Low-temperature phase-change heat accumulator

Abstract

The invention provides a low-temperature phase-change heat accumulator which comprises a tank body and a snakelike metal pipe row. The snakelike metal pipe row is arranged in the tank body, metal fins are arranged on the snakelike metal pipe row in a sleeved mode at intervals, the snakelike metal pipe row comprises heat accumulation pipe row bodies and heat releasing pipe row bodies, the heat accumulation pipe row bodies and the heat releasing pipe row bodies are alternatively arranged, the heat accumulation pipe row bodies are connected with a heat accumulation refrigerant loop of a heat accumulation evaporation type air source heat pump through liquid inlet pipes and liquid outlet pipes of the heat accumulation pipe row bodies, the heat releasing pipe row bodies are connected with a heat releasing refrigerant loop of the heat accumulation evaporation type air source heat pump through liquid inlet pipes and liquid outlet pipes of the heat releasing pipe row bodies, the positions between the heat accumulation pipe row bodies and the liquid inlet pipes of the heat releasing pipe row bodies and between the heat accumulation pipe row bodies and the liquid outlet pipes of the heat releasing pipe row bodies are respectively provided with a heat accumulation header, the positions between the heat releasing pipe row bodies and the liquid inlet pipes of the heat releasing pipe row bodies and between the heat releasing pipe row bodies and the liquid outlet pipes of the heat releasing pipe row bodies are respectively provided with a heat releasing header, heat preservation materials are arranged in an interlayer of the tank body, and the interior of the tank body is filled with composite phase-change heat accumulation materials. The low-temperature phase-change heat accumulator is mainly used in an air source heat pump unit technological process, can serve as a heat accumulator or a subcooler or an auxiliary evaporator, and can carry out heat accumulation and heat releasing at the same time. The heat supply coefficients of a heat pump unit can be improved, and the operation performance of the air source heat pump unit in a low-temperature environment is remarkably improved.

Description

technical field [0001] The invention relates to an energy storage and release device, in particular to a low-temperature phase-change heat accumulator with a double serpentine-fin tube row structure. Background technique [0002] Phase change heat storage is to store or release heat by absorbing or releasing heat energy when the phase change material undergoes a phase change. It has many advantages such as large heat storage per unit volume, small temperature fluctuation, and good safety. There are many research results on phase change heat storage materials, but the main problem is that the stability of the materials is average, and the heat storage capacity will decline to varying degrees after repeated heat storage and discharge. Common phase change heat storage materials include paraffin, sulfate, nitrate, and fluoride. The phase change thermal storage and cold storage heat exchangers currently studied are mainly composed of plate type phase change heat exchangers, rib ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a low-temperature phase-change heat accumulator, which mainly solves the technical problems of poor operating performance of an air source heat pump in a low-temperature environment, low heat storage capacity of the phase-change heat accumulator, and slow heat storage and discharge speed.

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