Phase change heat storage type ground heat exchanger

Abstract

The invention discloses a phase change heat storage type ground heat exchanger, and belongs to the field of ground-source heat pump air conditioners. The phase change heat storage type ground heat exchanger is composed of one or more phase change heat storage type ground heat exchanging wells, and each phase change heat storage type ground heat exchanging well comprises a water circulation U-shaped pipe, a phase change heat storage pipe, phase change heat storage materials and backfill materials, wherein the water circulation U-shaped pipe is arranged in a drilled well, the at least one phase change heat storage pipe is arranged between a water inlet pipe and a water outlet pipe of the water circulation U-shaped pipe, the phase change heat storage pipe is filled with the phase change heat storage materials, the two ports of the phase change heat storage pipe are closed, and gaps between the drilled well wall and the water circulation U-shaped pipe and between the water circulation U-shaped pipe and the phase change heat storage pipe are filled with the backfill materials. According to the phase change heat storage type ground heat exchanger, the heat storage capacity in the drilled well is improved, the ground heat short circuits are reduced, and therefore the heat exchange performance of the ground heat exchanger is strengthened.

Description

technical field [0001] The invention relates to the field of soil source heat pump air conditioners, in particular to a phase change heat storage type buried tube heat exchanger. Background technique [0002] The soil source heat pump air conditioning system absorbs the cold and heat in the underground soil through the buried pipe heat exchanger to realize building cooling and heating. It is more efficient and energy-saving than conventional air conditioning and heating systems. It is a promising new technology for renewable energy utilization. . [0003] The buried tube heat exchanger is a unique facility of the ground source heat pump system, and it is the most critical part related to the initial investment of the system construction and the overall operating efficiency. The construction cost of the buried tube heat exchanger generally accounts for about 20-30% of the total construction cost of the system, which makes the construction cost of the ground source heat pump ...

AI Technical Summary

Problems solved by technology

[0005] Existing means to improve the thermal performance of underground pipe heat exchangers, such as the above-mentioned patent documents, start from the perspective of enhancing heat transfer and reducing thermal short circuits between circulation pipes, that is, simply enhancing heat transfer in the well without considering the storage capacity in the well. The influence of thermal performance on the thermal performance of heat exchanger, and further take corresponding improvement measures

At the same time, the existing design method of buried pipe heat exchanger treats the heat exchange in the drilling as a steady-state heat exchange, without considering the heat storage in the well

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