Air-conditioning device and air-conditioning system

Abstract

To provide an air-conditioning device and an air-conditioning system which are inexpensive yet can comfortably maintain indoor temperature and humidity conditions while achieving energy saving.SOLUTION: An air-conditioning device 10 used in combination with an air-conditioning facility 20, includes: a first air-conditioner 11 for cooling intake air or removing humidity therefrom; and a desiccant device 12 which further removes humidity from the intake air. The first air-conditioner 11 takes in at least one of outdoor air OA taken in by the air-conditioning facility 20, return air RA resulting from regeneration of the desiccant device 12, or a mixed air MA of the outdoor air OA taken in by the air-conditioning facility 20 and the return air from a chamber 2. The desiccant device 12 further removes humidity from the cooled or humidity-removed air via the first air conditioner 11 and supplies air SA to the chamber 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning device and an air conditioning system that perform air conditioning using existing or newly installed air conditioning equipment. [Background technology]

[0002] In recent years, energy-saving technologies such as total heat exchangers or variable air volume control devices have been introduced for existing central air conditioning systems. To achieve even greater energy savings with these technologies, it is necessary to replace them with more efficient equipment or implement more precise control with smaller control units. Renovating the heat sources and air conditioners of such existing buildings is expensive, and energy-saving renovations have not progressed much. One such technology has been disclosed: a technology for replacing central air conditioning with a multi-air conditioner for buildings (see Patent Document 1).

[0003] Furthermore, there is a conventional latent heat and sensible heat separation air conditioning system that separates latent heat treatment and sensible heat treatment. A latent heat and sensible heat separation air conditioning system is a method of increasing the efficiency of the chiller by removing the indoor latent heat load using a desiccant air conditioner or the like, and removing the sensible heat load using cold water (medium-temperature water) at a higher temperature than the conventional value. In the case of a central air conditioning system that uses a heat source such as a chiller or a refrigerator, the efficiency of the heat source machine can be improved simply by changing the conventional cold water to high-temperature medium-temperature water. Therefore, if the latent heat load can be removed separately, it is possible to improve the efficiency of a general heat source machine without using any new mechanisms.

[0004] In conventional desiccant dehumidification, the adsorbed moisture is removed from the rotor by heating the exhaust air and lowering the relative humidity, making dehumidification easier. However, preparing a heat source for heating during cooling increases initial costs and requires energy to generate heat, reducing the energy efficiency of the entire system. For this reason, solar heat or cogeneration exhaust heat can be used, but applying this to all buildings requires methods that increase initial costs, such as using a heat recovery heat pump. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-110850 Summary of the Invention [Problem to be solved by the invention]

[0006] For example, when renovating a central air conditioning system 100 to improve its energy-saving performance, it has traditionally been necessary to update the air conditioners to air handling unit (AHU) air conditioners 101 that use hot and cold water for heating and cooling, update the outdoor air conditioners to desiccant outdoor air conditioners 102, update the heat source machines to high-efficiency heat source machines 103, and add a regenerative heat pump 104, as shown in Figure 11, which requires high initial costs.

[0007] An object of the present invention is to provide an air conditioner and an air conditioning system that are low-cost, ensure energy conservation, and maintain comfortable temperature and humidity conditions in a room. [Means for solving the problem]

[0008] The air conditioning device according to the present invention comprises: An air conditioning device that has a first air conditioner that cools or cools and dehumidifies the air taken in and a desiccant device that further dehumidifies the air taken in, and is used in combination with an air conditioning facility, The first air conditioner takes in at least one of outside air taken in by the air conditioning equipment, return air that has been regenerated by the desiccant device, or mixed air that is a mixture of outside air taken in by the air conditioning equipment and return air from a room, The desiccant device further dehumidifies the air cooled or cooled and dehumidified by the first air conditioner and supplies the dehumidified air to the room. It is characterized by:

[0009] In addition, the air conditioning system according to the present invention comprises: The air conditioning device; The air conditioning equipment includes a second air conditioner that cools the air taken in using medium-temperature water that is higher than the cold water generally used in air conditioning, which is between 5 and 7 degrees Celsius, and an outdoor air conditioner that exchanges heat with the outdoor air, or an outdoor air conditioner that has a coil that uses the medium-temperature water and exchanges heat with the outdoor air; Equipped with It is characterized by: [Effects of the Invention]

[0010] The air conditioner and air conditioning system according to the present invention are low-cost and can maintain comfortable indoor temperature and humidity conditions while ensuring energy conservation. [Brief explanation of the drawings]

[0011] [Figure 1] 1 shows an air conditioner 10 according to the present embodiment. [Figure 2] 1 shows an air conditioning system 1 according to a first embodiment. [Figure 3] 1 shows a configuration diagram of one room of an air conditioning system 1 according to a first embodiment. [Figure 4] 1 shows a psychrometric diagram of the configuration of one room of the air conditioning system 1 of the first embodiment. [Figure 5] 1 shows an air conditioning system 1 according to a second embodiment. [Figure 6] 10 shows a configuration diagram of one room of an air conditioning system 1 according to a second embodiment. [Figure 7] 10 shows a psychrometric diagram of the configuration of an air conditioning system 1 of a second embodiment for one room. [Figure 8] 1 shows an air conditioning system 1 according to a third embodiment. [Figure 9] 10 shows a configuration diagram of one room of an air conditioning system 1 according to a third embodiment. [Figure 10] 10 shows a psychrometric diagram of the configuration of an air conditioning system 1 of a third embodiment for one room. [Figure 11] An example of a conventional air conditioning system renovation is shown below. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of an air conditioning device 10 and an air conditioning system 1 according to the present invention will be described with reference to the drawings. The air conditioning system 1 of this embodiment is used by combining an existing or newly installed air conditioning facility 20 and a new air conditioning device 10.

[0013] FIG. 1 shows an air conditioner 10 of this embodiment.

[0014] The air conditioner 10 of this embodiment has a first air conditioner 11 that cools and dehumidifies the air, and a desiccant device 12 that further dehumidifies the air. The first air conditioner 11 and the desiccant device 12 may have a general structure. However, in the air conditioner 10 of this embodiment, the first air conditioner 11 and the desiccant device 12 do not need to be installed integrally, and may be installed separately. Furthermore, the first air conditioner 11 is preferably a packaged air conditioner.

[0015] The first air conditioner 11 takes in one of the outside air OA taken in from the outdoor air conditioning unit 22 described below, the return air RA taken into the first air conditioner 11 directly from the room 2, the return air RA' taken into the first air conditioner 11 after regenerating the desiccant device 12, or mixed air MA obtained by mixing the outside air OA and the return air RA, cools and dehumidifies the air, and sends it to the desiccant device 12. Here, regenerating the desiccant device 12 with the return air RA means bringing the air into a state where it can be dehumidified again by the desiccant device 12.

[0016] The desiccant device 12 dehumidifies the air that has been cooled and dehumidified by the first air conditioner 11 and supplies it as supply air SA to room 2. The desiccant device 12 also regenerates the dehumidification rotor using return air RA from room 2 and sends the air to the first air conditioner 11 or an outdoor air conditioner 22, which will be described later.

[0017] Because the desiccant unit 12 shown in Figure 1 dehumidifies the latent heat load, the air conditioning system 1 (described later) using the air conditioner 10 can achieve energy savings simply by increasing the chilled water temperature of the heat source unit 23. Increasing the chilled water temperature reduces the cooling capacity of the coil of the existing air conditioning equipment 20 (described later). However, the lower discharge temperature of the additional air conditioner 10 can compensate for the insufficient cooling capacity. Even if the cooling capacity of the air conditioner 10 is insufficient, lowering the chilled water temperature increases the coil capacity of the existing or new air conditioning equipment 20, so the chilled water temperature can be controlled according to the load factor of the sensible heat load. In the example of the air conditioning system 1 (described later), energy savings can be achieved by changing the chilled water, which was previously used at approximately 5°C to 7°C, to medium-temperature water (approximately 10°C to 20°C), which has a high refrigeration efficiency. Note that medium-temperature water, preferably 12°C to 15°C, is preferred.

[0018] In an actual building, it is rare for the design condition load to be 100%, so operating the air conditioning system 1 at an appropriate chilled water temperature allows for the most efficient operation. Therefore, by using the air conditioning device 10 of this embodiment, the air conditioning equipment 20 only requires changing the settings, which significantly reduces installation costs compared to replacing the entire heat source unit or air conditioner. Furthermore, if there is an outdoor air conditioning unit with a total heat exchanger, only the first air conditioner 11 and the desiccant unit 12 need to be installed, further reducing the cost of the air conditioning system 1.

[0019] Fig. 2 shows an air conditioning system 1 of the first embodiment. Fig. 3 shows a configuration diagram of one room of the air conditioning system 1 of the first embodiment. The air conditioning system 1 of the first embodiment combines an existing or newly installed air conditioning facility 20 with a new air conditioner 10.

[0020] The air conditioning equipment 20 used in the first embodiment includes a second air conditioner 21, an outdoor air conditioner 22, and a heat source unit 23. The second air conditioner 21 takes in return air RA from room 2, exchanges heat with medium-temperature water flowing in from the heat source unit 23 via a chilled water pipe 23a, and supplies the return air SA to room 2. The outdoor air conditioner 22 takes in outside air OA and discharges exhaust air EA, performing heat exchange. The heat source unit 23 circulates and supplies medium-temperature water, the temperature of which is higher than the approximately 5°C to 7°C used in general air conditioning equipment and provides high refrigeration efficiency, for example, approximately 10°C to 20°C, to the second air conditioner 21. In the case of energy-saving renovation of the air conditioning equipment 20 of the first embodiment, an air conditioner 10 is added by branching off from the existing outdoor air / exhaust duct, and the existing second air conditioner 21, outdoor air conditioner 22, and heat source unit 23 are used as is, with the chilled water set temperature of the heat source unit 23 being raised. The outdoor air-conditioning unit 22 may have a coil using medium-temperature water and exchange heat with the outdoor air OA.

[0021] The air conditioner 10 of the first embodiment has at least a first air conditioner 11 and a desiccant device 12. The first air conditioner 11 of the first embodiment takes in outside air OA and cools and dehumidifies it. The desiccant device 12 dehumidifies the outside air OA that has been cooled and dehumidified by the first air conditioner 11 and supplies it to room 2 as supply air SA. The desiccant device 12 also regenerates the dehumidifying rotor using return air RA from room 2 and discharges it as exhaust air EA. Furthermore, the air conditioner 10 may be a unit in which the fan and dehumidifying rotor are integrated.

[0022] In the air conditioning system 1 of the first embodiment, first, outside air OA taken in by the outdoor air conditioning unit 22 undergoes total heat exchange in the outdoor air conditioning unit 22, is cooled and dehumidified by the first air conditioner 11, is further dehumidified by the desiccant unit 12, and is then supplied to room 2 as supply air SA. In addition, return air RA from room 2 regenerates the dehumidifying rotor of the desiccant unit 12, undergoes total heat exchange in the outdoor air conditioning unit 22, and is then discharged as exhaust air EA. In addition, the second air conditioner 21 takes in return air RA from room 2, cools it, and then blows it into room 2 as supply air SA.

[0023] 4 shows a psychrometric diagram of the configuration for one room of the air conditioning system 1 of the first embodiment. Table 1 shows the energy saving rate of the air conditioning system 1 of the first embodiment.

[0024] [Table 1]

[0025] In the air conditioning system 1 of the first embodiment, the latent heat load is the human body and outdoor air OA, but the outdoor air OA in state (3) shown in FIG. 4 that has been primarily treated with medium-temperature water in the outdoor processing unit 22 has a higher humidity than the humidity in room 2. The air conditioner 10 can treat all of the outdoor air load by cooling and dehumidifying the outdoor air OA in state (3). Therefore, the air conditioning system 1 of the first embodiment has a higher latent heat treatment efficiency and a higher energy saving rate than systems described below.

[0026] Fig. 5 shows an air conditioning system 1 of the second embodiment. Fig. 6 shows a configuration diagram of one room of the air conditioning system 1 of the second embodiment. In the air conditioning system 1 of the second embodiment, a new air conditioner 10 is installed independently in an existing or newly constructed air conditioning facility 20.

[0027] The air conditioning equipment 20 used in the second embodiment includes a second air conditioner 21, an outdoor air conditioner 22, and a heat source unit 23. The second air conditioner 21 takes in outdoor air OA from the outdoor air conditioner 22, exchanges heat with medium-temperature water flowing in from the heat source unit 23 via a chilled water pipe 23a, and supplies the air as supply air SA to room 2. The outdoor air conditioner 22 takes in outdoor air OA and discharges exhaust air EA, performing total heat exchange. The heat source unit 23 circulates and supplies medium-temperature water, the temperature of which is higher than the approximately 5°C to 7°C used in general air conditioning equipment and provides high refrigeration efficiency, for example, approximately 10°C to 20°C, to the second air conditioner 21. In the case of energy-saving renovation of the air conditioning equipment 20 of the second embodiment, the existing second air conditioner 21, outdoor air conditioner 22, and heat source unit 23 can be used as is, and only the set temperature of the chilled water of the heat source unit 23 can be raised. The outdoor air-conditioning unit 22 may have a coil using medium-temperature water and exchange heat with the outdoor air OA.

[0028] The air conditioner 10 of the second embodiment has at least a first air conditioner 11 and a desiccant device 12. The first air conditioner 11 of the first embodiment takes in return air RA and cools and dehumidifies it. The desiccant device 12 further dehumidifies the return air RA that has been cooled and dehumidified by the first air conditioner 11 and supplies it to room 2 as supply air SA. The desiccant device 12 also regenerates a dehumidifying rotor using the return air RA from room 2 and sends it to the first air conditioner 11. Furthermore, the desiccant device 12 may be a unit that integrates a fan and a dehumidifying rotor.

[0029] In the air conditioning system 1 of the second embodiment, first, outside air OA is taken in by the outdoor air conditioning unit 22, where it undergoes total heat exchange, and then cooled by the second air conditioner 21 and supplied to room 2 as supply air SA. Return air RA from room 2 is either taken in by the desiccant unit 12 or taken in by the air conditioning equipment 20. The return air RA taken in by the desiccant unit 12 regenerates the desiccant rotor, is cooled and dehumidified by the first air conditioner 11, is further dehumidified by the desiccant unit 12, and is then supplied to room 2 as supply air SA. A portion of the return air RA taken in by the air conditioning equipment 20 is cooled by the second air conditioner 21 and becomes supply air SA, and the remainder undergoes total heat exchange by the outdoor air conditioning unit 22 and is then discharged as exhaust air EA.

[0030] 7 shows a psychrometric diagram of the configuration for one room of the air conditioning system 1 of the second embodiment. Table 2 shows the energy saving rate of the air conditioning system 1 of the second embodiment.

[0031] [Table 2] The air conditioning system 1 of the second embodiment is similar to the first embodiment in that the latent heat load that could not be processed by the outdoor air-conditioning unit 22 must be processed by the air conditioner 10. However, the return air RA taken in by the desiccant unit 12 is the indoor absolute humidity. The humidity difference with the discharged air is the sum of the human latent heat load and the unprocessed outdoor air latent heat load, and the humidity must be lower than in the first embodiment by the amount of the outdoor air latent heat load. Therefore, the air conditioning system 1 of the second embodiment must lower the outlet temperature of the first air conditioner 11 (shown in (3) of FIG. 7) compared to the first embodiment. This increases the load on the first air conditioner 11, which is less efficient than the heat source unit 23, slightly reducing the efficiency of the entire system. However, the air conditioning system 1 of the second embodiment installs the new first air conditioner 11 and desiccant unit 12 independently of the air conditioning equipment 20, allowing for easy and inexpensive installation.

[0032] Fig. 8 shows an air conditioning system 1 of the third embodiment. Fig. 9 shows a configuration diagram of one room of the air conditioning system 1 of the third embodiment. The air conditioning system 1 of the third embodiment combines an existing or new air conditioning facility 20 with a new air conditioner 10.

[0033] The air conditioning equipment 20 used in the third embodiment includes a second air conditioner 21, an outdoor air conditioner 22, and a heat source unit 23. The second air conditioner 21 takes in outdoor air OA from the outdoor air conditioner 22 and return air RA from room 2, exchanges heat with medium-temperature water that flows in from the heat source unit 23 via a chilled water pipe 23a, and supplies the medium-temperature water to at least one of room 2 or the first air conditioner 11. The outdoor air conditioner 22 takes in outdoor air OA and discharges exhaust air EA, performing total heat exchange. The heat source unit 23 circulates and supplies medium-temperature water, the temperature of which is controlled to a temperature higher than the approximately 5°C to 7°C used in general air conditioning equipment and which has high refrigeration efficiency, for example, approximately 10°C to 20°C, to the second air conditioner 21. In the case of energy-saving renovation of the air conditioning equipment 20 of the third embodiment, the air conditioner 10 may be installed by modifying the outdoor air / exhaust ducts of the existing second air conditioner 21 and outdoor air conditioner 22, and raising the set temperature of the chilled water of the heat source unit 23. The outdoor air conditioner 22 may have a coil that uses medium-temperature water and exchanges heat with the outdoor air OA.

[0034] An air conditioner 10 of the third embodiment has at least a first air conditioner 11 and a desiccant unit 12. The first air conditioner 11 of the air conditioner 10 of the first embodiment takes in mixed air MA of outdoor air OA cooled by a second air conditioner 21 and return air RA, and cools and dehumidifies it. The desiccant unit 12 further dehumidifies the mixed air MA cooled and dehumidified by the first air conditioner 11, and supplies it to room 2 as supply air SA. In addition, the return air RA of room 2 is regenerated by the desiccant unit 12 and sent to the outdoor air conditioner 22. Furthermore, the air conditioner 10 may be a unit in which a fan and a dehumidifying rotor are integrated.

[0035] In the air conditioning system 1 of the third embodiment, first, outdoor air OA taken in from the outdoor air conditioning unit 22 is mixed with return air RA to form mixed air MA. The mixed air MA is cooled by the second air conditioning unit 21, and a portion is supplied to room 2 as supply air SA, with the remainder being taken in by the first air conditioning unit 11. The mixed air MA cooled and dehumidified by the first air conditioning unit 11 is dehumidified by the desiccant unit 12 and supplied to room 2. The return air RA from room 2 is divided into part that is taken in by the desiccant unit 12 and part that is taken in by the second air conditioning unit 21. The return air RA taken in by the desiccant unit 12 regenerates the dehumidifying rotor, undergoes total heat exchange in the outdoor air conditioning unit 22, and is then discharged as exhaust air EA. The return air RA taken in by the second air conditioning unit 21 becomes mixed air MA with outdoor air OA, and is then sent from the second air conditioning unit 21 to the first air conditioner 11 or room 2.

[0036] 10 shows a psychrometric diagram of the configuration for one room of the air conditioning system 1 of the third embodiment. Table 3 shows the energy saving rate of the air conditioning system 1 of the third embodiment.

[0037] [Table 3]

[0038] In the air conditioning system 1 of the third embodiment, outdoor air OA is treated by the outdoor air conditioning unit 22 and the second air conditioning unit 21 and supplied to room 2 as supply air SA. Therefore, as in the third embodiment, the untreated latent heat load supplied as supply air SA to room 2 must be treated by the air conditioning unit 10. Because the inlet humidity of the first air conditioning unit 11 is a mixture of return air RA and outdoor air OA after heat exchange in the outdoor air conditioning unit 22, the outlet humidity is lower and more humid than in the second embodiment. Therefore, the specific enthalpy at the inlet of the air conditioning unit 10, as shown in (4) of FIG. 9, is reduced, reducing the load on the first air conditioning unit 11, which is less efficient than the heat source unit 23, and resulting in energy savings for the entire system. Furthermore, the air conditioning system 1 of the third embodiment can be easily installed at low cost because the air conditioning unit 10 can be installed simply by branching off a portion of the duct of the existing air conditioning equipment 20.

[0039] As described above, the air conditioning system 10 of this embodiment has a first air conditioner 11 that cools and dehumidifies the air taken in and a desiccant device 12 that further dehumidifies the air taken in, and is an air conditioning system 10 that is used in combination with an existing air conditioning facility 20, where the first air conditioner 11 takes in at least one of the outside air OA taken in by the air conditioning facility 20, the return air RA that has been regenerated by the desiccant device 12, or mixed air MA that is a mixture of the outside air OA taken in by the air conditioning facility 20 and the return air RA from room 2, and the desiccant device 12 further dehumidifies the air that has been cooled or cooled and dehumidified by the first air conditioner 11 and supplies it to room 2 as supply air SA.

[0040] Therefore, the air conditioner 10 of this embodiment can be used with an existing or newly installed air conditioning system 20, ensuring energy savings while maintaining comfortable indoor temperature and humidity conditions by controlling humidity independently from the air conditioning system 20 at a low cost. Furthermore, compared to central systems using large desiccant outdoor air processing air conditioners, the air conditioner 10 of this embodiment allows for smaller dehumidification control units, enabling more precise control and improving comfort. Furthermore, the smaller control units of the air conditioner 10 of this embodiment enable optimization, suppressing overshoot, and achieving greater energy savings than control using larger units. Furthermore, the air conditioner 10 of this embodiment uses the first air conditioner 11, which reduces its capacity and allows it to be installed inside the ceiling, thereby saving space. Furthermore, while typical desiccant systems require both a cold heat source and a regenerative hot heat source, the air conditioner 10 of this embodiment uses a room-temperature regeneration system, eliminating the need for a hot heat source. Furthermore, in the case of a central room temperature regeneration system, a low temperature heat source similar to that used in general systems is required for pre-cooling before the desiccant rotor, and a cold heat source is required in addition to the medium temperature heat source for the base air conditioner. However, the air conditioning device 10 of this embodiment uses the first air conditioner 11 as the low temperature heat source, so there is no need to have two large cold heat sources, which allows for space saving and low cost.

[0041] The air conditioner 10 of this embodiment also has an outdoor unit 13 that sends refrigerant to the first air conditioner 11 and circulates the refrigerant to exchange heat. Therefore, the air conditioner 10 of this embodiment can maintain more comfortable indoor temperature and humidity conditions.

[0042] The air conditioning system 1 of this embodiment includes the air conditioning device 10, and an air conditioning facility 20 having a second air conditioner 21 that cools the air taken in using medium-temperature water that is higher than the cold water typically used in air conditioning, between 5 and 7 degrees Celsius, and an outdoor air conditioning unit 22 that exchanges heat with outside air, or an outdoor air conditioning unit 22 that has a coil that uses medium-temperature water and exchanges heat with outside air. Therefore, the air conditioning system 1 of this embodiment does not require high installation costs by using the air conditioning facility 20, and can maintain comfortable indoor temperature and humidity conditions while ensuring energy conservation at a low cost.

[0043] Furthermore, in the air conditioning system 1 of this embodiment, the outside air OA is heat exchanged in the outdoor air conditioning unit 22, cooled or cooled and dehumidified in the first air conditioning unit 11, further dehumidified in the desiccant unit 12, and supplied to room 2 as supply air SA, and part of the return air RA of room 2 is cooled in the second air conditioning unit 21 and supplied to room 2 as supply air SA, with the remainder regenerating the desiccant unit 12, undergoing heat exchange in the outdoor air conditioning unit 22, and being discharged as exhaust air EA. Therefore, the air conditioning system 1 of this embodiment can increase the efficiency of latent heat treatment and the energy saving rate.

[0044] Furthermore, in the air conditioning system 1 of this embodiment, the outside air OA is heat exchanged in the outdoor air conditioning unit 22, cooled in the second air conditioning unit 21, and supplied to room 2 as supply air SA, a portion of the return air RA of room 2 is cooled or cooled and dehumidified in the first air conditioning unit 11 after regenerating the desiccant unit 12, and further dehumidified in the desiccant unit 12 and supplied to room 2 as supply air SA, a remaining portion is mixed with the outside air OA and cooled in the second air conditioning unit 21 as mixed air MA, and the remaining portion is heat exchanged in the outdoor air conditioning unit 22 and discharged as exhaust air EA. Therefore, in the air conditioning system 1 of this embodiment, a new air conditioning unit 10 is installed independently of the air conditioning equipment 20, and therefore can be easily installed at low cost.

[0045] Furthermore, in the air conditioning system 1 of this embodiment, the outdoor air OA is heat exchanged in the outdoor air conditioning unit 22 and cooled in the second air conditioning unit 21, a portion of which is supplied to room 2 as supply air SA, the remainder of which is cooled or cooled and dehumidified in the first air conditioning unit 11, further dehumidified in the desiccant unit 12, and supplied to room 2 as supply air SA, and a portion of the return air RA of room 2 is mixed with the outdoor air OA and cooled in the second air conditioning unit 21 as mixed air MA, the remainder of which regenerates the desiccant unit 12, is heat exchanged in the outdoor air conditioning unit 22, and is discharged as exhaust air EA. Therefore, although the air conditioning system 1 of this embodiment uses medium-temperature water, which has high refrigeration efficiency, in the first air conditioning unit 11 and the outdoor air conditioning unit 22, the dehumidification capacity that is insufficient due to the use of medium-temperature water can be compensated for by the air conditioning unit 10, thereby achieving energy conservation while maintaining the indoor environment. Furthermore, the air conditioning system 1 of this embodiment can be easily installed at low cost because the air conditioner 10 can be installed simply by branching off a portion of the duct of the existing air conditioning equipment 20.

[0046] Furthermore, in the air conditioning system 1 of this embodiment, the air conditioning equipment 20 sends medium-temperature water to the second air conditioner 21 and the outdoor air conditioner 22, and also has a heat source unit 23 that circulates the medium-temperature water to exchange heat. Therefore, the air conditioning system 1 of this embodiment can improve the efficiency of the heat source unit and achieve energy savings.

[0047] It should be noted that the present invention is not limited to these embodiments, and that although the description of the embodiments includes many specific details for illustrative purposes, those skilled in the art may make various variations and modifications to these details.

[0048] For example, the first air conditioner 11 of this embodiment may only perform cooling rather than cooling and dehumidification depending on the inlet air conditions. The outdoor air conditioner 22 may also perform a certain level of cooling and dehumidification by installing a coil in addition to total heat exchange. Furthermore, the outdoor air conditioner 22 may also perform a certain level of cooling and dehumidification by using only a coil when exhaust air cannot be obtained.

[0049] Furthermore, the first air conditioner 11 is preferably a packaged air conditioner, and the second air conditioner 21 is preferably an air handling unit. [Explanation of symbols]

[0050] 1. Air conditioning system 2...room 10...Air conditioner 11...First air conditioner (package air conditioner) 12...Desiccant device 13…Outdoor unit 20…Air conditioning equipment 21...Second air conditioner (air handling unit) 22...Outside conditioning machine 23…Heat source machine

Claims

1. An air conditioning device that has a first air conditioner that cools or cools and dehumidifies the air taken in and a desiccant device that further dehumidifies the air taken in, and is used in combination with an air conditioning facility, The first air conditioner takes in at least one of outside air taken in by the air conditioning equipment, return air that has been regenerated by the desiccant device, or mixed air that is a mixture of outside air taken in by the air conditioning equipment and return air from a room, The desiccant device further dehumidifies the air cooled or cooled and dehumidified by the first air conditioner and supplies the dehumidified air to the room. An air conditioning device characterized by:

2. an outdoor unit that sends a refrigerant to the first air conditioner and circulates the refrigerant to exchange heat; 2. The air conditioning system according to claim 1.

3. The air conditioning device according to claim 1 or 2; the air conditioning equipment including a second air conditioner that cools the air taken in using medium-temperature water of 10 to 20 degrees Celsius, which is higher in temperature than the cold water of 5 to 7 degrees Celsius that is generally used for air conditioning and has high refrigeration efficiency, and an outdoor air conditioner that exchanges heat with the outdoor air, or an outdoor air conditioner that has a coil that uses the medium-temperature water and exchanges heat with the outdoor air; Equipped with An air conditioning system characterized by:

4. The outside air is heat exchanged by the outdoor air conditioning unit, cooled or cooled and dehumidified by the first air conditioner, further dehumidified by the desiccant device, and supplied to the room as supply air, A portion of the return air from the room is cooled by the second air conditioner and supplied to the room as supply air, and the remainder regenerates the desiccant device, undergoes heat exchange in the outdoor air conditioner, and is discharged as exhaust air.

4. The air conditioning system according to claim 3.

5. The outside air is heat exchanged by the outside air conditioning unit, cooled by the second air conditioning unit, and supplied to the room as supply air, A portion of the return air from the room is cooled or cooled and dehumidified by the first air conditioner after regenerating the desiccant device, further dehumidified by the desiccant device, and supplied to the room as supply air; a remaining portion is mixed with the outside air and cooled as the mixed air by the second air conditioner; and the remaining portion is heat exchanged by the outside air conditioner and discharged as exhaust air.

4. The air conditioning system according to claim 3.

6. The outside air is heat exchanged by the outside air conditioning unit, cooled by the second air conditioning unit, a portion of which is supplied to the room as supply air, and the remainder is cooled or cooled and dehumidified by the first air conditioning unit, further dehumidified by the desiccant device, and supplied to the room as supply air, A part of the return air of the room is mixed with the outside air and cooled as the mixed air by the second air conditioner, The remainder is regenerated in the desiccant unit, then heat-exchanged in the outdoor air conditioner and discharged as exhaust air.

4. The air conditioning system according to claim 3.

7. The air conditioning equipment supplies the medium-temperature water to the second air conditioner and the outdoor air conditioner, and includes a heat source unit that circulates the medium-temperature water to exchange heat.

4. The air conditioning system according to claim 3.

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