171 and the indoor evaporation drain pan 172. This allows condensed water generated in the outdoor heat exchanger 164 to be guided to the indoor evaporation drain pan 172 via the indoor evaporation water conduit 173.

[0023] An indoor evaporation filter material 174 is disposed in the indoor evaporation drain pan 172. The indoor evaporation filter material 174 is made of a highly absorbent material, such as a hydrophilic resin material shaped into fibers to enhance its absorbency. Examples of resin materials include polyester fibers. The indoor evaporation filter material 174 is supported by a filter material frame 175 to enhance its rigidity. The lower end of the indoor evaporation filter material 174 contacts the indoor evaporation drain pan 172, enabling it to absorb condensed water that has flowed into the indoor evaporation drain pan 172. Because the indoor evaporation filter material 174 may remain moist for an extended period of time, it also has antibacterial and antifungal properties. The upper end of the indoor evaporation filter material 174 faces the indoor air passage of the indoor heat exchanger 162. Therefore, the condensed water absorbed by the indoor evaporation drain pan 172 is heated by the indoor air RA that has passed through the indoor heat exchanger 162 and evaporates.

[0024] The outdoor evaporation mechanism 180 has a configuration similar to that of the indoor evaporation mechanism 170. It includes an indoor heat exchanger drain pan 181 that collects condensed water generated in the indoor heat exchanger 162, an outdoor evaporation drain pan 182 located below the outdoor heat exchanger 164, and an outdoor evaporation water conduit 183 that guides condensed water in the indoor heat exchanger drain pan 181 to the outdoor evaporation drain pan 182. It also includes an outdoor evaporation filter material 184 whose lower end contacts the outdoor evaporation drain pan 182 and whose upper end faces the air passage of the outdoor heat exchanger 164. Like the indoor evaporation filter material 174, the outdoor evaporation filter material 184 is made of a highly absorbent material and also has antibacterial and antifungal properties. The outdoor evaporation filter material 184 is also held in place by a filter material frame 185, increasing its rigidity.

[0025] As described above, the room air blower 130 is connected to the room exhaust duct 123. The outside air blower 140 is disposed in the outside air introduction duct 120. The room air blower 130 and the outside air blower 140 basically have the same structure. An example of the room air blower 130 will be described using FIG. 6. A motor is disposed inside the cylindrical sirocco fan 131. The rotation of the motor output shaft 132 is transmitted to the sirocco fan 131, and the sirocco fan 131 rotates inside the scroll casing 133. The room air RA that flows into the scroll casing 133 through the intake port opened on the right side of FIG. 6 is rectified inside the scroll casing 133 and blown out from the blower outlet 134.

[0026] Similarly, the outside air blower 140 includes a sirocco fan 131 and a scroll casing 133. The inside air blower 130 is disposed outside the indoor exhaust port 113 side of the air conditioning case 110, whereas the outside air blower 140 is disposed inside the outside air introduction duct 120. However, both the inside air blower 130 and the outside air blower 140 are disposed outside the air conditioning case 110. In other words, the inside air blower 130 and the outside air blower 140 are not disposed inside the air conditioning case 110, but are configured separately from the air conditioning case 110. This increases the degree of freedom in the installation location of the inside air blower 130 and the outside air blower 140.

[0027] Next, the operation of the ventilating air-conditioning system 100 configured as described above will be described. The indoor air blower 130 and the outdoor air blower 140 operate all year round, and the ventilating air-conditioning system 100 is constantly ventilating. The ventilation air volume is, for example, about 200 to 300 cubic meters per hour. In a typical building 200, ventilation of the indoor air is completed in about two hours. During ventilation, sensible and latent heat is exchanged between the indoor air RA and the outdoor air OA in the total heat exchanger 150. The total heat exchanger 150 exchanges heat with a heat exchange efficiency of 50 percent or more; for example, when the heat exchange efficiency is 90 percent, heat is exchanged so as to reduce the temperature difference between the indoor air RA and the outdoor air OA.

[0028] In this state, we will first explain the situation in which cooling is required in summer. There are rooms in the building 200 where room air conditioners 210 are installed, and in the living-dining-kitchen room 204 where cooling is particularly required, the room air conditioner 210 is operated in cooling mode. The ventilating air-conditioning system 100 also sets the four-way valve 161 to cooling flow and starts operating the compressor 160. High-temperature, high-pressure gas refrigerant discharged from the compressor 160 flows from the four-way valve 161 into the outdoor heat exchanger 164. Room air RA drawn from the air-conditioned space 220 by the indoor air blower 130 flows through the outdoor heat exchanger 164. In summer, the room air RA in the air-conditioned space 220 is lower in temperature than the outdoor air OA. Heat exchange with the outdoor air OA in the total heat exchanger 150 causes the temperature of the outdoor air OA to decrease and the temperature of the room air RA to increase. In this way, although the temperature of the room air RA is raised above the air temperature in the air-conditioned space 220 by the total heat exchanger 150, the room air RA flowing into the outdoor heat exchanger 164 is still at a lower temperature than the outside air OA.

[0029] If the temperature of the gas refrigerant in the outdoor heat exchanger 164 is, for example, 60°C and the temperature of the room air RA is, for example, 28°C, the refrigerant is cooled and condensed into high-pressure liquid refrigerant through heat exchange between the gas refrigerant and the room air RA. Next, when passing through the electric expansion valve 163, the high-pressure liquid refrigerant undergoes adiabatic expansion and becomes a low-pressure, low-temperature, mist-like liquid refrigerant. This mist-like liquid refrigerant flows into the indoor heat exchanger 162. Outside air OA from outside the building 200 is blown into the indoor heat exchanger 162 by the outside air blower 140. More specifically, the outside air OA that has exchanged heat in the total heat exchanger 150 exchanges heat with the liquid refrigerant in the indoor heat exchanger 162. For example, if the temperature of the low-pressure liquid refrigerant is 5°C and the temperature of the outside air OA after passing through the total heat exchanger 150 is 30°C, the liquid refrigerant evaporates due to the heat of the outside air OA. The outside air OA passing through the indoor heat exchanger 162 is cooled by the heat of vaporization during evaporation, and when the temperature reaches, for example, about 15 degrees, it is ejected from the indoor outlet 112 toward the air-conditioned space 220. The refrigerant that has passed through the indoor heat exchanger 162 is then sucked into the compressor via the four-way valve 161.

[0030] As the outdoor air OA passes through the indoor heat exchanger 162, it is cooled from, for example, 30°C to 15°C, causing moisture contained in the outdoor air OA to condense on the surface of the indoor heat exchanger 162, forming condensed water. This condensed water is evaporated by the outdoor evaporation mechanism 180. As described with reference to FIG. 5 , the condensed water drips into the indoor heat exchanger drain pan 181, accumulates therein, and then flows through the outdoor evaporation water conduit 183 to the outdoor evaporation drain pan 182. The condensed water that flows into the outdoor evaporation drain pan 182 is sucked up by capillary action in the outdoor evaporation filter media 184. As described above, because a high-temperature, high-pressure gas refrigerant at, for example, 70°C flows through the outdoor heat exchanger 164, the indoor air RA that has passed through the outdoor heat exchanger 164 has its temperature increased to, for example, about 40°C. Therefore, the heated indoor air RA evaporates the condensed water that has been sucked up by capillary action into the outdoor evaporation filter material 184. In this way, the condensed water generated inside the air conditioning case 110 evaporates in the air conditioning case 110 and is exhausted to the outside of the building 200 together with the indoor air RA.

[0031] During periods of low air conditioning load, such as spring and autumn, the compressor 160 stops operating. However, as described above, the outdoor air blower 140 and the indoor air blower 130 are constantly operating. Therefore, the indoor air RA in the air-conditioned space 220 is exhausted to the outside of the building 200, and fresh outdoor air OA from outside the building 200 is introduced into the air-conditioned space 220. As described above, the indoor air RA and the outdoor air OA undergo heat exchange of sensible heat and latent heat in the total heat exchanger 150.

[0032] In winter, when heating is required, the room air conditioner 210 performs heating operation, and the ventilating air-conditioning system 100 also starts heating operation. In heating operation, the four-way valve 161 is set to the heating flow, and the compressor 160 starts operating. In heating operation, high-temperature, high-pressure gas refrigerant flows into the indoor heat exchanger 162 through the four-way valve 161. Outdoor air OA is introduced into the indoor heat exchanger 162 by the outdoor air blower 140. For example, if the temperature of the outdoor air OA is 5°C and the temperature of the indoor air RA in the air-conditioned space 220 is 20°C, the outdoor air OA after heat exchange in the total heat exchanger 150 is heated to about 10°C and flows into the indoor heat exchanger 162. If the high-pressure gas refrigerant is at 70°C, the outdoor air OA after heat exchange in the indoor heat exchanger 162 is heated to about 40°C. This heated outdoor air OA is blown out from the indoor air outlet 112 into the air-conditioned space 220.

[0033] The liquid refrigerant that has passed through the indoor heat exchanger 162 and condensed is adiabatically expanded in the electric expansion valve 163, becoming a low-temperature, low-pressure atomized liquid refrigerant and flowing into the outdoor heat exchanger 164. In the outdoor heat exchanger 164, heat is exchanged with the indoor air RA exhausted from the air-conditioned space 220 by the indoor air blower 130. Specifically, heat is exchanged with the indoor air RA after heat exchange in the total heat exchanger 150. In the above example, when the temperature of the indoor air RA is 20°C and the temperature of the outdoor air OA is 5°C, the temperature of the indoor air RA after heat exchange in the total heat exchanger 150 is cooled to about 15°C. However, because the indoor air RA contains a sufficient amount of heat to evaporate the low-temperature liquid refrigerant in the outdoor heat exchanger 164, the refrigerant that has passed through the outdoor heat exchanger 164 becomes a gas refrigerant. Next, the refrigerant is drawn into the suction port of the compressor 160 via the four-way valve 161.

[0034] Meanwhile, heat is removed from the indoor air RA in the outdoor heat exchanger 164, and moisture in the indoor air RA condenses on the surface of the outdoor heat exchanger 164. This condensed water is evaporated by the indoor evaporation mechanism 170. The configuration of the indoor evaporation mechanism 170 is the same as that of the outdoor evaporation mechanism 180 described above. Briefly, the condensed water generated in the outdoor heat exchanger 164 flows through the outdoor heat exchanger drain pan 171 and the indoor evaporation water conduit 173 to the indoor evaporation drain pan 172. The condensed water is then sucked up by the indoor evaporation filter medium 174 and evaporated by the outdoor air OA that has passed through the indoor heat exchanger 162. The evaporated moisture is blown out, together with the outdoor air OA, from the indoor air outlet 112 toward the air-conditioned space 220. This enables humidification in addition to heating in winter.

[0035] In cold regions where the temperature of the outdoor air OA is particularly low, moisture that has condensed on the surface of the outdoor heat exchanger 164 may further cool and turn into frost. If frost forms on the outdoor heat exchanger 164, it becomes difficult for the indoor air RA to pass through the outdoor heat exchanger 164, reducing the heat exchange efficiency of the outdoor heat exchanger 164 and ultimately causing a decrease in the performance of the ventilating air-conditioning system 100. Therefore, if frost forms on the outdoor heat exchanger 164, a defrosting operation is performed.

[0036] Defrosting operation is performed by switching the four-way valve 161 to the cooling flow described above. However, because this reverses the refrigerant flow, the compressor 160 is stopped and allowed to stand for at least three minutes until the refrigerant pressures are equalized between the indoor heat exchanger 162 and the outdoor heat exchanger 164, after which the four-way valve 161 is switched to the cooling flow. After this, the compressor 160 is started, and high-temperature, high-pressure gas refrigerant compressed by the compressor 160 flows into the outdoor heat exchanger 164. This high-temperature, high-pressure gas refrigerant raises the temperature of the outdoor heat exchanger 164, melting any ice adhering to the outdoor heat exchanger 164. The melted moisture flows from the outdoor heat exchanger drain pan 171 through the indoor evaporation conduit 173 to the indoor evaporation drain pan 172, where it accumulates. The accumulated moisture is evaporated by the indoor evaporation mechanism 170 during heating operation.

[0037] However, as described above, it takes time to switch from heating operation to defrosting operation, and the defrosting operation also takes time. Furthermore, when switching from defrosting operation back to heating operation, it takes time for the refrigerant pressure to be equalized. This time, for example, takes about 10 minutes. Note that about 10 minutes is a short time for a defrosting operation. This is because, in this example, all of the equipment constituting the refrigeration cycle, such as the compressor 160, is housed inside the air conditioning case 110, so the time required for refrigerant pressure equalization can be shortened. However, even if it is only for a short time, the ventilating air-conditioning system 100 cannot perform ventilation during this defrosting operation. For this reason, it is desirable to avoid the defrosting operation as much as possible.

[0038] In Fig. 7, side bypass paths 155 are formed in the total heat exchanger 150 to allow the room air RA to pass on both side surfaces (top and bottom sides in Fig. 7) of the room air passage 1531. The side bypass paths 155 communicate with a total heat exchanger bypass path 156. The total heat exchanger bypass path 156 opens to about 40% of the outdoor air passage 1532 of the total heat exchanger 150 on the outdoor heat exchanger 164 side. As a result, the room air RA flowing along the side of the total heat exchanger 150 flows from the side bypass path 155 to the total heat exchanger bypass path 156 of the total heat exchanger 150. In other words, the outdoor air OA flows into about 60% of the outdoor air passage 1532 of the total heat exchanger 150 on the left side in Fig. 7. Furthermore, the room air RA from the total heat exchanger bypass path 156 flows into about 40% of the outdoor air passage 1532 on the right side in Fig. 7, even though it is the outdoor air passage 1532.

[0039] FIG. 8 is a plan view of FIG. 7 as viewed from direction VIII, and FIG. 9 is a front view of FIG. 7 as viewed from direction IX. As shown in FIGS. 7 to 9, the entire amount of room air RA passes through the room air passage 1531 and flows into the outdoor heat exchanger 164. In contrast, the outdoor air OA flows through approximately 60% of the total heat exchanger 150, which is upstream of the room air RA. The room air RA flows through approximately 40% of the total heat exchanger 150, close to the outdoor heat exchanger 164. This prevents the temperature of the outdoor heat exchanger 164 from becoming extremely low, especially when the temperature of the outdoor air OA becomes low. For example, even if the temperature of the outdoor air OA is minus 10 degrees, if the temperature of the room air RA is 20 degrees and is heat exchanged in the total heat exchanger 150, the temperature of the outdoor heat exchanger 164 will not become negative. As a result, frost formation on the outdoor heat exchanger 164 during heating operation in winter can be effectively prevented. As described above, ventilation is not possible during defrosting operation. In contrast, simply providing the side bypass path 155 and the total heat exchange bypass path 156 makes it possible to perform ventilation at all times.

[0040] Note that the room air RA flows through the side bypass path 155 and the total heat exchanger bypass path 156 even during cooling in the summer. Therefore, during cooling, approximately 60% of the air flow through the indoor heat exchanger 162 is outdoor air OA, and the remaining 40% is indoor air RA. However, because the room air RA is lower in temperature than the outdoor air OA during cooling, the cooling capacity is not reduced. Furthermore, during cooling, the room air RA flows upstream of the outdoor heat exchanger 164. Because this room air RA is also lower in temperature than the outdoor air OA, it contributes to cooling the outdoor heat exchanger 164. Therefore, the room air RA flowing through the side bypass path 155 and the total heat exchanger bypass path 156 contributes to improving the cooling capacity. In this way, using outdoor air OA to account for approximately 60% of the air flow through the outdoor air passage 1532 of the total heat exchanger 150 and indoor air RA to account for the remaining 40% is desirable not only during defrosting operation but also during cooling and heating operation. However, setting the air volume of the outside air OA at about 60% is just an example, and the ratio of the outside air OA to the inside air RA can be set appropriately depending on the usage environment, etc. For example, the amount of the inside air RA may be increased for cold climate specifications where the temperature of the outside air OA is lower. Also, to promote heat exchange in the total heat exchanger 150, the air volume of the outside air OA flowing through the outside air passage 1532 may be increased.

[0041] An example in which a total heat exchanger 150 equipped with a side bypass path 155 and a total heat exchange bypass path 156 shown in Fig. 7 is incorporated into an air conditioning case 110 will be described with reference to Fig. 10. In the example of Fig. 2, the inside air blower 130 and the outside air blower 140 are disposed upstream of the air conditioning case 110 and are of the push type. In contrast, in the example of Fig. 10, the inside air blower 130 and the outside air blower 140 are disposed downstream of the air conditioning case 110 and are of the suction type. Also, in the example of Fig. 10, a partition wall 115 that contacts the frame 151 of the total heat exchanger 150 is disposed inside the air conditioning case 110 to separate the inside air RA from the outside air OA.

[0042] As described above, the air conditioning case 110 has a vertical length H and horizontal length of approximately 45 centimeters, and a depth of approximately 70 centimeters. As shown in FIG. 11 , it has a compact shape. Note that FIG. 11 shows the indoor exhaust duct 123, the outdoor exhaust duct 124, the outdoor air intake duct 120, and the outdoor air outlet duct 122 connected to it. However, when actually passing the air conditioning case 110 through an inspection hatch, the ducts are removed to make it easier to pass through the inspection hatch. The air conditioning case 110 shown in FIGS. 10 and 11 has a small vertical length H and horizontal length, making it effective for installation in places with limited height, such as the attic 201 or under the floor between floors.

[0043] 10 also shows an electrical equipment box 166. An air conditioning controller is disposed inside the electrical equipment box 166, and inputs to the air conditioning controller include temperature signals from an inside air sensor 167 (shown in FIG. 1) and an outside air sensor 168, humidity signals from a humidity sensor (not shown), and setting signals from a remote control 211. Based on the various input signals, the air conditioning controller switches between cooling operation, heating operation, and ventilation-only operation (neither cooling nor heating). The air conditioning controller also controls the rotation speeds of the inside air blower 130 and the outside air blower 140 to switch the airflow.

[0044] In the examples shown in FIGS. 10 and 11 , the compressor 160 and the electrical box 166 are arranged horizontally to the side of the total heat exchanger 150 in order to reduce the vertical length H of the air conditioning case 110. In contrast, as in the examples shown in FIGS. 12 and 13 , the compressor 160 and the electrical box 166 may be arranged vertically below the total heat exchanger 150. The examples shown in FIGS. 12 and 13 are suitable for placing the air conditioning case 110 inside a machine room 202 or a wall. The size of the air conditioning case 110 is approximately 45 centimeters in width L and depth, and approximately 70 centimeters in length. However, approximately 70 centimeters is just an example, and the case may be longer or shorter. Furthermore, as described above, the air conditioning case 110 may have a cubic shape with a side length of approximately 45 centimeters.

[0045] FIG. 14 shows an improved example of the indoor evaporation mechanism 170 and the outdoor evaporation mechanism 180. Compared to the example shown in FIG. 5, an emergency pipe 177 has been added, connecting the indoor evaporation drain pan 172 and the outdoor evaporation drain pan 182. The emergency pipe 177 is a pipe for discharging condensed water in an emergency when the amount of condensed water becomes particularly large. In the example shown in FIG. 5, the outlet of the indoor evaporation water conduit 173 opens below the indoor evaporation drain pan 172, and the outlet of the outdoor evaporation water conduit 183 opens below the outdoor evaporation drain pan 182. In contrast, both ends of this emergency pipe 177 open above the indoor evaporation drain pan 172 and the outdoor evaporation drain pan 182.

[0046] The example in Figure 14 shows cooling mode, in which the indoor heat exchanger 162 is used for cooling. As shown on the left side of Figure 14, condensed water flows from the indoor heat exchanger drain pan 181 through the outdoor evaporation water conduit 183 into the outdoor evaporation drain pan 182. If the amount of condensed water generated is greater than the amount of water evaporated by the outdoor evaporation filter material 184, the condensed water may overflow from the outdoor evaporation drain pan 182, as shown on the left side of Figure 14. Therefore, excess condensed water accumulated in the outdoor evaporation drain pan 182 is diverted to the indoor evaporation drain pan 172 via the emergency pipe 177. The condensed water that flows into the indoor evaporation drain pan 172 through the emergency pipe 177 is evaporated by the indoor evaporation filter material 174. Although the indoor evaporation filter material 174 is exposed to cool air during cooling mode, excess condensed water can still evaporate. Furthermore, evaporation in the indoor evaporation filter medium 174 results in humidification during cooling, but this is excess condensed water, and the amount of humidification is not large, so it does not interfere with cooling operation.

[0047] If the humidity of the outdoor air OA is high, a large amount of condensed water may be generated in the indoor heat exchanger 162 during cooling operation. In that case, as described above, there is a risk that the condensed water may overflow from the outdoor evaporation drain pan 182. In that case, if the emergency pipe 177 is not provided, the cooling operation must be stopped to prevent the condensed water from overflowing. In contrast, if the emergency pipe 177 is provided, the overflow of condensed water can be effectively prevented. This makes it possible to continue cooling operation even when a large amount of condensed water is generated.

[0048] FIG. 15 shows another example of the indoor evaporation mechanism 170 and the outdoor evaporation mechanism 180. In this example of FIG. 15, the indoor heat exchanger drain pan 181 also serves as the indoor evaporation drain pan 172. The outdoor heat exchanger drain pan 171 also serves as the outdoor evaporation drain pan 182. Hereinafter, they will be referred to as the indoor evaporation drain pan 172 and the outdoor evaporation drain pan 182. The indoor evaporation filter material 174 is disposed so that its lower end is slightly below the upper end of the indoor evaporation drain pan 172. Similarly, the outdoor evaporation filter material 184 is disposed so that its lower end is slightly below the upper end of the outdoor evaporation drain pan 182. The indoor evaporation water conduit 173 and the outdoor evaporation water conduit 183 are not used. Instead, a part of the indoor evaporation filter material 174 serves as the indoor evaporation water absorption section 178. The indoor evaporation water absorption portion 178 extends from the indoor evaporation filter material 174, and its tip contacts the lower end of the outdoor evaporation drain pan 182. The same is true for the outdoor evaporation filter material 184. A part of it becomes the outdoor evaporation water absorption portion 188, and the tip of the outdoor evaporation water absorption portion 188 contacts the lower end of the outdoor evaporation drain pan 182.

[0049] The example in Figure 15 shows a cooling operation in which the indoor heat exchanger 162 cools the outdoor air. During this cooling operation, condensed water condensed on the surface of the indoor heat exchanger 162 drips into the indoor evaporation drain pan 172. The outdoor evaporation water absorption section 188 then sucks the condensed water up into the outdoor evaporation filter material 184, where it evaporates with the warm air that has passed through the outdoor heat exchanger 164. If the condensation in the indoor heat exchanger 162 is greater than the evaporation in the outdoor evaporation filter material 184, the condensed water accumulates in the indoor evaporation drain pan 172, and the water level rises. As the water level rises, when the surface of the condensed water in the indoor evaporation drain pan 172 comes into contact with the lower end of the indoor evaporation filter material 174, the condensed water then evaporates not only from the outdoor evaporation filter material 184 but also from the indoor evaporation filter material 174. This prevents the condensed water from overflowing from the indoor evaporation drain pan 172.

[0050] 14 and 15 have been described in terms of cooling operation using the indoor heat exchanger 162 for cooling, but evaporation of condensed water occurs in a similar manner in heating operation. During heating operation, the outdoor heat exchanger 164 is used for cooling, so condensed water is generated on the surface of the outdoor heat exchanger 164. First, the indoor evaporation mechanism 170 evaporates the condensed water, and when the amount of condensed water generated is particularly large, evaporation by the outdoor evaporation mechanism 180 also takes place.

[0051] In the example of FIG. 2, the outdoor evaporative mechanism 180 is disposed downstream of the outdoor heat exchanger 164 in the flow direction of the room air RA. During cooling, the room air RA warmed by the outdoor heat exchanger 164 hits the indoor evaporative filter medium 184, allowing a large amount of condensed water to evaporate. However, as shown in FIG. 16, the outdoor evaporative mechanism 180 may be disposed upstream of the outdoor heat exchanger 164 in the flow direction of the room air RA. During cooling, the condensed water splashes onto the outdoor heat exchanger 164, cooling the outdoor heat exchanger 164. This improves the heat exchange efficiency of the outdoor heat exchanger 164. This ultimately increases the cooling capacity, allowing for more efficient cooling operation in summer.

[0052] As described above, in this example, the air conditioning case 110, the inside air blower 130, and the outside air blower 140 are formed separately. This allows for greater flexibility in installing the air conditioning case 110 relative to the building 200. FIG. 17 shows an installation example. (A) in FIG. 17 is a comparative example, in which the inside air blower 130 and the outside air blower 140 are arranged inside the air conditioning case 110 disclosed in Patent Documents 1 and 2. In the example (A), the air conditioning case 110 becomes larger, and a drain hose 230 is required to distribute condensed water to the outside of the building 200.

[0053] FIG. 7(B) shows an example in which the air conditioning case 110 of this example is placed in the attic 201 of the building 200. FIG. 7(C) shows an example in which the air conditioning case 110 of this example is placed under the floor 215 of the building 200. FIG. 7(D) shows an example in which the air conditioning case 110 of this example is placed between floors or in the dropped ceiling 216 of the building 200. And FIG. 7(E) shows an example in which the air conditioning case 110 of this example is embedded in the wall of the building 200.

[0054] Described above are desirable examples of the ventilating air-conditioning system 100 of the present disclosure, but a feature of the present disclosure is that the indoor evaporative mechanism 170 and the outdoor evaporative mechanism 180 are disposed inside the air-conditioning case 110, eliminating the need for a drain hose 230 that distributes condensed water to the outside of the building 200. Therefore, it is possible to dispose either or both of the indoor air blower 130 and the outdoor air blower 140 inside the air-conditioning case 110 as needed. Conversely, it is also possible to dispose the compressor 160, four-way valve 161, and electrical box 166, which were disposed inside the air-conditioning case 110 in the above example, outside the air-conditioning case 110.

[0055] In the above-described example, the indoor evaporative mechanism 170 and the outdoor evaporative mechanism 180 use gravity to direct condensed water to the indoor evaporative water conduit 173 and the outdoor evaporative water conduit 183. This is a desirable example because it does not require any special power. However, a motor-driven pump can be used if necessary. By using a pump to send condensed water to the indoor evaporative drain pan 172 and the outdoor evaporative drain pan 182, the flexibility in the placement of the indoor heat exchanger 162 and the outdoor heat exchanger 164 can be increased. In the above-described example, the capillary action of the indoor evaporative filter media 174 is used to draw condensed water up to the indoor evaporative filter media 174. Similarly, the outdoor evaporative mechanism 180 also uses the capillary action of the outdoor evaporative filter media 184 to draw condensed water. This too may be a motor-driven pump. Using a pump makes it possible to spray condensed water onto the optimal location of the indoor evaporative filter media 174 and the outdoor evaporative filter media 184.

[0056] The outdoor evaporation mechanism 180 in the present disclosure serves as an outdoor evaporation water absorption mechanism that absorbs condensed water accumulated in drain pans 181, 182 that accumulate condensed water generated in the indoor heat exchanger 162, toward the outdoor evaporation filter material 184. This water absorption mechanism includes the outdoor evaporation water conduit 183 and outdoor evaporation water absorption section 188 described above, and also includes a pump. This is similar to the indoor evaporation mechanism 170. The indoor evaporation mechanism 170 also serves as an outdoor evaporation water absorption mechanism that absorbs condensed water accumulated in drain pans 171, 172 that accumulate condensed water generated in the outdoor heat exchanger 164, toward the indoor evaporation filter material 174. This water absorption mechanism includes the indoor evaporation water conduit 173, the indoor evaporation water absorption section 178, and a pump.

[0057] In the above example, both the indoor evaporative mechanism 170 and the outdoor evaporative mechanism 180 are located within the air conditioning case 110. This is a desirable example because it ensures reliable treatment of condensed water during both cooling and heating operation. However, if necessary, it is possible to eliminate the indoor evaporative mechanism 170 and use only the outdoor evaporative mechanism 180. Even if only the outdoor evaporative mechanism 180 is used, condensed water is generated in the indoor heat exchanger 162 during cooling operation, so the condensed water can be treated by the outdoor evaporative mechanism 180. Although condensed water is generated in the outdoor heat exchanger 164 during heating operation, the amount of condensed water generated during heating operation is smaller than the amount of condensed water generated during cooling operation. Therefore, condensed water generated in the outdoor heat exchanger 164 can be stored in the outdoor evaporative drain pan 182. Small amounts of condensed water can also be evaporated by the outdoor evaporative filter media 184 of the outdoor evaporative mechanism 180. [Explanation of symbols]

[0058] 100 Ventilation and air conditioning equipment 110 Air Conditioning Case 130 Internal air blower 140 Fresh air blower 150 Total heat exchanger (1st heat exchanger) 162 Indoor heat exchanger 164 Outdoor heat exchanger 170 Indoor evaporation mechanism 180 Outdoor evaporation mechanism

Claims

1. A ventilation and air conditioning device (100) that ventilates and air-conditions an air-conditioned space of a building, an air conditioning case (110) including an outdoor inlet (111) for introducing outside air, which is air outside the building; an indoor outlet (112) for blowing outside air toward the air-conditioned space of the building; an indoor exhaust outlet (113) for introducing inside air, which is air inside the air-conditioned space of the building; and an outdoor exhaust outlet (114) for exhausting the inside air to the outside of the building; a first heat exchanger (150) disposed in the air conditioning case and performing heat exchange between outside air flowing from the outdoor inlet to the indoor outlet and inside air flowing from the indoor outlet to the outdoor outlet; an indoor heat exchanger (162) that is disposed in the air conditioning case closer to the indoor air outlet than the first heat exchanger in the flow direction of the outdoor air and exchanges heat with the outdoor air that has passed through the first heat exchanger; an outdoor heat exchanger (164) that is disposed in the air conditioning case closer to the outdoor exhaust port than the first heat exchanger in the flow direction of the indoor air and exchanges heat with the indoor air that has passed through the first heat exchanger; an outdoor evaporation mechanism (180) disposed in the air conditioning case for evaporating condensed water generated in the indoor heat exchanger by heat from the outdoor heat exchanger; a compressor (160) for sucking, compressing, and discharging a refrigerant; a four-way valve (161) for switching between a cooling flow in which a refrigerant is drawn from the indoor heat exchanger into the compressor and the refrigerant compressed by the compressor is discharged to the outdoor heat exchanger, and a heating flow in which a refrigerant is drawn from the outdoor heat exchanger into the compressor and the refrigerant compressed by the compressor is discharged to the indoor heat exchanger; an expander (163) disposed between the indoor heat exchanger and the outdoor heat exchanger and decompressing the refrigerant; a refrigerant pipe (165) connecting the indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve, and the expander; an outside air blower (140) that blows outside air from the outside inlet of the air conditioning case to the inside outlet; an indoor air blower (130) that blows indoor air from the indoor exhaust port of the air conditioning case to the outdoor exhaust port; A ventilation and air conditioning device equipped with:

2. The ventilating air-conditioning system according to claim 1, further comprising: An indoor evaporation mechanism (170) disposed in the air conditioning case for evaporating condensed water generated in the outdoor heat exchanger by heat from the indoor heat exchanger. A ventilation and air conditioning device equipped with:

3. The outdoor evaporation mechanism includes a drain pan that collects condensed water generated in the indoor heat exchanger, a water-absorbent outdoor evaporation filter material facing the outdoor heat exchanger, and an outdoor evaporation water absorption mechanism that absorbs the condensed water collected in the drain pan into the outdoor evaporation filter material, The indoor evaporation mechanism includes a drain pan that collects condensed water generated in the outdoor heat exchanger, a water-absorbent indoor evaporation filter facing the indoor heat exchanger, and an indoor evaporation water absorption mechanism that absorbs the condensed water collected in the drain pan into the indoor evaporation filter. The ventilating air-conditioning system according to claim 2.

4. The outdoor evaporation mechanism includes an indoor heat exchanger drain pan that is disposed vertically below the indoor heat exchanger and receives condensed water generated in the indoor heat exchanger, an outdoor evaporation drain pan that is disposed vertically below the indoor heat exchanger drain pan, an outdoor evaporation water conduit that conducts condensed water from the indoor heat exchanger drain pan to the outdoor evaporation drain pan, and a water-absorbent outdoor evaporation filter medium whose vertical lower end contacts the outdoor evaporation drain pan and whose upper end faces the outdoor heat exchanger, The indoor evaporation mechanism includes an outdoor heat exchanger drain pan that is disposed vertically below the outdoor heat exchanger and receives condensed water generated in the outdoor heat exchanger, an indoor evaporation drain pan that is disposed vertically below the outdoor heat exchanger drain pan, an indoor evaporation water conduit that guides condensed water from the outdoor heat exchanger drain pan to the indoor evaporation drain pan, and an absorbent indoor evaporation filter medium whose vertical lower end contacts the indoor evaporation drain pan and whose upper end faces the indoor heat exchanger. The ventilating air-conditioning system according to claim 2.

5. The outdoor evaporation filter material and the indoor evaporation filter material have antibacterial and antifungal properties. The ventilating air-conditioning system according to claim 3 or 4.

6. The outdoor evaporative mechanism is disposed upstream of the outdoor heat exchanger in the flow direction of outdoor air. The ventilating air-conditioning system according to claim 1.

7. The outdoor evaporative mechanism is disposed downstream of the outdoor heat exchanger in the flow direction of outdoor air. The ventilating air-conditioning system according to claim 1.

8. The indoor-side evaporative mechanism is disposed downstream of the indoor-side heat exchanger in the flow direction of the indoor air. The ventilating air-conditioning system according to claim 2.

9. the first heat exchanger is a total heat exchanger that exchanges sensible heat and latent heat between the outdoor air and the indoor air, with an outdoor air passage through which outdoor air flows from the outdoor inlet toward the indoor air outlet and an indoor air passage through which indoor air flows from the indoor exhaust port toward the outdoor exhaust port intersecting at right angles, The air conditioning case is provided with an inside air bypass path that allows inside air to flow through all of the inside air passages and that allows outside air to flow to the indoor exhaust port side of the outside air passage and allows inside air to flow to the outdoor heat exchanger side of the outside air passage. The ventilating air-conditioning system according to claim 1.

10. The outside air blower and the inside air blower are disposed outside the air conditioning case. The ventilating air-conditioning system according to claim 1.

11. The compressor, the four-way valve, the expander, and the refrigerant piping are disposed inside the air conditioning case. The ventilating air-conditioning system according to claim 1.

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