JP2006200812A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system capable of carrying out air conditioning that is friendly to the human body even when cold water of 7°C is used, capable of reducing an air conditioning air amount blown out into an air-conditioned space, and reducing a capacity, improving efficiency, or the like of a heat source machine such as a refrigerating machine. <P>SOLUTION: The air conditioning system is provided with a total enthalpy heat exchanger 51 having a total enthalpy heat exchange rotor 61 carrying out total enthalpy heat exchange between introduced outside air and exhaust air which is one part of return air from the air-conditioned space 54 to carry out cooling and dehumidification of the outside air, a dehumidifier 52 having a cold temperature coil 70 cooling air sent from the total enthalpy heat exchanger 51 and a dehumidification rotor 69 dehumidifying air from the cold temperature coil 70, and an air conditioner 53 having a cold temperature coil 75 cooling a mixture of air heated during dehumidification by the dehumidification rotor 69 and sent from the dehumidifier 52, and the return air from the air-conditioned space 54. Air supply from the air conditioner 53 to the air-conditioned space 54 can be carried out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioning system.

For example, when air-conditioning is performed in a congested indoor space where the number of people in the room is about 10,000 and the staff density is 2.5 people / m ² , conventionally, a cold water coil and a hot water coil are used as in the case of general air conditioning. In addition, an air-conditioning system that performs temperature and humidity control of supercooling and reheating is employed, and a conventional example of such an air-conditioning system is shown in FIG.

  In the figure, 1 is an external air conditioner, 2 is an air conditioner, and 3 is an air-conditioned space. Thus, the inside of the housing 1a of the external air conditioner 1 includes a chamber 6 serving as a path through which outside air (fresh air) introduced from the outside through the introduction pipe 4 is fed to the pipe line 5 side, and the pipe line 7 The exhaust gas sent out is divided into a chamber 9 that serves as a path through which the exhaust gas is led out to the outlet pipe 8 side. A rotary heat-driven total heat exchange rotor 10 disposed across the chambers 6 and 9 is disposed in the housing 1a. Is provided. The total heat exchange rotor 10 is a heat exchanger for air conditioning that simultaneously exchanges sensible heat and latent heat of the outside air and exhaust. The flow direction of the outside air in the chamber 6 and the flow direction of the exhaust gas in the chamber 9 are opposite to each other.

  A fan 11 is disposed in the chamber 6 on the upstream side in the outside air flow direction from the total heat exchange rotor 10, and the outside air is sequentially arranged in the outside air flow direction downstream from the total heat exchange rotor 10 in the outside air flow direction. A hot water coil 12 that heats the air, a cold water coil 13 that primarily cools the outside air, and a humidifier 14 that humidifies the outside air as necessary are arranged. In the chamber 9, a fan 15 is disposed upstream of the total heat exchange rotor 10 in the exhaust flow direction.

  In the housing 2a of the air conditioner 2, a chilled water coil 17 for supercooling air mixed with air from the pipeline 5 and return air from the pipeline 16 sequentially from the upstream side to the downstream side in the air flow direction, A hot water coil 18 for heating the air supercooled by the cold water coil 17 and a fan 20 for supplying the air that has passed through the hot water coil 18 to the air-conditioned space 3 as supply air through the pipe line 19 are arranged. Yes.

  The return air from the air-conditioned space 3 can be sent to the pipe line 16, and in the middle of the pipe line 16, the upstream end of the pipe line 7 in the exhaust flow direction so that a part of the return air is exhausted Are connected.

  The warm water coil 12 is connected with a warm water outbound pipeline 21 and a return pipeline 22, and a midway portion of the outbound pipeline 21 is coupled with an outbound pipeline 23 for supplying warm water to the warm water coil 18. A return pipe 24 is connected to the middle part of the return pipe 22 so that hot water returned from the hot water coil 18 is supplied to the return pipe 22.

  The chilled water coil 13 is connected to a chilled water outgoing line 25 and a return line 26, and an intermediate part of the outgoing line 25 is connected to an outgoing line 27 for supplying chilled water to the chilled water coil 17. A return pipe 28 is connected to the middle of the return pipe 26 so that the cold water returned from the cold water coil 17 is fed to the return pipe 26. In the figure, 29, 30, 31, and 32 are on-off valves.

  Next, the operation of the air conditioning system will be described with reference to FIGS. For example, when air conditioning such as cooling is performed in the air conditioning system, the total heat exchange rotor 10 and the fans 11, 15, and 20 are driven, the on-off valve 29 is closed, and the other on-off valves 30, 31, 32 are operated. Is open.

  For this reason, the cold water cooled in the heat source device such as a refrigerator is supplied from the forward conduit 25 to the cold water coil 13 and from the forward conduits 25 and 27 to the cold water coil 17. Returning chilled water from the chilled water coil 13 is returned to the heat source device from the return pipe 26 and return chilled water from the chilled water coil 17 is returned to the heat source device and is circulated through the path again.

  Hot water generated by a heat source device such as a water heater is fed from the pipes 21 and 23 to the hot water coil 18, returned from the hot water coil 18 to the heat source equipment through the pipes 24 and 22, heated and heated again. Circulate.

  Outside air (fresh air) introduced into the chamber 6 of the external air conditioner 1 from the introduction pipe 4 is fed into the chamber 6 by the fan 11, and is exhausted between the exhaust on the chamber 9 side in the total heat exchange rotor 10. Heat and steam are exchanged, cooled and dehumidified. The air cooled and dehumidified in the total heat exchange rotor 10 is supplied to the cold water coil 13 and is primarily cooled by the cold water coil 13 to increase the relative humidity. Thus, the cooled air having an increased relative humidity is introduced from the chamber 6 into the housing 2a of the air conditioner 2 via the pipe line 5. The reason why the outside air is secondarily cooled by the cold water coil 13 is to stably control the temperature and humidity in the cold water coil 17 of the air conditioner 2 by separating the heat treatment of the outside air from the heat treatment in the room.

  The air merges with the return air from the pipe line 16 in the housing 2a, and the air mixed with the return air is supercooled and dehumidified by the cold water coil 17 and reheated by the hot water coil 18 to increase the temperature.

  The dehumidification of the air prevents the human body from being uncomfortable due to high humidity. The reason for heating with the hot water coil 18 is that if the air supply is supplied to the conditioned space 3 without heating, the cooling of the conditioned space 3 is too effective.

  The air heated by the hot water coil 18 is blown to the air-conditioned space 3 by the fan 20 as air supply through the pipe 19 and supplied to the air-conditioned space 3 to cool the air-conditioned space 3, thereby maintaining the air-conditioned space 3 at a predetermined temperature and humidity.

  A part of the return air sent from the air-conditioned space 3 to the pipe line 16 is introduced to the upstream side of the cold water coil 17 of the air conditioner 2 and mixed with the air from the pipe line 5 and circulates again through the above-mentioned path. The air-conditioned space 3 is used for cooling.

  Of the return air, the portion not sent to the air conditioner 2 is sent as exhaust to the chamber 9 of the external air conditioner 1 from the pipe 7, and sent to the total heat exchanging rotor 10 by the fan 15. Heat and water vapor are exchanged between the exchange rotor 10 and the outside air fed through the chamber 6, heated, and the absolute humidity rises and is discharged from the outlet pipe 8 to the outside.

  In the conventional air conditioning system shown in FIG. 3, the dehumidifying capacity of the cold water coil 17 is limited depending on the water supply temperature, so the temperature and humidity conditions of the air-conditioned space 3 are a temperature of 25 ° C., a relative humidity of 60% RH, or a temperature of 26 ° C. In many cases, it was operated at a relative humidity of 50% RH.

On the other hand, as conditions for indoor temperature friendly to the human body, it is desirable to reduce the temperature difference between the outside air temperature and the air-conditioned space 3 and to lower the humidity instead of increasing the temperature of the air-conditioned space 3. A relative humidity of 40% RH is preferred. However, when air conditioning is performed in such a congested air-conditioned space 3 where the number of people in the room is about 10,000 and the personnel density is 2.5 people / m ² due to such room temperature and humidity, the dehumidifying capacity of the cold water coil 17 is reduced. Due to the limit, the air-conditioning airflow becomes enormous.

  That is, for example, in the above air conditioning system, when air conditioning is performed with the outside air condition, the air conditioned space condition, the personnel, the outside air amount, and the cooling load as shown in FIG. 6, the total sensible heat is 750,000 W and the total latent heat is 600,000 W. It becomes. In this case, the necessary dehumidification amount in the air-conditioned space 3 is “total latent heat ÷ evaporation latent heat”, and thus 600,000 W ÷ 672 Wh / Kg≈893 Kg / h.

  Further, in the air conditioning system shown in FIG. 3, when the water supply temperature fed from the heat source device such as a refrigerator to the cold water coil 17 of the air conditioner 2 is 7 ° C. and the cold water coil 17 of the air conditioner 2 is a 12-row coil, The cold water coil 17 can dehumidify to about 10 ° C. DP (7.8 g / kg ′).

In this case, the air-conditioning air flow rate necessary for dehumidifying the air-conditioned space 3 is “required dehumidifying amount ÷ (absolute humidity in the air-conditioned space 3−absolute humidity of supply air blown into the air-conditioned space 3) ÷ specific gravity”. Therefore, 893 kg / h ÷ (0.0089 kg / kg′−0.0078 kg / kg ′) ÷ 1.2 kg / m ³ ≈676,520 m ³ / h.

Thus, since the difference in blow-out temperature, which is the difference between the room temperature of the air-conditioned space 3 and the supply air temperature blown into the air-conditioned space 3, is “sensible heat / (air-conditioning air flow rate × specific heat of supply air)”, 750 , 000 W / (676,520 m ³ × 0.33 W / m ³ · ° C.) ≈3.4 ° C.

  Based on the above calculation results, the outside air (fresh air), supply air, return air, exhaust air flow rate at each predetermined position of the air conditioning system of FIG. 3, the temperature at each predetermined position, and the absolute humidity are shown in FIG. The conventional air conditioning system shown in FIG. 7 is shown in FIG. 7 when the air-conditioning blast volume, primary energy consumption (calculated by calculating consumed oil, coal, gas, electricity, etc.) and heat source unit capacity are shown. (Water supply temperature 7 ° C.) ”.

Further, in the air conditioning system shown in FIG. 3, in order to reduce the air-conditioning air flow rate, the water supply temperature supplied to the cold water coil 17 of the air conditioner 2 from the heat source device such as a refrigerator is 3 ° C. under the design conditions shown in FIG. In the case where the cold water coil 17 is a 12-row coil, if the same calculation as described above is performed, the necessary air-conditioning air flow rate becomes 284,000 m ³ / h, and the indoor temperature of the air-conditioned space 3 and the air-conditioned space 3 The blowout temperature difference, which is the difference in the supply air temperature blown out to the air, is 8.0 ° C., and the outside air (air), supply air, return air, exhaust air flow rate, temperature at each predetermined position, and absolute humidity are shown in FIG. In addition, the air-conditioning blast volume, primary energy consumption, and heat source capacity are as shown in “Conventional air-conditioning system shown in FIG. 3 (water supply temperature 3 ° C.)” in FIG. Thus, in this case, the air-conditioning airflow can be reduced, but the primary energy consumption is slightly increased.

Non-patent document 1 is a prior art document in the case where the occupant personnel and the staff density are high. FIG. 1 and 113 on page 208 of this document show an example of a Tokyo gymnasium as an example of a living area air conditioning system. Thus, the residential area air conditioning system shown in Non-Patent Document 1 includes an external air conditioner and an air conditioner, and the external air conditioner is provided with a total heat exchanger.
Air Conditioning and Sanitation Engineering Handbook 6 Application November 30, 2001 (Heisei 13) November 13th edition 1st edition issuance

  In the conventional air conditioning system shown in FIG. 3, when the water supply temperature of the chilled water supplied to the chilled water coil 17 is 7 ° C., as described above, the chilled water coil 17 is supplied to the conditioned space 3 due to the limit of the dehumidifying capacity. The amount of air-conditioning air blown is huge (see FIG. 4).

  On the other hand, in the air conditioning system as shown in FIG. 3, when the water supply temperature of the cold water supplied to the cold water coil 17 is about 3 ° C., the air supply temperature supplied to the air conditioned space 3 is the cold water coil 17. Since it is decooled by decooling to a low dew point in the air conditioner, the air-conditioning blast volume can be reduced, but it is necessary to cool the chilled water temperature to a lower temperature in a heat source device such as a refrigerator. There have been problems such as limitations, increased external dimensions of the heat source equipment, and reduced efficiency of the heat source equipment. In the case of Non-Patent Document 1, there is a problem similar to that of the air conditioning system shown in FIG.

  In view of the above-described circumstances, the present invention can perform air conditioning that is gentle to the human body even when cold water of 7 ° C. is used, can reduce the amount of air-conditioning air blown to the air-conditioned space, and a refrigerator The purpose of the present invention is to provide an air conditioning system that achieves a reduction in the capacity of the heat source device and the like, and an increase in efficiency.

  The air conditioning system of the present invention includes a total heat exchanger having total heat exchange means for performing total heat exchange between the introduced outside air and exhaust gas that is part of the return air from the air-conditioned space to cool and dehumidify the outside air, A dehumidifier having coil means for cooling the air supplied from the total heat exchanger, and a dehumidifying means for dehumidifying the air from the coil means, and heated when dehumidified by the dehumidifying means and supplied from the dehumidifier Provided with an air conditioner having coil means for cooling air mixed with fresh air and return air from the air-conditioned space, and configured to supply air cooled by the coil means of the air-conditioner to the air-conditioned space It is.

  In the air conditioning system of the present invention, the total heat exchange means is a rotatable total heat exchange rotor, the dehumidification means is a rotatable dehumidification rotor, and the coil means is a cold coil.

  According to the air conditioning system of the present invention, even in the case of air conditioning with the temperature of the cold water fed to the coil means being 7 ° C., the temperature in the air-conditioned space is 27 ° C. friendly to the human body and the relative humidity is about 40% RH. Air conditioning can be maintained, and the amount of air supplied to the air-conditioned space (air-conditioning airflow) can be reduced compared to the case where the water supply temperature of chilled water is set to 7 ° C in the conventional air-conditioning system. Therefore, it is possible to reduce the size of the air conditioner, reduce the air conditioning noise, reduce the diameter of the duct, and further reduce the primary energy consumption and the capacity of the heat source equipment such as the refrigerator as compared with the conventional air conditioning system. It is possible to achieve various excellent effects such as energy saving and cost reduction.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an example of an embodiment for carrying out the present invention. In the figure, 51 is a total heat exchanger, 52 is a dehumidifier, 53 is an air conditioner, and 54 is an air-conditioned space. Thus, the inside of the housing 51a of the total heat exchanger 51 includes a chamber 57 serving as a path through which outside air (fresh air) introduced from the outside through the introduction pipe 55 is supplied to the pipe line 56 side, and the pipe line 58. The exhaust gas sent out is divided into a chamber 60 that serves as a path through which the exhaust gas is led out to the lead-out pipe 59 side. A rotary heat-driving total heat exchange rotor 61 disposed across the chambers 57 and 60 is disposed in the housing 51a. Is provided. The total heat exchange rotor 61 is a heat exchanger for air conditioning that simultaneously exchanges sensible heat and latent heat of the outside air and exhaust.

  A fan 62 is disposed in the chamber 57 upstream of the total heat exchange rotor 61 in the direction of the outside air flow, and a fan 63 is disposed in the chamber 60 upstream of the total heat exchange rotor 61 in the direction of the exhaust gas flow. Yes. Further, the flow direction of the supply air in the chamber 57 and the flow direction of the exhaust gas in the chamber 60 are opposite to each other.

  Inside the housing 52a of the dehumidifier 52, the air 65 introduced from the pipe 56 is supplied to the pipe 64, and the outside air taken in from the pipe 66 is supplied to the pipe 67. The housing 68 is divided into a chamber 68, and a dehumidifying rotor 69 that can be driven to rotate is provided across the chambers 65 and 68. The dehumidifying rotor 69 has a honeycomb structure including, for example, silica gel and is an optimal means for generating low dew point air.

  On the upstream side of the dehumidifying rotor 69 in the chamber 65 in the air flow direction, a cooling / heating coil 70 and a fan 71 for heating and cooling are arranged from the upstream side to the downstream side in the air flow direction. A drying means 72 such as a gas burner is disposed on the upstream side in the outside air flow direction in order to dry and remove moisture trapped in the dehumidification rotor 69. A fan 73 is disposed to send the removed moisture and outside air to the pipe line 67 as exhaust gas. The air flow direction in the chamber 65 and the flow direction of the outside air and exhaust in the chamber 68 are opposite to each other.

  In the housing 53a of the air conditioner 53, in order to cool or heat the air mixed with the air from the pipe 64 and the return air from the pipe 74 sequentially from the upstream side to the downstream side in the air supply flow direction. A cooling / heating coil 75, a humidifier 76 for humidifying air as necessary, and a fan 78 for supplying air to the air-conditioned space 54 as air supply via a pipe line 77 are arranged.

  The return air from the air-conditioned space 54 can be sent to the pipe line 74, and in the middle part of the pipe line 74, upstream of the pipe 58 in the exhaust flow direction so that a part of the return air is exhausted. The ends are connected.

  A cold water or hot water outgoing line 79 and a return pipe 80 are connected to the cold / hot coil 70, and an outgoing line for supplying cold water or hot water to the cold / heated coil 75 in the middle of the outgoing line 79. 81 is connected, and a return pipe 82 is connected to a middle part of the return pipe 80 so that cold water or hot water returned from the cold / hot coil 75 is supplied to the return pipe 80. In the figure, 83 and 84 are on-off valves.

Next, the operation of the above-described embodiment will be described with reference to FIG. 2, FIG. 6, and FIG.
For example, when air conditioning such as cooling is performed in the air conditioning system, the total heat exchange rotor 61, the dehumidifying rotor 69, the fans 62, 63, 71, 73, and 78 are driven, and the on-off valves 83 and 84 are opened. Yes.

  For this reason, the cold water cooled in the heat source device such as a refrigerator is supplied from the forward pipe 79 to the cold coil 70 and also from the forward pipes 79 and 81 to the cold coil 75. The returning chilled water from the cooling / heating coil 70 is returned to the heat source device from the return pipe 80 and the returning chilled water from the cooling / heating coil 75 is returned to the heat source device, and cooled and circulated through the path again.

  Outside air (fresh air) introduced into the chamber 57 of the total heat exchanger 51 from the introduction pipe 55 is fed into the chamber 57 by the fan 62, and is exhausted between the exhaust on the chamber 60 side in the total heat exchange rotor 61. Heat and water vapor are exchanged, cooled and dehumidified, and the cooled and dehumidified air is introduced from the chamber 57 into the chamber 65 in the housing 52a of the dehumidifier 52 via the conduit 56.

  Thus, the air introduced into the chamber 65 is primarily cooled in the cold coil 70 and the relative humidity rises, and is supplied to the dehumidifying rotor 69 by the fan 71. The dehumidifying rotor 69 is heated by a drying means 72 such as a gas burner on the chamber 68 side in order to remove moisture trapped by the dehumidifying material. Therefore, the air supplied to the dehumidifying rotor 69 is dehumidified to become low-humidity air. At the same time, it is heated by the adsorption heat of the dehumidifying material, the temperature rises, and is introduced into the housing 53 a of the air conditioner 53 via the pipe 64. The reason why the air is primarily cooled in the cooling / heating coil 70 is to increase the relative humidity of the air to increase the dehumidifying efficiency of the dehumidifying rotor 69.

  The outside air taken into the chamber 68 of the dehumidifier 52 from the pipe 66 is heated by a drying means 72 such as a gas burner, and the moisture dehumidified from the air by the dehumidifying material of the dehumidifying rotor 69 is evaporated by the heated air, and the evaporated moisture Together with air is exhausted from the pipe 67 to the outside.

  The air merges with the return air from the pipe 74 in the housing 53 a, and the air mixed with the return air is cooled by the cold coil 75. The air cooled to a predetermined temperature by the cooling coil 75 passes through the conduit 77 by the fan 78 and is blown to the air-conditioned space 54 as air supply to be used for cooling the air-conditioned space 54. The air-conditioned space 54 is brought to a predetermined temperature and humidity. Hold.

  A part of the return air sent from the air-conditioned space 54 to the pipe line 74 is introduced to the upstream side of the cooling coil 75 of the air conditioner 53, mixes with the air from the pipe line 64, circulates again through the above-mentioned path, and is air-conditioned. It is used for cooling the space 54.

  The portion of the return air that has not been supplied to the air conditioner 53 is supplied as exhaust to the chamber 60 of the total heat exchanger 51 from the pipe 58, and is supplied to the total heat exchange rotor 61 by the fan 63. Heat and steam are exchanged between the exchange rotor 61 and the outside air fed through the chamber 57, heated, and the absolute humidity rises, and is discharged from the outlet pipe 59 to the outside.

  Next, this example will be described with specific numerical values. For example, in the air conditioning system shown in FIG. 1, air conditioning is performed under the outdoor air conditions, indoor conditions, personnel, outside air volume, and cooling load as shown in FIG. As described above, the total sensible heat is 750,000 W.

  In the air conditioning system shown in FIG. 1, when the water supply temperature fed from a heat source device such as a refrigerator to the cold / hot coil 75 of the air conditioner 53 is 7 ° C. and the cold / hot coil 75 is a 12-row coil, about 10 It can be dehumidified to about DP DP (7.8 g / kg ′) and can be dehumidified to about −7.4 ° C. DP (2 g / kg ′) by the dehumidifying rotor 69 of the dehumidifier 52.

Further, the necessary air-conditioning air flow rate to the air-conditioned space 3 is “sensible heat total ÷ (air temperature difference that is the difference between the supply air temperature from the cold coil 75 and the air-conditioning temperature of the air-conditioned space 54) × specific heat”. 750,000 W / (8 ° C. × 0.33 W / m ³ · ° C.) ≈284,000 m ³ / h.

  Thus, on the basis of the above calculation results, the outside air (fresh air), supply air, return air, and exhaust air flow rate at predetermined positions of the air conditioning system of FIG. 1, the temperature at each predetermined position, and absolute humidity are shown. 2, the air-conditioning blast volume, the primary energy consumption, and the heat source equipment capacity such as a refrigerator are shown as “the air-conditioning system of the present invention shown in FIG. 1 (water supply temperature 7 ° C.)” in FIG. .

  For this reason, according to the illustrated example, even in the case where air conditioning is performed with the temperature of the chilled water fed to the cooling coils 70 and 75 being 7 ° C., the temperature in the air-conditioned space 54 is 27 ° C. and relative humidity is gentle to the human body. Air conditioning can be performed so that the air temperature is maintained at about 40% RH, and the amount of air supplied to the air-conditioned space 54 (air-conditioning air flow rate) in the air-conditioning system of FIG. 3 is set to 7 ° C. The air volume can be reduced, and therefore the air conditioner 53 can be reduced in size, the air conditioning noise can be reduced, the diameter of the ducts 74 and 77 can be reduced, and moreover, compared with the air conditioning system of FIG. , Primary energy consumption, capacity of heat source equipment such as a refrigerator can be reduced, and energy saving and cost reduction can be achieved.

  Note that the air conditioning system of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

It is a conceptual diagram which shows an example of embodiment of the air conditioning system of this invention. FIG. 2 is a conceptual diagram illustrating outside air (fresh air), supply air, return air, and exhaust air flow at predetermined positions of the air conditioning system of FIG. 1, temperature at each predetermined position, and absolute humidity. It is a conceptual diagram which shows an example of the conventional air conditioning system. FIG. 4 is a conceptual diagram showing an example of outside air (fresh air), supply air, return air, and exhaust air flow at predetermined positions of the air conditioning system of FIG. 3, temperature at each predetermined position, and absolute humidity. It is a conceptual diagram which shows the other example of the air volume in each predetermined position of the external air (fresh air), supply air, return air, and exhaust_gas | exhaustion in the predetermined position of the air conditioning system of FIG. It is a graph which shows the design conditions in this invention and the conventional air conditioning system. 7 is a chart showing calculation results obtained based on the design conditions shown in FIG. 6 in the present invention and the conventional air conditioning system.

Explanation of symbols

51 Total Heat Exchanger 52 Dehumidifier 53 Air Conditioner 54 Air Conditioning Space 61 Total Heat Exchange Rotor (Total Heat Exchange Means)
69 Dehumidification rotor (dehumidification means)
70 Cold coil (coil means)
75 Cold coil (coil means)

Claims (4)

  A total heat exchanger having a total heat exchange means for cooling and dehumidifying the outside air by total heat exchange between the introduced outside air and the exhaust gas that is a part of the return air from the air-conditioned space, and the total heat exchanger fed from the total heat exchanger A dehumidifier having coil means for cooling the air and dehumidifying means for dehumidifying the air from the coil means, and air supplied from the dehumidifier after being dehumidified by the dehumidifying means and the air-conditioned space An air conditioning system comprising an air conditioner having coil means for cooling air mixed with return air, and configured to supply air cooled by the coil means of the air conditioner to the conditioned space.   The air conditioning system according to claim 1, wherein the total heat exchange means is a rotatable total heat exchange rotor.   The air conditioning system according to claim 1 or 2, wherein the dehumidifying means is a rotatable dehumidifying rotor.   The air conditioning system according to claim 1, 2 or 3, wherein the coil means is a cold coil.

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