JP4283361B2 - Desiccant air conditioning method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a desiccant air conditioning method capable of supplying low-temperature air without using a vaporizing humidifier.
[0002]
[Prior art]
The desiccant type air conditioning method is an air conditioning method in which air is dehumidified with a desiccant, cooled with a heat exchanger, and then humidified to obtain low-temperature air. Since it does not use chlorofluorocarbon, it is a preferable air conditioning method for the global environment. Conventionally, for example, Japanese Patent Laid-Open No. 5-115737 “Deodorization and Dehumidification Cooling Method Using Adsorbent with Deodorization and Dehumidification Function”, Japanese Patent Laid-Open No. Japanese Patent Application Laid-Open No. 9-178289 “Desicant Air Conditioner”, Japanese Patent Application Laid-Open No. 9-178290 “Desicant Air Conditioner”, and Japanese Patent Application Laid-Open No. 9-178291 “Desicant Air Conditioner”.
[0003]
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 in the whole outside air system, and the outside air OA taken in by the air supply fan 101 is dehumidified by the dehumidifying rotor 102 and then returned by the sensible heat exchanger 103. After the heat exchange with RA, it is introduced into the vaporizing humidifier 104. And after evaporative cooling in the humidifier 104, it is supplied to the chamber R as the supply air SA.
[0004]
The return air RA from the chamber R is evaporated and cooled in the vaporizing humidifier 105 and the temperature is lowered, and then the heat is exchanged in the sensible heat exchanger 103, and then the temperature is raised by the regenerative heater. It is introduced into the dehumidifying rotor 102 and is exhausted to the outside as exhaust EA by the exhaust fan 107.
[0005]
The state diagram of air in the conventional system is shown in FIGS. In this system, the capacity and efficiency change depending on the outside air condition, so two outside air conditions were examined. FIG. 9 shows the case where the outside air condition is 32 ° C. and the relative humidity is 65% (absolute humidity 20 g / kg ′). FIG. 10 shows the outside air condition is 32 ° C. and the relative humidity 41% (absolute humidity 12 g / kg ′). This is the case. 9 and 10 indicate air states at the same reference numerals in the system shown in FIG.
[0006]
[Problems to be solved by the invention]
However, since the conventional system uses a vaporizing humidifier, there is a problem that water management is troublesome. That is, for example, when intermittent operation is performed, bacteria may be generated in the moisture on the surface of the humidifier, and a bad 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]
This invention is made | formed in view of this point, and provides the new desiccant air-conditioning method which can implement desiccant air-conditioning, without using the conventional vaporization type humidifier, and aims at solution of the said problem. Is the purpose.
[0008]
[Means for Solving the Problems]
In order to achieve the object, the desiccant air-conditioning method according to claim 1, after dehumidifying the processing air with a dehumidifying device having a rotatable dehumidifying rotor, cools the sensible heat exchanger and then cools it. A desiccant air conditioning method for humidifying the cooled air and supplying the air to the target space, wherein the air passing area located on the end face side of the dehumidifying rotor is dehumidified in the order of rotation of the dehumidifying rotor. zone is partitioned into a cooling zone and regeneration zone, use the outside air as the process air, after the outside air was dehumidified is introduced into the reduced-humidity zone, from the object space in the sensible heat exchanger the return air and heat exchange, the air temperature was lowered is the heat exchanger, the introduced cooling zone the supplies to the object space after fogging, the temperature after being heat-exchanged in the sensible heat exchanger warm air, heated instrumentation After heating by, it is characterized by the introduction into said regeneration zone.
[0009]
In this case, as described in claim 2, if the return air from the target space is used as the processing air and the moisture is dehumidified in the dehumidifying area and then heat exchange with the outside air is performed in the sensible heat exchanger, A circulation type method can be realized .
[0010]
Further, as described in claim 3, after using the outside air as the processing air and dehumidifying in the dehumidifying area, other outside air (may be outside air obtained from the same outside air source as the outside air) in the sensible heat exchanger. By exchanging heat with the outside air type method can be realized .
[0011]
Further, as described in claim 4, after using the mixed air of the outside air and the return air from the target space as the processing air and dehumidifying in the dehumidifying area, the outside air (with the outside air and the outside air in the sensible heat exchanger) If it is configured to exchange heat with other return air in the sensible heat exchanger as described in claim 5, the efficiency of the return air may be Can be used for good.
[0012]
According to the desiccant air conditioning method of each of the above claims, the processing air is first dehumidified in the dehumidifying area of the dehumidifying rotor. The dehumidified air is exchanged with the sensible heat exchanger for return air from the target space (Claims 1 and 5), outside air (Claim 2), and other outside air (Claims 3 and 4). Is performed and cooled to lower the temperature. The dehumidifying rotor is then used to cool the cooled air in the cooling zone, where the dehumidifying 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 dehumidified rotor is regenerated a little as a result of the water being removed by the cooled enthalpy. The dehumidified rotor that has been slightly regenerated is regenerated by removing moisture from the regenerated air. As the regeneration air, air heated by the heat exchange with the dehumidified processing air in the sensible heat exchanger is used, and the heated air is heated by a heating device, so that regeneration air having a temperature suitable for regeneration is obtained. be able to.
[0013]
Further, as in claim 6, the air passing area located on the end face side of the dehumidifying rotor is divided into four parts, and the dehumidifying area, cooling area, pre-regenerating area, and regenerating area are arranged in the order of rotation of the dehumidifying rotor. And a part of the heated air after heat exchange in the sensible heat exchanger is introduced as it is into the pre-regeneration area of the dehumidifying rotor in the dehumidifying device, and the remaining part is heated by the heating device. If it is heated and introduced into the regeneration area of the dehumidifying rotor in the dehumidifying device, the excessive regeneration air volume can be reduced and the energy required for the heating device can be kept to the minimum necessary.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a desiccant air conditioning method according to a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a system system for carrying out the desiccant air-conditioning method according to the first embodiment .
[0015]
In this air conditioning system, the system is constructed by an all-outside air system, and the outside air OA as processing air taken in by the air supply fan 1 is introduced into the dehumidifying area 2 a of the dehumidifying device 2. . As shown in FIG. 2, the dehumidifying device 2 includes chambers 4 and 5 on both end surfaces of a dehumidifying rotor 3 that is rotated by an appropriate drive source (not shown). The interior of 5 is divided into three parts by a partition plate or the like. As a result, a dehumidifying zone 2 a, a cooling zone 2 b, and a regeneration zone 2 c are formed in the air passing area located on both end surfaces of the dehumidifying rotor 3 in the order of rotation of the dehumidifying rotor 3. As the dehumidifying rotor 3 itself, for example, a rotor filled with silica gel or a rotor impregnated with a hygroscopic agent such as lithium chloride, which is used in a conventional dry dehumidifying apparatus, can be used. Corresponding ducts 6 and 7 are connected to each of the chambers 4 and 5 for each dehumidifying zone 2a, cooling zone 2b, and regeneration zone 2c.
[0016]
The air that has been dehumidified after passing through the dehumidifying zone 2a is then heat-exchanged with the return air RA from the target space R by the rotary sensible heat exchanger 11, and then introduced into the cooling zone 2b of the dehumidifying device 2. It has come to be. In the cooling zone 2b, moisture absorbed in the dehumidifying zone 2a is released into the air passing through the cooling zone 2b, and humidification cooling is performed. The cooled air that has passed through the cooling zone 2b is supplied to the chamber R as the supply air SA.
[0017]
In the sensible heat exchanger 11, the return air RA from the chamber R passes through the dehumidifying zone 2a and exchanges heat with the dehumidified air. The air heated by the heat exchange is then heated by a regenerative heater 12 as a heating device, then supplied to the regeneration zone 2b of the dehumidifying device 2, supplied to the regeneration of the dehumidifying rotor 3, and then exhausted. The fan 13 exhausts the air as exhaust EA.
[0018]
The system for carrying out the desiccant air-conditioning method according to the first embodiment is configured as described above, and when the desiccant air-conditioning method according to the present embodiment is implemented using this system. FIG. 3 and FIG. 4 show the state of the temperature change of the air on the air diagram. In FIG. 1, the corresponding positions of the air on the system are indicated by the same reference numerals.
[0019]
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 ′. Yes. First, the outside air OA (a) immediately after introduction is dehumidified in the dehumidifying area 2a of the dehumidifying device and the humidity is lowered (b), and then the temperature is lowered when heat is exchanged in the sensible heat exchanger 11 (c Then, when humidified and cooled in the cooling zone 2b of the dehumidifying device 2, the humidity increases, but the temperature further decreases (d) and is supplied to the room R as the supply air SA.
[0020]
As for the return air RA from the chamber R (e), heat is exchanged with the air serving as the supply air SA in the sensible heat exchanger 11, so that the temperature rises (f). Next, since it is heated by the regenerative heater 12, the temperature further rises (g), and is then sent to the regeneration zone 2b of the dehumidifying device 2 to be used for regenerating the dehumidifying rotor 3. Therefore, the temperature is reduced and the humidity is increased (h) for the regeneration, and finally exhausted by the exhaust fan 13 as exhaust EA to the outside of the system.
[0021]
As described above, according to the desiccant air conditioning method according to the first embodiment, desiccant air conditioning can be performed without using a vaporizing humidifier as in the prior art. Therefore, the problem of water quality management and maintenance of the humidifier itself does not occur.
[0022]
Next, COP (coefficient of performance) will be considered. When the COP is calculated based on the air diagram (FIGS. 9 and 10) showing the state of air when the conventional system shown in FIG. 8 is operated, first, the outside air condition shown in FIG. When the temperature is 65 ° C. and the relative humidity is 65%, it is as follows. It is assumed that the thickness of the dehumidifying rotor is 200 mm, the surface speed is 2 m / s, and that the air volume for processing and regeneration is the same.
COP =
{(32-19.5) + (20-12.5) × 2.49} / (83-52)
= 1.01
[0023]
Further, when the outside air condition shown in FIG. 10 is a temperature of 32 ° C. and a relative humidity of 41%, it is as follows.
COP =
{(32-16) + (12-9.5) × 2.49} / (83-56)
= 0.82
[0024]
Next, when the first embodiment is calculated based on FIG. 3 and FIG. 4, when the outside air condition shown in FIG. 3 is a temperature of 32 ° C. and a relative humidity of 65%, it is as follows.
COP =
{(32-22) + (20-11.5) × 2.49} / (83-64)
= 1.64
[0025]
Further, when the outside air condition shown in FIG. 4 is a temperature of 32 ° C. and a relative humidity of 41%, the following occurs.
COP =
{(32-22) + (12-7) × 2.49} / (83-53)
= 0.75
[0026]
Therefore, although the temperature drops slightly when the temperature is 32 ° C. and the relative humidity is 41%, the COP is greatly improved when the temperature is 32 ° C. and the relative humidity is 65%. COP is also improved.
[0027]
Next, a second embodiment will be described. In each of the following embodiments, members, devices, and the like that are denoted by the same reference numerals as those in the first embodiment indicate the same parts, devices, and the like as the system used in the first embodiment. The air conditioning system for carrying out the second embodiment shown in FIG. 5 is constructed in a circulating manner, and the return air RA as processing air taken in by the air supply fan 1 is a dehumidifier. After being introduced into the second dehumidifying zone 2a, the sensible heat exchanger 11 exchanges heat with the outside air OA, and then is introduced into the cooling zone 2b of the dehumidifying device 2 to be humidified and cooled. On the other hand, in the sensible heat exchanger 11, the air that has passed through the dehumidification zone 2 a and has been heated by heat exchange with the dehumidified air is heated by the regeneration heater 12, and then the regeneration zone of the dehumidifier 2. After being supplied to 2b and used for the regeneration of the dehumidifying rotor 3, it is exhausted to the outside as exhaust EA by the exhaust fan 13.
[0028]
According to the desiccant air-conditioning method according to the second embodiment, the desiccant air-conditioning method can be implemented without using a vaporizing humidifier, as in the first embodiment. In addition, the desiccant air conditioning can be carried out by the air circulation method.
[0029]
Next, a third embodiment will be described. FIG. 6 shows a system of an air conditioning system for carrying out 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 area 2a of the dehumidifying device 2, the heat exchange with the other outside air OA is performed by the sensible heat exchanger 11, and then introduced into the cooling area 2b of the dehumidifying device 2. It is designed to be humidified and cooled. On the other hand, in the sensible heat exchanger 11, the air that has passed through the dehumidification zone 2 a and has been heated by heat exchange with the dehumidified air is heated by the regeneration heater 12, and then the regeneration zone of the dehumidifier 2. After being supplied to 2b and used for the regeneration of the dehumidifying rotor 3, it is exhausted to the outside as exhaust EA by the exhaust fan 13.
[0030]
According to the desiccant air-conditioning method according to the third embodiment, the desiccant air-conditioning method can be implemented without using a vaporizing humidifier, as in the first embodiment. And desiccant air-conditioning can be implemented by the whole outside air system.
[0031]
Next, a fourth embodiment will be described. As shown in FIG. 7, the air conditioning system for carrying out the fourth embodiment is replaced with a four-split type dehumidifier 2 instead of the three-split type dehumidifier 2 used in the first embodiment. A wet device 21 is used. That is, in the four-part type dehumidifying device 21, the air passage area at the end face of the dehumidifying rotor (not shown) has the dehumidifying air 21a, cooling area 21b, pre-regenerating area 21c, and regenerating area 21d in the order of rotation of the rotor. It is divided into four.
[0032]
And, after the air heated by the heat exchange with the air after dehumidification by the sensible heat exchanger 11 is partially introduced into the pre-regeneration area 21c as it is and the remaining part is heated by the regeneration heater 12, It is introduced into the regeneration zone 21d. The air that has passed through the pre-regeneration area 21c and the regeneration area 21d is mixed and then exhausted out of the system by the exhaust fan 13 as exhaust EA.
[0033]
According to the desiccant air-conditioning method according to the fourth embodiment, the ratio of the pre-regeneration air and the temperature of the main regeneration air heated by the regeneration heater 12 is changed according to the conditions, etc. It is possible to realize the optimum amount of heat for regeneration according to the conditions. That is, the amount of regenerated heat can be minimized, and energy saving can be achieved as compared with the desiccant air conditioning method according to the first embodiment.
[0034]
In order to supply a part of the air that has exited the sensible heat exchanger 11 with the regeneration heater 12 and then supply the remaining part to the regeneration zone 21d and the remaining part to the pre-regeneration zone 21c, for example, The flow path from the heat exchanger 11 to the dehumidifying device 21 may be divided into two, and the regenerative heater 12 may be arranged on one of them.
[0035]
In the above embodiment, the outside air OA or the return air RA is used as the processing air, but if the mixed air of the outside air OA and the return air RA is used as the processing air instead, the efficiency of the return air RA is increased. Can be used in good condition.
[0036]
【The invention's effect】
According to the desiccant air-conditioning method of claims 1 to 6, since the desiccant-type air-conditioning method can be carried out without using a vaporizing humidifier as in the prior art, there is a problem of water quality management and maintenance of the humidifier itself. Does not occur. Furthermore, in the case of claim 6, the energy required for heating the air used for regeneration can be minimized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of the configuration of a system for carrying out a desiccant air conditioning method according to a first embodiment of the invention.
FIG. 2 is a perspective view of a dehumidifying device used in the system of FIG.
FIG. 3 is an air diagram showing the 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 diagram showing the state of air when the first embodiment is performed when the outside air condition is 32 ° C. and 12 g / kg ′.
FIG. 5 is an explanatory diagram showing an outline of a configuration of a system for carrying out a desiccant air-conditioning method according to a second embodiment of the present invention.
FIG. 6 is an explanatory diagram showing an outline of a system configuration for carrying out a desiccant air-conditioning method according to a third embodiment of the present invention.
FIG. 7 is an explanatory diagram showing an outline of the configuration of a system for carrying out a desiccant air conditioning method according to a fourth embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an outline of a configuration of a desiccant air conditioning system according to a conventional technique.
FIG. 9 is an air diagram showing the state of air when the prior art of FIG. 8 is operated when the outside air condition is 32 ° C. and 20 g / kg ′.
FIG. 10 is an air diagram showing the state of air when the prior art of FIG. 8 is operated when the outside air condition is 32 ° C. and 12 g / kg ′.
[Explanation 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)

A desiccant system that dehumidifies the processing air with a dehumidifying device having a rotatable dehumidifying rotor, then cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air and supplies it to the target space. Air conditioning method ,
The air passage area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regeneration area in the order of rotation of the dehumidifying rotor,
Using the outside air as the process air,
After the outside air has been dehumidified is introduced into the reduced-humidity zone, wherein the sensible heat exchanger and the return air and the heat exchange from the target space, the air temperature was lowered is the heat exchanger, introduced into the cooling zone above it is supplied to the object space after fogging, after the heating air after being heat-exchanged in the sensible heat exchanger and heated by the heating device, characterized in that introduced into the regeneration zone And desiccant air conditioning method . A desiccant system that dehumidifies the processing air with a dehumidifying device having a rotatable dehumidifying rotor, then cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air and supplies it to the target space. Air conditioning method ,
The air passage area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regeneration area in the order of rotation of the dehumidifying rotor,
Using the return air from the target space as the process air,
After the return air was dehumidified is introduced into the reduced-humidity zone, wherein the sensible heat exchanger and outdoor air heat exchange from the target space, the air temperature was lowered is the heat exchanger, introduced into the cooling zone above it is supplied to the object space after fogging, after the heating air after being heat-exchanged in the sensible heat exchanger and heated by the heating device, characterized in that introduced into the regeneration zone And desiccant air conditioning method . A desiccant system that dehumidifies the processing air with a dehumidifying device having a rotatable dehumidifying rotor, then cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air and supplies it to the target space. Air conditioning method ,
The air passage area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regeneration area in the order of rotation of the dehumidifying rotor,
Using the outside air as the process air,
After the outside air has been dehumidified is introduced into the reduced-humidity zone, wherein the sensible heat exchanger other outdoor air heat exchanger, the air temperature was lowered is the heat exchanger, is introduced into the cooling zone humidified the supply to the object space after cooling, after the heating air after being heat-exchanged in the sensible heat exchanger and heated by the heating apparatus, and characterized that you introduced into the regeneration zone A desiccant air conditioning method . A desiccant system that dehumidifies the processing air with a dehumidifying device having a rotatable dehumidifying rotor, then cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air and supplies it to the target space. Air conditioning method ,
The air passage area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regeneration area in the order of rotation of the dehumidifying rotor,
Using the mixed air with return air from the outside air objective space as the process air,
After the mixed air was dehumidified is introduced into the reduced-humidity zone, wherein the sensible heat exchanger and replace other heat with outside air, the air temperature was lowered is the heat exchanger, is introduced into the cooling zone the supply to the object space after fogging, after the heating air after being heat-exchanged in the sensible heat exchanger and heated by the heating apparatus, and wherein the introduction into the regeneration zone A desiccant air conditioning method. A desiccant system that dehumidifies the processing air with a dehumidifying device having a rotatable dehumidifying rotor, then cools it by exchanging heat with a sensible heat exchanger, and then humidifies the cooled air and supplies it to the target space. Air conditioning method ,
The air passage area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, and a regeneration area in the order of rotation of the dehumidifying rotor,
Using the mixed air with return air from the outside air objective space as the process air,
After the mixed air was dehumidified is introduced into the reduced-humidity zone, the and other return air and heat exchange from the target space in the sensible heat exchanger, the air temperature was lowered is the heat exchanger, the was introduced into the cooling zone the supplies to the object space after fogging, the warm air after being heat-exchanged in the sensible heat exchanger, heated by the heating apparatus, into the regeneration zone A desiccant air conditioning method , characterized by being introduced. The air passing area located on the end face side of the dehumidifying rotor is partitioned into a dehumidifying area, a cooling area, a pre-regenerating area, and a regenerating area in the order of rotation of the dehumidifying rotor,
Some of the warm air after being heat-exchanged in the sensible heat exchanger, the introduced to the pre-regeneration zone, after heating by the heating device a part of the rest, be introduced into the regeneration zone The desiccant air-conditioning method according to claim 1, 2, 3 or 4.

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