JP2002286327A - Dehumidifying/air conditioning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidifying/air conditioning apparatus mainly used for dehumidification wherein a heat output of a reheater is improved, and an operation mode is selected with simple control, and further indoor temperature and humidity are adjusted corresponding to fresh air temperature/humidity conditions. SOLUTION: In a refrigerant circuit, all heat sources of a reheater are realized by discharge gas from a compressor, and cooling/dehumidification, reheating/dehumidification, and heating/dehumidification are ensured by flow passage changeover of three three-way valves. The refrigerant circuit of one system is assumed one unit, and an operation mode is selectively changed over corresponding to fresh air humidity conditions by one or a plurality of the units, and an adjustment for optimum temperature/humidity is achieved with a combination with on/off control of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying air conditioner mainly for dehumidification.

[0002]

2. Description of the Related Art Conventionally, as an example of an air conditioner having a dehumidifying function, there is one described in Japanese Patent Application Laid-Open No. Hei 5-340594. FIG. 4 is a refrigerant circuit diagram prepared based on the description of the publication, and includes a reheating system circulation for circulating a refrigerant in order from a compressor to a temperature control condenser, an expansion mechanism, and a dehumidifying evaporator, and a compressor for discharging heat from a compressor. , The expansion mechanism, and the exhaust heat system circulation for circulating the refrigerant in the order of the dehumidifying evaporator.

A distribution means for changing the refrigerant distribution ratio is provided in each circulation system, and the distribution temperature of the distribution means is adjusted based on the detection of the temperature control state, so that the area temperature of the air conditioning target area reaches the target area temperature. Control means is provided for adjusting the reheat output of the condenser for temperature control so as to be as follows.

[0004]

However, in the above-mentioned conventional example, during reheating, the discharge gas from the compressor is divided into a condenser for exhaust heat and a condenser for temperature control, so that a dehumidifying evaporator is provided. Therefore, complicated control means such as providing the distribution means as described above and adjusting the amount of refrigerant is required.

Further, in the above-mentioned conventional example, when reheating, the discharge gas from the compressor is divided into a condenser for exhaust heat and a condenser for temperature control, and is guided to the evaporator for dehumidification. There is a problem that the reheating efficiency is reduced by performing heat exchange with the outside air in the condenser for use.

A first object of the present invention is to use all the heat source of the reheater as the discharge gas from the compressor to increase the heat output of the reheat dehumidification, minimize the number of parts, and provide a complicated control means. An object of the present invention is to provide an air conditioner whose main purpose is dehumidification without requiring it.

A second object of the present invention is to make it possible to select an operation mode of a cooling dehumidifying operation, a reheating dehumidifying operation, and a heating dehumidifying operation for each unit, and to cope with an outside temperature and humidity condition and an indoor required temperature and humidity condition. Another object of the present invention is to provide a dehumidifying air conditioner that operates one or a plurality of units.

[0008]

According to a first aspect of the present invention, a three-way valve (A) is provided at an inlet of a heat source side heat exchanger (2) which exhausts heat during cooling and absorbs heat during heating, and a three-way valve (A) is provided at an outlet. B), a compressor (1), a three-way valve (A), a heat source side heat exchanger (2), a three-way valve (B), an expansion valve (5), an evaporator (3),
The refrigerant is circulated in the order of the compressor (1) to form a cooling and dehumidifying circuit, and the outlet of the reheater (4) arranged in parallel with the air flow path downstream of the evaporator (3) is passed through the three-way valve (C). To the three-way valve (B), and the branch pipe (a) of the discharge pipe connecting the compressor (1) and the three-way valve (A) to the inlet of the reheater (4). Is connected between the expansion valve (5) and the evaporator (3) via the expansion valve (6), and the compressor (1), the branch pipe (A), the reheater (4), and the three-way valve (C) ), Expansion valve (6),
The refrigerant is circulated in the order of the evaporator (3) and the compressor (1) to form a reheat dehumidification circuit, and a branch pipe (b) of a suction pipe connecting the compressor (1) and the evaporator (3) is provided with a three-way valve (b). A), an expansion valve (7) is provided between the three-way valve (C) and the three-way valve (B), a compressor (1), a branch pipe (a), a reheater (4), a three-way valve (C), the expansion valve (7), the three-way valve (B), the heat source side heat exchanger (2), the three-way valve (A), the branch pipe (B), and the compressor (1) in order to circulate the refrigerant and heat. A dehumidification circuit is provided, and the evaporator (3) and the reheater (4) are arranged in the air flow path of the ventilation mechanism (8), and air is circulated in the order of the evaporator (3) and the reheater (4). It is characterized by:

According to the dehumidifying air conditioner of the first aspect, the heat source of the reheater is all the gas discharged from the compressor, the heat output of the reheat dehumidification can be increased, and the three three-way valves (A) can be used. ), Cooling dehumidification, reheat dehumidification, and heat dehumidification can be performed only by switching the flow paths of (B) and (C).

Further, in the dehumidifying air conditioner of the present invention, the heat source side heat exchanger (2), the evaporator (3),
Each of the heat transfer tubes (20), (30), and (40) of the reheater (4) is connected to one system to form a cooling and dehumidification circuit, a reheat and dehumidification circuit, and a heating and dehumidification circuit.
Alternatively, the evaporator (3) and the reheater (4) in a plurality of units are arranged in parallel in the air flow path of the ventilation mechanism (8),
The air is circulated in the order of the evaporator (3) and the reheater (4).

According to the dehumidifying air conditioner of claim 2, 1
Alternatively, by switching the operation mode of a plurality of units to a cooling dehumidification operation, a reheating dehumidification operation, or a heating dehumidification operation only by switching the flow path of the three-way valve of each unit, an operation corresponding to the outside temperature humidity condition and the indoor temperature humidity condition. Control can be performed.

Further, the dehumidifying air conditioner of the present invention controls the indoor temperature and humidity by starting or stopping one or a plurality of compressors (1) according to the outside temperature and humidity conditions. And

According to the dehumidifying air conditioner of the third aspect,
Alternatively, the operation mode of a plurality of units is switched to a cooling dehumidification operation, a reheating dehumidification operation, or a heating dehumidification operation only by switching the flow path of the three-way valve of each unit. Operation control corresponding to the conditions and the indoor required temperature and humidity conditions can be performed.

[0014]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigerant piping system diagram of a dehumidifying air conditioner. 1 is a compressor, the discharge pipe of which is a three-way valve A b
Connected to port. Reference numeral 2 denotes a heat source side heat exchanger whose inlet is connected to the port a of the three-way valve A and whose outlet is connected to the port a of the three-way valve B. An evaporator 3 has an inlet connected to the port b of the three-way valve B, and an outlet connected to a suction pipe of the compressor. Reference numeral 4 denotes a reheater, which is provided in parallel with the evaporator, and has an inlet connected to a branch pipe a of a discharge pipe of the compressor.
The outlet is connected to the port a of the three-way valve C. Three-way valve C
Is connected to the c port of the three-way valve B. A branch pipe B branched from a suction pipe of the compressor is connected to a port c of the three-way valve A. An expansion valve 5 is provided between the b port of the three-way valve B and the evaporator, and the b port of the three-way valve C is connected between the expansion valve 5 and the evaporator via the expansion valve 6. An expansion valve 7 is provided between the port c of the three-way valve C and the port c of the three-way valve B. Reference numeral 8 denotes a ventilation mechanism, in which an evaporator and a reheater are provided in the air passage. In the figure, 9 is a fan for a heat source side heat exchanger, 10 is an accumulator, and 11 is an air filter.

Next, the refrigerant circuit will be described with reference to FIGS. FIG. 2 shows the relationship between the refrigerant flow direction of the three-way valve and the operation mode.

In the cooling and dehumidifying operation, the three-way valves A, B,
When the flow direction of C is switched to the direction of FIG. 2, the high-pressure gas discharged from the compressor 1 is liquefied by the heat source side heat exchanger 2 via the three-way valve A and passed through the three-way valve B Then, the pressure is reduced by the expansion valve 5, vaporized by the evaporator 3, sucked into the compressor 1, and cooled and dehumidified by the evaporator.

In the reheat dehumidifying operation, the three-way valves A, B,
When the flow direction of C is switched so as to be the direction of FIG. 2, the high-pressure gas discharged from the compressor 1 enters the reheater 4 through the branch pipe A. The air is liquefied by the reheater 4, decompressed by the expansion valve 6 via the three-way valve C, vaporized by the evaporator 3, sucked into the compressor 1, and cooled and dehumidified by the evaporator. I do.

In the heating and dehumidifying operation, the three-way valves A, B,
When the flow direction of C is switched so as to be the direction of FIG. 2, the high-pressure gas discharged from the compressor 1 enters the reheater 4 through the branch pipe A. It is liquefied in the reheater 4 and the air is heated and dehumidified. Thereafter, the pressure is reduced by the expansion valve 7 via the three-way valve C, and enters the heat source side heat exchanger 2 via the three-way valve B. It is vaporized in the heat source side heat exchanger 2 and is sucked into the compressor 1 via the three-way valve A and the branch pipe B.

Next, an operation example of the dehumidifying air conditioner of the present invention will be described with reference to FIG.

FIG. 3 shows an embodiment of the operation of the dehumidifying air conditioner of the present invention. (First line) The item name column displays, from the left, the outside air temperature, the outside air humidity, the weather, the number of units, the room temperature, the room humidity, the number of operating compressors, and the operation mode ratio. The number of units is four in this embodiment.

The upper half of the drawing shows an operation mode corresponding to the outside air in fine weather, and the lower half of the drawing shows an operation mode corresponding to the outside air in rainy weather. The outside air temperature is indicated at intervals of 5 degrees from 35 degrees to $ 5 degrees in fine weather, and 3 degrees in rainy weather.
0 degrees to $ 5 degrees are shown at 5 degree intervals. The design condition of the outside air humidity is 95% in fine weather and 100% in rainy weather. However, the humidity at an outside air temperature of 35 degrees is 65%.

The figure will be described in order from the top.
The 0th line shows an operation example in the case of fine weather. (Second line) When the outside air temperature is 35 ° C. and the outside air humidity is 65%, when the cooling and dehumidifying operation is performed for all four units, the room temperature is adjusted to 34.8 ° C. and the room humidity is adjusted to 52%. (Third line) When the outside air temperature is 30 ° C. and the outside air humidity is 95%, when the cooling and dehumidifying operation is performed for all four units, the indoor temperature becomes 31.3.
The room humidity is adjusted to 64%. (Fifth line) In the case where the outside air temperature is 20 degrees and the outside air humidity is 95%, when the cooling and dehumidifying operation is performed for all four units, the room temperature is adjusted to 22 degrees and the room humidity is adjusted to 63%.

(Line 6) Outside air temperature 15 degrees, outside air humidity 95
%, When two units are operated for cooling and dehumidification and two units are operated for reheating and dehumidification, the room temperature is adjusted to 21.2 degrees and the room humidity is adjusted to 49%.

(Line 7) Outside air temperature 10 degrees, outside air humidity 95
In the case of%, if one unit is stopped and three units are heated and dehumidified, the room temperature is adjusted to 17.4 degrees and the room humidity is adjusted to 62%.

(Line 10) Outside air temperature △ 5 ° C., outside air humidity 9
In the case of 5%, when the heating and dehumidifying operation is performed for all four units, the indoor temperature is adjusted to 5.8 degrees and the indoor humidity is adjusted to 45%.

Next, as an operation example in the case of rainy weather, (11)
Line) When the outside air temperature is 30 degrees and the outside air humidity is 100%,
When three units are cooled and dehumidified and one unit is reheated and dehumidified, the room temperature is 31.8 degrees and the room humidity is 68%.
It is adjusted to. . (Line 12) When the outside air temperature is 25 degrees and the outside air humidity is 100%, two units are cooled and dehumidified.
When the unit is reheated and dehumidified, the room temperature becomes 28 degrees,
Room humidity is adjusted to 61%.

As described above, this figure shows an example in which the outside air humidity is maximized at the yearly outside air temperature in fine weather and rainy weather. However, if the outside air humidity decreases, the operation mode corresponding to the case is changed. By selecting, more comfortable room temperature and room humidity can be obtained.

It should be noted that the outside air intake in this working example is designed with 100% outside air intake in consideration of the environment of the coating plant. For this reason, an operation example of air conditioning mainly for dehumidification under severe conditions having a larger heat load than ordinary air conditioning is shown.

In the above example, the number of units is four, but the ratio of the operation modes can be changed by changing the number of units.

The selection of each of the above-mentioned operation modes can be made semi-automatically or fully automatically by sequencer control by detecting outside, outside temperature and humidity, indoor humidity and the like, which are manually performed.

The present invention can be applied not only to the dehumidifying air conditioner of the coating plant of the above-described embodiment but also to general air conditioners, and it is necessary to dehumidify foods, woods, chemicals, etc. by drying and preserving them. It can also be applied to cases.

[0033]

According to the dehumidifying air conditioner of the first aspect,
The heat source of the reheater is all gas discharged from the compressor, so that the heat output of the reheat dehumidification can be increased, and only by switching the three three-way valves (A), (B) and (C). Cooling dehumidification, reheat dehumidification, and heat dehumidification can be performed.

According to the dehumidifying air conditioner of the second aspect, the operation mode of one or a plurality of units is changed only by switching the flow path of the three-way valve of each unit, the cooling dehumidifying operation, the reheating dehumidifying operation, and the heating dehumidifying operation. By switching to, operation control corresponding to the outside air temperature and humidity conditions and the indoor required temperature and humidity conditions can be performed.

Further, according to the third aspect of the present invention, the operation mode of one or a plurality of units is changed only by switching the flow path of the three-way valve of each unit to a cooling dehumidifying operation, a reheating dehumidifying operation, and a heating dehumidifying operation. In addition, the operation control corresponding to the outside air temperature and humidity conditions and the indoor required temperature and humidity conditions can be performed by turning on / off the compressor of each unit.

[Brief description of the drawings]

FIG. 1 is a refrigerant piping system diagram of a dehumidifying air conditioner of the present invention.

FIG. 2 is a diagram showing a relationship between a refrigerant flow direction of a three-way valve and an operation mode.

FIG. 3 is a diagram showing an operation example of the dehumidifying air conditioner of the present invention.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Heat source side heat exchanger 3 Evaporator 4 Reheater 5, 6, 7 Expansion valve 8 Ventilation mechanism 9 Fan for heat source side heat exchanger 10 Accumulator 11 Air filter 20, 30, 40 Heat transfer tube A, B, C Three-way valve A, B Branch piping

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F25B 1/00 361 F25B 1/00 361J

Claims (3)

[Claims] 1. A three-way valve (A) is provided at the inlet and a three-way valve (B) is provided at the outlet of a heat-source-side heat exchanger (2) that exhausts heat during cooling and absorbs heat during heating. (A), a heat source side heat exchanger (2), a three-way valve (B), an expansion valve (5), an evaporator (3), and a compressor (1). The outlet of the reheater (4) arranged in parallel with the downstream side of the air flow path of (3) is connected to the three-way valve (B) via the three-way valve (C).
And a branch pipe (a) of a discharge pipe connecting the compressor (1) and the three-way valve (A) is connected to an inlet of the reheater (4), and a three-way valve (C) is connected to the expansion valve (5). And an evaporator (3) connected via an expansion valve (6), a compressor (1), a branch pipe (A), a reheater (4), a three-way valve (C), and an expansion valve (6). ),
The refrigerant is circulated in the order of the evaporator (3) and the compressor (1) to form a reheat dehumidification circuit, and a branch pipe (b) of a suction pipe connecting the compressor (1) and the evaporator (3) is provided with a three-way valve (b). A), an expansion valve (7) is provided between the three-way valve (C) and the three-way valve (B), a compressor (1), a branch pipe (a), a reheater (4), a three-way valve (C), the expansion valve (7), the three-way valve (B), the heat source side heat exchanger (2), the three-way valve (A), the branch pipe (B), and the compressor (1) in order to circulate the refrigerant and heat. A dehumidification circuit is provided, and the evaporator (3) and the reheater (4) are arranged in the air flow path of the ventilation mechanism (8), and air is circulated in the order of the evaporator (3) and the reheater (4). A dehumidifying air conditioner characterized by the above-mentioned. 2. A heat exchanger tube (2) for a heat source side heat exchanger (2), an evaporator (3), and a reheater (4) are provided in one compressor (1).
0), (30), and (40) are connected by one-system piping to form a cooling dehumidification circuit, a reheating dehumidification circuit, and a heating dehumidification circuit, and the evaporator (3) and the evaporator (3) in one or a plurality of units are defined as one unit. Ventilation mechanism (8) in parallel with reheater (4)
The dehumidifying air conditioner according to claim 1, wherein the air flow path is disposed in the evaporator (3) and the reheater (4) is circulated in this order. 3. The indoor temperature / humidity control is performed by starting or stopping one or a plurality of compressors (1) in accordance with the outside air temperature and humidity conditions. The dehumidifying air conditioner as described.