Open type heat pump electricity storage system and method

Abstract

The invention relates to the technical field of energy storage, and provides an open type heat pump power storage system and method. A cold and heat energy heat engine power generation loop; the heat pump refrigerating and heating loop further comprises an air discharging structure suitable for discharging redundant air in the heating loop into the external environment when the heat pump refrigerating and heating loop conducts heating so as to reduce the air pressure in the heating loop. Wherein the heat pump refrigerating and heating loop adopts air as a flowing working medium for heat exchange. According to the open type heat pump electricity storage system, air is adopted as a flowing working medium for heat transfer, and compared with the mode that argon, helium and the like are adopted as the flowing working medium, the cost is lower. Moreover, as the flowing working medium is air, the air quality and pressure in the system can be directly adjusted through the deflation structure communicated with the external environment, a buffer tank is omitted, meanwhile, the requirement of the whole system for leakproofness is lowered, the feasibility of the technology is improved, and the research and development difficulty is lowered.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to an open heat pump power storage system and method. Background technique [0002] At present, argon, helium, etc. are used as the working fluid in the heat pump power storage system of the Brayton cycle that uses the packed bed as the cold storage heat accumulator. In order to prevent the leakage of the gas working fluid, the whole system adopts a closed loop structure. During the storage and discharge process, the temperature change of the gas working medium will cause a large change in the gas density. Therefore, in a large-capacity packed bed with stable pressure and solid volume, the mass of stored gas will change periodically during storage and release. In order to maintain the quality and pressure balance of the working medium in the closed system, it is usually necessary to set up a buffer tank in the system. When the air pressure in the closed system is high, the e...

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Problems solved by technology

[0003] However, such a heat pump power storage system has strict requirements on airtightness, and the cost of using argon, helium, etc. as the working fluid is relatively high

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