JP2000205599A - Desiccant air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a system to execute desiccant air-conditioning without using a vaporization type evaporator. SOLUTION: This system partitions an air passage area, positioned on the end face side of a dehumidification device 2 having a rotatable dehumidification rotor, in a rotation direction order into a dehumidification section 2a, a cooling section 2b, and a regeneration section 2c. After outside air OA serving as treating air is introduced in the dehumidification section 2a and dehumidified, the air is heat-exchanged with return air RA from a room R at a sensible heat heat-exchanger 11. After heat-exchanged and temperature-decreased air is introduced in the cooling section 2b for humidifying and cooling, the air is supplied as supply air SA to the room R. After air heat-exchanged at the sensible heat heat-exchanger 11 and increased in temperature is heated by a regeneration heater 12, the air is introduced in the regeneration section 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desiccant air conditioning system capable of supplying low-temperature air without using a vaporizing humidifier.

[0002]

2. Description of the Related Art A desiccant air conditioning method is an air conditioning method in which air is dehumidified by a desiccant, cooled by a heat exchanger, and then humidified to obtain low-temperature air. It is a preferred air conditioning method for the global environment because it does not use chlorofluorocarbon. For example, JP-A-5-115737, "Deodorizing, dehumidifying and cooling method using an adsorbent having a deodorizing and dehumidifying function", and JP-A-8-161151, "Heat exchange" -Type dehumidifier ", JP-A-9-19-1
78289 "desiccant air conditioner", JP-A-9-178
290 "desiccant air conditioner", JP-A-9-17829
1 "Desicant air conditioner".

A typical system configuration of these conventional desiccant air conditioning systems will be described with reference to FIG. The system shown in FIG. 8 is constructed by a whole outside air system, and the outside air O introduced by the air supply fan 101 is used.
A is dehumidified by the dehumidification rotor 102, is then heat-exchanged with the return air RA by the sensible heat exchanger 103, and is then introduced into the vaporizing humidifier 104. Then, after being cooled by evaporation in the humidifier 104, it is supplied to the chamber R as air supply SA.

[0004] The return air RA from the chamber R is a vaporized humidifier 1.
After evaporative cooling in step 05 to reduce the temperature, the heat is exchanged in the sensible heat exchanger 103, and then the temperature is increased by the regeneration heater, then introduced into the dehumidification rotor 102 as regeneration air, and exhausted by the exhaust fan 107. The air is exhausted to the outside as EA.

FIGS. 9 and 10 show the state diagrams of air in the conventional system. In this system, both the capacity and the efficiency change depending on the outside air condition, and therefore, two outside air conditions were examined. FIG. 9 shows that the outside air condition is a temperature of 32 ° C. and a relative humidity of 6
5% (absolute humidity 20 g / kg ').
Is a case where the outside air condition is a temperature of 32 ° C. and a relative humidity of 41% (absolute humidity of 12 g / kg ′). 9 and FIG. 10 indicate the state of air at the same reference numerals in the system shown in FIG.

[0006]

However, in the above-mentioned conventional system, there is a problem that water management is troublesome because a vaporizing humidifier is used. That is, for example, when the intermittent operation is performed, bacteria may be generated in the water on the surface of the humidifier, and an odor may be generated. Therefore, management of the quality of the water used and maintenance of the humidifier itself were troublesome. Therefore, the conventional system is not always satisfactory.

[0007] The present invention has been made in view of such a point, without using a conventional evaporative humidifier.
It is an object of the present invention to provide a novel desiccant air conditioning system capable of performing desiccant air conditioning and to solve the above-mentioned problem.

[0008]

According to a first aspect of the present invention, there is provided a desiccant air conditioning system according to the first aspect, wherein the processing air is dehumidified by a dehumidifying device having a rotatable dehumidifying rotor, and then dehumidified by a sensible heat exchanger. Cooled by heat exchange,
A desiccant air conditioning system that humidifies the cooled air and supplies the humidified air to the target space, wherein the air passage area located on the end face side of the dehumidifying rotor is reduced in the rotation direction of the dehumidifying rotor. After being partitioned into a wet area, a cooling area, and a regeneration area, outside air is used as the processing air, and the outside air is introduced into the dehumidification section and dehumidified, the target space is formed in the sensible heat exchanger. The air that has been heat-exchanged with the return air from the above, the heat-exchanged and cooled air is supplied to the target space after being introduced into the cooling area and humidified and cooled, and is subjected to heat exchange in the sensible heat exchanger. The heated air is heated by a heating device and then introduced into the regeneration section.

In this case, as described in claim 2, the return air from the target space is used as the processing air, and after the dehumidification is performed in the dehumidification zone, heat is exchanged with the outside air in the sensible heat exchanger. , An indoor air circulation type system can be constructed.

According to a third aspect of the present invention, after the outside air is used as the processing air and dehumidified in the dehumidification area, another outside air (external air obtained from the same outside air source as the outside air is used in the sensible heat exchanger). If the heat exchange is performed, an all-outside air type system can be constructed.

Further, as described in claim 4, a mixed air of the outside air and the return air from the target space is used as the processing air, and after the dehumidification in the dehumidification zone, another outside air ( If heat is exchanged with the outside air obtained from the same outside air source as the outside air) or as described in claim 5, heat is exchanged with another return air in the sensible heat exchanger. You can use it efficiently.

According to the desiccant air-conditioning system of the above-mentioned claims, the processing air is first dehumidified in the dehumidification zone of the dehumidification rotor. The dehumidified air is heat-exchanged with the sensible heat exchanger with return air (claims 1 and 5), outside air (claim 2), and other outside air (claims 3 and 4) from the target space. Is performed, cooled, and cooled. Next, the dehumidification rotor is used for cooling the cooled air in the cooling zone.At this time, the dehumidification rotor absorbs moisture by the dehumidification, and the moisture is released into the air in the cooling zone. As a result, it is humidified and cooled. On the other hand, the dehumidifying rotor is flushed by the cooled enthalpy and consequently regenerated a little. Then, the dehumidified rotor that has been regenerated a little is regenerated by removing moisture from the regenerated air. The regenerated air uses heat-exchanged air that has undergone heat exchange with the dehumidified treated air in the sensible heat exchanger, and the heated air is heated by a heating device, so that regenerated air at a temperature suitable for regeneration is obtained. be able to.

According to a sixth aspect of the present invention, the air passage area located on the end face side of the dehumidification rotor is divided into four parts, and the dehumidification area, the cooling area, the pre-regeneration area, And a portion of the air heated after heat exchange in the sensible heat exchanger is directly introduced into the pre-regeneration region of the dehumidification rotor in the dehumidification device, and the remaining part is separated. Heating by the heating device and introducing it into the regeneration area of the dehumidification rotor in the dehumidification device makes it possible to reduce an excessive amount of regeneration air and minimize the energy required for the heating device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a desiccant air conditioning system according to a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a system of the desiccant air conditioning system according to the first embodiment.

The air conditioning system according to the present embodiment is constructed by an all-outside air system, and outside air OA as processing air taken in by an air supply fan 1 is introduced into a dehumidification area 2 a of a dehumidification device 2. It is supposed to be. As shown in FIG. 2, the dehumidifying device 2 includes chambers 4 and 5 on both end sides of a dehumidifying rotor 3 rotated by an appropriate driving source (not shown). 5 is divided into three by a partition plate or the like. As a result, the passage areas of the air located on both end surfaces of the dehumidifying rotor 3 are arranged in the order of the rotation direction of the dehumidifying rotor 3 in the dehumidifying section 2a,
A cooling zone 2b and a regeneration zone 2c are formed. The dehumidifying rotor 3 itself is used in a conventional dry dehumidifying device.
For example, a rotor filled with silica gel or a rotor impregnated with a moisture absorbent such as lithium chloride can be used.
The corresponding ducts 6 and 7 are connected to the chambers 4 and 5 for each of the dehumidifying section 2a, the cooling section 2b, and the regeneration section 2c.

The air dehumidified by passing through the dehumidifying section 2a is then supplied to the target space R by the rotary sensible heat exchanger 11.
After being exchanged with the return air RA from the air, the air is introduced into the cooling section 2b of the dehumidification device 2. The cooling area 2b
In, the moisture absorbed in the dehumidifying section 2a is released into the air passing through the cooling section 2b, and humidifying cooling is performed. The cooled air that has passed through the cooling section 2b is supplied to the chamber R as an air supply SA.

The return air RA from the chamber R is supplied to the sensible heat exchanger 1
In FIG. 1, heat is exchanged with the dehumidified air passing through the dehumidification section 2a. After the air heated by the heat exchange is heated by a regeneration heater 12 as a heating device, the air is supplied to the regeneration section 2b of the dehumidification device 2 and is subjected to regeneration of the dehumidification rotor 3, and then exhausted. The air is exhausted as exhaust EA by the fan 13 to the outside.

The main part of the desiccant air-conditioning system according to the first embodiment is configured as described above, and the state of the temperature change of the air when the desiccant air-conditioning system is operated is shown on an air line diagram. The representation is shown in FIGS. 3 and 4.
In FIG. 1, the corresponding positions of the air on the system at that time are indicated by the same reference numerals.

FIG. 3 shows the case where the temperature of the outside air OA is 32 ° C. and the absolute humidity is 20 g / kg ′, and FIG. 4 shows the case where the temperature of the outside air OA is 32 ° C. and the absolute humidity is 12 g / kg ′. Each is shown. First, the outside air OA (a) immediately after the introduction is dehumidified in the dehumidification section 2a of the dehumidification device, and the humidity is reduced (b). Then, when heat is exchanged in the sensible heat exchanger 11, the temperature is reduced (c). Then, when the humidification and cooling is performed in the cooling section 2b of the dehumidification device 2, the humidity rises but the temperature further decreases (d), and is supplied to the room R as air supply SA.

As for the return air RA from the chamber R (e), the temperature rises because the sensible heat exchanger 11 exchanges heat with the air serving as the supply air SA (f). Next, the temperature is further increased (g) because the heater is heated by the regeneration heater 12, and then sent to the regeneration section 2 b of the dehumidification device 2, where it is subjected to regeneration of the dehumidification rotor 3. Therefore, the temperature is reduced and the humidity is increased (h) by the amount provided for the regeneration, and finally exhausted by the exhaust fan 13 to the outside of the system as exhaust EA.

As described above, according to the desiccant air-conditioning system according to the first embodiment, desiccant air-conditioning can be performed without using a vaporizing humidifier as in the related art. Therefore, there is no problem of water quality management and maintenance of the humidifier itself.

Next, the COP (coefficient of performance) will be considered. Based on the pneumatic diagrams (FIGS. 9 and 10) showing the state of air when the conventional system shown in FIG. 8 is operated,
When the COP is calculated, first, when the outside air condition shown in FIG. 9 is a temperature of 32 ° C. and a relative humidity of 65%, the following is obtained.
The thickness of the dehumidifying rotor is 200 mm, the surface speed is 2 m / s, and all calculations are performed, and it is assumed that the processing and regeneration air volumes are the same. COP = ｛(32-19.5) + (20-12.5) ×
2.49 ° / (83-52) = 1.01

The outside air condition shown in FIG.
In the case of ° C and a relative humidity of 41%, it becomes as follows. COP = ｛(32-16) + (12-9.5) × 2.4
9｝ / (83-56) = 0.82

Next, FIGS. 3 and 4 show the first embodiment.
When the outside air condition shown in FIG.
When the temperature is 2 ° C. and the relative humidity is 65%, the result is as follows. COP = ｛(32-22) + (20-11.5) × 2.
49 ° / (83−64) = 1.64

The outside air condition shown in FIG.
When the relative humidity is 41%, the result is as follows. COP = {(32-22) + (12-7) × 2.49}
/(83-53)=0.75

Therefore, a temperature of 32 ° C. and a relative humidity of 41%
Although the temperature drops slightly in case of, the temperature is 32 ° C and the relative humidity is 6
In the case of 5%, the COP is greatly improved, and particularly when the humidity of the outside air is high, the COP is improved as compared with the conventional case.

Next, a second embodiment will be described.
In the following embodiments, members, devices, and the like denoted by the same reference numerals as those in the first embodiment indicate the same units, devices, and the like as those in the first embodiment. The desiccant air-conditioning system shown in the second embodiment shown in FIG. 5 is constructed by a circulation system, and the return air RA as the processing air taken in by the air supply fan 1.
After being introduced into the dehumidifying section 2a of the dehumidifying apparatus 2, the heat is exchanged with the outside air OA by the sensible heat exchanger 11, and then introduced into the cooling section 2b of the dehumidifying apparatus 2 to be humidified and cooled. It has become. On the other hand, in the sensible heat exchanger 11, the air that has passed through the dehumidifying section 2 a and exchanged heat with the dehumidified air is heated by the regeneration heater 12, and then is heated by the regeneration heater 12. After being supplied to the second dehumidification rotor 2b and subjected to regeneration of the dehumidifying rotor 3, the exhaust fan 13 discharges the exhausted air to the outside as exhaust EA.

According to the desiccant air-conditioning system according to the second embodiment, similar to the first embodiment,
The desiccant air conditioning method can be performed without using a vaporizing humidifier. Moreover, desiccant air conditioning can be performed by an air circulation system.

Next, a third embodiment will be described.
FIG. 6 shows a system of a desiccant air conditioning system according to the third embodiment, and this system is configured as an all-outside air system. That is, after the outside air OA as the processing air is introduced into the dehumidifying section 2a of the dehumidifying device 2, the heat is exchanged with another outside air OA by the sensible heat exchanger 11, and then introduced into the cooling section 2b of the dehumidifying device 2. Then, it is humidified and cooled. On the other hand, in the sensible heat exchanger 11, the air that has passed through the dehumidifying section 2 a and exchanged heat with the dehumidified air is heated by the regeneration heater 12, and then is heated by the regeneration heater 12. After being supplied to the second dehumidification rotor 2b and subjected to regeneration of the dehumidifying rotor 3, the exhaust fan 13 discharges the exhausted air to the outside as exhaust EA.

According to the desiccant air-conditioning system according to the third embodiment, similar to the first embodiment,
The desiccant air conditioning method can be performed without using a vaporizing humidifier. And desiccant air-conditioning can be performed by the whole outside air system.

Next, a fourth embodiment will be described.
As shown in FIG. 7, the desiccant air-conditioning system according to the fourth embodiment is a four-part type dehumidifier instead of the three-part type dehumidifier 2 used in the first embodiment. 21 is used. That is, in the four-part type dehumidifying device 21, the air passage area of the end face of the dehumidifying rotor (not shown) has the order of rotation of the dehumidified air 21a, the cooling zone 21b, the pre-regeneration zone 21c, and the regeneration zone 21d. It is divided into four.

A part of the air heated by the heat exchange with the dehumidified air by the sensible heat exchanger 11 is directly introduced into the pre-regeneration section 21c, and the remaining part is heated by the regeneration heater 12. After that, it is introduced into the reproduction area 21d. These pre-reproduction areas 21
c, after the air that has passed through the regeneration area 21d is mixed,
The air is exhausted outside the system as exhaust EA by the exhaust fan 13.

According to the desiccant air-conditioning system according to the fourth embodiment, the ratio between the pre-regeneration air and the so-called main regeneration air heated by the regeneration heater 12 is adjusted in accordance with conditions and the like. By changing, it is possible to realize an optimum amount of regeneration heat according to the system. That is, the amount of regeneration heat can be suppressed to a necessary minimum, and energy can be saved more than in the desiccant air-conditioning system according to the first embodiment.

As described above, a part of the air exiting from the sensible heat exchanger 11 is heated by the regeneration heater
To supply the remaining part to the pre-regeneration section 21c as it is, for example, the flow path from the sensible heat exchanger 11 to the dehumidifier 21 is divided into two, and the regeneration heater 12 is disposed on one of the two. What should I do?

In the above-described embodiment, the outside air OA or the return air RA is used as the processing air. However, if the mixed air of the outside air OA and the return air RA is used as the processing air instead, the return air may be used. Efficient use of RA can be achieved.

[0036]

According to the desiccant air-conditioning system of the first to sixth aspects, the desiccant air-conditioning method can be carried out without using a vaporizing humidifier as in the prior art. The problem of maintenance of itself does not occur. Further, in the case of claim 6, the energy required for heating the air used for regeneration can be suppressed to a necessary minimum.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram schematically showing a configuration of a desiccant desiccant air-conditioning system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a dehumidifying device used in the desiccant air conditioning system of FIG.

FIG. 3 is an air line diagram showing a state of air when the first embodiment is carried out when the outside air condition is 32 ° C. and 20 g / kg ′.

FIG. 4 is an air line diagram showing a state of air when the first embodiment is carried out when the outside air condition is 32 ° C. and 12 g / kg ′.

FIG. 5 is an explanatory view schematically showing a configuration of a desiccant desiccant air-conditioning system according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an outline of a configuration of a desiccant desiccant air-conditioning system according to a third embodiment of the present invention.

FIG. 7 is an explanatory view schematically showing a configuration of a desiccant desiccant air-conditioning system according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory view schematically showing a configuration of a desiccant air-conditioning system according to a conventional technique.

FIG. 9 is an air line diagram showing the state of air when the conventional technique of FIG. 8 is operated when the outside air condition is 32 ° C. and 20 g / kg ′.

10 is an air line diagram showing the state of air when the conventional technique of FIG. 8 is operated when the outside air condition is 32 ° C. and 12 g / kg ′.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air supply fan 2 Dehumidifier 3 Dehumidification rotor 2a Dehumidification area 2b Cooling area 2c Regeneration area 11 Sensible heat exchanger 12 Regeneration heater 13 Exhaust fan R room OA Outside air SA Air supply RA Return air EA Exhaust

Claims (6)

[Claims] 1. A dehumidifier having a rotatable dehumidifying rotor dehumidifies processing air, cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air to form the target space. A desiccant type air conditioning system that supplies air to the dehumidifying rotor, wherein the passage area of the air located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regenerating area in the rotation direction of the dehumidifying rotor. Outside air is used as the processing air, and after the outside air is introduced into the dehumidification area and dehumidified, heat is exchanged with return air from the target space in the sensible heat exchanger, and the heat exchange is performed. The cooled air is introduced into the cooling area, humidified and cooled, and supplied to the target space.The heated air that has been subjected to heat exchange in the sensible heat exchanger is heated by a heating device. Was done And a desiccant air conditioning system configured to be introduced into the regeneration area. 2. A dehumidifying device having a rotatable dehumidifying rotor dehumidifies processing air, cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air to form the target space. A desiccant type air conditioning system that supplies air to the dehumidifying rotor, wherein the passage area of the air located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regenerating area in the rotation direction of the dehumidifying rotor. The return air from the target space is used as the process air, and after the return air is introduced into the dehumidification area and dehumidified, heat is exchanged with outside air in the sensible heat exchanger, and the heat exchange is performed. The cooled air is introduced into the cooling area, humidified and cooled, and supplied to the target space.The heated air that has been subjected to heat exchange in the sensible heat exchanger is heated by a heating device. After that, A desiccant air-conditioning system configured to be introduced into the regeneration area. 3. The process space is dehumidified by a dehumidifier having a rotatable dehumidifier rotor, and then cooled by exchanging heat with a sensible heat exchanger, and then the cooled air is humidified to form the target space. A desiccant type air conditioning system that supplies air to the dehumidifying rotor, wherein the passage area of the air located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regenerating area in the rotation direction of the dehumidifying rotor. Outside air is used as the processing air, and after the outside air is introduced into the dehumidification area and dehumidified, heat is exchanged with another outside air in the sensible heat exchanger, and the heat is exchanged and the temperature is lowered. The heated air is supplied to the destination space after being introduced into the cooling area and humidified and cooled, and the heated air after heat exchange in the sensible heat exchanger is heated by a heating device, The regeneration zone A desiccant air conditioning system characterized by being configured to be introduced into a region. 4. After dehumidifying the treated air by a dehumidifying device having a rotatable dehumidifying rotor, the treated air is cooled by exchanging heat with a sensible heat exchanger, and then the cooled air is humidified to form the target space. A desiccant type air conditioning system that supplies air to the dehumidifying rotor, wherein the passage area of the air located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regenerating area in the rotation direction of the dehumidifying rotor. A mixed air of outside air and return air from the target space is used as the processing air, and the mixed air is introduced into the dehumidification area and dehumidified. Heat-exchanged with the outside air, the heat-exchanged and cooled air is:
After being introduced into the cooling zone and humidified and cooled, the air is supplied to the target space, and the heated air that has been heat-exchanged in the sensible heat exchanger is heated by a heating device, and then is transferred to the regeneration zone. A desiccant air conditioning system characterized by being configured to be introduced. 5. After dehumidifying the treated air by a dehumidifier having a rotatable dehumidifying rotor, the treated air is cooled by exchanging heat with a sensible heat exchanger, and then the cooled air is humidified to form the target space. A desiccant type air conditioning system that supplies air to the dehumidifying rotor, wherein the passage area of the air located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regenerating area in the rotation direction of the dehumidifying rotor. A mixed air of outside air and return air from the target space is used as the processing air, and the mixed air is introduced into the dehumidification area and dehumidified, and then the target air is passed through the sensible heat exchanger. The heat exchanged with other return air from the space, the heat-exchanged and cooled air is supplied to the target space after being introduced into the cooling area and humidified and cooled, and the heat exchange is performed in the sensible heat exchanger. After The desiccant air conditioning system, wherein the heated air is heated by a heating device and then introduced into the regeneration area. 6. The air passage area located on the end face side of the dehumidification rotor is partitioned into a dehumidification area, a cooling area, a pre-regeneration area, and a regeneration area in the rotation direction of the dehumidification rotor. A part of the heated air after the heat exchange in the sensible heat exchanger is introduced into the pre-regeneration section, and the remaining part is introduced into the regeneration section after being heated by a heating device. The desiccant air conditioning system according to claim 1, wherein the desiccant air conditioning system is configured to be configured as follows.