Compound heat pump system for co-production by adopting trans-critical circle and two-stage absorption type heat pump cycle

Abstract

The invention discloses a compound heat pump system for co-production by adopting trans-critical circle and two-stage absorption type heat pump cycle. The compound heat pump system comprises a trans-critical compression subsystem and a heat pump subsystem which takes the trans-critical compression subsystem as a heat source, wherein the heat pump subsystem comprises first absorption type heat pump subsystems and second absorption type heat pump subsystems which are in energy coupling with the trans-critical compression subsystem. The invention further discloses a co-production method by adopting trans-critical circle and two-stage absorption type heat pump cycle. According to the compound heat pump system, by virtue of reasonable energy coupling of trans-critical cycle and two-stage absorption type cycle, heat energy output of conventional compression cycle is changed; by sufficiently utilizing condensation heat of the trans-critical circle and an extremely low-grade heat source, and the two-stage absorption type heat pump outputs an available conventional heat source, so that the integral performance of the heat pump system is improved; and according to analysis, in comparison with conventional trans-critical heat pump cycle, the heat pump system can increase a heating performance coefficient by more than 40%, has good economical efficiency, and is simple in integral structure.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a compound heat pump system in which a transcritical cycle is co-produced with a two-stage absorption heat pump. Background technique [0002] The transcritical cycle is environmentally friendly because of its working fluid (mostly natural working fluid CO 2 ) has attracted more and more attention in the field of heat pump air conditioning; and its high exhaust temperature can reach 110 °C when the outlet pressure is 10 MPa, the temperature glide is large, and there is a large amount of condensation waste heat available for recycling. In 1999, the CO developed by M.Saikawa and K.Hashimoto 2 A heat pump water heater can provide hot water at 90°C; at the same time, the transcritical heat pump cycle has a high coefficient of performance, CO 2 The COP of the heat pump water heater can reach more than 4.5. [0003] For example, the patent document with publication number CN 1020...

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Problems solved by technology

[0005] For example, the Chinese patent document with application number 201210147756.X discloses a transcritical / absorption composite refrigeration device utilizing low-grade heat. This is a closed transcritical compression-absorption composite system. The high-pressure stage of the system fully utilizes the high temperature of the transcritical cycle. Condensation heat, the low-pressure stage effectively utilizes useless low-grade heat energy, which can greatly improve the efficiency of transcritical refrigeration, but only for refrigeration functions

[0006] Another example is that the Chinese patent document with application number 200910098013.6 discloses a low-grade energy-driven and mechanical work-driven compound heat pump or refrigeration system, which utilizes the high-grade heat in the exhaust gas of the compression cycle, and has a low-grade energy heat pump and refrigeration system. When the energy supply is sufficient, the COP of the system is greatly improved, but the use of heat energy is of high grade, and there are certain limitations

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