JPH109622A - Air conditioner using absorption type refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform dehumidifying operation at low operating cost. SOLUTION: The cold liquid side of a liquid-liquid heat exchanger 35 is situated on a cooling water flow path 34 connected to a cooling tower CT from an absorber 3 and the other liquid side on a dehumidifying circuit 60. A dehumidifying heat exchanger 61 of the dehumidifying circuit 60 is arranged parallel with an air conditioning heat exchanger 44 of an indoor unit RU. Waste heat of the absorber 3 is transferred to the dehumidifying circuit 60 by heat exchanging at the liquid-liquid heat exchanger 35 and then to the dehumidifying heat exchanger 61. In the indoor unit RU, the air inside a room is cooled to form dew by the air-conditioner heat exchanger 44 and then heated by the dehumidifying heat exchanger 61. Therefore, dehumidifying alone can take place without a drop in the room temperature. As the waste heat of the absorber 3 is used to re-heat the air inside the room, a heat source for re-heating is not necessary or the quantity of heat of the heat source can be diminished, resulting in a reduction in operating expenses.

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 refrigerating apparatus using an aqueous solution of lithium bromide or the like as an absorbing liquid.

[0002]

2. Description of the Related Art In an absorption refrigeration system, a low-concentration absorbent is heated and boiled by a burner in a regenerator to produce a high-concentration absorbent and a refrigerant liquid. When the high-concentration absorbing liquid is sprayed on the surface of the absorbing coil in the absorber, while the refrigerant liquid is sprayed on the evaporating coil in the evaporator, on the evaporating coil surface, the refrigerant liquid evaporates by taking heat of vaporization from the evaporating coil. On the surface of the absorbing coil, the high-concentration absorbing liquid absorbs the refrigerant vapor and generates heat. Note that, in the absorber, the absorbent that has absorbed the refrigerant and has been reduced in concentration returns to the regenerator by the absorbent pump.

[0003] In the above absorption cycle, the cold and hot water whose heat has been removed by the evaporating coil circulates through a heat exchanger provided in the indoor unit by the operation of the pump and becomes a cooling source in the indoor unit. The indoor unit includes a heat exchanger and a blower, and the indoor air is cooled by a heat exchanger in which cold and hot water supplied from an evaporating coil circulates, and is blown into the room by the blower. At this time, the cold / hot water whose temperature has risen conversely in the heat exchanger of the indoor unit is cooled again by the evaporating coil.

On the other hand, heat generated when the absorbing liquid absorbs the refrigerant vapor on the surface of the absorbing coil is transferred to a cooling tower provided outside by the exhaust cooling water passing through the absorbing coil by the operation of the pump. Moves and is released at the cooling tower. In the cooling tower, in order to increase the cooling efficiency, for example, self-cooling to cool the remaining cooling water by partially evaporating the falling cooling water into the atmosphere, and by blowing air from a blower, Promotes water evaporation.

[0005]

In recent years, there has been a demand for an amenity dry operation of an air conditioner that not only cools down by an indoor unit but also lowers humidity without lowering indoor temperature. However, in the air conditioner using the absorption refrigeration apparatus having the above configuration, in order to perform the amenity dry operation, after cooling the indoor air with the heat exchanger of the indoor unit to form dew, the cooled air is cooled. It is necessary to reheat, which causes a problem that the operating cost of the dehumidifying operation is relatively high.

It is an object of the present invention to provide an air conditioner using an absorption refrigeration system capable of performing a comfortable dehumidifying operation at a low operating cost.

[0007]

According to the first aspect of the present invention, an indoor unit is provided with cold and hot water for air-conditioning, which passes through the inside of an evaporator coil of an evaporator of an absorption refrigerating apparatus having an absorption cycle using an absorption liquid. In the air conditioner which circulates through the air-conditioning heat exchanger, the heat-discharging circuit for radiating the heat-dissipating cooling water circulating in the absorption coil of the absorber of the absorption refrigeration apparatus discharges the cooling water for exhaust heat. A liquid-liquid heat exchanger for releasing heat is provided, and the waste heat exchanged by the liquid-liquid heat exchanger is subjected to heat exchange for dehumidification operation arranged in parallel with the air conditioning heat exchanger of the indoor unit. If a dehumidifying operation circulation circuit is provided to circulate hot water to supply to the
In the indoor unit, technical means is that indoor air is cooled by the air conditioning heat exchanger and then heated by the dehumidifying operation heat exchanger.

With the above arrangement, according to the present invention, the heat generated when the absorbing liquid absorbs the refrigerant in the absorption cycle is:
The cooling water for exhaust heat circulating in the exhaust heat circuit moves to the liquid / liquid heat exchanger provided in the exhaust heat circuit, and is further transmitted to the hot water in the circulation circuit for dehumidifying operation by the liquid / liquid heat exchanger. . In the dehumidifying operation circulation circuit, the transferred heat is transferred to the dehumidifying operation heat exchanger by hot water and becomes a heat source for heating.
In the indoor unit, when the indoor air is cooled by the air-conditioning heat exchanger, the moisture is reduced due to dew condensation, and thereafter, the indoor air is heated by the dehumidifying operation heat exchanger, and the temperature rises again. As a result, air whose humidity is reduced and whose temperature is not reduced can be discharged indoors. As described above, in the present invention, utilizing the absorption heat generated in the absorber in the absorption cycle,
Since the indoor air is reheated during the dehumidifying operation, a new heat source for reheating the air once cooled is not required. Therefore, it is possible to suppress the operating cost in the dehumidifying operation in which the room temperature is not reduced or the degree of the reduction is suppressed.

According to a second aspect of the present invention, in the first aspect, the exhaust heat of the cooling water for exhaust heat is exchanged with the circulation circuit for the dehumidifying operation by the liquid / liquid heat exchanger, and the heat is transferred to the heat exchanger for the dehumidifying operation. Technical means is provided with a heating means for heating the warm water going there. Thereby, the temperature of the room air once cooled can be reliably returned to the original temperature. In addition, since the dehumidifying operation circulation circuit forms a closed circuit by the liquid / liquid heat exchanger and the indoor unit dehumidification operation heat exchanger, sufficient heat insulation treatment of the dehumidification operation circulation circuit is performed. Further, the release of the heat given by the heating means from the circulation circuit for the dehumidifying operation can be suppressed. Therefore, the amount of heat given by the heating means can be suppressed, and the operating cost in the dehumidifying operation can be suppressed to a minimum.

[0010]

FIG. 1 shows an air conditioner according to the present invention. The air conditioner is an absorption refrigeration system 1 as an outdoor unit.
00 and the indoor unit RU, and the absorption refrigeration system 100
Is the refrigerator main body 101 and the cooling tower (cooling tower) C
And T. The air conditioner is controlled by the control device 10
2 is controlled.

The refrigerator main body 101 forms an absorption cycle of a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid, and includes a high-temperature regenerator 1 provided with a gas burner B as a heating source below, and a high-temperature regenerator 1 1, a low-temperature regenerator 2 disposed so as to cover the outside of the low-temperature regenerator 2, and an absorber 3 and an evaporator 4 double-arranged toward the outer periphery of the low-temperature regenerator 2
And a condenser 5 arranged above the absorber 3 on the outer periphery of the low-temperature regenerator 2 through several passages.

The high-temperature regenerator 1 is provided above the heating tank 11 heated by the gas burner B with the medium-concentration absorbent separating cylinder 1.
2, a vertical cylindrical airtight refrigerant recovery tank 10 is provided so as to cover the outer periphery of the medium-concentration absorbing liquid separation tube 12 from above. Thus, in the high-temperature regenerator 1, the low-concentration absorbing liquid contained in the heating tank 11 is heated by the gas burner B, and water as a refrigerant in the low-concentration absorbing liquid is evaporated to form refrigerant vapor (water vapor).
As a result, the separated medium vapor is separated outside the medium-concentration absorption liquid separation cylinder 12, the medium-concentration absorption liquid concentrated by evaporation of the refrigerant vapor is left in the storage section 121 inside the medium-concentration absorption liquid separation cylinder 12, and the separated refrigerant vapor is collected as refrigerant. Collected in tank 10.

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.
0, a refrigerant vapor outlet 21 is provided around the ceiling of the low-temperature regenerator case 20. Low temperature regenerator case 20
The top of the ceiling is connected to the storage part 121 of the middle-concentration absorbent separation cylinder 12 via the heat exchanger H by the middle-concentration absorbent flow path L1. An orifice (not shown) for restricting the absorption liquid is provided in the medium-concentration absorption liquid flow path L1.
The medium concentration absorbing liquid is supplied by the pressure difference from the pressure absorbing liquid 2. Thereby, in the low-temperature regenerator 2, the medium-concentration absorbing liquid supplied into the low-temperature regenerator case 20 is reheated by using the outer wall of the refrigerant recovery tank 10 as a heat source. Is separated into the refrigerant vapor and the high-concentration absorbent by the gas-liquid separation section 22, and the high-concentration absorbent is
It is stored in 3.

A low-temperature regenerator case 20 has a vertical cylindrical air-tight evaporation / absorption case 30 disposed concentrically at the lower part thereof, and a condenser case 50 concentrically disposed at the upper part thereof. The low-temperature regenerator case 20 and the evaporating / absorbing case 30 are integrally welded to each other at the bottom plate portions 13 to form the refrigerator main body 101. The low-temperature regenerator case 20 communicates with the inside of the condenser case 50 via the refrigerant vapor outlet 21 and the gap 5A.

The absorber 3 is provided with an absorption coil 31 which is wound in a vertical cylindrical shape inside an evaporating / absorbing case 30 and through which cooling water for exhaust heat flows. A high-concentration absorbent spraying device 32 for dispersing the high-concentration absorbent to the absorption coil 31 is provided. The high-concentration absorbent sprayer 32 is provided with a high-concentration absorbent supplied from an opening of a high-concentration absorbent flow path L2 connected to the high-concentration absorbent reception section 23 of the low-temperature regenerator 2 via the heat exchanger H. In the cooling coil CT during the cooling operation.
The cooling water for exhaust heat cooled in the above is circulated.

In the absorber 3, the high-concentration absorbing liquid flows in from the high-concentration absorbing liquid flow path L2 due to the pressure difference, and the high-concentration absorbing liquid flowing in is absorbed by the high-concentration absorbing liquid spraying device 32 into the absorbing coil 31.
At the upper end of the coil 31 and adheres to the surface of the absorption coil 31 to form a thin film, flows downward by the action of gravity, absorbs water vapor, and becomes a low concentration absorbent. When absorbing the water vapor, heat is generated on the surface of the absorption coil 31, but is cooled by cooling water for exhaust heat circulating through the absorption coil 31. The water vapor absorbed by the high-concentration absorbent is generated as refrigerant vapor in an evaporator 4 described later. The bottom 33 of the absorber 3 is connected to the bottom of the heating tank 11 by a low-concentration absorbent flow path L3 to which a heat exchanger H and an absorbent pump P1 are attached, and the absorber 3 is operated by the operation of the absorbent pump P1. The low-concentration absorbing liquid in the tank is supplied into the heating tank 11.

The evaporator 4 is a vertical type in which cooling / heating water for cooling and heating flows inside the vertical cylindrical partition wall 40 having a communication port provided on the outer circumference of the absorption coil 31 in the evaporation / absorption case 30. A cylindrical evaporating coil 41 is provided, and a refrigerant liquid sprayer 42 is attached above the evaporating coil 41. In addition, the bottom part 43 of the evaporator 4 is provided with a heating absorbing liquid flow path L4 having a heating electromagnetic valve 6.
Communicates with the storage section 121 of the medium-concentration absorbing liquid separation cylinder 12 by means of.

In the evaporator 4, when the refrigerant liquid (water) is dropped on the evaporating coil 41 from the refrigerant liquid dispersing tool 42 during the cooling operation, the dropped refrigerant liquid is subjected to surface tension to the evaporating coil 41.
Of the vaporizing coil 41 in the evaporating / absorbing case 30 at a low pressure (for example, 6.5 mmHg) while evaporating by evaporating and evaporating. The air-conditioning cold / hot water flowing in the coil 41 is cooled.

The condenser 5 is provided with a cooling coil 51 in which cooling water for exhaust heat cooled by the cooling tower CT circulates inside a condenser case 50. The condenser case 50 communicates with the bottom portion 14 of the refrigerant recovery tank 10 through a refrigerant flow path L5. The refrigerant flow path L5 has an orifice (not shown) for restricting the flow rate of the refrigerant from the refrigerant recovery tank 10 to the condenser case 50. None), and the inside of the condenser case 50 communicates with the low-temperature regenerator 2 through the refrigerant vapor outlet 21 and the gap 5A. Is supplied. In the condenser 5, the refrigerant vapor supplied into the condenser case 50 is cooled by the cooling coil 51 and liquefied. The lower part of the condenser 5 and the refrigerant liquid disperser 42 disposed above the evaporator coil 41 of the evaporator 4 communicate with each other through a refrigerant liquid supply path L6. The liquefied refrigerant liquid is supplied to the refrigerant liquid sprayer 42 via the refrigerant cooler 52 provided in the refrigerant liquid supply path L6.

With the above configuration, the absorbent is supplied to the high-temperature regenerator 1 → the medium-concentration absorbent flow path L1 → the low-temperature regenerator 2 → the high-concentration absorbent flow path L2 → the absorber 3 → the absorbent pump P1 → the low-concentration absorbent. The liquid circulates in the order of the liquid flow path L3 and the high temperature regenerator 1. The refrigerant is a high-temperature regenerator 1 (refrigerant vapor) → refrigerant flow path L5 (refrigerant vapor) or a low-temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant supply path L6 (refrigerant liquid) → refrigerant Cooler 52 (refrigerant liquid) → refrigerant liquid sprayer 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3 (absorbent liquid) → absorbent pump P1 → low concentration absorbent liquid flow path L3 → high temperature regenerator Circulate in the order of 1.

The absorption coil 31 of the absorber 3, which exchanges heat with the absorption liquid, and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. The cooling water circulation path is formed by being connected to the CT. In this cooling water circuit, the absorption coil 3
A cooling water pump P2 for sending cooling water into the continuous coil is provided in a cooling water flow path 34 between the inlet of the cooling tower CT and the cooling tower CT.
Is attached, while the outlet of the cooling coil 51 and the cooling tower CT
A liquid / liquid heat exchanger 35 is attached to the cooling water flow path 34 between the cooling water pump P2 and the cooling water passing through the continuous coil by the operation of the cooling water pump P2. The condensed heat is each absorbed to become a relatively high temperature, and a part of the heat is released by the liquid / liquid heat exchanger 35, and then supplied to the cooling tower CT.

With the above configuration, during the cooling operation and the dehumidifying operation described below, the cooling water in the cooling tower CT is operated by the operation of the cooling water pump P2 to cause the cooling tower CT → the cooling water pump P2 →
Absorption coil 31 → Cooling coil 51 → Liquid / liquid heat exchanger 35
→ Circulate in the order of the cooling tower CT. In the cooling tower CT, self-cooling is performed to partially evaporate the falling cooling water into the atmosphere and cool the remaining cooling water.
The cooling water that has released a part of the heat in Step 5 forms a waste heat cycle in which heat is released to the atmosphere and the temperature becomes low. Note that the air from the blower S promotes the evaporation of water.

The evaporator coil 41 of the evaporator 4 includes an indoor unit R
U is connected by a cold / hot water flow path 47 formed of a rubber hose or the like.
7, a cold / hot water pump P3 is provided. With the above configuration, the cold / hot water that has become low in the evaporating coil 41 is
Evaporation coil 41 → cold and hot water channel 47 → air conditioning heat exchanger 44 →
The circulation is performed in the order of the cold / hot water flow path 47 → the cold / hot water pump P3 → the evaporating coil 41.

The indoor unit RU is provided with a dehumidifying operation heat exchanger 61 together with the air conditioning heat exchanger 44.
For these heat exchangers 44 and 61, a blower 46 for passing indoor air in order of the air conditioning heat exchanger 44 → the heat exchanger 61 for dehumidifying operation → the room is provided.

The heat exchanger 61 for dehumidifying operation is provided for performing amenity drying for preventing a decrease in the room temperature during the dehumidifying operation, and is connected to a pipe on the side of the cooling water passage 34 in the liquid / liquid heat exchanger 35. A circulation circuit is formed by the dehumidification operation circuit 60 having pipes provided to face each other. The dehumidifying operation circuit 60 connecting the liquid / liquid heat exchanger 35 and the dehumidifying operation heat exchanger 61 has a hot water circulation pump 62 for circulating hot water and a hot water circulation pump 62 for increasing the temperature of the supplied hot water. A heater 64 having an auxiliary burner 63 is provided.

With the above configuration, during the dehumidification operation, the exhaust heat of the cooling water flow path 34 is transmitted to the dehumidification operation circuit 60 side by the liquid / liquid heat exchanger 35, and the temperature of the hot water is increased by the heater 64. Is supplied to the dehumidifying operation heat exchanger 61, and in the indoor unit RU, the indoor air that has been cooled and dewed by the air conditioning heat exchanger 44 is discharged into the dehumidifying operation heat exchanger 61.
Heated. Thereby, only the indoor air is dehumidified, and the indoor air can be blown into the room again without lowering the temperature.

The absorbing liquid flow path L4 and the heating electromagnetic valve 6 are provided for a heating operation. During the heating operation, the heating electromagnetic valve 6 is opened and the absorbing liquid pump P1 is operated. As a result, the high-temperature medium-concentration absorbing liquid in the medium-concentration absorbing liquid separation cylinder 12 flows from the bottom 43 of the evaporator 4 to the evaporator 4.
The hot and cold water in the evaporating coil 41 is heated by the cold and hot water in the evaporating coil 41.
3, the air-conditioning heat exchanger 44 is transferred from the cold / hot water flow path 47
And heat source for heating. The medium-concentration absorbent in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, and is returned to the heating tank 11 by the absorbent pump P1 via the low-concentration absorbent flow path L3.

As described above, according to the present invention, during the dehumidifying operation, the heat generated in the absorption coil 31 and the cooling coil 51 is transmitted to the liquid / liquid heat exchanger 35 through the cooling water passage 34 as waste heat. In order to use the hot water heated by heat exchange by transferring it to the heat exchanger 61 for the dehumidifying operation of the indoor unit RU by the circuit 60 for the dehumidifying operation, the circuit 60 for the dehumidifying operation is used.
Auxiliary burner 6 serving as a heat source of heater 64 for heating hot water
3 can be suppressed. Therefore, the operating cost in the dehumidifying operation can be suppressed. Further, in the present embodiment, the exhaust heat of the cooling water flow path 34 is transmitted to the dehumidifying operation circuit 60 via the liquid / liquid heat exchanger 35, and the dehumidifying operation circuit for utilizing the exhaust heat of the cooling water flow path 34. Since the cooling water passage 34 forms a completely separate circuit from the cooling water passage 34, dust and dirt that may enter the cooling tower CT provided in the cooling water passage 34 are subjected to the dehumidifying operation circuit 60 and the heat for the dehumidifying operation. There is no mixing into the exchanger 61. Therefore, there is no trouble that the clogging occurs in the dehumidifying operation circuit 60 and the dehumidifying operation heat exchanger 61, and there is no burden of maintenance and maintenance of the dehumidifying operation circuit 60 and the dehumidifying operation heat exchanger 61. Costs can be reduced.

In the above embodiment, the cooling tower CT of the cooling water flow path 34 is of an open type in which a part of the cooling water is evaporated to self-cool the cooling water, but as shown in FIG. The cooling water circulating in the passage 34 may be a water cooling device 70 that forms a closed circuit that is not open to the atmosphere. In FIG. 2, the water cooling device 70 is provided with a water spray tank 72 for heat radiation above a water cooling heat exchanger 71 forming a part of the cooling water flow path 34, and the water cooling heat exchanger 71 is provided with a radiation fin 73. The radiating water discharged from the water spray tank 72 to the water-cooled heat exchanger 71 is received by the water receiving tank 74 installed below the water-cooled heat exchanger 71, and is again returned from the water pumping line 75 provided with the water pump P4 to the water spray tank 72. Pump water to The pumping line 75 is connected to the water source line 76, and when the water level in the water receiving tank 74 falls below a set level by a water level sensor 77 provided in the water receiving tank 74, water is supplied from the water source line 76. Is done. 78 is a blower.

In each of the above embodiments, a burner is shown as a heat source of the heater 64, but another heat source such as an electric heater may be used. Further, the heater 64 need not always be provided. In the above embodiment, the double effect type is described, but a single effect type may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an air conditioner showing another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Absorption refrigeration unit 4 Evaporator 41 Evaporation coil RU Indoor unit 44 Air conditioning heat exchanger 3 Absorber 31 Absorption coil 34 Cooling water flow path (heat exhaust circuit) 35 Liquid / liquid heat exchanger 61 Dehumidifying operation heat exchanger 60 Dehumidification Operation circuit (circulation circuit for dehumidification operation) 64 Heater (heating means)

Claims (2)

[Claims] An air conditioner for circulating cold and hot water for air conditioning passing through an evaporator coil of an evaporator of an absorption refrigerating apparatus having an absorption cycle using an absorbing liquid, to an air conditioning heat exchanger provided in an indoor unit, A liquid-liquid heat exchanger for releasing the exhaust heat of the exhaust heat cooling water is provided to an exhaust heat circuit for radiating the exhaust heat cooling water circulating in the absorption coil of the absorber of the absorption refrigeration apparatus. A dehumidifying operation for circulating hot water for supplying exhaust heat heat exchanged by the liquid / liquid heat exchanger to a dehumidifying operation heat exchanger arranged in parallel with the air conditioning heat exchanger of the indoor unit. Providing a circulation circuit, when performing a dehumidifying operation, in the indoor unit, an absorption refrigeration apparatus characterized by heating the indoor air in the dehumidifying operation heat exchanger after cooling the indoor air in the air conditioning heat exchanger. The air conditioner used. 2. A liquid-liquid heat exchanger, wherein the exhaust heat of the cooling water for exhaust heat is heat-exchanged in the circulation circuit for dehumidifying operation to heat the hot water toward the heat exchanger for dehumidifying operation. The air conditioner using the absorption refrigeration apparatus according to claim 1, further comprising a heating means.