Refrigeration – Refrigeration producer – Sorbent type
Patent
1997-12-11
1999-08-10
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
62476, F25B 1500
Patent
active
059341017
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a compression/absorption hybrid heat pump and, more particularly, to a compression/absorption hybrid heat pump employing water, ammonia or the like as its refrigerant and a solution, e.g., lithium bromide (LiBr) or water as its absorbent, and comprising an evaporator, an absorber, a solution heat exchanger, a regenerator and a compressor as its major components. This compression/absorption hybrid heat pump is used as a freezing or heating apparatus for air conditioning (cooling/heating) operations and for chemical processes.
BACKGROUND ART
As a working medium for an absorption refrigerating machine, there are not only a combination of water acting as a refrigerant and an aqueous solution of LiBr as an absorbent but also combinations of ammonia and water, HFC22 and E181 and others.
On the other hand, there are also a variety of systems in the compression/absorption hybrid heat pump in which the absorption refrigerating machine is combined with a compressor. The invention relates to a compression/absorption hybrid heat pump in which the refrigerant vapor, as generated by a regenerator, is compressed by a compressor so that the compressed vapor is used as a regenerative heat source for the absorbent solution, and in which the VRC (=Vapor Re-Compression) is applied to the regenerator. Here, this VRC is also called the "MVR (=Mechanical Vapor Re-Compression)".
DISCLOSURE OF INVENTION
The invention relates to a compression/absorption hybrid heat pump in which the VRC is combined with the regeneration process of the absorption refrigerating machine More particularly, a heat source for a regeneration process is prepared by compressing the vapor, which is generated at a regenerating (or condensing) step of a regenerator by a compressor, and by introducing the compressed vapor again into the regenerator to exchange the heat as the reproduction heat source with a weak solution.
This compression/absorption hybrid heat pump has been proposed for a long time. Since the flow rate of the strong solution is lower in the solution heat exchanger than that of the weak solution, the weak solution cannot be sufficiently preheated to make it necessary either to provide an auxiliary preheater or to increase the heating capacity in the regenerator
When the water is employed as the refrigerant whereas LiBr is employed as the absorbent, moreover, the absorption refrigerating machine usually acts under a low pressure so that the water vapor has a low density. In order to combine this the compressor with this, a large-sized compressor is required.
Since the cooling water temperature is limited, moreover, the heat of the absorber is difficult to use for the heating operations so that it can be applied only to a cooling cycle.
Because of these problems, the mere combination of the compression type heat pump with the absorption refrigerating machine of the prior art could not increase the performance coefficient. For the complicated structure, little effect is achieved from the hybrid so that no practiced example has been found.
According to a first feature of the invention, the condensed water, as condensed by applying the VRC to a regeneration process, and the strong solution, as fed out of a regenerator, are employed as a heat source to preheat a weak solution so that the preheating amount of the weak solution is increased to improve the performance coefficient of a refrigerating machine. In the invention, more specifically, not only the strong solution fed out of the regenerator but also the condensed liquid of the vapor used as the heat source in the regenerator is employed as the heat source for preheating the weak solution in the solution heat exchanger. As a result, the preheated temperature of the weak solution is raised to reduce the heating in the auxiliary preheater or the regenerator so that the performance coefficient of the compression/absorption hybrid refrigerating machine is increased.
According to a second feature of the invention, moreover, in order to suppress t
REFERENCES:
patent: 4031712 (1977-06-01), Costello
patent: 4171619 (1979-10-01), Clark
patent: 4586344 (1986-05-01), Lutz et al.
patent: 5038574 (1991-08-01), Osborne
Endou Hajime
Kanetsuki Mitsuaki
Nagashima Yoshinori
Ochikubo Akira
Takaki Tsuneo
Doerrler William
Mitsui Engineering & Shipbuilding Co. Ltd.
The Chugoku Electric Power Co., Inc.
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