JP2001108309A - Dehumidifying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying system capable of lowering the humidity of supply air sufficiently irrespectively of the condition of air supplied as air to be treated. SOLUTION: A dehumidifying system is provided with a moisture adsorbing device 103, a cooler 210 for cooling air A to be treated, whose moisture is absorbed, a humidity detector 303 for detecting the humidity of air in a space 101, to which the air A to be treated after cooling is supplied, or the humidity of air affecting to the humidity of air in the space 101, a route 113 for returning the air A to be treated after cooling to the moisture adsorbing device 103 while bypassing the air A to be treated after cooling, and regulating means 303, 301 for regulating the amount of air to be treated, which is bypassed base on the detecting result of the moisture detector 303. The cooled air to be treated is returned into the moisture adsorbing device 103 whereby the humidity of the air to be treated can be lowered sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dehumidifier,
In particular, it relates to a dehumidifier using a desiccant.

[0002]

2. Description of the Related Art As shown in FIG. 4, there has conventionally been a desiccant dehumidifying air conditioner using a heat pump as a heat source. In the air conditioner shown in FIG. 4, a compression heat pump HP using a compressor 260 is used as a heat pump. The air conditioner includes a path of the processing air A in which moisture is adsorbed by the desiccant rotor 103, and a desiccant rotor 103 heated by a heating source and adsorbed by the moisture.
Has a path of regenerating air B for desorbing and regenerating moisture in the desiccant by passing through the air, and is heated by the heating source before regenerating the desiccant (desiccant) of the desiccant rotor 103 and the treated air to which the moisture has been adsorbed. An air conditioner having a sensible heat exchanger 104 between the air before regeneration and a compression heat pump HP. In the compression heat pump HP, the regeneration air of the air conditioner is heated using a regeneration air as a high heat source. In addition, the desiccant is regenerated by heating the air in the air conditioner, and the processing air is cooled by the cooler 210 using the processing air as a low heat source of the compression heat pump HP.

Here, the operation of the desiccant air conditioner shown in FIG. 4 will be described with reference to the psychrometric chart of FIG. In FIG. 5, alphabets Q to U and L to N indicate the state of air. This symbol corresponds to the alphabet circled in the flowchart of FIG.

In FIG. 5, outside air (state Q) from the outdoor OA is treated as desiccant rotor 103 to absorb moisture by the desiccant rotor 103 as the processing air, thereby lowering the absolute humidity and raising the dry bulb temperature by the heat of adsorption of the desiccant. In the state L, the air is cooled in the sensible heat exchanger 104 while keeping the absolute humidity constant, and becomes the air in the state M. The air enters the cooler 210. Here, the air is further cooled at a constant absolute humidity to become air in state N, and is returned to the air-conditioned space 101 as supply air SA. On the other hand, the outside air in the state Q is sent to the sensible heat exchanger 104 as regenerated air, where the processing air is heated to be in the state R by cooling the processing air, and is heated in the heater 220 to be in the state T, By regenerating the desiccant by the desiccant rotor 103, the desiccant itself has a high absolute humidity, the dry-bulb temperature decreases, and the state becomes U, and the exhaust gas is exhausted.

[0005]

According to the conventional air conditioner described above, the cooler 210 pumps heat from the processing air, which is a low heat source, and the heater 220 heats the regeneration air, which is a high heat source. . Further, before the processing air is cooled by the cooler 210, it is preliminarily cooled by the sensible heat exchanger 104.
However, the air serving as the processing air may become hot and humid beyond the expected temperature and expected humidity, but in such a case, the desiccant adsorption capacity is exceeded,
The humidity of the supply air SA cannot be reduced sufficiently. As a result, there is a problem that the humidity of the air-conditioned space cannot be maintained at an appropriate value.

Accordingly, an object of the present invention is to provide a dehumidifier capable of sufficiently reducing the humidity of supply air regardless of the condition of air supplied as processing air.

[0007]

In order to achieve the above object, a dehumidifier according to the first aspect of the present invention is, for example, shown in FIG.
, A moisture adsorber 103 having a desiccant that adsorbs moisture in the processing air A;
03 is provided on the downstream side of the flow of the processing air,
A cooler 210 for cooling the processing air A to which the moisture is adsorbed by the desiccant; and a humidity of the air in the space 101 for supplying the processing air A cooled by the cooler 210 or a humidity of the air in the space 101. A humidity detector 303 for detecting the humidity of the air that gives the air; and a bypass path 113 for returning the processing air A cooled by the cooler 210 to the moisture adsorption device 103 by bypassing the space 101; Has means 301 and 302 for adjusting the amount of processing air passing through the bypass path 113 based on the detection result of the humidity detector 303.

The humidity of the air in the space 101 for supplying the processing air after being cooled by the cooler 210 or the air that directly or indirectly affects the humidity of the air in the space 101 is typically Is the air in the space 101, or the space 1
01 is supplied air (directly affects) to the outside air OA supplied to the dehumidification as processing air.
(Indirectly affected). Since the cooled processing air (supply air SA in the example of FIG. 1) is returned to the moisture adsorption device 103 by bypass, the humidity of the processing air from the moisture adsorption device 103 can be sufficiently reduced.

Further, as described in claim 2, claim 1
In the dehumidifier described in the above, the heat pump HP may be provided which uses the regenerated air B for regenerating the desiccant as a high heat source and the treated air A as a low heat source.

Since a heat pump HP is used, a dehumidifier having a high COP can be obtained. When the heat pump HP is used, the temperature of the regenerated air B cannot often be increased so much due to the heat drop, but in such a case, the desiccant dehumidifying ability is relatively low. However, if a bypass is used, low humidity process air is obtained. The cooler may be the evaporator 210 on the low heat source side of the heat pump HP,
Heat exchanger 10 for exchanging heat between regeneration air B and processing air A
It may be four.

According to a third aspect of the present invention, in the dehumidifying apparatus according to the second aspect, it is preferable that the cooler is the evaporator 210 on the low heat source side of the heat pump HP. In this case, since the evaporator 210 on the low heat source side of the heat pump HP is used, the sufficiently cooled processing air is bypassed and returned to the moisture adsorption device, so that the humidity of the processing air can be sufficiently reduced.

[0012] The use of the entire amount of outside air as the air to be supplied to the processing air, and applications in which total heat exchange (exchange of temperature and humidity) is not possible between the air exhausted from the space 101 and the outside air to be supplied to the processing air, such as a hospital ( It is suitable for use in, for example, bacteria (possibly contaminated by bacteria), kitchens (possible of circulating odors), and the like. Humidity detection is typically detection of absolute humidity, and may be dew point detection or wet bulb temperature detection.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding members are denoted by the same or similar reference numerals, and duplicate description is omitted.

FIG. 1 is a flowchart of a dehumidifying air conditioner according to a first embodiment of the present invention, and FIG. 2 is a psychrometric chart of the dehumidifying air conditioner of FIG.

Referring to FIG. 1, the configuration of a dehumidifying air conditioner according to a first embodiment will be described. This air conditioner lowers the humidity of processing air with a desiccant (drying agent) and maintains the air-conditioned space 101 to which processing air is supplied in a comfortable environment. In the figure, a path 107, a blower 102 for blowing the processing air, a path 108, a desiccant rotor 103 filled with desiccant, a heat exchanger 104, a path 110, a cooler (along the path of the processing air A from the outdoor OA) Evaporator from the viewpoint of the refrigerant) 210, path 111, path 1
12 and are arranged in this order, and are configured to be supplied to the air-conditioned space 101.

The route 111 is a route 1 to the air-conditioned space 101.
12 and a bypass path 113 to the path 107. In the bypass path 113, the processing air serving as the supply air SA bypasses the air-conditioned space 101 and flows to the path 107, where it joins with the whole amount of outside air serving as the processing air.

A humidity detector 303 is provided in a path 112, and a control valve (control damper) 3 is provided in a bypass path 113.
02 is installed. Further, receiving a signal from the humidity detector 303 and transmitting a control signal to the control valve 302,
An adjuster 301 for adjusting the opening of the control valve 302 is provided so that the humidity detected by the humidity detector 303 has a predetermined value.

Further, along a path from the outdoor OA to the regeneration air B, a path 124, a blower 140 for blowing the regeneration air,
Path 125, heat exchanger 104 for exchanging heat between regenerated air and processing air after leaving desiccant rotor 103, path 1
26, heater (condenser as seen from refrigerant) 220, path 1
27, the desiccant rotor 103 and the path 128 are arranged in this order, and are configured to exhaust EX to the outside.

A compressor 260 that compresses the refrigerant evaporated and gasified by the cooler (refrigerant evaporator) 210 along a refrigerant path from the cooler 210 and a heater (refrigerant condenser) 22
0, the throttle 250 is arranged in this order, and the heat pump HP is configured so as to return to the cooler (refrigerant evaporator) 210 again.

The operation of the first embodiment will be described with reference to the psychrometric chart of FIG. 2 and the flow chart of FIG. In FIG. 2, the state of air in each part is indicated by alphabetical symbols Q to U and K to N. This symbol corresponds to the alphabet circled in the flowchart of FIG.

First, the flow of the processing air A will be described. In FIG. 2, the total amount of outside air (state Q) from outside, which is air supplied as processing air, is sucked in by the blower 102 through the processing air path 107. At this time, when air in state N, which will be described later, is bypassed through the path 113, the air to be bypassed and the outside air are mixed, and the air in the state K intermediate between the outside air and the cooled processing air is formed. Sucked into. On the psychrometric chart, point K
Is a point that internally divides the line segment QN.
K: KN is the inverse ratio of the weight flow rate of the outside air in the state Q to the weight flow rate of the supply air in the bypassed state N.

The air in the state K is sent to the desiccant rotor 103 through the processing air path 108. Here, moisture is adsorbed by the desiccant in the desiccant rotor 103 and the absolute humidity is reduced, and the dry bulb temperature is increased by the heat of desiccant adsorption to reach the state L.

This air is sent to the heat exchanger 104 through the processing air path 109, where it is cooled by the outside air as regeneration air while the absolute humidity is kept constant, and becomes air in state M.
It enters the cooler 210 through the path 110.

In the cooler 210, the air that has been further cooled to the state N while the absolute humidity is kept constant is supplied to the air-conditioned space 101.
Is supplied to the suction side of the blower 102 through the bypass path 113.

The path of the regenerated air B is the same as in the prior art, and will not be described.

In the air conditioner as described above, the amount of heat added to the regenerated air for regeneration of the desiccant of the device is ΔH, as can be seen from the cycle on the air side shown in the psychrometric chart of FIG. The amount of heat pumped from the air is Δq, compressor 2
Assuming that the driving energy of 60 is Δh, ΔH = Δq + Δ
h. The cooling effect obtained as a result of the regeneration with the heat quantity ΔH is ΔQ.

As described above, in this dehumidifying air conditioner, the compression heat pump HP is configured to simultaneously cool the processing air of the desiccant air conditioner and heat the regenerated air, and the sensible heat exchanger 104 is provided. Energy savings.

In the dehumidifying air-conditioning apparatus according to the first embodiment, the whole amount of outside air is processed and supplied air without circulating and reusing the air in the air-conditioned space 101. Therefore,
I want to circulate hospitals or odors that are so-called all-air-specification ventilators (air conditioners) or air conditioners that cannot exchange total heat to exchange both sensible heat and latent heat and that require clean air. Suitable for use in restaurants that do not have.

In the conventional apparatus, if the temperature of the outside air is abnormally high and humid, the processing capacity of the desiccant rotor 103 is exceeded, and the state N of the supply air is sufficient to satisfy the temperature condition and the humidity condition of the air-conditioned space 101. Although the humidity does not become low, according to the embodiment of the present invention, the supply air SA can be made sufficiently low since the bypass path is provided.

In general, the dehumidifying air conditioner has an absolute humidity of the outside air of 17 to 18 gr / m ³ and the air condition in the air-conditioned space 101 is a temperature of 27 ° C. and a humidity of 10.5 to 11 gr / m ³
Designed to be. However, the summer is the absolute humidity of the outside air is up to 22~25gr / ^{m 3.} In such a case, the conventional apparatus cannot reduce the humidity of the supply air SA to 10.5 to 11 gr / m ³ or less. Therefore, the opening degree of the control valve 302 is adjusted by the adjuster 301 so that the humidity of the supply air becomes a predetermined value of 10.5 to 11 gr / m ³ or less. That is,
When the humidity of the supply air SA is higher than a desired set humidity, the bypass amount is increased.

By doing so, the desiccant rotor 10
Since the temperature of the air to be treated in Step 3 is low, that is, the relative humidity is high even when the absolute humidity is the same, it is possible to further adsorb moisture as compared with the case where only outside air is used.

Next, a second embodiment will be described with reference to FIG. In this embodiment, a blower 114 is provided in place of the control valve 302 of the first embodiment, and the discharge-side path 115 is connected to the discharge-side path 10 of the blower 102.
8 is connected. Further, the fan 114 can be controlled in rotation speed by an inverter motor.
Therefore, the controller 301 that receives the detection signal from the humidity detector 303 is configured to adjust the rotation speed of the inverter motor.

With this configuration, it is not necessary to make the pressure in the path 107 much lower than the outside air (for example, to insert a throttle between the outside and the path 107) in order to bypass the path 113. Further, the ratio between the outside air amount and the bypass amount, that is, the range of change in the bypass ratio can be widened. The psychrometric chart of the second embodiment is the same as that of FIG.

In the first and second embodiments, the bypass path 113 is branched off from the path 111 on the downstream side of the cooler 210, but the air mixed with the outside air is cooled at least after passing through the desiccant rotor 103. Therefore, it may be branched from the path 110 on the upstream side of the cooler 210 on the downstream side of the heat exchanger 104.

In the above embodiment, the air supplied to the processing air mixed with the supply air to be bypassed is
Although the entire amount is outside air, the invention is not limited to this, and may be applied to a case where air in a part of the air-conditioned space 101 is used (mixed with outside air).

In the above embodiment, the humidity detector 3
03 is preferably an absolute humidity detector, a dew point temperature detector, or a wet bulb temperature detector.

Although the humidity detector 303 has been described as detecting the humidity of the supply air SA in the path 112, the present invention is not limited to this, and the humidity itself may be the air in the air-conditioned space 101. This is because the air is originally the object air to be maintained at a predetermined comfortable temperature and humidity. However, as described in the embodiment, if the humidity of the supply air SA which directly affects the humidity of the air-conditioned space 101 is detected and controlled,
This is preferable because control responsiveness can be improved.

The temperature detector 303 further includes a path 107
The air used as the processing air, which is sucked into the air, is the outside air in the embodiment of FIGS. 1 and 2, but may be the one that detects the humidity of this air. This is because the humidity of the outside air indirectly affects the humidity of the air-conditioned space 101.

As described above, according to the embodiment of the present invention, since the bypass path is provided, the temperature of the processing air at the desiccant inlet can be reduced, the dehumidifying load of the desiccant is reduced, and the desiccant outlet, that is, the supply air is reduced. The absolute humidity can be significantly reduced. It is particularly suitable for use in buildings requiring a low humidity (warehouses, supermarkets, etc.) and buildings (hospitals, etc.) where a large amount of outside air is introduced. Further, even in the case of processing outside air that is easily affected by weather, the bypass amount is controlled to adjust the humidity of the supplied air to a predetermined value, so that it is possible to flexibly respond to changes in weather conditions. As described above, when the humidity of the outside air is so high that the desiccant treatment cannot be achieved in one pass, the air once dehumidified is returned to the desiccant again to adsorb moisture. That is, the fresh air to be newly processed is mixed with the air that has passed through the desiccant once and then cooled, and then passed through the desiccant. The mixing ratio at this time varies depending on the humidity of the outside air.

Further, unlike the conventional outside air conditioner, a humid air is not brought into the room, and a comfortable indoor environment can be maintained. Further, energy can be saved and the operating cost can be reduced by the multiple use of heat by the desiccant and the heat pump.

[0041]

As described above, in the present invention, since the cooled processing air is bypassed and returned to the moisture adsorption device, the humidity of the processing air to which the moisture has been adsorbed by the moisture adsorption device can be sufficiently reduced. It is possible to provide a dehumidifying device.

[Brief description of the drawings]

FIG. 1 is a flowchart of a dehumidifying air conditioner according to a first embodiment of the present invention.

FIG. 2 is a psychrometric chart of the dehumidifying air conditioner of FIG.

FIG. 3 is a flowchart of a dehumidifying air conditioner according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a conventional dehumidifying air conditioner.

5 is a psychrometric chart explaining the operation of the conventional dehumidifying air conditioner shown in FIG.

[Explanation of symbols]

 101 air conditioning space 102, 114, 140 blower 103 desiccant rotor 104 heat exchanger 113 bypass path 210 refrigerant evaporator 220 refrigerant condenser 260 compressor 250 throttle 301 controller 302 control valve (damper) 303 humidity detector HP heat pump

Claims (3)

[Claims] 1. A moisture adsorbing device having a desiccant for adsorbing moisture in processing air; and a process air provided downstream of the flow of the processing air with respect to the moisture adsorbing device, the moisture being adsorbed by the desiccant. A cooler for cooling;
A humidity detector for detecting the humidity of the air in the space that supplies the processing air after being cooled by the cooler or the humidity of the air that affects the humidity of the air in the space; and a humidity detector that is cooled by the cooler. A bypass path for returning the processing air to the moisture adsorption device by bypassing the space; wherein the bypass path adjusts an amount of the processing air passing through the bypass path based on a detection result of the humidity detector. Having a dehumidifier. 2. The dehumidifier according to claim 1, further comprising a heat pump that uses regenerated air for regenerating the desiccant as a high heat source and uses the treated air as a low heat source. 3. The dehumidifier according to claim 2, wherein the cooler is an evaporator on a low heat source side of the heat pump.