JP6619033B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner.

  The air conditioner shown in Patent Literature 1 has a configuration in which outside air and return air of air-conditioning air are separately heat-exchanged by two heat exchangers and then mixed and supplied to an air-conditioned space for cooling or heating. . This air conditioner can cool the outside air with sensible heat cooling energy by introducing the outside air into the room without exchanging heat of the air-conditioning air with the heat exchanger during an intermediate period when the outside air temperature is lower than the room temperature.

JP 2009-162411 A

  However, only the sensible heat cooling of the outside air has a problem that the cooling capacity is limited and the energy saving performance is inferior, and even if the temperature can be adjusted, the humidity becomes a problem and the comfort is inferior.

  In order to solve the above problems, the present invention adjusts the outside air, return air and other air-conditioning air to an air condition suitable for air-conditioning of the air-conditioned space and supplies the air-conditioned space to the air-conditioned space, and the operation of the air-conditioner An air conditioner control device that controls the outside air path through which the outside air of the air conditioning air passes, the return air path through which the return air of the air conditioning air passes, and the outside air path An outside air side heat exchanger that transfers heat of the heat exchange medium to the outside air, a return air side heat exchanger that transfers heat of the heat exchange medium to the return air of the return air path, and the outside air of the outside air path An outside air side vaporizing humidifier that humidifies by vaporization evaporation of water, and a return air side vaporization humidifier that humidifies the return air in the return air path by vaporization evaporation of water, and the air conditioner control device comprises: The outside air side vaporizing humidifier and the return air side air can be transferred to the air conditioning air without transferring heat of the heat exchange medium. The first evaporative cooling unit for evaporative cooling of the air-conditioning air by running one or both of formula humidifier, the most important feature in that it comprises.

According to the first aspect of the present invention, even in the intermediate period or winter season when the air conditioner is heated, when the air conditioner needs to be cooled by using solar radiation or a device that generates a large amount of heat, the air conditioner converts the air conditioning air into air conditioning air. Air conditioning air can be vaporized and cooled by operating one or both of the outside air-side humidifier and return air-side humidifier without transferring heat from the heat exchange medium. . In particular, since the water in the return-side vaporization humidifier is vaporized and evaporated by return air having a temperature higher than that of the outside air in the winter season, evaporative cooling is promoted, and the cooling capacity and the humidification capacity are improved. With the air conditioner, the heat exchange medium heat is not transferred to the air-conditioning air, and only one or both of the outside air and the return air are vaporized and cooled, and the mixed air volume is adjusted to return the outside air to the outside air and the return air path. The air state of the mixed air and the air is suitable for air conditioning of the air-conditioned space, that is, both the temperature and humidity of the mixed air can be controlled, and the comfort is excellent.

According to the invention of claim 2 , even in the intermediate period or winter season when the air conditioner is operated for heating, when the air conditioner needs to be cooled by using solar radiation or a device with a large amount of heat generation, Since the air for air conditioning can be vaporized and cooled by operating the return-side vaporizing humidifier without transferring heat from the heat exchange medium, the cooling capacity is large and energy saving is excellent. In particular, since the water of the return-side vaporization humidifier is vaporized and evaporated by return air having a temperature higher than that of the outside air in winter and the like, evaporative cooling is promoted, and cooling capacity and humidification capacity are improved.
During the intermediate period or low load, the air conditioner does not transfer the heat of the heat exchange medium to the air conditioning air, heating the air conditioning air with a steam humidifier, and the air conditioning air is vaporized with a vaporizing humidifier Cooling operation to be cooled can be freely selected and switched to save energy and improve comfort.

According to the invention of claim 3, since the cooling operation by evaporative cooling can be selected and switched even in the intermediate period or winter period in which the air conditioner is operated for heating, the heat exchange medium of the heat storage tank can be changed to a temperature range suitable for cooling and heating. There is no need to switch to a suitable temperature range frequently. Therefore, there is little energy loss and it becomes energy saving.

It is a simplified explanatory view showing the air conditioning apparatus of the present invention. It is a simplified explanatory view showing an air conditioner of the present invention. (Example 1) It is a simplified explanatory view of a heat exchanger. It is a simplified explanatory view showing another air conditioner of the present invention. (Example 2) It is a simplified explanatory view showing another air conditioner of the present invention. (Example 3) It is simplified explanatory drawing which shows another air conditioner of this invention. Example 4

  1 to 3 show an air conditioner of the present invention. This air conditioner controls the operation of the air conditioner 1 that supplies outside air, return air, and other air-conditioning air to an air-conditioned space S after adjusting the air condition to the air-conditioned space S and the air-conditioned space S. The air conditioner control device 2, the heat storage tank 3 for storing water, aqueous solution and other heat exchange media, the temperature of the heat exchange medium is adjusted and the temperature range suitable for the cooling operation of the air conditioner and the air conditioner A heat source device 4 that switches to a temperature range suitable for heating operation and a circulation device 5 that circulates a heat exchange medium between the heat source device 4 and the air conditioner 1 are provided.

  The air conditioner 1 is connected to the outside and a space to be air-conditioned S such as a room or a hall of a building by a duct (not shown). The outdoor outside air (OA) and the return air (RA) of the air-conditioned space S are introduced into the air conditioner 1 as air-conditioning air, and the air-conditioned air S is supplied from the air-conditioner 1 as air-conditioning air (SA). To supply. In each figure, the solid arrows indicate the airflow direction.

  The circulation device 5 includes a circulation line 6 configured to circulate the heat exchange medium with respect to the air conditioner 1 and the heat storage tank 3, and a pump 7 that sends the heat exchange medium. For example, the heat source device 4 is operated at night to accumulate a heat exchange medium in the heat storage tank 3 and used for the operation of the air conditioner 1.

  The air conditioner 1 includes an outside air path 8 through which the outside air of the air conditioning air passes, a return air path 9 through which the return air of the air conditioning air passes, and an outside air side heat exchanger that transfers the heat of the heat exchange medium to the outside air of the air conditioning air. 10, a return air side heat exchanger 11 that transfers heat of the heat exchange medium to the return air of the air-conditioning air, an outside air side vaporizing humidifier 12 that humidifies the outside air in the outside air path 8 by evaporation of water, and a return A return-side vaporization humidifier 13 that humidifies the return air in the air passage 9 by vaporization and evaporation of water, a first pipe 14, a second pipe 15, a first flow rate adjustment valve 16, and a second flow rate adjustment. A valve 17, a blower 18, an air volume adjusting device 19 that adjusts the outside air volume of the outside air path 8 and the return air volume of the return air path 9, and a casing 20 are provided.

  The air volume adjusting device 19 includes an outside air damper 21 and a return air damper 22. In the illustrated example, the outside air path 8, the return air path 9, the outside air side heat exchanger 10, the return air side heat exchanger 11, the outside air side vaporizing humidifier 12, the return air side vaporizing humidifier 13, and the blower 18 are casing 20. The air conditioner control device 2, the first pipeline 14, the second pipeline 15, the first flow rate adjustment valve 16, the second flow rate adjustment valve 17, and the air volume adjustment device 19 are also provided in the casing 20. Also good.

  The outside air side heat exchanger 10 performs the 1st process which cools or heats the outside air of the air for air conditioning by distribution | circulation of a heat exchange medium. The return air side heat exchanger 11 performs a second process of cooling or heating the return air of the air-conditioning air by circulation of the heat exchange medium. The first pipe line 14 is configured by providing a pipe so that the heat exchange medium is circulated through the outside air side heat exchanger 10 and then continuously circulated through the return air side heat exchanger 11. The second pipe line 15 is configured by providing a pipe so as to branch off from the first pipe line 14 and bypass the heat exchange medium after the first treatment without passing through the return air side heat exchanger 11.

  The first flow rate adjustment valve 16 is provided in the middle of the first pipeline 14 and upstream of the second flow rate adjustment valve 17, and the second flow rate adjustment valve 17 is upstream of the return air side heat exchanger 11. It is provided at a branch portion between the first pipe line 14 and the second pipe line 15. The first flow rate adjustment valve 16 is configured by a proportionally controlled two-way valve so as to adjust the flow rate of the heat exchange medium before the first process to adjust the first process capability of the outside air heat exchanger 10. The second flow rate adjusting valve 17 adjusts the second processing capability of the return air side heat exchanger 11 by changing the distribution of the flow rate of the heat exchange medium in the first pipe line 14 and the second pipe line 15. It consists of a proportional control three-way valve. The second flow rate adjusting valve 17 may be constituted by a three-way valve having only a mechanism for switching so that the entire amount flows in one of the first conduit 14 and the second conduit 15 and the other does not flow. In addition, you may comprise the 1st flow regulating valve 16 and the 2nd flow regulating valve 17 other than a two-way valve or a three-way valve.

  The outside air-side humidifier 12 is provided on the lee of the outside-air heat exchanger 10, and the return air-side humidifier 13 is provided on the lee of the return-air side heat exchanger 11. The outside air damper 21 increases or decreases the outside air volume of the air-conditioning air for performing the first process. The return air damper 22 adjusts the return air volume of the air-conditioning air for performing the second process. The outside air of the air-conditioning air passes through the outside air damper 21, the outside air-side heat exchanger 10 and the outside air-side vaporizing humidifier 12, and the return air of the air-conditioning air is the return air damper 22, the return air-side heat exchanger 11 and the return air side. The vaporized humidifier 13 passes through and the mixed air of outside air and return air is supplied to the air-conditioned space S by the blower 18.

  As shown in FIG. 3, the outdoor air side heat exchanger 10 is configured by inserting a group of heat transfer tubes 26 into a group of heat transfer plates 25 in the same manner as a known plate fin coil. A cold water or hot water heat exchange medium is caused to flow inside the heat transfer tube 26, and the air conditioning air is brought into contact with the heat transfer tube 26 and the heat transfer plate 25, whereby the air conditioning air and the heat exchange medium are heat-exchanged. Cool or heat. The return air side heat exchanger 11 is configured in the same manner as the outside air side heat exchanger 10.

  The air conditioner control device 2 includes a first flow rate adjustment valve 16, a second flow rate adjustment valve 17, an outside air side vaporizing humidifier 12, a return air side vaporizing humidifier 13, according to fluctuations in the air conditioning load of the air-conditioned space S, The operation of the outside air damper 21, the return air damper 22, and the blower 18 is controlled to adjust the air for air conditioning to an air state (temperature and humidity) suitable for air conditioning of the air-conditioned space S.

  The air conditioner control device 2 includes an air condition detection unit 27 that detects the temperature and humidity of air-conditioning air, a setting unit 28, a first air conditioning capability control unit 29, an air conditioning capability compensation unit 30, and a first evaporative cooling unit. 31 and an outside air cooling control unit 32. The air state detection unit 27 includes an outside air sensor 33 that detects the temperature and humidity of the outside air in the outside air passage 8, a return air sensor 34 that detects the temperature and humidity of the return air in the return air passage 9, and a mixture of outside air and return air. An air supply sensor 35 that detects the temperature and humidity of the air supply to the air-conditioned space S, which is air. The setting unit 28 sets the set temperature and set humidity of the air conditioning target of the air-conditioned space S. The air conditioner control device 2 includes a microprocessor, various sensors, and other control devices.

  The first air conditioning capability control unit 29 operates the first flow rate adjustment valve 16 and the second flow rate adjustment valve 17 to distribute the heat exchange medium to both the outside air side heat exchanger 10 and the return air side heat exchanger 11. A control for changing the flow rate and a control for changing the flow rate while operating the first flow rate adjustment valve 16 and the second flow rate adjustment valve 17 to flow the heat exchange medium only to the outside air heat exchanger 10. Switching is performed according to a change in the air conditioning load of the air conditioned space S. For example, if the capacity to cool or heat the air-conditioned space S is insufficient even if only the first process of the outside air side heat exchanger 10 is performed, the second process of the return air side heat exchanger 11 is used together to reduce the capacity. Can be supplemented.

  Thus, according to the fluctuation of the air conditioning load in the air-conditioned space S, the air for air conditioning can be finely adjusted to an air state suitable for air conditioning with high accuracy. For example, if the air conditioning load decreases, the flow rate of the heat exchange medium is decreased by the two flow rate adjusting valves 16 and 17 according to the amount of decrease in the air conditioning load. If the air conditioning load further decreases, the heat exchange medium of the return air side heat exchanger 11 is bypassed by the second flow rate adjustment valve 17, and the heat exchange medium is supplied only to the outside air side heat exchanger 10 by the first flow rate adjustment valve 16. Circulate.

  The air conditioning capacity compensator 30 compares the enthalpy required for the first process of the outdoor air side heat exchanger 10 with the enthalpy required for the second process of the return air side heat exchanger 11, and the air volume of the air for air conditioning having a large enthalpy And the outside air damper 21 and the return air damper 22 are operated so that the air volume of the air-conditioning air with a small enthalpy increases. Here, the enthalpy required for the first process is an enthalpy required for cooling or heating the air-conditioning air before the first process to a preset temperature, and the enthalpy required for the second process is the second process. This is the enthalpy required to cool or heat the previous air-conditioning air to a preset temperature.

  For example, when the enthalpy required for the first process is smaller than the enthalpy required for the second process, the air volume of the outside air before the first process is increased and the air volume of the return air before the second process is decreased, which is used wastefully. Reduce cooling or heating energy. The enthalpy required for the first process and the second process is calculated from the temperature and humidity detected by the outside air sensor 33 and the return air sensor 34. Since the air volume of air-conditioning air with a large enthalpy is reduced and the air volume of air-conditioning air with a low enthalpy is increased, an extra air-conditioning load is reduced and energy saving can be achieved.

  The first evaporative cooling unit 31 operates one or both of the outside air-side vaporizer humidifier 12 and the return air-side vaporizer humidifier 13 without causing the air-conditioning air to transfer heat of the heat exchange medium. It has a function to evaporate and cool air. Further, the first evaporative cooling unit 31 is an outside air side vaporization type so that the air state of the mixed air of the outside air in the outside air passage 8 and the return air in the return air passage 9 becomes an air state suitable for air conditioning of the air-conditioned space S. One or both of the humidifier 12 and the return air side vaporizing humidifier 13 are operated to evaporate and cool the air-conditioning air, and the air volume adjusting device 19 is operated to return the outside air volume of the outside air path 8 and the return air of the return air path 9. It has a function to adjust the air volume.

  For example, when the humidity detected by the outside air sensor 33 and the return air sensor 34 is compared with the set humidity of the air-conditioned space S and the outside air humidity of the outside air path 8 is lower than the set humidity of the air-conditioned space S, The flow of the heat exchange medium in the outside air heat exchanger 10 is stopped, and the outside air vaporizing humidifier 12 is operated to perform a process for evaporating and cooling the outside air in a range where the outside air humidity does not exceed the set humidity. Further, when the return air temperature of the return air passage 9 is lower than the set humidity of the air-conditioned space S, the flow of the heat exchange medium of the return air side heat exchanger 11 is stopped, and the return air side humidifier 13 is turned on. The return air is vaporized and cooled as long as the return air humidity does not exceed the set humidity.

  With the above processing, on the air diagram (not shown), the outside air temperature and the outside air are placed on the sensible heat ratio line passing through the point of the air condition (target temperature and target humidity) suitable for air conditioning of the air-conditioned space S. Reach the humidity point and the return air temperature and return air humidity points. The temperature and humidity of the air (air supply to the air-conditioned space S) mixed with the outside air and the return air are detected by the air supply sensor 35 and compared with the set temperature and humidity, and suitable for air conditioning of the air-conditioned space S. The air volume adjustment device 19 is operated to increase or decrease the outside air volume and the return air volume so that the air condition (target temperature and target humidity for supplying air to the air-conditioned space S) is reached, and the temperature and humidity points of the mixed air are adjusted. Move along the line of sensible heat ratio to reach the target temperature and target humidity points of the supply air.

  The outside air cooling control unit 32 compares the set temperature of the air-conditioned space S with the outside air temperature of the outside air path 8 without causing the air for air to exchange heat of the heat exchange medium, and the outside air temperature does not exceed the set temperature. Then, the outside air is supplied to the air-conditioned space S to cool the air-conditioned space S.

  In the case of cooling operation in which the heat exchange medium is cold water and needs to be dehumidified in the summer, the outside air is cooled and dehumidified with the outside air heat exchanger 10 and mixed with the return air cooled without being dehumidified with the return air side heat exchanger 11. Then, control is performed so that the target temperature and target humidity of the supply air are obtained. At the time of a cooling operation that does not require dehumidification of the outside air, the cooling operation can be performed by using both the evaporative cooling by the outdoor air side humidifier 12 and the return air side humidifier 13 to save energy.

  When the heat exchange medium is heated with warm water in the winter, the outside air is heated by the outside air side heat exchanger 10, the return air is heated by the return air side heat exchanger 11, and the outside air side vaporizing humidifier 12 depending on the situation. Then, the air is humidified by the return-side vaporizing humidifier 13 and mixed so that the target temperature and the target humidity are controlled. When the heat exchange medium is warm water and performs a cooling operation in winter, the outside air heat exchanger 10 does not heat the outside air at a temperature lower than the temperature of the air-conditioned space S without being heated by the outside air heat exchanger 10 or to a temperature suitable for cooling. The return air is supplied to the air-conditioned space S as it is without being heated by the return air heat exchanger 11, and is cooled by the outside air. At this time, depending on the situation, humidification is performed by the outside-air side vaporizing humidifier 12 and the return-air side vaporizing humidifier 13, but the humidification amount can be increased even by the vaporization type by humidifying the return air having a high temperature.

  FIG. 4 is the same as the embodiment shown in FIG. 2 except that the outside-side vaporizing humidifier 12 is omitted, and a steam humidifier 40 that humidifies at least the outside air with steam among the air-conditioning air in the outside air path 8 and the return air path 9 is provided. It is a thing. Further, in place of the first evaporative cooling unit 31, the air conditioner control device 2 operates the steam humidifier 40 to heat the air-conditioning air without transferring heat of the heat exchange medium to the air-conditioning air. 41 and a second evaporative cooling unit 42 that evaporates and cools the return air by operating the return-side vaporization humidifier 13 without transferring heat of the heat exchange medium to the air-conditioning air. In the illustrated example, the steam humidifier 40 is provided only on the lee of the outdoor air side heat exchanger 10, but may be provided on the lee of the return air side heat exchanger 11.

  The second evaporative cooling unit 42 is configured to return-side vaporization humidification so that the air state of the mixed air of the outside air in the outside air passage 8 and the return air in the return air passage 9 becomes an air state suitable for air conditioning of the air-conditioned space S. The apparatus 13 is operated to evaporate and cool the return air, and the air volume adjusting device 19 is operated to adjust the outside air volume in the outside air path 8 and the return air volume in the return air path 9.

  For example, when the return air humidity detected by the return air sensor 34 is compared with the set humidity of the air-conditioned space S and the return air temperature of the return air path 9 is lower than the set humidity of the air-conditioned space S, The flow of the heat exchange medium in the return air side heat exchanger 11 is stopped, and the return air side humidification humidifier 13 is operated to perform a process for evaporating and cooling the return air in a range where the return air humidity does not exceed the set humidity.

  With the above processing, on the air diagram (not shown), the outside air temperature and the outside air are placed on the sensible heat ratio line passing through the point of the air condition (target temperature and target humidity) suitable for air conditioning of the air-conditioned space S. Reach the humidity point and the return air temperature and return air humidity points. The temperature and humidity of the air (air supply to the air-conditioned space S) mixed with the outside air and the return air are detected by the air supply sensor 35 and compared with the set temperature and humidity, and suitable for air conditioning of the air-conditioned space S. The air volume adjusting device 19 is operated to increase or decrease the outside air volume and the return air volume so that the air condition (target temperature and target humidity of the air supply to the air-conditioned space S) is reached. Move along the line of sensible heat ratio to reach the target temperature and target humidity points of the supply air.

  Further, the humidifying / heating unit 41 compares, for example, the outside air humidity detected by the outside air sensor 33 and the set humidity of the air-conditioned space S so that the outside air humidity of the outside air path 8 is higher than the set humidity of the air-conditioned space S. When it is low, the circulation of the heat exchange medium in the outside air side heat exchanger 10 is stopped, and the steam humidifier 40 is operated to perform a process of heating the outside air in a range where the outside air humidity does not exceed the set humidity. In addition, when the air-conditioned space S needs to be humidified, the air-conditioning air is first humidified by the return air side vaporizer humidifier 13 with low energy consumption, and the return air side vaporizer humidifier 13 becomes insufficiently humidified. In some cases, the steam humidifier 40 has a function of humidifying at least the shortage. As a result, both improvement in humidification accuracy and reduction in energy consumption can be achieved. Other configurations and operation examples are the same as those in the embodiment of FIG.

  2 and 4 exemplify the floor-mounted air conditioner 1 (1a), the ceiling-mounted air conditioner 1 (1b) as shown in FIGS. 1 and 5 may be used. 5 omits the outside air damper 21, the return air damper 22, and the blower 18 in the embodiment of FIG. 2, and provides the outside air side blower 45 in the outside air path 8 as the air volume adjusting device 19 and the return air side fan in the return air path 9. 46 is provided. The outside air blower 45 and the return air blower 46 are configured to have a function capable of adjusting the outside air volume of the outside air path 8 and the return air volume of the return air path 9 by increasing / decreasing the rotation speed. Other configurations and operation examples are the same as those in the embodiment of FIG.

  FIG. 6 shows the heat storage tank 3, the heat source device 4, the circulation device 5, the first pipe line 14, the second pipe line 15, the first flow rate adjustment valve 16 and the second flow rate adjustment valve in the embodiment of FIGS. 1 and 2. The air conditioner 1 (1c) is provided with a heat pump using the heat exchange medium as a refrigerant instead of the heat exchange medium. The outside air side heat exchanger 10 and the return air side heat exchanger 11 constitute a heat pump with the heat source side heat exchanger 50, the compressor 51, and other devices. With the operation of the compressor 51, the heat of the refrigerant is transferred to the air-conditioning air via the outside air side heat exchanger 10 and the return air side heat exchanger 11.

  The air conditioner control device 2 replaces the first air conditioning capability control unit 29, and adjusts the outside air and the return air to the air condition suitable for air conditioning by increasing / decreasing the rotation speed of the compressor 51. A control unit 52 is provided. Other configurations and operation examples are the same as those in the embodiment of FIG. In the example shown in the figure, it is configured as a separate type that is divided into an outdoor unit side and an indoor unit side. However, the outdoor unit side and the indoor unit side are provided in the casing 20, and air for heat exchange is ducted to the heat source side heat exchanger 50. You may comprise so that it may send by.

  In addition, this invention is not limited to the above-mentioned Example. Although not shown, in the embodiment of FIG. 6, instead of the outside air-side humidifier 12, a steam humidifier that humidifies at least the outside air with steam among the air-conditioning air in the outside air path 8 and the return air path 9, In addition, the air conditioner control device 2 operates the humidification heating unit that operates the steam humidifier to heat the air for air conditioning and the return air side vaporization humidifier 13 instead of the first evaporative cooling unit 31. A second evaporative cooling unit for evaporating and cooling the air-conditioning air.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Air conditioner control apparatus 3 Heat storage tank 4 Heat source machine 5 Circulating equipment 8 Outside air path 9 Return air path 12 Outside air side vaporization type humidifier 13 Return air side vaporization type humidifier 19 Air volume adjustment apparatus 31 1st evaporative cooling part 40 Steam humidifier 41 Humidification heating part 42 Second evaporative cooling part S Air-conditioned space

Claims (3)

An air conditioner (1) that mixes outside air and return air to supply air to the air- conditioned space (S), and an air conditioner control device (2) that controls the operation of the air conditioner (1).
The air conditioner (1) is, the outside air path through the previous Kigaiki (8), the return air path before Symbol return air passes and (9), the heat of the heat exchange medium to the outside air of the outside air passage (8) An outside air side heat exchanger (10) to be exchanged, a return air side heat exchanger (11) to exchange heat of the heat exchange medium to the return air of the return air path (9), and the outside air path (8) An outside air-side vaporizing humidifier (12) that humidifies the outside air by vaporization and evaporation of water, and a return air-side vaporizing humidifier (13) that humidifies the return air in the return air passage (9) by vaporization and evaporation of water. ), And an air volume adjusting device (19) for adjusting the outside air volume of the outside air path (8) and the return air volume of the return air path (9),
The air conditioner control device (2) causes the outside air-side vaporizing humidifier (12) and the return air-side vaporizing humidifier (13) to transfer the heat of the heat exchange medium to the outside air and the return air. One or both of them, and the outside air temperature / outside humidity point and the return air temperature / return air humidity point reach the sensible heat ratio line passing through the target temperature / target humidity point of the supply air and the air volume In the adjustment device (19), the outside air flow rate and the return air flow rate are increased / decreased, and the temperature and humidity points of the supply air are moved along the line of the sensible heat ratio, and the target temperature of the supply air and the An air conditioner comprising a first evaporative cooling unit (31) for reaching the point of the target humidity . The air conditioner according to claim 1, further comprising a steam humidifier (40) for humidifying the outside air with steam instead of the outside air-side humidifier (12),
The air conditioner control device (2) operates the steam humidifier (40) to heat the outside air without transferring heat of the heat exchange medium to the outside air, and the return air A second evaporative cooling unit (42) configured to evaporate and cool the return air by operating the return-side vaporization humidifier (13) without transferring heat of the heat exchange medium to the atmosphere. The air conditioning apparatus according to 1. A heat storage tank (3) for storing water, an aqueous solution, or other heat exchange medium, adjusts the temperature of the heat exchange medium, uses the heat exchange medium for a temperature range suitable for cooling operation of the air conditioner, and heating operation of the air conditioner. A heat source device (4) that switches to a suitable temperature range, and a circulation device (5) that circulates the heat exchange medium between the heat source device (4) and the air conditioner (1). The air conditioning apparatus according to 1 or 2 .

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