JP4911900B2 - Air conditioner - Google Patents

Description

  The present invention relates to a total heat exchanger and an air conditioner, and sprays water or a chemical aqueous solution to exhaust containing harmful substances in research, experimental facilities, factory production lines, etc., and collects heat at the same time as purifying the exhaust. In addition, the present invention relates to a technique for preventing contamination to the air supply.

  An example of this type of total exchanger is disclosed in Patent Document 1. In this, two cold / hot water coils (heat exchangers) are provided in the outside air introduction passage, and two air washers are provided in the exhaust passage. The two air washers are sprayed by the air washer. There is a water reservoir for storing fresh water.

  The first-stage cold / hot water coil communicates with the second-stage air washer through the first pipe, and the second-stage air washer water reservoir communicates with the first-stage cold / hot water coil through the second pipe. The second-stage cold / hot water coil (heat exchanger) communicates with the first-stage air washer through the first pipe, and the water reservoir of the first-stage air washer enters the second-stage through the second pipe. It communicates with the cold / hot water coil.

  With this configuration, chilled water is sent from the first-stage chilled / hot water coil to the second-stage air washer, and chilled water is returned from the water reservoir to the first-stage chilled / hot water coil. Cold water is sent to the washer, and the cold water is returned from the water reservoir to the second-stage cold / hot water coil.

  The outside air introduced into the outside air introduction path is cooled, dehumidified or dehumidified by the first-stage cold / hot water coil, and further cooled, dehumidified or dehumidified by the second-stage cold / hot water coil (heat exchanger). Then, after the exhaust air is cooled by the first air washer in the exhaust passage, it is heated by the second air washer and released to the atmosphere.

Patent Document 2 discloses a heat recovery type chemical washer device. This is a fin-type air supply side heat exchanger that heats and cools the outside air without contact with the outside air. Supplying pure water from the nozzle to the fin part removes chemical components contained in the outside air by gas-liquid contact. In an exhaust-side heat exchanger that recovers waste heat from the exhaust without contact with the exhaust, when the enthalpy of the exhaust is lower than the outside air, the waste heat is recovered by spraying liquid from the nozzle to the exhaust. The waste heat is supplied to the air supply side heat exchanger through a closed loop heat transport circuit.
JP 2002-71183 A JP2002-219325

  In the configuration disclosed in Patent Document 1, exhaust side heat recovery in the exhaust passage is performed only by the air washer, but the water sprayed on the air washer is close to the wet bulb temperature, and the exhaust is on the high enthalpy side In addition, the temperature difference between the supply and exhaust cannot be made large, and the heat exchange rate becomes low. In addition, heat exchange in the outside air introduction path is sensible heat exchange by a cold / hot water coil, but in the intermediate period (at the time of heating load), the heat exchange ability is higher when water is sprayed on the outside air. Furthermore, it is necessary to provide the first and second pipes laid between the outside air introduction passage and the exhaust passage between the cold / hot water coils and the air washers at each stage, resulting in poor piping and workability. .

  In the configuration disclosed in Patent Document 2, pure water is constantly sprayed to the fin portion in the supply side heat exchanger, and heat exchange is always performed with the wet bulb temperature of the outside air, so that the outside air is on the high enthalpy side. In this case, the temperature difference between the outside air and the return air cannot be made large, and the heat exchange rate becomes low. The pure water supplied to the fin portion in the supply air side heat exchanger circulates on the supply air side, and the sprayed pure water itself does not exchange heat, so the water temperature of the pure water is the heat of the supply air side heat exchanger. As the temperature of the medium is approached, the heat exchange efficiency decreases. If liquid is sprayed from the nozzle to clean the exhaust, it will exchange heat with the wet bulb temperature of the exhaust, so if the exhaust is on the high enthalpy side, the temperature difference between the outside air and the exhaust cannot be made large, Exchange efficiency is low.

  The present invention solves the above-described problems, and performs a sensible heat exchange when the target gas has a high enthalpy, and a total heat exchanger that can perform a total heat exchange when the target gas has a low enthalpy, and always An object of the present invention is to provide an air conditioner capable of removing harmful substances from exhaust and removing and cleaning harmful substances from outside air while performing heat exchange.

The air conditioner of the present invention includes a front chamber for introducing a target gas from a gas inlet, a rear chamber for discharging the target gas flowing in from the front chamber from a gas outlet, a front chamber heat exchanger disposed in the front chamber, Supply heat medium to the rear chamber heat exchanger located in the room, the front chamber reservoir and rear chamber reservoir located in the lower part of each of the front chamber and rear chamber, and the front chamber heat exchanger and rear chamber heat exchanger The heat medium supply means that constitutes a processing unit, and the front chamber heat exchanger includes a heat exchange section in which the heat medium flows countercurrently to the flow of the target gas, and a front chamber that sprays the heat medium on the heat exchange section An internal feed pipe of a heat medium supply means having a nozzle and a base end communicating with the rear chamber storage tank is connected to the heat medium inlet of the heat exchange unit, and the front chamber nozzle and the heat medium outlet of the heat exchange unit are connected to each other. Connect with the connecting pipe, connect the internal return pipe of the heat medium supply means via the pipe switching means in the middle of the connecting pipe, Constituted by connecting the front chamber reservoir tip of Rikanro,
The rear chamber heat exchanger has a gas-liquid contact medium and a rear chamber nozzle that sprays the heat medium on the gas-liquid contact medium, and connects the external return pipe of the heat medium supply means to the rear chamber nozzle. Is formed by connecting an external feed line communicating with the anterior chamber storage tank and an external return line via an external heat exchange section.

  In addition, a pair of processing units is provided, one processing unit is an outside air processing unit that introduces outside air as a target gas into the system, and the other processing unit is a heat recovery unit that discharges exhaust as a target gas outside the system. In the external heat exchange unit, heat exchange is performed between the outside air processing unit and the heat recovery unit.

  The outside air processing unit is connected to the bypass conduit of the heat medium supply means via the conduit switching means provided in the middle of the external feed conduit of the heat medium supply means connected to the rear chamber nozzle, and the tip of the bypass conduit Is connected to the rear chamber storage tank.

The air conditioner of the present invention has an outside air processing unit that introduces outside air as a target gas into the system, and a heat recovery unit that discharges exhaust gas outside the system as a target gas. A front chamber into which the target gas flowing in from the front chamber is discharged from the gas outlet, a front chamber heat exchanger disposed in the front chamber, a rear chamber heat exchanger disposed in the rear chamber, and the front chamber Front chamber storage tank and rear chamber storage tank disposed in the lower part of each of the rear chamber, and a front chamber heat exchanger and a heat medium supply means for supplying a heat medium to the rear chamber heat exchanger. The apparatus has an exhaust heat exchange part in which the heat medium flows countercurrently to the flow of the target gas, and a front chamber nozzle that sprays the heat medium on the exhaust heat exchange part, and a proximal end communicates with the rear chamber storage tank. Connect the internal feed line of the heat medium supply means to the heat medium inlet of the exhaust heat exchanger, Connect the heat medium outlet of the exchange part with a communication line, connect the internal return line of the heat medium supply means via the line switching means in the middle of the connection line, and connect the tip of the internal return line to the front chamber The rear chamber heat exchanger connected to the storage tank has a gas-liquid contact medium and a rear chamber nozzle for spraying the heat medium onto the gas-liquid contact medium, and the rear chamber nozzle returns to the outside of the heat medium supply means. An external feed pipe and an external return pipe of the heat medium supply means connected to each other and having a proximal end communicating with the front chamber storage tank are connected via an outside air processing unit. Has a processing chamber that discharges the target gas introduced from the gas outlet from the gas outlet, and the outside air heat exchanging section is arranged in multiple stages along the flow direction of the target gas in the processing chamber, and each outside air heat exchanging section is connected by a connecting pipeline. heat recovery unit to the heating medium inlet of the outside air heat exchanger of the most downstream in the direction of the flow of the target gas Connect the external feed line is obtained by connecting the external return line of the heat recovery unit to the heating medium outlet of the outdoor air heat exchanger.

The air conditioner of the present invention has an outside air processing unit that introduces outside air into the system as a target gas, and a heat recovery unit that discharges exhaust gas outside the system as a target gas. A heat medium is provided to the outside air processing unit and the heat recovery unit. A heat medium supplying means for supplying heat, an external heat exchange unit for exchanging heat between the outside air processing unit and the heat recovery unit, and the heat recovery unit from the front chamber for introducing the target gas from the gas inlet, Arranged in the lower part of the front chamber and the rear chamber, the rear chamber for discharging the target gas flowing in from the gas outlet, the front chamber heat exchanger disposed in the front chamber, the rear chamber heat exchanger disposed in the rear chamber, The front chamber heat exchanger includes a front chamber storage tank and a rear chamber storage tank, and the front chamber heat exchanger has a heat medium flowing countercurrently to the target gas flow and before the heat medium is sprayed on the exhaust heat exchange section. A heating medium having a chamber nozzle and a proximal end communicating with the rear chamber storage tank The internal feed line of the supply means is connected to the heat medium inlet of the exhaust heat exchanger, the front chamber nozzle and the heat medium outlet of the exhaust heat exchanger are connected by a connecting line, and the pipe is switched in the middle of the connecting line. The internal return pipe of the heat medium supply means is connected via the means, and the tip of the internal return pipe is connected to the front chamber storage tank. The rear chamber heat exchanger is connected to the gas-liquid contact medium and the gas-liquid contact. A rear chamber nozzle for spraying a heat medium on the medium, and an external return pipe for the heat recovery unit of the heat medium supply means is connected to the rear chamber nozzle, and the external return pipe and the base end are the front chamber storage tank An external feed line for the heat recovery unit of the heat medium supply means communicating with the external heat exchange section is connected via the external heat exchange unit, and the outside air processing unit has a processing chamber for discharging the target gas introduced from the gas inlet from the gas outlet. It has, arranged in multiple stages along the flow direction of the target gas with the outside air heat exchanger into the processing chamber Connects the respective outdoor air heat exchanger in communication pipe line, connect the external return line for outdoor air processing unit of the heating medium supply means to the heat medium inlet of the most downstream of the outside air heat exchanger in the flow direction of the target gas, The external return line and the external feed line for the external air processing unit of the heat medium supply means connected to the heat medium outlet of the most upstream external air heat exchanger in the flow direction of the target gas are connected via the external heat exchanger. It is what.

In addition, a humidifier is arranged in each outside air heat exchange section of the outside air processing unit.

  In addition, the heat recovery unit has a preliminary nozzle for spraying a heat medium onto the target gas before flowing into the front chamber heat exchanger, and connects the internal circulation pipe branched from the external feed pipe to the preliminary nozzle. It will be.

In the operation method of the air conditioner of the present invention, the rear chamber heat exchanger always sprays the heat medium from the rear chamber nozzle onto the gas-liquid contact medium, and the front chamber heat exchanger communicates with the communication tube according to the enthalpy of the target gas. Wet pipe switching means in the middle of the path, the heat medium that has passed through the heat exchanging section sprayed from the front chamber nozzle to the heat exchanging section and then the wet total heat exchanging operation to the front chamber storage tank, and heat exchange The operation is performed by switching between the dry sensible heat exchange operation in which the heat medium passing through the section reaches the front chamber storage tank through the internal return pipe.

  As described above, according to the present invention, the heat medium passing through the heat exchanging unit is sprayed from the front chamber nozzle to the heat exchanging unit by operating the pipe switching unit in the middle of the connecting pipe according to the enthalpy of the target gas. Operation is switched between a wet total heat exchange operation that reaches the front chamber storage tank and a dry sensible heat exchange operation in which the heat medium that has passed through the heat exchange section passes through the internal return pipe to the front chamber storage tank. It is possible to operate within a large temperature difference between the outside air and the exhaust, and the heat recovered by total heat exchange can be used effectively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the air conditioner includes an outside air processing unit 1 and a heat recovery unit 2. The outside air processing unit 1 introduces outside air 3 and supplies it as air supply 4 after processing into the air conditioning target system. The heat recovery unit 2 introduces exhaust (return air) 5 discharged from the air-conditioning target system and discharges it to the atmosphere 6 outside the air-conditioning target system after processing. The outside air processing unit 1 and the heat recovery unit 2 are external heat sources. Heat exchange is performed in the exchange unit 7.

  The heat recovery unit 2 includes a front chamber 9 provided with a gas inlet 8 for introducing exhaust 5 and a rear chamber 11 provided with a gas outlet 10 for discharging processed air to the atmosphere 5. An air vent 13 is provided in the upper part of the partition wall 12 separating the rear chamber 11, and air flows from the front chamber 9 into the rear chamber 11 through the air vent 13.

  A front chamber heat exchanger 14 is disposed in the front chamber 9, a rear chamber heat exchanger 15 is disposed in the rear chamber 11, and a front chamber storage tank 16 and a rear chamber are disposed in the lower portions of the front chamber 9 and the rear chamber 11, respectively. A storage tank 17 is provided, and a water passage hole 18 for adjusting the water level of the front chamber storage tank 16 and the rear chamber storage tank 17 to the same level is provided in the partition wall 12. The front chamber heat exchanger 14 and the rear chamber heat exchanger 15 are connected to a heat medium supply pipe line system 19 serving as a heat medium supply means for supplying a heat medium (water).

  The front chamber heat exchanger 14 includes a heat exchange section 20 through which a heat medium flows, and a front chamber nozzle 21 that forms a spray section that sprays the heat medium onto the heat exchange section 20. The heat exchanging unit 20 is composed of a coil in which a plurality of tubes are inserted into a plurality of fins arranged in parallel, and the fin surface is installed along the vertical direction, and has a heat medium inlet 22a and a heat medium outlet 22b. Yes. The heat medium flowing into the heat exchanging unit 20 from the heat medium inlet 22a flows in the opposite direction opposite to the air flow and reaches the heat medium outlet 22b. The front chamber nozzle 21 sprays the heat medium in the opposite direction opposite to the air flow.

  The rear chamber heat exchanger 15 includes a gas-liquid contact medium 23 and a rear chamber nozzle 24 that forms a spray unit that sprays the heat medium on the gas-liquid contact medium 23. The gas-liquid contact medium 23 has a plurality of fins arranged in parallel as a medium for carrying a heat medium, and carries the heat medium on the surface of the fin to make contact with air. The medium of the gas-liquid contact medium 23 can also be formed of a metal wire such as stainless steel.

A preliminary nozzle 25 is disposed below the front chamber heat exchanger 14, and the preliminary nozzle 25 sprays a heat medium on the air before flowing into the front chamber heat exchanger 14.
In the heat medium supply line system 19, an internal feed line 26 having a pump 26 a connects the rear chamber storage tank 17 and the heat medium inlet 22 a of the heat exchange unit 20, and a communication line 27 connects the front chamber nozzle 21 and the heat medium. An internal return line 29 is connected to the heat medium outlet 22b of the exchange unit 20 via a three-way valve 28 serving as a line switching means in the middle of the connecting line 27, and the front end of the internal return line 29 is connected to the front. It communicates with the chamber storage tank 16. Further, the external return line 30 is connected to the rear chamber nozzle 24, the external feed line 31 having a pump 31a is connected to the front chamber storage tank 16, and the external return line 30 and the external feed line 31 are external heat exchanges. An internal circulation line 33 communicating with the part 7 and branching from the external feed line 31 and serving as an on-off valve 32 is connected to the preliminary nozzle 25. In addition, an overflow pipe 34 opens at a predetermined position in the front chamber 9, and a makeup water pipe 35 is connected to the rear chamber 11.

  The outside air processing unit 1 includes the same components as the heat recovery unit 2 in the basic configuration, and description of each component is omitted and 100 is added to the reference numeral. The difference between the outside air processing unit 1 and the heat recovery unit 2 is as follows.

  In the heat recovery unit 2, the gas inlet 8 and the gas outlet 10 are located at the lower part of the unit, the vent hole 13 is located at the upper side of the partition wall 12, and in the outside air processing unit 1, the gas inlet 108 and the gas outlet 110 are located at the upper part of the unit. The vent 113 is located on the lower side of the partition wall 112. Further, the preliminary nozzle 25, the on-off valve 32, and the internal circulation line 33 are not provided, and a bypass line 130b is provided in the middle of the external return line 130 via a three-way valve 130a. The three-way valve 130a and the bypass conduit 130b provided in the middle of the external return conduit 130 are provided as necessary, and may not have these configurations.

  An exhaust fan device 36 is connected to the gas outlet 10 of the heat recovery unit 2, and an air supply fan device 136 is connected to the gas outlet 110 of the outside air processing unit 1. In addition, the external return pipe 130 and the external feed pipe 131 of the outside air processing unit 1 communicate with each other via the outside heat exchanging unit 7, and the heat medium flowing through the outside air processing unit 1 and the heat recovery unit 2 are connected to the outside heat exchanging unit 7. Heat exchange is performed with the flowing heat medium.

  Hereinafter, the operation of the above-described configuration will be described. In the outside air processing unit 1, outside air 3 flowing into the front chamber 109 from the gas inlet 108 passes from the top to the bottom through the front chamber heat exchanger 114, and flows into the rear chamber 111 through the vent 113 at the bottom of the partition wall 112. Then, the air passes through the rear chamber heat exchanger 115 from the lower side to the upper side, flows into the air supply fan device 136 from the gas outlet 110, and is supplied from the air supply fan device 136 to the air conditioning target system as the air supply 4.

  In the heat recovery unit 2, the exhaust 5 flowing into the front chamber 9 from the air-conditioning target system through the gas inlet 8 passes through the front chamber heat exchanger 14 from below to above and passes through the vent 13 at the top of the partition wall 12. The air flows into the chamber 11, passes through the rear chamber heat exchanger 15 from the upper side to the lower side, flows into the exhaust fan device 36 from the gas outlet 10, and is discharged from the exhaust fan device 36 to the atmosphere 6.

  Next, the flow of the heat medium will be described. FIG. 1 shows an operation state in the summer mode. In the front chamber heat exchanger 114 of the outside air processing unit 1, the three-way valve 128 of the communication pipe 127 is connected to the heat medium outlet 122 b of the heat exchanger 120 and the internal return pipe 129. As a dry-type sensible heat exchanger in which the heat medium passing through the heat exchange section 120 passes through the internal return pipe 129 and reaches the front chamber storage tank 116. drive. The rear chamber heat exchanger 115 communicates the three-way valve 130a of the external return line 130 with the rear chamber nozzle 124 and shuts off the bypass line 130b, and operates as a total heat exchanger.

  Further, in the front chamber heat exchanger 14 of the heat recovery unit 2, the three-way valve 28 of the communication line 27 communicates the heat medium outlet 22 b of the heat exchange unit 20 and the front chamber nozzle 21, and the internal return pipe 29 is connected. The heat medium that has passed through the heat exchanger 20 is sprayed from the front chamber nozzle 21 to the heat exchanger 20 and then operates as a wet total heat exchanger that reaches the front chamber reservoir 16. The rear chamber heat exchanger 15 is a total heat exchanger.

  As described above, the front chamber heat exchangers 14 and 114 operate the three-way valves 28 and 128 in the middle of the connecting pipe lines 27 and 127 according to the enthalpy of the target gas, and perform the wet total heat exchange operation and the dry sensible heat. Switch to exchange operation. That is, since the enthalpy of the outside air 3 is higher in the outside air processing unit 1 than the supplied heat medium, the sensible heat exchange is performed in the front chamber heat exchanger 114 and the total heat exchange is performed in the rear chamber heat exchanger 115. In the recovery unit 2, the enthalpy of the exhaust 5 is lower than that of the heat medium to be supplied.

  In the outside air processing unit 1, the heat medium supplied from the internal feed line 126 to the front chamber heat exchanger 114 is sensible heat exchanged through fins in the heat exchanging unit 120 to cool the outside air 3, and the internal return line 129. Flows through the front chamber storage tank 116.

  The heat medium in the front chamber storage tank 116 passes through the external feed pipe 131 and is cooled by the external heat exchange unit 7, and then supplied from the external return pipe 130 to the rear chamber nozzle 124 and sprayed onto the gas-liquid contact medium 123. The heat medium carried on the surfaces of the fins of the gas-liquid contact medium 123 performs total heat exchange with the outside air 3 cooled by the front chamber heat exchanger 114 in a wet manner. Further, the heat medium sprayed from the rear chamber nozzle 124 to the gas-liquid contact medium 123 purifies the outside air 3. The heat medium flowing down from the gas-liquid contact medium 123 to the rear chamber storage tank 117 is supplied to the front chamber heat exchanger 114 from the internal feed line 126. Further, fresh water is supplied to the rear chamber storage tank 117 from the supply water pipe 135. The air cooled and purified by the gas-liquid contact medium 123 is supplied to the air conditioning target system by the air supply fan device 136.

  As described above, in the outside air processing unit 1, the outside air 3 and the heat medium counter-flow, that is, the outside air 3 flows from the front chamber side to the rear chamber side, and the heat medium flows from the rear chamber side to the front chamber side, thereby increasing the cooling efficiency. For example, outside air 3 with DB (dry bulb temperature) 32 ° C./WB (wet bulb temperature) 27 ° C. becomes supply air 4 with DB (dry bulb temperature) 22.1 ° C./WB (wet bulb temperature) 22.1 ° C. The 20.3 ° C. heat medium coming out of the external heat exchanging unit 7 returns at 26.5 ° C. In addition, by performing heat exchange between the heat medium flowing through the outside air processing unit 1 and the heat medium flowing through the heat recovery unit 2 in the external heat exchange unit 7, total heat exchange is performed between the outside air processing unit 1 and the heat recovery unit 2. However, no contamination occurs.

  In the heat recovery unit 2, the heat medium supplied from the internal feed pipe 26 to the front chamber heat exchanger 14 reaches the front chamber nozzle 21 from the communication pipe 27 through the heat exchanger 20, and sprays on the heat exchanger 20. Then, the entire heat is exchanged wet on the fin surface to take the cold from the exhaust 5 and flow down to the front chamber storage tank 16.

  Further, the opening / closing valve 32 is opened, the heat medium flowing to the front chamber storage tank 16 is supplied from the internal circulation pipe 33 to the preliminary nozzle 25, and the exhaust 5 before flowing into the heat exchanging unit 20 is A heat medium is sprayed from the nozzle 25.

  The heat medium in the front chamber storage tank 16 is heated by the external heat exchange unit 7 through the external feed pipe 31 and then supplied from the external return pipe 30 to the rear chamber nozzle 24 to be sprayed on the gas-liquid contact medium 23. . The heat medium carried on the surfaces of the fins of the gas-liquid contact medium 23 is wet-heated and totally exchanged with the exhaust 5 heated by the front chamber heat exchanger 14.

  The heat medium flowing down from the gas-liquid contact medium 23 to the rear chamber storage tank 17 is supplied to the front chamber heat exchanger 14 from the internal feed line 26. In addition, fresh water is supplied to the rear chamber storage tank 17 from the supply water pipe 35. The air heated by the gas-liquid contact medium 23 is discharged outside the air-conditioning target system by the exhaust fan device 36.

  As described above, in the heat recovery unit 2, the exhaust 5 and the heat medium are counter-flowed, that is, the heat exchange efficiency is improved by the exhaust 5 flowing from the front chamber side to the rear chamber side and the heat medium flowing from the rear chamber side to the front chamber side. For example, the exhaust 5 with DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) 16 ° C. becomes air with DB (dry bulb temperature) 23.2 ° C./WB (wet bulb temperature) 23.2 ° C. Then, the 25.5 ° C. heat medium discharged from the external heat exchange unit 7 is returned to the atmosphere 6 and returned at 19.3 ° C.

  The air state transition in this summer mode is shown in the air diagram of FIG. The outside air 3 becomes the supply air 4 and flows into the air conditioning target system, and the exhaust (return air) 5 discharged from the air conditioning target system becomes the atmosphere 6. In this air diagram, a line a shows an ideal change (equal enthalpy change) of the outside air 3 in a state where the heat medium is sprayed in the outside air processing unit 1, and a line b shows a state where the heat medium is sprayed in the heat recovery unit 2. The ideal change (isoenthalpy change) of the exhaust 5 is shown.

Enthalpy change .DELTA.i A between the outside air 3 and the exhaust _5, enthalpy change .DELTA.i S between the outside air 3 and the air supply 4 _is enthalpy change .DELTA.i _e between the exhaust 5 and the atmosphere 6, efficiency [ Δi _S (≈Δi _e ) / Δi _A ], which can be operated within a large temperature difference range between the dry bulb temperature (OA, DB) of the outside air 3 and the wet bulb temperature (RA, WB) of the exhaust 5, The heat recovered by heat exchange can be used effectively.

  Here, a comparison with the air state transition in the conventional configuration will be described. FIG. 6A shows a configuration in which a loop circuit 53 in which a heat medium circulates between a heat exchanger 51 that performs an outside air process and a heat exchanger 52 that performs an exhaust process, and an air diagram thereof. The outside air 3 becomes the supply air 4 by the sensible heat exchange of the heat exchanger 51, and the exhaust (return air) 5 becomes the atmosphere 6 by the sensible heat exchange of the heat exchanger 52. In this case, the operation is performed at a temperature difference between the dry bulb temperature (OA, DB) of the outside air 3 and the dry bulb temperature (RA, DB) of the exhaust 5.

FIG. 6B shows a loop circuit 53 in which a heat medium circulates between a heat exchanger 51 that performs an outside air process and a heat exchanger 52 that performs an exhaust process, toward the heat exchanger 52 that performs an exhaust process. The structure which sprays separate water from the nozzle 54, and its air diagram are shown, the outside air 3 becomes the supply air 4 by sensible heat exchange of the heat exchanger 51, and the exhaust (return air) 5 exchanges heat with the water spray. The sensible heat exchange of the vessel 52 results in the atmosphere 6 (6 ′ is an ideal point). In this case, the operation is performed at a temperature difference between the dry bulb temperature (OA, DB) of the outside air 3 and the wet bulb temperature (RA, WB) of the exhaust 5, but the amount of heat recovered from the water sprayed from the nozzle 54 is effective. Since it is not used and only sensible heat exchange is performed, heat exchange exceeding Δi _e ′ corresponding to the ideal point 6 ′ cannot be performed even if heat exchange is ideally 100%.

  FIG. 2 shows an operation state in the intermediate period mode (at the time of cooling load). In the front chamber heat exchanger 114 of the outside air processing unit 1, the three-way valve 128 of the communication pipe 127 is the heat medium outlet 122 b of the heat exchanger 120. And the front chamber nozzle 121 are in a state of being in communication with the internal return pipe 129, and the heat medium that has passed through the heat exchange unit 120 passes through the internal return pipe 129 and reaches the front chamber storage tank 116. It operates as a sensible heat exchanger. The rear chamber heat exchanger 115 is in a state where the three-way valve 130a of the external return line 130 is shut off from the rear chamber nozzle 124 and communicates with the bypass line 130b, and the operation as the heat exchanger is stopped. .

  Further, the front chamber heat exchanger 14 of the heat recovery processing unit 2 operates in the same manner as in the summer mode. That is, since the enthalpy of the outside air 3 is higher in the outside air processing unit 1 than the heat medium supplied, only the front chamber heat exchanger 114 is subjected to sensible heat exchange, and an operation for preventing an increase in humidity due to spraying of the heat medium is performed. In the recovery unit 2, the enthalpy of the exhaust 5 is lower than that of the heat medium to be supplied. That is, as shown in the air diagram of FIG. 5B, in the intermediate period mode (at the time of cooling load), the dry bulb temperature (OA, DB) of the outside air 3 and the wet bulb temperature (RA, WB) of the exhaust 5 Can operate with a large temperature difference.

  FIG. 3 shows an operation state in the intermediate period mode (at the time of heating load). In the front chamber heat exchanger 114 of the outside air processing unit 1, the three-way valve 128 of the communication pipe 127 is the heat medium outlet 122 b of the heat exchanger 120. And the front chamber nozzle 121 are in communication with each other and are blocked from the internal return pipe 129, and the heat medium that has passed through the heat exchange unit 120 is sprayed from the front chamber nozzle 121 to the heat exchange unit 120. It operates as a wet total heat exchanger leading to the storage tank 116. The rear chamber heat exchanger 115 communicates the three-way valve 130a of the external return line 130 with the rear chamber nozzle 124 and shuts off the bypass line 130b, and operates as a total heat exchanger.

  Further, in the front chamber heat exchanger 14 of the heat recovery processing unit 2, the three-way valve 28 of the communication pipe line 27 communicates the heat medium outlet 22 b of the heat exchange unit 20 and the internal return pipe line 29 to the front chamber nozzle 21. The heat medium that has passed through the heat exchanger 20 is operated as a dry sensible heat exchanger that passes through the internal return pipe 29 to the front chamber storage tank 16, and the on-off valve 32 is closed. The supply to the preliminary nozzle 25 is shut off.

  That is, since the enthalpy of the outside air 3 is lower in the outside air processing unit 1 than the heat medium to be supplied, the total heat exchange is performed by the front chamber heat exchanger 114 and the total heat exchange is performed by the rear chamber heat exchanger 115, Since the enthalpy of the exhaust 5 is higher in the recovery unit 2 than the heat medium to be supplied, an operation is performed in which sensible heat is exchanged in the front chamber heat exchanger 14 and total heat is exchanged in the rear chamber heat exchanger 15.

  In this intermediate period mode (at the time of heating load), the outside air 3 is heated by the front chamber heat exchanger 114 and the rear chamber heat exchanger 115 of the outside air processing unit 1. For example, the outside air 3 with DB (dry bulb temperature) 3 ° C./WB (wet bulb temperature) 0 ° C. becomes the supply air 4 with DB (dry bulb temperature) 9.5 ° C./WB (wet bulb temperature) 9.5 ° C., The 11.7 ° C. heat medium coming out of the external heat exchanging section 7 returns at 6.7 ° C.

  Further, the front chamber heat exchanger 14 and the rear chamber heat exchanger 15 of the heat recovery processing unit 2 take heat from the exhaust 5 to heat the heat medium. For example, the exhaust 5 with DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) 16 ° C. becomes air with DB (dry bulb temperature) 9.0 ° C./WB (wet bulb temperature) 9.0 ° C., and external heat The heat medium at 7.7 ° C. coming out of the exchange unit 7 returns at 12.7 ° C.

  In this intermediate period mode (at the time of heating load), as shown in the air diagram of FIG. 5C, the wet bulb temperature (OA, WB) of the outside air 3 and the dry bulb temperature (RA, DB) of the exhaust 5 Can operate with a large temperature difference.

  FIG. 4 shows the operation state in the winter mode (peak time). In the front chamber heat exchanger 114 of the outside air processing unit 1, the three-way valve 128 of the communication pipe 127 is connected to the front of the heat medium outlet 122b of the heat exchanger 120. The chamber nozzle 121 is shut off and communicated with the internal return pipe 129, and the heat exchanging unit 120 is operated as a dry sensible heat exchanger. The rear chamber heat exchanger 115 communicates the three-way valve 130a of the external return line 130 with the rear chamber nozzle 124 and shuts off the bypass line 130b, and operates as a total heat exchanger.

  Further, in the front chamber heat exchanger 14 of the heat recovery processing unit 2, the three-way valve 28 of the communication pipe line 27 communicates the heat medium outlet 22 b of the heat exchange unit 20 and the internal return pipe line 29 to the front chamber nozzle 21. The heat medium that has passed through the heat exchanger 20 is operated as a dry sensible heat exchanger that passes through the internal return pipe 29 to the front chamber storage tank 16, and the on-off valve 32 is closed. The supply to the preliminary nozzle 25 is shut off.

  That is, in the outside air processing unit 1, the wet bulb temperature of the outside air 3 becomes negative and may freeze. Therefore, the sensible heat exchange is performed in the front chamber heat exchanger 114 and the total heat exchange is performed in the rear chamber heat exchanger 115. In the heat recovery unit 2, the enthalpy of the exhaust 5 is higher than that of the heat medium to be supplied. Therefore, the sensible heat exchange is performed in the front chamber heat exchanger 14 and the total heat exchange is performed in the rear chamber heat exchanger 115.

  In this winter mode, the outside air 3 is heated by the front chamber heat exchanger 114 and the rear chamber heat exchanger 115 of the outside air processing unit 1. For example, the outside air 3 of DB (dry bulb temperature) -2 ° C./WB (wet bulb temperature) -5 ° C. is supplied air 4 of DB (dry bulb temperature) 7.0 ° C./WB (wet bulb temperature) 6.7 ° C. Thus, the 10.1 ° C. heat medium exiting from the external heat exchanging section 7 returns at 5.1 ° C.

  Further, the front chamber heat exchanger 14 and the rear chamber heat exchanger 15 of the heat recovery processing unit 2 take heat from the exhaust 5 to heat the heat medium. For example, the exhaust 5 with DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) 16 ° C. becomes air with DB (dry bulb temperature) 7.1 ° C./WB (wet bulb temperature) 7.1 ° C., and external heat The heat medium of 6.1 ° C. coming out of the exchange unit 7 returns at 12.1 ° C.

In this winter mode, the vehicle can be operated at a temperature difference between the dry bulb temperature (OA, DB) of the outside air 3 and the dry bulb temperature (RA, DB) of the exhaust 5 as shown in the air diagram of FIG.
FIG. 7 shows another embodiment of the present invention. The points different from the previous embodiment shown in FIG. 1 are as follows.

  In the heat recovery unit 2, the gas inlet 8 and the gas outlet 10 are located at the upper part of the unit, and the vent hole 13 is located at the lower side of the partition wall 12. Further, the preliminary nozzle 25, the on-off valve 32, and the internal circulation line 33 are not provided, and the outside air processing unit 1 does not have the three-way valve 130a and the bypass line 130b provided in the middle of the external return line 130.

  In this configuration, basically the same operation as the previous embodiment can be performed, there is no intermediate period mode (at the time of cooling load), and the summer mode is dealt with, and in the latter half of the air flow Since it sprays in the direction which opposes by the back chamber 24, heat exchange efficiency improves.

FIG. 8 shows another embodiment of the present invention, and the following points are different from the previous embodiment shown in FIG.
The outside air processing unit 201 has a processing chamber 204 that discharges the outside air 3 introduced from the gas inlet 202 from the gas outlet 203, and the outside air heat exchanging unit 205 is multi-staged along the flow direction of the outside air 3 inside the processing chamber 204. The outside air heat exchanging units 205 are connected by connecting pipes 206, and the external feed pipe 31 of the heat recovery unit 2 is connected to the most downstream outside air heat exchanging unit 205 in the flow direction of the outside air 3. The external return pipe 30 of the heat recovery unit 2 is connected to the most upstream outdoor air heat exchanger 205 in the flow direction 3.

  In addition, a vaporizing humidifier 209 is provided at a downstream position of the outdoor air heat exchanging unit 205 except for the outdoor air heat exchanging unit 205 at the most downstream position, and the vaporizing humidifier 209 is also provided at a downstream position of the gas inlet 202. Yes. A water supply pipe 211 communicates with each vaporizing humidifier 209 via an on-off valve 210.

  With the configuration described above, in the outside air processing unit 201, the outside air 3 flowing into the processing chamber 204 from the gas inlet 202 passes through each outside air heat exchanging unit 205 and flows into the supply fan device 136 from the gas outlet 203. The air supply 4 is supplied from the fan device 136 to the air-conditioning target system.

  In the heat recovery unit 2, the exhaust 5 flowing into the front chamber 9 from the air-conditioning target system through the gas inlet 8 passes through the front chamber heat exchanger 14 from below to above and passes through the vent 13 at the top of the partition wall 12. The air flows into the chamber 11, passes through the rear chamber heat exchanger 15 from the upper side to the lower side, flows into the exhaust fan device 36 from the gas outlet 10, and is discharged from the exhaust fan device 36 to the atmosphere 6.

  Next, the flow of the heat medium will be described. FIG. 8 shows the operation state in the summer mode. In this summer mode, all the on-off valves 210 are closed in the outside air processing unit 201, and humidification in each vaporizing humidifier 209 is stopped. In the heat recovery unit 2, the same operation as in the summer mode in the previous embodiment shown in FIG. 1 is performed.

  For this reason, the outside air processing unit 201 performs a cooling and dehumidifying operation. For example, the outside air 3 with DB (dry bulb temperature) 32 ° C./WB (wet bulb temperature) 27 ° C. is DB (dry bulb temperature) 22.6 ° C./WB (wet). Ball temperature) The air supply 4 of 22.6 ° C. is supplied to the air-conditioning system, and the 20.5 ° C. heat medium coming out of the heat recovery unit 2 returns at 26.2 ° C.

  In the heat recovery unit 2, the front chamber heat exchanger 14 and the rear chamber heat exchanger 15 are in a state of total heat exchange operation. For example, an exhaust 5 with DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) 16 ° C. DB (dry bulb temperature) 23.2 ° C./WB (wet bulb temperature) 23.2 ° C. air is discharged to the atmosphere 6, and the 26.2 ° C. heat medium exiting the outside air processing unit 201 is 20.5 ° C. Come back in.

In this summer mode, as shown in the air diagram of FIG. 11A, the operation can be performed at a large temperature difference between the dry bulb temperature (OA, DB) of the outside air 3 and the wet bulb temperature (RA, DB) of the exhaust 5. .
FIG. 9 shows an operation state in the intermediate period mode (at the time of heating load). In the outside air processing unit 201, all the on-off valves 210 are opened, and each vaporizing humidifier 209 is humidified. In the heat recovery unit 2, an operation similar to that in the intermediate period mode (at the time of heating load) in the previous embodiment shown in FIG. 3 is performed.

  For this reason, in the outside air processing unit 201, the total heat exchange operation is performed. For example, the outside air 3 with DB (dry bulb temperature) 3 ° C./WB (wet bulb temperature) 0 ° C. is DB (dry bulb temperature) 13.0 ° C./WB ( Wet bulb temperature) 9.5 ° C. air supply 4 is supplied to the air-conditioning system, and the 11.7 ° C. heat medium coming out of the heat recovery unit 2 returns at 6.7 ° C.

  In the heat recovery unit 2, the front chamber heat exchanger 14 is subjected to sensible heat exchange operation, and the rear chamber heat exchanger 15 is subjected to total heat exchange operation. For example, DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) Exhaust 5 at 16 ° C. becomes air at DB (dry bulb temperature) 9.0 ° C./WB (wet bulb temperature) 9.0 ° C. and is discharged to the atmosphere 6, and heat at 6.7 ° C. from the outside air processing unit 201 The medium returns at 11.7 ° C.

  In the intermediate period mode (at the time of heating load), as shown in the air diagram of FIG. 11B, humidification in each vaporizing humidifier 209 and heating in each outdoor air heat exchanging unit 205 are repeated, and the outside air 3 The wet bulb temperature (OA, WB) and the exhaust bulb 5 dry bulb temperature (RA, DB) can be operated at a large temperature difference.

  FIG. 10 shows the operation state in the winter mode. In the outside air processing unit 201, the wet bulb temperature of the outside air 3 becomes negative and may freeze, so that it corresponds to each vaporizing humidifier 209 at the most upstream position. Only the on-off valve 210 is closed and humidified in each other vaporizing humidifier 209. In the heat recovery unit 2, the same operation as in the winter mode in the previous embodiment shown in FIG. 4 is performed.

  For this reason, in the outside air processing unit 201, the total heat exchange operation is performed. For example, the outside air 3 of DB (dry bulb temperature) -2 ° C./WB (wet bulb temperature) -5 ° C. is DB (dry bulb temperature) 10.0 ° C. / The supply air 4 of WB (wet bulb temperature) 6.7 ° C. is supplied to the air-conditioning target system, and the 10.1 ° C. heat medium coming out of the heat recovery unit 2 returns at 5.1 ° C.

  In the heat recovery unit 2, the front chamber heat exchanger 14 is subjected to sensible heat exchange operation, and the rear chamber heat exchanger 15 is subjected to total heat exchange operation. For example, DB (dry bulb temperature) 23 ° C./WB (wet bulb temperature) The exhaust 5 at 16 ° C. becomes air at 7.1 ° C./WB (wet bulb temperature) 7.1 ° C./WB (wet bulb temperature) 7.1 ° C. and is discharged to the atmosphere 6, and the 5.1 ° C. heat emitted from the outside air processing unit 201. The medium returns at 10.1 ° C.

  In this winter mode, as shown in the air diagram of FIG. 11 (c), humidification in each vaporizing humidifier 209 and warming in each outdoor air heat exchanging unit 205 are repeated while avoiding freezing. Can be operated at a temperature difference between the dry bulb temperature (OA, DB) and the dry bulb temperature (RA, DB) of the exhaust 5.

FIG. 12 shows another embodiment of the present invention, and the following points are different from the previous embodiment shown in FIG.
In the heat recovery unit 2, the gas inlet 8 and the gas outlet 10 are located at the upper part of the unit, and the vent hole 13 is located at the lower side of the partition wall 12. Further, the preliminary nozzle 25, the on-off valve 32, and the internal circulation line 33 are not provided.

In this configuration, basically the same operation as in the previous embodiment can be performed, and spraying is performed in the opposite direction by the rear chamber 24 in the latter half of the air flow, so that the heat exchange efficiency is improved.
As shown in FIG. 13, it is also possible to exchange heat between the outside air processing unit and the heat recovery unit in the external heat exchange unit.

  In this case, the external return line 19 for the heat recovery unit connected to the rear chamber nozzle 24 and the external feed line 31 for the heat recovery unit communicating with the front chamber storage tank 16 are connected to the external heat exchanger 7. Connect through. In addition, an external return pipe 207 for the outside air processing unit is connected to the heat medium inlet of the outside air heat exchanging unit 209, and the outside air processing unit for the outside air processing unit connected to the external return pipe 207 and the heat medium outlet of the outside air heat exchanging part 209 is connected. The external feed pipe 208 is connected via the external heat exchange unit 7.

The schematic diagram which shows the driving | running state of the summer mode of the air conditioner in embodiment of this invention The schematic diagram which shows the driving | running state of the interim mode (at the time of cooling load) of the air conditioner in the embodiment The schematic diagram which shows the driving | running state of the intermediate period mode (at the time of heating load) of the air conditioner in the embodiment The schematic diagram which shows the driving | running state of the winter mode of the air conditioner in the embodiment Air diagram in each mode of the air conditioner in the same embodiment Air line diagram for conventional air conditioners The schematic diagram which shows the structure of the air conditioner in other embodiment of this invention. The schematic diagram which shows the structure of the air conditioner in other embodiment of this invention, and shows the driving | running state of the summer mode The schematic diagram which shows the driving | running state of the intermediate period mode (at the time of heating load) of the air conditioner in the embodiment The schematic diagram which shows the driving | running state of the winter mode of the air conditioner in the embodiment Air diagram in each mode of the air conditioner in the same embodiment The schematic diagram which shows the structure of the air conditioner in other embodiment of this invention. The schematic diagram which shows the structure of the air conditioner in other embodiment of this invention.

Explanation of symbols

1 Outside air treatment unit 2 Heat recovery unit 3 Outside air 4 Supply air 5 Exhaust air (return air)
6 Atmosphere 7 External heat exchanger 8, 108 Gas inlet 9, 109 Front chamber 10, 110 Gas outlet 11, 111 Rear chamber 12, 112 Partition 13, 113 Vent 14, 114 Front chamber heat exchanger 15, 115 Rear chamber heat Exchanger 16, 116 Front chamber storage tank 17, 117 Rear chamber storage tank 18, 118 Water flow hole 19, 119 Heat medium supply line system 20, 120 Heat exchange section 21, 121 Front chamber nozzle 22a, 122a Heat medium inlet 22b 122b Heat medium outlet 23, 123 Gas-liquid contact medium 24, 124 Rear chamber nozzle 25 Pre-nozzle 26, 126 Internal feed line 26a, 126a Pump 27, 127 Connecting line 28, 128 Three-way valve 29, 129 Internal return pipe Lines 30, 130 External return line 130a Three-way valve 130b Bypass lines 31, 131 External feed lines 31a, 131a Pump 32 On-off valve 3 Internal circulation pipes 34, 134 Overflow pipes 35, 135 Supply water pipe 36 Exhaust fan device 136 Air supply fan device 201 Outside air processing unit 202 Gas inlet 203 Gas outlet 204 Processing chamber 205 Outside air heat exchanging unit 206 Communication pipe 209 Vaporizing humidification 210 On-off valve 211 Water supply pipeline

Claims (8)

The front chamber for introducing the target gas from the gas inlet, the rear chamber for discharging the target gas flowing in from the front chamber from the gas outlet, the front chamber heat exchanger disposed in the front chamber, and the rear chamber heat exchange disposed in the rear chamber And a heat medium supply means for supplying a heat medium to the front chamber heat exchanger and the rear chamber heat exchanger, and the front chamber storage tank and the rear chamber storage tank disposed in the lower part of each of the front chamber and the rear chamber Configure the unit,
The front chamber heat exchanger has a heat exchange section in which the heat medium flows countercurrently to the flow of the target gas, and a front chamber nozzle that sprays the heat medium on the heat exchange section, and the base end is a rear chamber storage tank. Connect the internal feed line of the heat medium supply means communicating with the heat medium inlet of the heat exchanging part, connect the front chamber nozzle and the heat medium outlet of the heat exchanging part with a connecting line, and in the middle of the connecting line The internal return pipe of the heat medium supply means is connected via the pipe switching means, and the tip of the internal return pipe is connected to the front chamber storage tank,
The rear chamber heat exchanger has a gas-liquid contact medium and a rear chamber nozzle that sprays the heat medium on the gas-liquid contact medium, and connects the external return pipe of the heat medium supply means to the rear chamber nozzle. An air conditioner comprising: an external feed line communicating with the front chamber storage tank and an external return line connected via an external heat exchange unit.   It has a pair of processing units, one processing unit is an outside air processing unit that introduces outside air as a target gas into the system, and the other processing unit is a heat recovery unit that discharges exhaust as a target gas outside the system, The air conditioner according to claim 1, wherein heat exchange between the outside air processing unit and the heat recovery unit is performed in the heat exchange unit.   The outside air processing unit is connected to the bypass conduit of the heat medium supplying means via the conduit switching means provided in the middle of the external return conduit of the heat medium supplying means connected to the rear chamber nozzle, and the front end of the bypass conduit is arranged at the rear. The air conditioner according to claim 2, wherein the air conditioner is connected to a chamber storage tank. An outside air processing unit that introduces outside air into the system as a target gas, and a heat recovery unit that discharges exhaust gas outside the system as a target gas,
The heat recovery unit is arranged in the front chamber for introducing the target gas from the gas inlet, the rear chamber for discharging the target gas flowing in from the front chamber from the gas outlet, the front chamber heat exchanger disposed in the front chamber, and the rear chamber. A rear chamber heat exchanger, a front chamber storage tank and a rear chamber storage tank disposed in the lower part of each of the front chamber and the rear chamber, and a heat medium for supplying a heat medium to the front chamber heat exchanger and the rear chamber heat exchanger Supply means,
The front chamber heat exchanger has an exhaust heat exchange section in which the heat medium flows countercurrently to the flow of the target gas, and a front chamber nozzle that sprays the heat medium on the exhaust heat exchange section, with a proximal end at the rear chamber The internal feed line of the heat medium supply means communicating with the storage tank is connected to the heat medium inlet of the exhaust heat exchange part, and the front chamber nozzle and the heat medium outlet of the exhaust heat exchange part are connected by a communication line. In the middle of the path, the internal return pipe of the heat medium supply means is connected via the pipe switching means, and the tip of the internal return pipe is connected to the front chamber storage tank,
The rear chamber heat exchanger has a gas-liquid contact medium and a rear chamber nozzle that sprays the heat medium on the gas-liquid contact medium, and connects the external return pipe of the heat medium supply means to the rear chamber nozzle. Is connected to the external feed line and the external return line of the heat medium supply means communicating with the front chamber storage tank through the outside air processing unit,
The outside air processing unit has a processing chamber for discharging the target gas introduced from the gas inlet from the gas outlet, and the outside air heat exchanging units are arranged in multiple stages along the flow direction of the target gas in the processing chamber. Is connected with a connecting pipe, the external feed pipe of the heat recovery unit is connected to the heat medium inlet of the outdoor air heat exchange section located downstream in the flow direction of the target gas, and the heat recovery unit is connected to the heat medium outlet of the external air heat exchange section. An air conditioner characterized by connecting an external return pipe. An outside air processing unit for introducing outside air into the system as a target gas, and a heat medium supply means for supplying a heat medium to the outside air processing unit and the heat recovery unit, having a heat recovery unit for discharging exhaust gas outside the system as a target gas; , Having an external heat exchanging unit for exchanging heat between the outside air processing unit and the heat recovery unit,
The heat recovery unit is arranged in the front chamber for introducing the target gas from the gas inlet, the rear chamber for discharging the target gas flowing in from the front chamber from the gas outlet, the front chamber heat exchanger disposed in the front chamber, and the rear chamber. A rear chamber heat exchanger, a front chamber storage tank and a rear chamber storage tank disposed at the lower part of each of the front chamber and the rear chamber,
The front chamber heat exchanger has an exhaust heat exchange section in which the heat medium flows countercurrently to the flow of the target gas, and a front chamber nozzle that sprays the heat medium on the exhaust heat exchange section, with a proximal end at the rear chamber The internal feed line of the heat medium supply means communicating with the storage tank is connected to the heat medium inlet of the exhaust heat exchange part, and the front chamber nozzle and the heat medium outlet of the exhaust heat exchange part are connected by a communication line. In the middle of the path, the internal return pipe of the heat medium supply means is connected via the pipe switching means, and the tip of the internal return pipe is connected to the front chamber storage tank,
The rear chamber heat exchanger has a gas-liquid contact medium and a rear chamber nozzle that sprays the heat medium on the gas-liquid contact medium. The rear chamber nozzle is provided with an external return line for a heat recovery unit of the heat medium supply means. Connect this external return line and the external feed line for the heat recovery unit of the heat medium supply means whose base end communicates with the front chamber storage tank via the external heat exchange part,
The outside air processing unit has a processing chamber for discharging the target gas introduced from the gas inlet from the gas outlet, and the outside air heat exchanging units are arranged in multiple stages along the flow direction of the target gas in the processing chamber. The external return pipe for the outside air processing unit of the heat medium supply means is connected to the heat medium inlet of the most downstream outside air heat exchanging section in the flow direction of the target gas. It is characterized in that an external feed line for an external air processing unit of the heat medium supply means connected to the heat medium outlet of the uppermost external air heat exchange section in the flow direction of the target gas is connected via an external heat exchange section. Air conditioner. The air conditioner according to claim 4 or 5, wherein a humidifier is arranged in each outside air heat exchange section of the outside air processing unit.   The heat recovery unit has a pre-nozzle for spraying a heat medium onto the target gas before flowing into the front chamber heat exchanger, and an internal circulation pipe branched from the external feed pipe is connected to the pre-nozzle. The air conditioner according to any one of claims 2 to 6, wherein 8. The air conditioner according to claim 1, wherein the rear chamber heat exchanger always sprays the heat medium from the rear chamber nozzle onto the gas-liquid contact medium, and the front chamber heat exchanger is the target gas. In accordance with the enthalpy of the pipe, the pipe switching means in the middle of the connecting pipe is operated, and the heat medium that has passed through the heat exchanging section is sprayed from the front chamber nozzle to the heat exchanging section and then reaches the front chamber storage tank. A method of operating an air conditioner characterized by switching between a heat exchange operation and a dry sensible heat exchange operation in which a heat medium that has passed through a heat exchange section passes through an internal return pipe and reaches a front chamber storage tank. .

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