Carbon dioxide two-stage cold and heat co-generation system

Abstract

Disclosed is a carbon dioxide two-stage cold and heat co-generation system. The carbon dioxide two-stage cold and heat co-generation system comprises a carbon dioxide subcritical compressor, a carbon dioxide transcritical compressor, a first oil separator, a first condenser, a first expander, a second oil separator, a second condenser, a second expander, a maintaining system, a liquid storage, a first gas and liquid separator and a second gas and liquid separator. The system has the beneficial effects that the unit volume refrigerating capacity is large, and the excellent thermodynamic property is achieved; and a refrigerant R134a in an expander system is a generally-populous medium and low temperature environment-friendly refrigerant at present. The system can recycle all condensate heat, and high-temperature hot water can be produced. Energy lost during pressure reduction by regulating flow is utilized, the back pressure of carbon dioxide is improved, and the efficiency of the whole system is greatly improved. The condensate heat of the expander system of the system is overall utilized, and the superheat degree of returned carbon dioxide is improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration systems, and in particular relates to a carbon dioxide two-stage combined cooling and heating system. Background technique [0002] The purpose of adopting the two-stage form in the traditional refrigeration system is generally to obtain a lower evaporation temperature. A large amount of condensation heat is not effectively used in the cycle process. At the same time, there will be some energy loss during the throttling process, which reduces the efficiency of the entire system. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages and provide a carbon dioxide two-stage combined cooling and heating system. [0004] The technical scheme of the present invention is as follows: the system includes a carbon dioxide subcritical compressor, a carbon dioxide transcritical compressor, a first oil separator, a first condenser, a first expande...

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Problems solved by technology

[0002] The purpose of adopting the two-stage form in the traditional refrigeration system is generally to obtain a lower evaporation temperature. In the cycle process, a large amount of condensation heat is not effectively utilized. At the same time, there will be a part of energy loss during the throttling process, reducing the efficiency of the whole system

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