Plum-blossom-shaped phase change geothermal energy pile and use method thereof

Abstract

The invention provides a plum-blossom-shaped phase change geothermal energy pile and a use method thereof, and belongs to the field of ground source heat pump air conditioning technologies and energystructures. The energy pile is composed of a reinforced concrete pile body and a plum-blossom-shaped phase change geothermal heat exchanger built in the pile body; the reinforced concrete pile body iscomposed of a reinforcement cage and placed concrete; the plum-blossom-shaped phase change geothermal heat exchanger is composed of a phase change inner tube, an outer tube, a bottom joint and a topjoint; the phase change inner tube is composed of an inner sleeve, an outer sleeve and a composite phase change material; and the composite phase change material is encapsulated between the inner sleeve and the outer sleeve. The plum-blossom-shaped phase change geothermal energy pile provided by the invention solves the defects that the temperature of a traditional U-shaped tube energy pile body is large and the displacement of the pile body is obvious; through the heat absorption and heat release of the phase change material in the plum-blossom-shaped phase change geothermal heat exchanger, thermal interference of inlet and outlet pipes can be reduced, the temperature change amplitude of the energy pile body can be reduced, the thermal strain of the energy pile and the displacement of thepile body can be relieved, and at the same time, the output capability of the geothermal heat exchanger is increased, and the heat exchange performance of the geothermal heat exchanger is improved.

Description

technical field [0001] The invention belongs to the field of ground source heat pumps and energy underground structures, and relates to a phase-change geothermal energy pile and its use method, in particular to a plum-blossom-shaped phase-change geothermal heat exchanger built into a reinforced concrete pile body. Phase change geothermal energy piles and methods of use thereof. Background technique [0002] Ground source heat pump air-conditioning technology has been widely used due to its advantages of high efficiency, energy saving, and environmental protection, but its high drilling cost and large drilling area hinder its further promotion to some extent. The energy pile is a new type of high-efficiency energy underground structure that combines the buried pipe heat exchanger of the ground source heat pump with the building pile foundation and has the dual functions of bearing building loads and heat exchange. It has been gradually popularized and applied in the field of...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a quincunx-shaped phase change geothermal energy for the defects of traditional U-shaped tube energy piles, such as serious thermal short circuit in the inlet and outlet water branch pipes, low heat transfer efficiency, large pile body temperature variation range, and large pile body deformation and displacement range. Pile and its use method, in order to reduce the thermal short circuit of the inlet and outlet pipeline, improve its heat transfer efficiency, reduce the temperature variation range of the pile body, weaken the thermal deformation degree of the pile body, and further improve the structural safety of the energy pile

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