JPH07103515A - Air-conditioner system for building - Google Patents

Abstract

PURPOSE:To set all the appliances which require a maintenance excepting an air- conditioning unit of an air-conditioning system for a building, which naturally circulates a refrigerant by utilizing an absorption-refrigerator as a cold heat source and hot heat source, at one high place of a building such as a roof, etc., by gathering the appliances in the place. CONSTITUTION:On a roof-top of a building, an absorption-refrigerator 1 as a cold heat source for a cooling circuit and a hot heat source for a heating circuit is set, and an air conditioning unit 2 is set at a place which is lower than the roof-top. The cooling circuit is formed by connecting an evaporator 3 of the absorption- refrigerator and a first heat-exchanger 9 in the air conditioning unit by a-refrigerant liquid pipe 11 and refrigerant gas pipe 12. The heating circuit is constituted by connecting a heat-exchanger 14 for heating to which steam generated from a regenerator 5 of the absorption-refrigerator is introduced, and a second heat-exchanger 10 of the air conditioning unit by a hot water outgoing pipe 15 and hot water returning pipe 16. Then, a refrigerant in the cooling circuit naturally circulates, and hot water in the heating circuit is forcibly circulated by a pump which is set at a high place such as the roof-top of the building, etc. By this method, the maintainability of the system is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building air-conditioning system, and in particular, an absorption refrigerator is installed at a high place of a building as a device that also serves as a cold heat source device and a hot heat source device for cooling and heating. Building air-conditioning system in which an air-conditioning unit is installed as a load-side heat exchange device in a building lower than the building, and the absorption chiller and the air-conditioning unit are connected by pipes to form a cooling circuit and a heating circuit Regarding

[0002]

2. Description of the Related Art As a building air conditioning system as described above,
An air conditioning system disclosed in Japanese Patent Laid-Open No. 1-219454 is known. In this air conditioning system, as shown in FIG. 2, an absorption refrigerating machine 31 is installed in a high place such as a rooftop of a building, and an air conditioning unit 32 is installed in each air-conditioned room on each floor in the building. . Then, during the cooling operation, the heat exchanger 39 of the air conditioning unit 32 and the absorption refrigerator 3
1. The refrigerant naturally circulates between the evaporator 33 of No. 1 (in the cooling circuit, the refrigerant in the circuit is radiatively condensed and thus acts as a condenser for the refrigerant in the circuit), and the absorption refrigerator 31 during the heating operation. The refrigerant is forcedly circulated by the pump 47 between the heating evaporator 44 and the heat exchanger 39 of the air conditioning unit 32 which are newly provided therein. In the figure, 35
Is a regenerator of the absorption chiller 31, 36 is a condenser, 34 is an absorber, 37 is a boiler, 51 is a cooling tower, 52 is a receiver for heating operation, and 43 is a receiver for cooling operation. .

[0003]

By the way, in the building air-conditioning system configured as described above, it is necessary to provide the receiver 52 and the pump 47 especially in the lowest part of the heating circuit, for example, in the basement, and the roof or the like. Maintenance management of each device for heating operation including the absorption refrigerator 31 installed at a high place will be performed at the top and bottom of the building, and in this respect, the system is not so preferable configuration. There was something hard to say.

The present invention has been devised in view of the problems of the prior art as described above to effectively solve the problems. Therefore, the purpose is to integrate all of the equipment for heating circuits into the high places of the building in a building air conditioning system that uses an absorption chiller for heating and cooling, especially in a building air conditioning system that naturally circulates a refrigerant during cooling operation. The purpose is to provide a building air conditioning system that can be installed in the building.

[0005]

A building air-conditioning system according to the present invention has the following structure in order to solve the problems of the prior art and achieve the object of the present invention. That is, an absorption refrigerating machine installed in a high place of the building and an air conditioning unit installed in the building lower than the absorption refrigerating machine are provided, and the evaporator of the absorption refrigerating machine and the air conditioner are provided. A heat exchanger for heating, which is connected to the first heat exchanger of the unit with a refrigerant liquid pipe and a refrigerant gas pipe to form a cooling circuit, and uses water vapor evaporated from the regenerator of the absorption refrigerator as a heat source. And a second heat exchanger of the air conditioning unit are connected by a hot water return pipe and a hot water return pipe to form a heating circuit, and a pump for forcibly circulating hot water in the heating circuit is provided at a high place of the building. It is provided.

[0006]

According to the building air-conditioning system of the present invention, in the cooling circuit, the refrigerant that easily evaporates near the normal temperature such as CFC naturally circulates as the heat transfer medium, and in the heating circuit, water functions as the heat transfer medium. It is forced to circulate by the pump.

During the cooling operation, the load heat of the air-conditioned room is absorbed by the first heat exchanger in the air conditioning unit, the refrigerant changes from the liquid phase to the gas phase, and the gas pressure in the refrigerant gas pipe rises to absorb the heat. To the evaporator of the refrigerator (which acts as the condenser of the cold heat source in the cooling circuit). The vapor-phase refrigerant is cooled and condensed in the evaporator of the absorption refrigerator, and descends in the refrigerant liquid pipe by gravity to return to the first heat exchanger of the air conditioning unit. In this way, the refrigerant during cooling operation naturally circulates in the cooling circuit and is used for heat transfer by utilizing its own gas pressure and gravity.

During the heating operation, the steam generated from the regenerator of the absorption refrigerator is introduced into the heating heat exchanger as a heat source. The water circulating in the heating circuit absorbs heat in the heating heat exchanger and radiates heat in the second heat exchanger in the air conditioning unit on the air-conditioned room side.

With the above-mentioned structure, the cold heat source and the hot heat source can be covered by one device called an absorption type refrigerator, and all the other devices including the heat source side device other than the device on the air conditioning load side can be covered. It can be installed in one place at a high place such as a rooftop of a building, and the maintainability of the entire air conditioning system can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIG. The installation position of each component of this system is specified with respect to the height position. An absorption refrigerator 1 is installed as a cold heat source device and a hot heat source device at a high place such as a rooftop of a building. Further, at a location lower than the installation position of the absorption refrigerator 1 such as an air-conditioned room on each floor in the building, the air conditioning units 2 are installed as a load side device in groups.

The absorption refrigerating machine 1 is provided with an evaporator 3, an absorber 4, a regenerator 5 and a condenser 6 as its basic structure. In particular, the regenerator 5 heats an aqueous lithium bromide solution to remove water. To evaporate, a heating source 7 such as a small boiler is provided. Further, the evaporator 3 is provided with a radiator 8 for giving heat of evaporation to evaporate water as a refrigerant liquid.
Is built in. On the other hand, the air conditioning unit 2 contains a first heat exchanger 9 for cooling the air in the air-conditioned room and a second heat exchanger 10 for heating the air during heating.

In the heat transfer system of the present air conditioning system, a refrigerant liquid pipe 11 and a heat radiator 8 incorporated in the evaporator 3 of the absorption refrigerator 1 and the first heat exchanger 9 in the air conditioning unit 2 are provided. The refrigerant gas pipes 12 are connected so as to form a closed circuit to form a cooling circuit. A liquid receiver 13 is provided in the middle of the refrigerant liquid pipe 11. Further, in the absorption refrigerator 1, the water evaporated from the regenerator 5 by the heat of the heating source 7 is introduced to the heating heat exchanger 14. Between the heat exchanger 14 for heating and the second heat exchanger 10 in the air conditioning unit 2, the hot water outward pipe 15 and the hot water return pipe 1 are provided.
The heating circuits are connected by 6 so as to form a closed circuit. A pump 17 is provided in the hot water outward pipe 15 at a high position of the building near the outlet of the heat exchanger 14 for heating. In the air conditioning unit 2, the first heat exchanger 9 has a refrigerant flow rate control valve 18 near the refrigerant inlet, and the second heat exchanger 10 has a hot water flow rate control valve 19 near the hot water inlet. It is provided below the vessel 9 and the second heat exchanger 10.

When the cooling operation is performed in the air conditioning system of the present embodiment having the above-described configuration, in the radiator 8 of the evaporator 3 of the absorption refrigerator 1, the water as the refrigerant of the refrigerator 1 is
The latent heat of vaporization that is lost when vaporized under a low pressure in the evaporator 3 and vaporized is obtained from the refrigerant circulating in the cooling circuit. In the radiator 8, the refrigerant flows in a vapor phase, and by giving latent heat of vaporization to the water refrigerant, it condenses itself and changes to a liquid phase state. From the radiator 8, the liquid-phase refrigerant flows down in the refrigerant liquid pipe 11 by gravity and is temporarily stored in the liquid receiver 13.
It is supplied from the liquid receiver 13 to the first heat exchanger 9 in each air conditioning unit 2. In the first heat exchanger 9, the indoor air having a load in the room to be air-conditioned and the liquid-phase refrigerant exchange heat, and the liquid-phase refrigerant evaporates by removing the load heat from the indoor air. The refrigerant becomes a gas phase and rises in the refrigerant gas pipe 12 by gas pressure, and reaches the radiator 8 of the evaporator 3 in the absorption refrigerator 1. In this way, in the cooling circuit, the refrigerant naturally circulates in the cooling circuit due to gravity and its own gas pressure while being accompanied by a phase change due to heat exchange in the radiator 8 and the first heat exchanger 9. In the flow rate control of the refrigerant, the inflow amount of the liquid phase refrigerant is controlled by the refrigerant flow rate control valve 18 provided below the first heat exchanger 9.

Further, when the heating operation is performed, in the heating heat exchanger 14, the water content of the lithium bromide solution of the absorption refrigerator 1 which has been turned into steam is introduced from the regenerator 5, and the steam and the heating circuit are heated. Heat is exchanged with the hot water circulating inside. That is, the heat exchanger 14 for heating serves as a heat source for warm water to raise the temperature of the warm water. Hot water is pump 1
7 forcibly circulates in the heating circuit. In the figure, 20 is an expansion tank.

With the above-mentioned structure, it is not necessary to provide a receiver in the heating circuit and pumping up the liquid-phase refrigerant, as compared with the prior art in which the refrigerant is naturally circulated in the heating operation. . Then, except for the air conditioning unit 2, all the other devices requiring maintenance can be collectively installed at a high place of a building such as a rooftop, and the maintainability is improved.

[0016]

As is apparent from the above description, according to the present invention, the following excellent effects are exhibited. That is, in a building air-conditioning system that uses an absorption chiller as a cold heat source and a hot heat source at a high place in a building and uses natural circulation of refrigerant, the equipment subject to maintenance management does not include an indoor air-conditioning unit. It becomes possible to install everything else in one place, such as on the rooftop, and improve the maintainability.

[Brief description of drawings]

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

FIG. 2 is a schematic configuration diagram showing a building air-conditioning system in the related art.

[Explanation of symbols]

 1 Absorption Refrigerator 2 Air Conditioning Unit 3 Evaporator 4 Absorber 5 Regenerator 6 Condenser 7 Heat Source 8 Radiator 9 First Heat Exchanger 10 Second Heat Exchanger 11 Refrigerant Liquid Pipe 12 Refrigerant Gas Pipe 13 Recipient 14 Heat Exchanger for Heating 15 Hot Water Forward Pipe 16 Hot Water Return Pipe 17 Pump 18 Refrigerant Flow Control Valve 19 Hot Water Flow Control Valve 20 Expansion Tank

Claims (1)

[Claims] 1. An absorption chiller installed in a high place of a building
(1), and an air conditioning unit (2) installed in the building lower than the absorption refrigerator (1), the evaporator (3) of the absorption refrigerator (1) and the above Air conditioning unit
The regenerator of the absorption refrigerator (1) is formed by connecting the first heat exchanger (9) of (2) with the refrigerant liquid pipe (11) and the refrigerant gas pipe (12) to form a cooling circuit. A heat exchanger for heating (14) using steam evaporating from (5) as a heat source and the air conditioning unit
The heating circuit is formed by connecting the second heat exchanger (10) of (2) with the hot water outflow pipe (15) and the hot water return pipe (16), and at the high place of the building, in the heating circuit. A building air conditioning system characterized in that a pump (17) for forcibly circulating hot water is provided in the building.