Phase change energy storage sleeve-type geothermal heat exchanger

Abstract

The invention relates to a phase change energy storage sleeve-type geothermal heat exchanger and belongs to the technical field of ground source heat pump air conditioners. The phase change energy storage sleeve-type geothermal heat exchanger is constituted by a central pipe, a first sleeve, a second sleeve, a third sleeve, a first annular channel, a second annular channel, a top cover plate, a bottom cover plate, summer and winter working condition phase change materials, a water inlet pipe and a water outlet pipe. The first sleeve, the second sleeve and the third sleeve are placed on the outer side of the central pipe in the radius increasing direction with the central pipe as the circle center. The summer working condition phase change materials are packaged into the central pipe, the winter working condition phase change materials are packaged into an annular closed space defined by the second sleeve and the third sleeve. According to the phase change energy storage sleeve-type geothermal heat exchanger, the defects of large soil temperature fluctuation, wide thermal effect zone and large thermal short-circuiting of the water inlet and outlet pipes during operation of an existing geothermal heat exchanger are overcome, through phase change heat absorption and release of the phase change materials, the heat exchange amount of the geothermal heat exchanger can be increased while thermal short-circuiting of the water inlet and outlet pipes is weakened, the thermal effect degree of the soil temperature is reduced, the thermal interference radius is decreased, and the pipe burying area is decreased, so that the heat exchange efficiency of the heat exchanger is improved.

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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