JPH0596123A - Dehumidifier - Google Patents

Abstract

PURPOSE:To provide a dehumidifier where both cooled dry air and dry air which is the reheated dry are taken out. CONSTITUTION:High temp. wet air enters from a precooling route 11 and is delivered to a cooling route 12 where a refrigerating pipe 13 is arranged. The cooling route 12 is connected to a heat transfer route 14 through a connecting route 15 and the connecting route 15 is connected to a branch 12 branched into that in the heat transfer route 14 and that in the branch route 18. The cooled dry air is taken out from the branch route 18 side through a flow control valve 19. Heat exchange is performed between the high temp. wet air and the cooled dry air delivered to the heat transfer route 14, through the heat transfer route 14, to re-heat the cooled dry air. The reheated dry air is taken out through a flow control valve 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying device that dehumidifies by heat exchange.

[0002]

2. Description of the Related Art As a device for dehumidifying by heat exchange, there are two types of dehumidifying devices shown in FIGS.

In the apparatus shown in FIG. 3, hot and humid air enters the pre-cooling passage 1 as shown by the arrow R ₀ , passes through the pre-cooling passage 1 and enters the cooling passage 2. The cooling passage 2 is in contact with a refrigerating pipe 3 and a heat exchange fin (not shown) that guide the refrigerant, and the air passing through the cooling passage 2 is cooled by a refrigerator including the refrigerating pipe 3 and the heat exchange fin. Dehumidification is performed by this cooling, and the high temperature moist air becomes cooled dry air. The cooling dry air enters the heat transfer passage 4 and is taken out from the heat transfer passage 4 as shown by an arrow S ₁ . The pre-cooling passage 1 is in contact with the heat transfer passage 4, and the hot and humid air passing through the pre-cooling passage 1 is pre-cooled by the cooling dry air in the heat transfer passage 4 and the temperature of the cooling dry air rises. That is, in this device, the dry air reheated while passing through the heat transfer passage 4 is taken out and used as shown by an arrow S ₂ . 5 is a drain outlet.

In the apparatus shown in FIG. 4, there is no pre-cooling passage, high temperature moist air directly enters the cooling passage 2 as shown by an arrow R ₀ , and the cooling dry air cooled by the refrigerator composed of the refrigerating pipe 3 and the heat exchange fins is supplied. It is directly taken out and used as shown by arrow T.

[0005]

The reheated dry air obtained by the apparatus of FIG. 3 is used to drive air equipment such as a cylinder, and the cooled dry air obtained by the apparatus of FIG. 4 is used for cooling, for example, in casting cutting. Used. In order to use the reheated dry air and the cooled dry air at the same time, both the apparatus shown in FIG. 3 and the apparatus shown in FIG. 4 are required, which causes a problem of installation space and cost.

An object of the present invention is to provide a dehumidifying device which can reduce the installation space and cost even when the reheated dry air and the cooled dry air are used at the same time.

[0007]

Therefore, according to the present invention,
A cooling passage in contact with the refrigerator, a heat transfer passage for guiding the air passing through the cooling passage, and a pre-cooling passage in contact with the heat passage are provided, and the branch passage is connected to the connection passage between the cooling passage and the heat transfer passage. The dehumidifier is configured so that the air passing through the heat transfer passage and the air passing through the branch passage can be taken out.

[0008]

[Function] The hot and humid air enters the cooling passage through the pre-cooling passage, and the air that has been dehumidified in the cooling passage and passed through the heat transfer passage exchanges heat with the hot and humid air in the pre-cooling passage. Do. The cooling dry air passed through the heat transfer passage is reheated by this heat exchange and taken out, and the cooling dry air passed through the branch passage is taken out as it is.

A pair of flow rate adjusting valves for respectively adjusting the flow rates from the heat transfer passage and the branch passage, a flow rate detector, and a control circuit for feedback controlling the pair of flow rate adjusting valves based on flow rate information obtained from the flow rate detector. By controlling the extraction amounts of the reheated dry air and the cooled dry air so that the heat load is kept constant by the control device consisting of, the refrigerator is not overloaded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS. Reference numeral 11 denotes a pre-cooling passage, in which hot and humid air enters the pre-cooling passage 11 as shown by an arrow R ₁ , passes through the pre-cooling passage 11 as shown by an arrow R ₂ , and enters the cooling passage 12. The cooling passage 12 is in contact with a refrigerating pipe 13 and a heat exchange fin (not shown) that guide the refrigerant, and the air passing through the cooling passage 12 is cooled by a refrigerator including the refrigerating pipe 13 and the heat exchange fin. Dehumidification is performed by this cooling, and the high temperature moist air becomes cooled dry air.

A heat transfer passage 14 is connected to the cooling passage 12 through a connection passage 15. Cooling dry air enters the heat transfer passage 14 through the connection passage 15 as shown by an arrow S ₃ , and the heat transfer passage 14 Taken from. The pre-cooling passage 11 is in contact with the heat transfer passage 14, and the high temperature moist air passing through the pre-cooling passage 11 is pre-cooled and dehumidified by the cooling dry air in the heat transfer passage 14, and the temperature of the cooling dry air rises. Heat transfer passage 14
The dry air reheated while passing through is taken out through the flow rate adjusting valve 17 on the taking-out passage 16 as shown by an arrow S ₄ .

Reference numeral 22 is a drain outlet. A branch passage 18 is connected to the connection passage 15, and the cooling dry air passed through the branch passage 18 is taken out via a regulating valve 19 and a flow rate detector 20 as shown by an arrow S ₅ .

The flow rate information of the flow rate detector 20 is obtained by the control circuit 21.
The control circuit 21 feedback-controls the valve opening of the flow rate adjusting valves 17 and 19 based on the flow rate information. This valve opening control is performed so that the heat load is constant.

This heat load is shared by precooling and cooling as shown in the following equation (1). However, Q represents a heat load, and x represents a heat load share ratio (0 ≦ x ≦ 1). Q = Q (1-x) + Qx (1) Further, the flow rate ratio between the reheat dry air and the cooling dry air is (1-
y): When y, the heat load Q is also represented by the following equation (2). Q = γG (h _1a −h _2a ) (1-y) + γG (h _2a −h _3a ) (1-y) + γG (h _1a −h _3a ) y (2) However, h _1a is high temperature and wet The enthalpy of air, h _2a is the enthalpy of pre-cooled dehumidified air dehumidified through the pre-cooling passage 11, h _3a is the enthalpy of cooled dry air, γ is the specific weight of air, and G is the weight flow rate of air.

The cooling capacity Qe of the refrigerator is expressed by the following equation (3).
Be done. Qe = γG (h_2a-H_3a) (1-y) + γG (h_1a-H_3a) Y ... (3) (h_2a-H_3a) Is x in the equation (1), and (h_1a
-H_3a) Is (1-x). Therefore, (h_1a−
h_3a) Becomes 1. From this, equation (3) becomes the following equation (4).
It Qe = γGx (1-y) + γGy (4) The weight flow rate G of air is expressed by the following equation (5). G = Qe / {γ [x (1-y) + y]} (5) The ratio R between the reheated dry air and the cooled dry air is expressed by the following equation (6).
To be done. R = γG (h_2a-H_3a) (1-y) / [γG (h_1a-H_3a) Y] = γGx (1-y) / (γGy) = x (1-y) / y (6) The value of x is usually set to about 0.3 to 0.7, but x =
Assuming 0.5, the weight flow rate G and the ratio R are given by the following equation (7),
It is represented by (8). G_{x = 0.5}= 2Qe / [γ (y + 1)] (7) R_{x = 0.5}= (1-y) / 2y (8) Curve C in the graph of FIG.₁, C₂, C₃Qe = constant
The variable y is the ratio of the cooling dry air flow rate to the hot and humid air flow rate.
Expressions (7) and (8) are expressed as follows. That is, curve C ₁Is high temperature
Shows the flow rate of moist air, curve C₂Is the reheat dry air flow rate
And then curve C₃Represents the reheated dry air flow rate. Such a flow
Adjusting the valve opening of the flow rate adjusting valves 17 and 19 so that there is a quantity relationship
If the heat load Qe is always constant, the dehumidifier is overloaded.
It won't be a burden.

Under such a constant heat load, the reheated dry air and the cooled dry air can be taken out from a single dehumidifier and used, and the problems of installation space and cost of the dehumidifier can be solved.

Of course, the present invention is not limited to the above-mentioned embodiment. For example, the flow rate detector may be omitted to perform open loop control, or only one of the reheated dry air and the cooled dry air may be used. It can also be selectively used.

[0018]

As described in detail above, the present invention comprises a cooling passage in contact with the refrigerator, a heat transfer passage for guiding the air passing through the cooling passage, and a precooling passage in contact with the heat transfer passage.
Since the branch passage is connected to the connection passage between the cooling passage and the heat transfer passage, it is possible to take out the excellent effect that the air that has passed through the heat transfer passage and the air that has passed through the branch passage can be separately taken out and used by a single dehumidifier. Play.

[Brief description of drawings]

FIG. 1 is a simplified diagram showing an embodiment embodying the present invention.

FIG. 2 is a graph showing flow curves of reheated dry air and cooled dry air.

FIG. 3 is a simplified diagram showing a conventional dehumidifying device.

FIG. 4 is a simplified diagram showing a conventional dehumidifying device.

[Explanation of symbols]

11 ... Pre-cooling passage, 12 ... Cooling passage, 14 ... Heat transfer passage, 1
5 ... Connection passage, 17 ... Flow control valve, 18 ... Branch passage, 1
9 ... Flow rate adjusting valve, 20 ... Flow rate detector, 21 ... Control circuit.

Claims (2)

[Claims] Claim: What is claimed is: 1. A cooling passage that contacts the refrigerator, a heat transfer passage that guides air that has passed through the cooling passage, and a precooling passage that contacts the heat transfer passage. A dehumidifier characterized in that a branch passage is connected to the air passage so that the air passing through the heat transfer passage and the air passing through the branch passage can be taken out. 2. A pair of flow rate adjusting valves for respectively adjusting flow rates from the heat transfer passage and the branch passage, a flow rate detector, and feedback control of the pair of flow rate adjusting valves based on flow rate information obtained from the flow rate detector. The control device including a control circuit is incorporated, and the amount of air that has passed through the heat transfer passage and the amount of air that has passed through the discharge passage is performed under the constant heat load control of the control device. Dehumidifier.