A phase change energy storage casing type geothermal heat exchanger

Abstract

A phase-change energy storage casing type geothermal heat exchanger, which belongs to the technical field of ground source heat pump air conditioning, consists of a central pipe, a first casing, a second casing, a third casing, a first annular channel, and a second annular channel , top cover plate, bottom cover plate, phase change material for summer and winter working conditions, water inlet pipe and water outlet pipe. The first bushing, the second bushing and the third bushing take the center pipe as a circle center and are placed outside the center pipe along the direction of increasing radius. The phase change materials under the summer working condition and the winter working condition are respectively packaged in the central tube and the annular closed space surrounded by the second sleeve and the third sleeve. The invention solves the defects of large soil temperature fluctuations, far heat-affected areas, and large thermal short circuit of the water inlet and outlet pipes during the operation of the existing geothermal heat exchanger, and can weaken the thermal short circuit of the water inlet and outlet pipes through the phase change heat absorption and heat release of the phase change material. , Alleviate the degree of thermal influence of soil temperature, reduce the radius of thermal interference, shorten the area of ​​buried pipes, and at the same time increase the heat transfer capacity of the geothermal heat exchanger, thereby improving its heat transfer efficiency.

Description

technical field [0001] The invention belongs to the technical field of ground source heat pump air conditioning utilization, and relates to a phase-change energy storage casing type geothermal heat exchanger, in particular to a casing that encapsulates two phase-change materials with different melting point temperature ranges The phase change energy storage casing type geothermal heat exchanger. Background technique [0002] As an energy-saving and environmentally friendly renewable energy utilization technology, ground source heat pump is considered to be one of the most promising heating and air-conditioning technologies. As the only device for ground source heat pump to exchange heat with soil, the geothermal heat exchanger's energy storage and heat transfer performance and the resulting thermal response characteristics to the surrounding soil temperature are very important for the long-term efficient and stable operation of the ground source heat pump system. The heat t...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a phase-change energy storage casing type geothermal heat exchanger for the defects of the current traditional geothermal heat exchanger, such as large thermal influence radius, large floor space, serious thermal short circuit of the inlet and outlet pipelines, and low heat exchange efficiency. It is a phase-change energy storage sleeve-type geothermal heat exchanger that can not only reduce the thermal short circuit of the inlet and outlet pipelines, shorten the heat influence radius, save floor space, but also improve its energy storage and heat transfer performance.

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