JP2010145007A - Desiccant air conditioning system, and method for desiccant air conditioning using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desiccant air conditioning system capable of sufficiently stably securing heat quantity necessary for regenerating desiccant. <P>SOLUTION: This desiccant air conditioning system 1 capable of dehumidifying a room R, includes a heat pump unit 3 performing a supercritical pressure cycle, an air conditioner body 5 for heating and cooling the room R, a desiccant unit 2 having a desiccant part 21 and a hot water heater 22 for regenerating the desiccant part 21, and a hot water supply unit 4 for supplying the hot water heated by the radiator 32 of the heat pump unit 3 to the hot water heater 22 of the desiccant unit 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a desiccant air conditioning system and a desiccant air conditioning method using the same.

Conventionally, a desiccant air conditioning system using a desiccant for dehumidifying the room has been proposed. For example, the desiccant air conditioning system of Patent Document 1 dehumidifies outside air through a desiccant type air conditioning unit and then sends it to the air conditioner main body. By passing outside air through the desiccant of the desiccant type air conditioning unit, the moisture in the outside air is adsorbed to the desiccant. The water is released and regenerated.
JP 2002-303433 A

  By the way, the said desiccant air-conditioning system uses the refrigerant | coolant which was sent to the compressor from the evaporator of the air conditioner main body, and was compressed with the compressor and became high temperature as a heat source of the regenerator for reproducing | regenerating a desiccant. However, with this method, there is a possibility that a heat source for regenerating the desiccant cannot be secured stably.

  Then, this invention makes it a subject to provide the desiccant air-conditioning system and desiccant air-conditioning method which can ensure the heat quantity required for reproduction | regeneration of a desiccant stably enough.

  A desiccant air-conditioning system according to the present invention has been made to solve the above problems, and is a desiccant air-conditioning system capable of dehumidifying a room, and includes a compressor, a radiator, an expansion valve, and an evaporator, A heat pump unit that uses carbon as a refrigerant and discharges the compressor at a critical pressure or higher, an air conditioner main body that cools and heats the room, a desiccant part that adsorbs moisture in the air, and a hot water heater for regenerating the desiccant part A hot water supply unit that supplies hot water heated by a radiator of the heat pump unit to a hot water heater of the desiccant unit, and a supply air flow that sends outside air into the room via the desiccant unit and the air conditioner body A passage, an exhaust passage for discharging indoor air to the outside through the desiccant unit, and indoor air And it includes a first circulation passage for returning back into the room sent to the desiccant unit, and a second circulation passage for returning the indoor air to the back chamber feed to the air conditioner body.

  The heat source of the hot water heater that regenerates the desiccant part of the desiccant air conditioning system according to the present invention is a radiator of the heat pump unit. Since this heat pump unit performs a so-called supercritical pressure cycle in which carbon dioxide, which is a refrigerant, is compressed to a critical pressure or higher by a compressor, the refrigerant discharged from the compressor and flowing in the radiator becomes relatively high in temperature. For this reason, the hot water heated by this radiator and supplied to the hot water heater also becomes a high temperature, and the heat source of the hot water heater can be secured stably.

The first desiccant air-conditioning method according to the present invention is an air-conditioning method using the desiccant air-conditioning system, wherein the outside air treatment is the amount of outside air that is processed by the desiccant unit from the air supply passage and sent into the room. The air volume Q _OA m ³ / h and the desiccant processing air volume Q _DES m ³ / h that is the maximum air volume that can be processed by the desiccant unit are adjusted so as to satisfy the following formula.
Q _OA <a ・ Q _DES + b
Q _DES ≧ 150
(However, a and b are constants determined by an air conditioner air volume Q _AC m ³ / h, which is an air volume processed by the air conditioner body.)
By cooling the room under such conditions, it is possible to prevent the occurrence of condensation in the room and the air conditioner body.

The second desiccant air-conditioning method according to the present invention is an air-conditioning method using the desiccant air-conditioning system, and is an outside air process that is an air volume of the outside air that is processed by the desiccant unit from the air supply passage and sent into the room. The air volume Q _OA m ³ / h and the air conditioner air volume Q _AC m ³ / h, which is the air volume processed by the air conditioner main body, are adjusted so as to satisfy the following expression.
Q _OA <c · Q _AC ² + d · Q _AC + e
Q _AC ≧ 400
(Where c, d, and e are constants determined by the desiccant processing air volume Q _DES m ³ / h, which is the maximum air volume that can be processed by the desiccant unit.)
By cooling the room under such conditions, it is possible to prevent the occurrence of condensation in the room and the air conditioner body.

  According to the present invention, it is an object to provide a desiccant air conditioning system and a desiccant air conditioning method capable of sufficiently stably securing the amount of heat necessary for regeneration of a desiccant part.

  Hereinafter, an embodiment of a desiccant air conditioning system according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a desiccant air conditioning system.

  As shown in FIG. 1, a desiccant air conditioning system 1 includes a desiccant unit 2 that adjusts the humidity of air, a heat pump unit 3 that produces hot water as a heat source of the desiccant unit 2, and hot water heaters 22 and 23 of the desiccant unit 2. A hot water supply unit 4 for supplying hot water and an air conditioner body 5 for cooling and heating the room R are provided. The desiccant air conditioning system 1 includes an air supply channel 6, an exhaust channel 7, a first circulation channel 8, and a second circulation channel 9. The air supply passage 6 is a passage through which the outside air taken in from the outside passes through the desiccant unit 2 and the air conditioner body 5 and is taken into the room R. The exhaust passage 7 discharges the air in the room R to the outside through the desiccant unit. This is a flow path. The first circulation flow path 8 is a flow path for returning the air in the room R to the room R again through the desiccant unit 2 and the air conditioner body 5, and the second circulation flow path 9 is for the air in the room R to be returned to the air conditioner body. 5 is a flow path that returns to the room R through 5 again. In addition, an air supply fan 10 that sends outside air into the room and an exhaust fan 11 that discharges room air to the outside are installed. Note that an auxiliary exhaust passage 71 for taking in outside air from the outside is provided because the exhaust passage 7 alone may not provide a sufficient air volume to regenerate the desiccant rotor 21.

  The desiccant unit 2 is installed so as to face a desiccant rotor (desiccant part) 21 that is rotatably installed, a first hot water heater 22 that is placed so as to face the upper part of the desiccant rotor 21, and a lower part of the desiccant roller 21. The second hot water heater 23 is provided. The 1st warm water heater 22 and the 2nd warm water heater 23 are installed via the desiccant rotor 21 in between so that the desiccant rotor 21 may be pinched | interposed.

  The desiccant rotor 21 is formed in a disk shape having a honeycomb structure, and is configured to allow air to pass in the thickness direction. The desiccant rotor 21 is formed of a polymer sorbent, silica gel, zeolite, or the like so that moisture in the air that has passed through can be adsorbed. Further, when high-temperature air passes, the adsorbed moisture is taken away by the air and regenerated. The desiccant rotor 21 rotates in the circumferential direction at a low speed.

  The first hot water heater 22 and the second hot water heater 23 use hot water heated by a radiator 32 of the heat pump unit 3 to be described later as a heat source, and the hot water flows inside. In the cooling and dehumidifying operation, hot water flows only in the first hot water heater 22, and in the heating and humidifying operation, hot water flows only in the second hot water heater 23.

  In the heat pump unit 3, a compressor 31, a radiator 32, an expansion valve 33, and an evaporator 34 are sequentially connected in an annular shape, and carbon dioxide as a refrigerant circulates inside. The compressor 31 is configured to compress and discharge the refrigerant to a critical pressure or higher. The radiator 32 is configured to dissipate the heat of the refrigerant flowing inside the water flowing in the heat exchanger 41 of the hot water supply unit 4 described later. The expansion valve 33 is configured to rapidly depressurize the refrigerant, and the evaporator 34 is configured to evaporate the refrigerant flowing inside.

  The hot water supply unit 4 includes a heat exchanger 41 disposed at a position facing the radiator 32 of the heat pump unit 3 and a hot water storage tank 42 in which hot water heated by the heat radiation of the refrigerant is stored. A water supply pipe 43 for supplying tap water into the hot water storage tank 42 is connected to the lower part of the hot water storage tank 42. A hot water supply pipe 44 for supplying hot water in the hot water storage tank 42 to the hot water heaters 22 and 23 of the desiccant unit 4 is connected to the upper part of the hot water storage tank 42. In this embodiment, the hot water supply pipe 44 is connected only to each of the hot water heaters 22 and 23. However, in actuality, the hot water supply pipe 44 is branched into a plurality and connected to a floor heater or a bathroom. A circulation pipe 45 is connected to the lower part and the upper part of the hot water storage tank 42 to send the water supplied from the water supply pipe 43 into the hot water storage tank 42 to the heat exchanger 41 to heat it and return it to the hot water storage tank 42 again. Yes.

  Next, a cooling / dehumidifying operation method for performing dehumidification while cooling the room using the desiccant air conditioning system configured as described above will be described.

  In the indoor cooling and dehumidifying operation, only the first hot water heater 22 is heated without heating the second hot water heater 23. The first hot water heater 22 uses hot water stored in the hot water storage tank 42 of the hot water supply unit 4 as a heat source. The method for heating the water in the hot water storage tank 42 will be described. The water sent from the water supply pipe 43 to the hot water storage tank 42 is sent to the heat exchanger 41 through the circulation pipe 45, and the heat pump unit 3 is heated. Is heated by the refrigerant flowing in the radiator 32 to be warm water and returned to the hot water storage tank 42. In the heat pump unit 3, the refrigerant (carbon dioxide) which has been compressed to a critical pressure or higher by the compressor 31 to become a high temperature and high pressure is sent to the radiator 32. The refrigerant in the radiator 32 radiates heat to the water flowing in the heat exchanger 41 of the hot water supply unit 4, whereby the water flowing in the heat exchanger 41 is heated. In addition, since the refrigerant itself is in a supercritical pressure state, the temperature is reduced without being condensed and is sent to the expansion valve 33. Then, the refrigerant is depressurized by the expansion valve 33, becomes wet steam, and is sent to the evaporator 34. In the evaporator 34, it is evaporated by absorbing heat from the outside air, becomes saturated steam, and is sent to the compressor 31 again. By repeating the above cycle, the water flowing in the heat exchanger 41 of the hot water supply unit 4 is heated and hot water is stored in the hot water storage tank 42.

  The hot water in the hot water storage tank 42 generated in this way is sent to the first hot water heater 22 via the hot water supply pipe 44 and the first hot water heater 22 is heated. The hot water supply pipe 44 is branched into two from a switching valve 46 provided in the middle, one connected to the first hot water heater 22 and the other to the second hot water heater 23. It is connected. By controlling the switching valve 46, the hot water in the hot water storage tank 42 can be selectively sent to the first hot water heater 22 or the second hot water heater 23.

  Next, a cooling / dehumidifying operation method using the first hot water heater 22 heated as described above will be described. First, in the room R, outside air is supplied from the air supply channel 6 for ventilation, and air in the room R is discharged to the outdoors through the discharge channel 7. The outside air supplied to the room R via the air supply channel 6 once passes through the desiccant rotor 21, moisture is adsorbed to the desiccant rotor 21, and is cooled by the air conditioner body 5 before being supplied to the room R. . In addition, the air sent to the outside through the exhaust passage 7 is heated by the first hot water heater 22 and passes through the desiccant rotor 21 in a state of high temperature, and the desiccant rotor 21 is adsorbed. The desiccant rotor 21 is regenerated by removing moisture. Since the desiccant rotor 21 rotates at a low speed, the lower part that has absorbed moisture from the air flowing through the air supply flow path 6 and the first circulation flow path 8 moves upward, and the air flowing through the exhaust flow path 7 causes moisture to flow. Is released and played. It should be noted that the amount of air that can sufficiently regenerate the desiccant rotor 21 is not the only amount of air that is exhausted to the outside through the exhaust flow path 7. Playing. Further, in order to cool the air in the room R, the air in the room R flows through the first and second circulation channels 8 and 9. The air that has flowed through the first circulation channel 8 passes through the desiccant rotor 21 to absorb moisture and is cooled by the air conditioner body 5 and returned to the room R again. The air that has flowed is cooled by the air conditioner body 5 without passing through the desiccant rotor 21 and returned to the room R. As described above, the room R is ventilated and the air is dehumidified.

As a result of the simulation, it was found that the non-condensing operation is established by performing the cooling and dehumidifying operation under the following conditions. That is, when air conditioning airflow Q _AC is the air volume which is delivered to the room R is cooled by the air conditioner main body 5 is constant, the outside air processing air volume is the amount of air being processed by the desiccant rotor 21 flows through the air supply channel 6 and Q _OA, may be a non-condensation operation by and the desiccant process air volume Q _DES is the maximum amount of wind desiccant rotor 21 can handle adjusting each air volume so as to satisfy the following relation. The non-condensing operation is an operation in which no condensation occurs in the room and no condensation occurs in the air conditioner body.
Q _OA <a ・ Q _DES + b
Q _DES ≧ 150
The unit of each air volume Q is m ³ / h. Moreover, a and b are constants determined by the air conditioner air volume Q _AC .
a = 0.048Q _AC +1.0181,
b = −19.033Q _AC −106.06
It is expressed by the following formula. Typical values of a and b obtained from the simulation results are shown in Table 1 below. Also, Figure 2 shows the graph showing the non-condensation operation range of each air-conditioned air volume Q _AC. The area below each line of the graph is a non-condensing area where non-condensing operation is established.

In addition, the condition that the non-condensing operation is established when the desiccant processing air volume Q _DES is constant is that no adjustment is made by adjusting each air volume so that the outside air processing air volume Q _OA and the air conditioner air volume Q _AC satisfy the following equations. Condensation operation can be performed.
Q _OA <c · Q _AC ² + d · Q _AC + e
Q _AC ≧ 400
Note that c, d, and e are constants determined by the desiccant processing air volume Q _DES , and the values are as shown in Table 2 from the simulation results. Further, FIG. 3 shows a graph showing the non-condensation operation range for each desiccant process air volume Q _DES. The area below each line of the graph is a non-condensing area where non-condensing operation is established.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the above embodiment, the cooling and dehumidifying operation is performed by the desiccant air conditioning system 1, but the heating and humidifying operation can also be performed. In this case, first, only the second hot water heater 23 is heated. The heating method of the second hot water heater 23 is the same as the heating method of the first hot water heater 22 described above, and the hot water supply pipe 44 is switched by the switching valve 46 so that the hot water does not flow through the first hot water heater 22. Hot water is supplied only to the second hot water heater 23. As described above, when hot water is supplied only to the second hot water heater 23 and the air flowing through the exhaust passage 7 and the auxiliary exhaust passage 71 passes through the desiccant rotor 21, moisture is adsorbed to the desiccant rotor 21. Then, the moisture adsorbed on the desiccant rotor 21 is taken away by the air from the air supply passage 6 and the first circulation passage 8 heated by the second hot water heater 23, and the air having increased humidity is sent to the room R. As a result, the room R can be humidified.

1 is a schematic view showing an embodiment of a desiccant air conditioning system according to the present invention. It is the graph which showed the conditions in which a non-condensing driving | operation is materialized. It is the graph which showed the conditions in which a non-condensing driving | operation is materialized.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Desiccant air conditioning system 2 Desiccant unit 21 Desiccant rotor 22 1st hot water heater 23 2nd hot water heater 3 Heat pump unit 4 Hot water supply unit 5 Air conditioner main body 6 Air supply flow path 7 Exhaust flow path 8 First circulation flow path 9 First 2 circulation channels

Claims (3)

A desiccant air conditioning system that can dehumidify the room,
A heat pump unit having a compressor, a radiator, an expansion valve, and an evaporator, and using carbon dioxide as a refrigerant and setting the discharge pressure of the compressor to a critical pressure or higher;
An air conditioner body that heats and cools the room,
A desiccant unit that adsorbs moisture in the air, and a desiccant unit having a hot water heater for regenerating the desiccant unit;
A hot water supply unit for supplying hot water heated by a radiator of the heat pump unit to a hot water heater of the desiccant unit;
An air supply passage for sending outside air into the room through the desiccant part and the air conditioner body;
An exhaust passage for exhausting indoor air to the outside through the hot water heater and the desiccant unit;
A first circulation channel for sending room air to the desiccant unit and returning it to the room again;
A second circulation channel for sending indoor air to the air conditioner body and returning it to the room again;
A desiccant air conditioning system. An air conditioning method using the desiccant air conditioning system according to claim 1,
An outside air processing air volume Q _OA m ³ / h which is an air volume of the outside air which is processed into the desiccant section from the air supply flow path and sent into the room, and a desiccant processing air volume Q _DES m ³ which is the maximum air volume which can be processed by the desiccant section. A desiccant air conditioning method in which / h is adjusted to satisfy the following expression.
Q _OA <a ・ Q _DES + b
Q _DES ≧ 150
(However, a and b are constants determined by an air conditioner air volume Q _AC m ³ / h, which is an air volume processed by the air conditioner body.) An air conditioning method using the desiccant air conditioning system according to claim 1,
An outside air processing air volume Q _OA m ³ / h which is an air volume of the outside air which is processed by the desiccant section and sent into the room from the air supply flow path, and an air conditioner air volume Q _AC m ³ / h which is an air volume processed by the air conditioner main body. And a desiccant air conditioning method that adjusts to satisfy the following formula.
Q _OA <c · Q _AC ² + d · Q _AC + e
Q _AC ≧ 400
(Where c, d, and e are constants determined by the desiccant processing air volume Q _DES m ³ / h, which is the maximum air volume that can be processed by the desiccant unit.)