JPH05312351A - Air-conditioning system - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of a absorption type refrigerating machine by cooling the cleaning coil of an outer air-conditioning machine by a heat pump. CONSTITUTION:Cold water, coming from a main supply tube 15 which supplies the cold water from an absorption type refrigerating machine 11 into a main air-conditioning machine 13, passes through a first pipeline 45 to enter the evaporator 21 of an outer air-conditioning machine 27 and is cooled by heat exchange, then, enters a cleaning coil 35 through a second pipeline 47. Then, heat exchange is effected in the cleaning coil 35 and, thereafter, is circulated again into the main supply tube 15 through a third pipeline 149. On the other hand, hot-water, coming from a main returning pipe 17, connecting the main air-conditioning machine 13 to the absorption type refrigerating machine 11, enters the condenser 25 of the outer air-conditioning machine 27 and is heated, then, enters a heating coil 33 through a fifth pipeline 53. Thereafter, heat exchange is effected in the returning pipeline 17 through a sixth pipeline 55. According to this method, the operating efficiency of the absorption type refrigerating machine 11 is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system using an absorption refrigerator as a main heat source.

[0002]

2. Description of the Related Art Conventionally, in a large-scale air conditioning system, it is known that an absorption chiller that does not use a specific chlorofluorocarbon is used as a heat source.

On the other hand, in a heat source system such as a clean room or a computer room, the main cooling load processing is, for example, 1
In many cases, medium-temperature cold water of about 0 to 15 ° C is sufficient, but conventionally, for example, production of low-temperature cold water of about 5 to 6 ° C has been required.

Therefore, in an air conditioning system having a clean room, a computer room, etc., it is required for an absorption refrigerator to produce low temperature cold water of about 5 to 6 ° C.

[0005]

However, in such a conventional air conditioning system, the absorption refrigerator has a temperature of 5 to 6 ° C.
There is a problem that the operation of the absorption chiller becomes very inefficient because it is required to produce low temperature cold water of a certain degree.

[0006] In general, the absorption type refrigerator has lower followability and stability to abrupt load changes as compared with a heat pump and the like, and therefore, a space requiring high reliability such as a clean room of a semiconductor factory. There was a problem that it was difficult to use for air conditioning.

The present invention solves the above problems and improves the operating efficiency of an absorption chiller and can sufficiently cope with a sudden load change. The purpose is to provide.

[0008]

The air conditioning system of the present invention includes an absorption refrigerator connected to a main air conditioner via a main supply line and a main return line, an evaporator, a compressor and a condenser. A heat pump having, an external conditioner having a heating coil and a cooling coil, a first conduit connecting the main supply conduit with an inlet side of the evaporator, an outlet side of the evaporator and an inlet of the cooling coil. Second connecting side
A conduit, a third conduit connecting the outlet side of the cooling coil and the main return conduit, a fourth conduit connecting the main return conduit and the inlet side of the condenser, and the condenser And a sixth conduit connecting the outlet side of the heating coil and the inlet side of the heating coil, and a sixth conduit connecting the outlet side of the heating coil and the main return conduit.

[0009]

In the air conditioning system of the present invention, the chilled water from the main supply line flows into the evaporator through the first line and is cooled.
It flows into the cooling coil through the second pipe, exchanges heat with the cooling coil, and then is returned to the main supply pipe through the third pipe.

Further, the hot water from the main return line flows into the condenser through the fourth line, is heated, and then flows into the heating coil through the fifth line. After exchanging heat with, it is returned to the main return line through the sixth line.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of an air conditioning system of the present invention. Reference numeral 11 indicates a main air supply line 1 to a main supply line 1
5 shows an absorption chiller connected via 5 and the main return line 17.

Reference numeral 19 indicates a heat pump,
The heat pump 19 has an evaporator 21, a compressor 23 and a condenser 25. In this embodiment, a chiller is housed in the evaporator 21 and the condenser 25.

Reference numeral 27 indicates an external air conditioner. The external air conditioner 27 includes filters 29, 31, a first heating coil 33, a cooling coil 35, a second heating coil 37, in this order from the intake side. Humidifier 39 and blower 4
1 is arranged.

The heat pump 19 and the external regulator 27 constitute a local unit 43 for individually air-conditioning, for example, a clean room, a computer room or the like. Although a plurality of local units 43 are formed for one absorption refrigerator 11, only one is shown in FIG. 1.

The main supply line 15 and the inlet side of the evaporator 21 are connected by a first line 45. The outlet side of the evaporator 21 and the inlet side of the cooling coil 35 are connected by a second pipe line 47.

The outlet side of the cooling coil 35 and the main return conduit 17 are connected by a third conduit 49. The main return line 17 and the inlet side of the condenser 25 are connected by a fourth line 51.

The outlet side of the condenser 25 and the inlet side of the first heating coil 33 are connected by a fifth conduit 53. The outlet side of the first heating coil 33 and the main return conduit 17 are connected by a sixth conduit 55.

A seventh pipe line 57 branched from the fifth pipe line 53 is connected to the inlet side of the second heating coil 37. An eighth pipe line 59 branched from the sixth pipe line 55 is connected to the outlet side of the second heating coil 37.

First conduit 45, third conduit 49, fourth conduit 5
The on-off valves 61, 62, 63, 64 are arranged outside the local unit 43 of the first and sixth pipelines 55, and the flow rate is set inside the local unit 43 of the first pipeline 45 and the fourth pipeline 51. Adjustment valves 66 and 67 are arranged.

Flow rate adjusting valves 71, 72, 73 are arranged in the second conduit 47, the fifth conduit 53 and the seventh conduit 57. The pump 7 is installed in the first conduit 45 and the fourth conduit 51.
5, 76 and check valves 78, 79 are arranged.

The second conduit 47, the third conduit 49, and the fifth conduit
The pipeline 53 and the sixth pipeline 55 are bypass pipelines 81 and 82.
The flow rate adjusting valves 84 and 85 are arranged in the bypass pipelines 81 and 82, respectively.

In the air-conditioning system configured as described above, for example, in summer, dehumidification is necessary in a clean room or the like, and therefore, as shown in FIG. Flows into the evaporator 21 through the first conduit 45, is cooled to, for example, 5 ° C., and then flows into the cooling coil 35 through the second conduit 47. After exchanging and dehumidifying the intake air, it is returned to the main supply line 15 through the third line 49.

On the other hand, from the main return line 17, for example, 2
The return cold water of 0 ° C. flows into the condenser 25 through the fourth pipe line 51, is heated to, for example, 25 ° C., and then passes through the fifth pipe line 53 and the seventh pipe line 57 to reach the second heater. Ting coil 3
7, the second heating coil 37 exchanges heat with the low-temperature intake air dehumidified by the cooling coil 35, and the temperature of the intake air is increased by 2 to 3 ° C., and then the eighth pipe line 59 and the sixth pipe line. Is returned to the main return line 17 through 55,
The excess heat is cooled by the absorption refrigerator 11.

The intake air heated in the external air conditioner 27 after dehumidification is blown into the clean room by the blower 41. On the other hand, for example, in winter, it is basically the same as in the summer cycle, but since dehumidification is not necessary and heating is necessary, as shown in FIG. Returned cold water passes through the fourth conduit 51 and the condenser 2
5 and is heated to, for example, 25 ° C., then flows into the first and second heating coils 33 and 37 through the fifth pipe 53 and the seventh pipe 57, and then flows into the first and second heating coils 33 and 37. After heat exchange with the intake air by the two heating coils 33 and 37 to raise the temperature of the intake air and spend most of it for heating, the main return pipe line 17 passes through the sixth pipe line 55 and the eighth pipe line 59. Is returned to.

At this time, cold water of, for example, 10 ° C. from the main supply line 15 is discharged by the chiller in the evaporator 21.
For example, after being cooled to 5 ° C., it is returned to the main supply pipe 15 through the second pipe 47 and the bypass valve 84, and this cold water is
It is used for cooling the supply air in the other main air conditioner 13.

That is, the chiller housed in the evaporator 21 and the condenser 25 simultaneously performs cold water production and hot water production, and each is effectively consumed by the air conditioner. In addition,
In the external air conditioner 27, the heated intake air is supplied to the humidifier 39.
After being humidified by, the air is blown into the clean room by the blower 41.

In FIGS. 2 and 3, the black open / close valve and the flow rate adjusting valve are in the closed state, and the white open / close valve and the flow rate adjusting valve are in the open state. In the air conditioning system described above, the heat pump 19 cools the cooling coil 35 of the external conditioner 27, so that it is not necessary to produce low-temperature cold water of, for example, about 6 ° C. by the absorption refrigerator 11, and absorption The operating efficiency of the refrigerator 10 can be improved.

That is, in such an air conditioning system,
Generally, the motive power of the heat pump 19 is the absorption refrigerator 1.
The load is increased to 1, which leads to an increase in the capacity of the absorption refrigerator 11 and an increase in running. In this embodiment, the temperature of the cold water taken out from the absorption refrigerator 11 can be set to about 10 ° C. The operating efficiency of the refrigerator 11 can be improved.

When the temperature of the cold water taken out from the absorption refrigerator 11 is 10 ° C., the processing capacity of the absorption refrigerator 11 is increased by 30% and the running cost is reduced by 17% as compared with the case of 6 ° C. To do.

When the above-mentioned air conditioning system is installed in a general semiconductor factory, cold water supply of 10 ° C. and 5 ° C.
Chilled water supply ratio is 6 to 4 in the most unfavorable situation
In this case, the processing capacity of the absorption refrigerator 11 is reduced by 20% and the running cost is reduced by 17%.

Further, by the heat pump 19, the external conditioner 2
Since the load of No. 7 is followed, it is possible to sufficiently cope with a sudden load change of the external conditioner 27, and it is possible to eliminate the poor followability of the absorption refrigerator 11.

Further, since the absorption refrigerator 11 does not need to use a specific chlorofluorocarbon, the risk of polluting the environment is reduced. Further, in the heat pump 19, the hot water from the main return line 17 flowing into the condenser 25 can be heated by the refrigerant that has been heated by the heat exchange with the cold water from the main supply line 15 in the evaporator 21. The operation efficiency of the heat pump 19 can be improved.

[0033]

As described above, in the air conditioning system of the present invention, the cooling coil of the external conditioner is cooled by the heat pump, so that it is not necessary to produce low-temperature cold water by the absorption refrigerator, and the absorption refrigeration system is not required. The operating efficiency of the machine can be improved.

Further, there is an advantage that the heat pump can sufficiently cope with a sudden load change of the external air conditioner.

[Brief description of drawings]

FIG. 1 is a piping system diagram showing an embodiment of an air conditioning system of the present invention.

FIG. 2 is a piping system diagram showing an example of a summer state of the air conditioning system of FIG.

FIG. 3 is a piping system diagram showing an example of a winter state of the air conditioning system of FIG.

[Explanation of symbols]

 11 Absorption Refrigerator 13 Main Air Conditioner 15 Main Supply Pipeline 17 Main Return Pipeline 19 Heat Pump 21 Evaporator 23 Compressor 25 Condenser 27 External Conditioner 33 First Heating Coil 35 Cooling Coil 37 Second Heating Coil 45 1st pipeline 47 2nd pipeline 49 3rd pipeline 51 4th pipeline 53 5th pipeline 55 6th pipeline

Claims (1)

[Claims] 1. An absorption chiller connected to a main air conditioner via a main supply line and a main return line, a heat pump having an evaporator, a compressor and a condenser, a heating coil and a cooling coil. An external air conditioner, a first pipeline connecting the main supply pipeline and the inlet side of the evaporator, a second pipeline connecting the outlet side of the evaporator and the inlet side of the cooling coil, A third conduit connecting the outlet side of the cooling coil and the main return conduit, a fourth conduit connecting the main return conduit and the inlet side of the condenser, the outlet side of the condenser and the An air conditioning system comprising: a fifth conduit connecting the inlet side of the heating coil; and a sixth conduit connecting the outlet side of the heating coil and the main return conduit.