Refrigeration – Reversible – i.e. – heat pump
Patent
1998-04-22
2000-05-16
Doerrler, William
Refrigeration
Reversible, i.e., heat pump
623244, 62434, F25B 1300, F25D 1702
Patent
active
060620358
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an air conditioner and particularly relates to an air conditioner using secondary refrigerant.
BACKGROUND ART
There is known a conventional air conditioner having two refrigerant circuits, i.e., a primary refrigerant circuit and a secondary refrigerant circuit, as disclosed in Japanese Patent Application Laid-Open Gazette No. 62-238951. The primary refrigerant circuit is configured such that a compressor, a first heat source-side heat exchanger, a pressure reduction mechanism and a first user-side heat exchanger are connected in this order. The secondary refrigerant circuit is configured such that a pump, a second heat source-side heat exchanger and a second user-side heat exchanger are connected in this order.
Heat exchange is made between the first user-side heat exchanger of the primary refrigerant circuit and the second heat source-side heat exchanger of the secondary refrigerant circuit. The second user-side heat exchanger is placed in a room and air-conditions the room.
PROBLEMS THAT THE INVENTION IS TO SOLVE
In the above-mentioned air conditioner, however, it is necessary to provide a pump for transferring refrigerant in the secondary refrigerant circuit. Further, in order to execute both cooling and heating operations, liquid refrigerant and gas refrigerant must be transferred with reliability and therefore it is necessary to provide a pump for liquid and a pump for gas. Furthermore, the pump for gas requires large power and the pump for liquid must be configured such that gas refrigerant cannot flow thereinto.
To cope with the above problems, there is proposed a technique that the secondary refrigerant circuit is formed of a natural circulation type refrigerant circuit. As disclosed in Japanese Patent Application Laid-Open Gazette No. 48-18843, in the natural circulation type refrigerant circuit, a condenser is placed in a higher position while an evaporator is placed in a lower position, and the condenser and the evaporator are connected to each other through a gas pipe and a liquid pipe. Heat exchange is made between the first user-side heat exchanger of the primary refrigerant circuit and the condenser to circulate refrigerant and the room is cooled by the evaporator.
However, the use of the above natural circulation type refrigerant circuit necessitates both of a refrigerant circuit for cooling operation and a refrigerant circuit for heating operation. More specifically, for example, it is necessary that the condenser under cooling operation is placed at a rooftop while the evaporator under heating operation is placed underground and both the condenser and the evaporator are connected to an indoor heat exchanger.
This complicates piping system thereby expending considerable time and effort on installation.
The present invention has been made in view of the above problems and has its object of enabling refrigerant to circulate without the use of a pump for transferring refrigerant and simplifying piping system.
DISCLOSURE OF INVENTION
SUMMARY OF INVENTION
An air conditioner of this invention has, as a heat source, a heat storage circuit or a refrigerating cycle, applies low temparature heat or high temparature hot heat from the heat source to secondary refrigerant in a main refrigerant circuit (20), and gives a moving force to the refrigerant of the main refrigerant circuit (20) by a heating or a cooling operation of a small-sized refrigerating machine (40). Thereby, the room is cooled or heated by a user-side heat exchanger (22) of the main refrigerant circuit (20). Thus, since cooling and heating operations can be executed by the single main refrigerant circuit (20), this provides simplified piping system.
FEATURES OF INVENTION
More specifically, as shown in FIG. 1, a first solution taken in the invention comprises a main refrigerant circuit (20) which is formed in a manner that a heat source-side heat exchanger (21) and a user-side heat exchanger (22) are at least connected through a refrigerant pipe (23) and in which refrigerant is c
REFERENCES:
patent: 4576009 (1986-03-01), Ogushi et al.
patent: 4843832 (1989-07-01), Yamada et al.
patent: 5339893 (1994-08-01), Haynes et al.
patent: 5507158 (1996-04-01), Bernier
Daikin Industries Ltd.
Doerrler William
Studebaker Donald R.
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