JPH09152227A - Air conditioner using absorption type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of the dehumidifying operation by attaching a dehumidifying heat exchanger that heat discharge cooling water flows from a cooling coil to the downstream side of the air flow generated by a blower with respect to the air conditioning heat exchanger of an air conditioner, thereby making it possible to conduct the dehumidifying operation without providing a heating source separately. SOLUTION: This air conditioner comprises an absorption type refrigerator 100 having a refrigerator body 101 and a cooling tower CT as an outdoor unit, and an indoor unit CU. The body 101 has a high temperature regenerator 1 and a low temperature regenerator 2, and a gas burner B disposed under the regenerator 1. In this case, the unit CU has an air conditioning heat exchanger 44, and a dehumidifying heat exchanger 45 aligned with the downstream side of the air flow of a blower 46. The exchanger 45 is coupled to a branch cooling water channel 36 to circulate high temperature cooling water before cooling by the operation of a three-way switching solenoid valve 35, thereby realizing the dehumidifying air conditioning without drop of the diffusing temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using an absorption type refrigerating apparatus which uses an aqueous solution such as lithium bromide as an absorption liquid.

[0002]

2. Description of the Related Art In an air conditioner using an absorption refrigerating apparatus, during cooling operation, a regenerator heats a low concentration absorbent by boiling with a burner to generate a high concentration absorbent and a refrigerant fluid.
In the evaporator, the refrigerant liquid is sprayed on the inside of the evaporation coil through which cold / hot water as a heat medium for air conditioning flows, and the heat of vaporization is taken from the evaporation coil to be evaporated to cool the cold / hot water. The evaporated refrigerant is absorbed by the high-concentration absorbent that has been sprayed in the absorber that sprays the high-concentration absorbent onto the cooling coil through which the cooling water for exhaust heat flows. The absorption heat generated when the refrigerant vapor is absorbed is absorbed by the cooling water and the temperature is maintained, so that the absorption capacity on the surface of the absorption coil is maintained.

The low-concentration absorption liquid, which has absorbed the refrigerant to have a low concentration, returns to the regenerator from the low-concentration absorption liquid flow path provided with the absorption liquid pump. The cold / hot water is circulated from the evaporation coil to the indoor air conditioning unit by the cold / hot water pump through the cold / hot water pipe. The indoor air conditioning unit is composed of a heat exchanger and a blower, and the indoor air is heat-exchanged by the heat exchanger and blows out into the room. The cooling water is circulated from the cooling coil to the cooling tower by the cooling water pump through the cooling water pipe to be cooled.

[0004]

This air conditioning unit is
Although it is possible to cool the indoor air by the cooling operation, it is necessary to attach a separate heating source such as an electric heater to perform the dehumidification operation that prevents the temperature of the blowout air from decreasing and reduces only the humidity. There is a problem that the operating cost becomes expensive. An object of the present invention is to provide an air conditioner using an absorption refrigerating device that can reduce the operating cost of dehumidifying operation.

[0005]

SUMMARY OF THE INVENTION The present invention separates a low-concentration absorbent into a high-concentration absorbent and a refrigerant in a regenerator, and in the evaporator, an evaporation coil through which cold / hot water as a heat medium for air conditioning flows. The refrigerant liquid is sprayed to evaporate and the cold and hot water is cooled, and in the absorber, the absorbent is sprayed and evaporated to the cooling coil which is connected to the cooling tower and through which the cooling water for exhaust heat flows. Absorption refrigerant, absorption-type refrigerating device that returns to the regenerator by an absorption liquid pump provided in a low-concentration absorption liquid flow path, which is a low-concentration absorption liquid that has absorbed the refrigerant and has a low concentration, and is connected to the evaporation coil In an air conditioner consisting of an indoor unit equipped with an air conditioning heat exchanger in which the hot and cold water circulates and a blower, with respect to the air conditioning heat exchanger of the air conditioner, on the downstream side of the air flow generated by the blower, from the cooling coil to the waste heat Coolant annexed dehumidifying operation heat exchanger flows in.

According to another aspect of the invention, the absorption refrigeration system has a condenser provided with a cooling coil for liquefying the separated refrigerant, and the cooling water is a cooling tower and a cooling coil of the absorber. , A cooling coil of the condenser, and a cooling water flow path that connects the cooling tower. In the invention according to claim 3, a branch cooling water passage to the heat exchanger for dehumidification operation is provided in the middle of the cooling water passage connecting the cooling coil and the upstream of the cooling tower, and the branch cooling water passage is opened and closed. A solenoid valve for dehumidifying operation was provided for this purpose.

[0007]

In this air conditioner, the dehumidifying operation is performed by heating the conditioned air after being cooled by using the exhaust heat of the cooling water and having the water content reduced by condensation, so that the heat transfer is performed. Dehumidification operation is possible without separately providing a heating source such as a heater. Therefore, the dehumidifying operation can be operated at the same cost as the cooling operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an air conditioner, which is equipped with an absorption type refrigerating apparatus 100 composed of a refrigerator body 101 and a cooling tower (cooling tower) CT as an outdoor unit,
An indoor unit (cooling unit) CU is attached.
This air conditioner is controlled by the control device 102.

The refrigerator main body 101 comprises a high temperature regenerator 1 and a low temperature regenerator 2, and a gas burner B as a heating source is arranged below the high temperature regenerator 1. Low temperature regenerator 2
An absorber 3 and an evaporator 4 are provided on the outer periphery of the, and a condenser 5 is installed above the evaporator 4.

The high-temperature regenerator 1 is heated by the gas burner B to boil the low-concentration absorption liquid inside the heating tank 1.
1 and a medium-concentration absorbent separation column 12 that extends upward from the top of the heating tank 11 and separates the refrigerant vapor and the medium-concentration absorbent that has been concentrated by evaporation of the refrigerant vapor. A vertical cylindrical airtight refrigerant recovery tank 10 for recovering the refrigerant vapor is provided on the outer periphery of the medium-concentration absorbent separation column 12.

The low temperature regenerator 2 is a vertical cylindrical low temperature regenerator case 2 installed eccentrically on the outer periphery of the refrigerant recovery tank 10.
Has zero. The low temperature regenerator case 20 is provided with a refrigerant vapor outlet 21 on the ceiling and has a top portion connected to the bottom portion 121 of the medium concentration absorbent separation column 12 by the medium concentration absorbent flow path L1.

A medium-concentration absorption liquid is supplied into the low-temperature regenerator case 20 through the heat exchanger H due to a pressure difference, and re-boils using the outer wall of the refrigerant recovery tank 10 as a heat source to generate refrigerant vapor and high-concentration absorption liquid. And separated. The outer periphery of the low temperature regenerator case 20 has a vertical cylindrical airtight evaporation / absorption case 30.
Are arranged concentrically, and a condenser case 50 is provided above the evaporation / absorption case 30.

Refrigerant recovery tank 10, low temperature regenerator case 2
The evaporation / absorption case 30 is integrally welded to the bottom plate 13 to form the refrigerator main body 101. The upper part of the low temperature regenerator case 20 serves as a gas-liquid separating section 22, which communicates with the inside of the condenser case 50 through the refrigerant vapor outlet 21 and the gap 5A.

In the absorber 3, a cooling coil 31 wound in a vertical cylindrical shape is arranged in an inner portion of the evaporation / absorption case 30, and a high-concentration absorbent is sprayed above the cooling coil 31. The high-concentration absorbent sprayer 32 is attached. The absorber 3 is used during the cooling operation, and the exhaust heat cooling water cooled by the cooling tower CT circulates in the cooling coil 31.

High-concentration absorbent receiving part 23 of the low temperature regenerator 2.
Is connected to the high-concentration absorbent dispersion device 32 through the high-concentration absorbent supply path L2 via the heat exchanger H. The cooled high-concentration absorption liquid flows into the high-concentration absorption liquid sprayer 32 due to the pressure difference, and the high-concentration absorption liquid that has flowed in is cooled by the cooling coil 3.
1 is sprayed on the upper end of the cooling coil 31, adheres to the surface of the cooling coil 31 to form a film, and flows downward by the action of gravity.
Between the bottom 33 of the absorber 3 and the bottom of the heating tank 11,
The heat exchanger H and the absorption liquid pump P1 are connected by a low-concentration absorption liquid flow path L3.

The evaporator 4 is provided with a vertical cylindrical partition wall 40 with a communication port on the outer periphery of the cooling coil 31 in the evaporation / absorption case 30, and the interior of the partition wall 40 is cooled and heated for cooling and heating. Arranged vertical cylindrical evaporation coil 41 through which water flows,
A refrigerant liquid spraying tool 42 is attached above it. The bottom portion 43 of the evaporator 4 communicates with the bottom portion 121 of the medium-concentration absorption liquid separation cylinder 12 through the heating absorption liquid flow path L4 having the heating electromagnetic valve 6.

The refrigerant liquid sprinkler 42 is used during the cooling operation and drops the refrigerant liquid on the evaporation coil 41. The dripped refrigerant wets the surface of the evaporation coil 41 due to surface tension, becomes a film, and drops downward due to the action of gravity, while depriving the evaporation coil 41 of heat of vaporization in the evaporation / absorption case 30 at a low pressure. To evaporate and cool the hot and cold water for cooling and heating flowing in the evaporation coil 41.

The condenser 5 is used during a cooling operation, and has a cooling coil 51 in which the cooling water for exhaust heat cooled by the cooling tower CT is circulated inside the condenser case 50. . The condenser case 50 communicates with the bottom portion 14 of the refrigerant recovery tank 10 through the refrigerant flow path L5, and also communicates with the low temperature regenerator 2 through the refrigerant vapor outlet 21 and the gap 5A, both of which cause a refrigerant difference due to a pressure difference. Is supplied.

The refrigerant supplied to the condenser case 50 is cooled by the cooling coil 51 and liquefied. The lower part of the condenser 5 and the refrigerant liquid spraying tool 42 installed above the evaporation coil 41 of the evaporator 4 communicate with each other through a refrigerant liquid supply passage L6.
The liquefied refrigerant liquid is supplied to the refrigerant liquid sprinkler 42 through the refrigerant cooler 52 provided in the refrigerant liquid supply path L6.

In this embodiment, the cooling coil 31 is connected to the cooling coil 51, and the cooling tower CT and the cooling water flow path 34 are further connected.
Connected by A cooling water pump P is provided in the cooling water passage 34.
2 is attached to the cooling tower CT, and the cooling water which has a relatively high temperature by absorbing the absorption heat and the condensation heat in the cooling coil 31 and the cooling coil 51 is supplied to the cooling tower CT. In the cooling tower CT, self-cooling is performed by partially evaporating the cooling water that falls into the atmosphere and cooling the remaining cooling water. Forming an exhaust heat cycle that reaches the temperature. The air blown from the blower S promotes the evaporation of the water.

A three-way switching solenoid valve 35, which is a solenoid valve for dehumidification operation, is provided in a cooling water flow passage 34 between the outlet of the cooling coil 51 and the cooling tower CT, and a branch cooling water flow passage 36 is connected thereto. The indoor unit CU includes an air conditioning heat exchanger 44, a dehumidifying operation heat exchanger 45 arranged in parallel with the air conditioning heat exchanger 44 on the downstream side of an air flow by a blower 46 described later, and the blower 4.
It consists of 6.

In this embodiment, a blower 46 is used, and the blower 46, the air conditioning heat exchanger 44, and the dehumidifying operation heat exchanger 45 are arranged in this order in accordance with the flow of air. If the blower 46 is of a suction type, as shown in FIG. 2, the air conditioning heat exchanger 44 → the dehumidifying operation heat exchanger 45.
→ Place the blower 46 in that order. Both ends of the evaporation coil 41 are connected to an air conditioning heat exchanger 44 provided in the indoor unit CU by a cold / hot water flow path 47 formed of a rubber hose or the like.

A cold / hot water pump P3 is provided in the cold / hot water passage 47 to circulate cold / hot water of low temperature through the air conditioning heat exchanger 44. The heat exchanger 45 for dehumidification operation is connected to the branch cooling water flow path 36, and the high-temperature cooling water before being cooled in the cooling tower CT is supplied by the operation of the three-way switching electromagnetic valve 35 and flows out to the cooling tower CT. To do.

With this configuration, during the cooling operation, the cooling water is supplied from the cooling water pump P2 to the cooling tower CT → the cooling coil 3
It circulates in the order of 1 → cooling coil 51 → cooling tower CT.
The absorbing liquid circulates in the order of the high temperature regenerator 1, the low temperature regenerator 2, the absorber 3, the absorbing liquid pump P1, and the high temperature regenerator 1.
Further, the low-temperature cold / hot water circulates in the order of the evaporation coil 41 → the cold / hot water passage 47 → the air conditioning heat exchanger 44 → the cold / hot water passage 47 → the cold / hot water pump P3 → the evaporation coil 41, and the room is cooled by the blower 46. To be done.

When the dehumidifying operation is selected, the absorption refrigeration system 100 supplies cold / hot water of low temperature to the air conditioning heat exchanger 44 provided in the indoor unit CU through the cold / hot water flow path 47, and
The three-way switching solenoid valve 35 is operated by the output of the control device 102, and a part or all of the high-temperature cooling water is supplied from the branch cooling water flow path 36 to the dehumidifying operation heat exchanger 45.

In the air conditioning, all the high temperature cooling water may flow to the dehumidifying operation heat exchanger 45 through the branch cooling water passage 36, and the branch cooling water passage 36 and the cooling water passage downstream of the branch point. It is also possible to flow to both of 34. At this time, in order to control the flow rate of the high-temperature cooling water to the branch cooling water passage 36, a distribution valve may be changed by providing a throttle valve in the branch cooling water passage 36,
The distribution ratio between the branched cooling water flow passage 36 and the cooling water flow passage 34 may be changed by intermittently controlling the three-way switching electromagnetic valve 35.

As a result, the conditioned air that has been cooled by the air conditioning heat exchanger 44 and whose moisture content has been reduced by condensation is heated by the heat exchanger 45 for dehumidification operation, and dehumidification air conditioning is performed without lowering the blowout temperature. . Instead of the three-way switching solenoid valve 35, an on-off valve may be used for each of the branch cooling water flow passage 36 and the cooling water flow passage 34 on the downstream side of the branch point,
Only one branch cooling water flow path 36 may be provided.

During heating operation, the heating solenoid valve 6 is opened,
Operate the absorbent pump P1. The high-temperature medium-concentration absorption liquid flows into the evaporator 4 from the bottom portion 43. The cold / hot water in the evaporation coil 41 is heated and supplied to the indoor unit CU through the cold / hot water flow path 47 by the cold / hot water pump P3, and serves as a heat source for heating.
The medium-concentration absorption liquid in the evaporator 4 enters the absorber 3 side from the communication port of the partition wall 40, passes through the low-concentration absorption liquid flow path L3, and is returned to the heating tank 11 by the absorption liquid pump P1.

During the heating operation, the branch cooling water passage 36 is closed by the three-way switching solenoid valve 35. In addition to the gas burner B, another heat source such as an electric heater can be used as the heating source.

FIG. 3 shows an air conditioner according to the third embodiment.
In this embodiment, the cooling water flow path 34 in which cooling water circulates in the order of cooling tower CT → cooling coil 31 → cooling coil 51 → cooling tower CT is different from the first or second embodiment. Is a closed circuit that is not open to the atmosphere. The cooling tower CT includes a water cooling heat exchanger 71 that radiates cooling water and a water cooling device 7 that cools the water cooling heat exchanger 71 with water.
It consists of 0.

The water cooling device 70 includes a water sprinkling tank 72 for radiating water installed above the water cooling heat exchanger 71, radiating fins 73 attached to the water cooling heat exchanger 71, and a water receiver installed below the water cooling heat exchanger 71. It comprises a tank 74, a pumping line 60 having a pumping pump P4 for pumping radiation water from the water receiving tank 74 to the sprinkling tank 72, and a water source pipe 76.

During cooling or dehumidifying operation of the air conditioner, radiating water is sprayed from the sprinkling tank 72 to the water cooling heat exchanger 71,
A part of the water-cooling heat exchanger 71 removes heat of vaporization and evaporates to cool the cooling water. The cooling water remaining without being evaporated flows down to the water receiving tank 74. The pumping pipeline 60 is connected to the water source pipeline 76, and the water level sensor 77 provided in the water receiving tank 74 supplies water from the water source pipeline 76 when the amount of water in the water receiving tank 74 falls below a set level. . A blower 78 is installed on the side of the water-cooled heat exchanger 71 to accelerate evaporation of water from the heat radiation fins 73.

In this embodiment, since the cooling water flow path 34 is a closed circuit, the cooling water is clogged due to replenishment or dirt of the cooling water as compared with the case where the cooling water is self-cooled by partially evaporating the cooling water. In addition, it is easy to mix the rust preventive agent into the cooling water, and the maintainability can be improved.

FIG. 4 shows an air conditioner according to the fourth embodiment.
In this embodiment, the water cooling device 70 in the third embodiment is omitted, and an air-cooling heat exchanger 8 that constitutes a part of the cooling water flow passage 34, and a blower 81 that supplies cooling air to the air-cooling heat exchanger 8. Therefore, the cooling water is dissipated. Also in this embodiment, since the cooling water flow path 34 is a closed circuit, the same effect as described above can be obtained, and since the water cooling device 70 is unnecessary, there is an advantage that the structure of the cooling tower CT can be simplified.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an air conditioner using an absorption refrigeration system.

FIG. 2 is a schematic configuration diagram of an indoor unit according to a second embodiment.

FIG. 3 is a conceptual diagram of an air conditioner according to a third embodiment.

FIG. 4 is a conceptual diagram of an air conditioner according to a fourth embodiment.

[Explanation of symbols]

 1 High-temperature regenerator 2 Low-temperature regenerator 3 Absorber 30 Evaporation / absorption case 31 Cooling coil 34 Cooling water flow path 35 Three-way switching solenoid valve (solenoid valve for dehumidification operation) 4 Evaporator 40 Partition cylinder 41 Evaporation coil 44 Air conditioning heat exchanger 45 Dehumidifying heat exchanger 46 Blower 47 Cooling water flow path 5 Condenser 51 Cooling coil 70 Water cooling device 71 Water cooling heat exchanger 75 Water supply means 78 Blower 100 Absorption type refrigeration device 101 Refrigerator body CU Indoor unit CT Cooling tower P1 Absorption liquid pump L3 low concentration absorbent flow path

Claims (5)

[Claims] 1. A regenerator separates a low-concentration absorption liquid into a high-concentration absorption liquid and a refrigerant, and in the evaporator, the refrigerant liquid is sprayed and evaporated on an evaporation coil through which cold / hot water as a heat medium for air conditioning flows. While cooling the cold and hot water, in the absorber, while being connected to the cooling tower, the absorption liquid is sprayed to the cooling coil through which the cooling water for exhaust heat flows to absorb the evaporated refrigerant and absorb the refrigerant. Absorption refrigeration device that returns the low-concentration absorption liquid that has been reduced in concentration to the regenerator by the absorption liquid pump provided in the low-concentration absorption liquid channel; In an air conditioner including an indoor unit including an exchanger and a blower, cooling water for exhaust heat flows from the cooling coil to a downstream side of an air flow generated by the blower with respect to an air conditioning heat exchanger of the air conditioner. Dehumidification operation Air conditioner using an absorption type refrigerating apparatus characterized by annexed heat exchanger. 2. The absorption refrigeration apparatus according to claim 1, further comprising a condenser having a cooling coil for liquefying the separated refrigerant, wherein the cooling water is the cooling tower and the absorber. An air conditioner using an absorption type refrigerating device, which circulates through a cooling water flow path connecting the cooling coil of 1., the cooling coil of the condenser, and the cooling tower. 3. The branch cooling water flow path to the heat exchanger for dehumidification operation according to claim 1, wherein a branch cooling water flow path is provided in the middle of the cooling water flow path connecting the cooling coil and the upstream of the cooling tower. An air conditioner using an absorption type refrigerating device, which is provided with a dehumidifying operation electromagnetic valve for opening and closing a cooling water flow path. 4. The cooling tower according to claim 1, wherein the cooling tower comprises a water-cooled heat exchanger through which cooling water flows, and a water supply means for supplying radiating water to the water-cooled heat exchanger.
An air conditioner using an absorption refrigeration system, wherein the cooling water circulation path forms a closed circuit that is not exposed to the atmosphere. 5. The cooling tower according to claim 1, wherein the cooling tower comprises a water-cooled heat exchanger in which cooling water flows, and a blower for supplying radiating air to the water-cooled heat exchanger.
An air conditioner using an absorption refrigeration system, wherein the cooling water circulation path forms a closed circuit that is not exposed to the atmosphere.