Ground heat exchanging system capable of operating all year round

Abstract

The invention belongs to the field of renewable energy sources and phase change thermal energy storage application, and particularly relates to a ground heat exchanging system capable of operating allyear round. The heat exchanging system comprises a U-shaped buried pipe and backfill materials, and the U-shaped buried pipe and the backfill materials are buried in soil; the backfill materials comprise a phase change material A, a phase change material B and a normal backfill material, wherein the phase change temperature of the phase change material A is higher than the temperature of the soilin summer and is lower than the temperature of water at an inlet of the buried pipe during operating in summer; and the phase change temperature of the phase change material B is lower than the phasechange temperature of the phase change material A, lower than the temperature of the soil in winter, and higher than the temperature of the water at the inlet of the buried pipe during operating in winter. According to the ground heat exchanging system capable of operating all year round, composition and proportions of two microcapsule phase change materials are further designed. According to theground heat exchanging system capable of operating all year round, the backfill diameter and pipe burying depth can be effectively reduced, the system operation COP can be improved, integral energy consumption is significantly reduced, and meanwhile, the ground heat exchanging system capable of operating all year round has the characteristics that the structure is compact, the adaptability is high, and the use period is long.

Description

technical field [0001] The invention belongs to the application field of renewable energy and phase change energy storage, and more specifically relates to a buried tube heat exchange system capable of operating throughout the year. Background technique [0002] In recent years, geothermal energy has attracted the attention of many countries as a clean new energy, and has been widely used in geothermal power generation, geothermal heating and other fields. Generally speaking, geothermal energy can be divided into deep geothermal energy and shallow geothermal energy. Among them, shallow geothermal energy is widely used. Shallow geothermal energy is mainly used for heating and cooling in the form of heat pumps. The main heat pump forms are ground water source heat pump system and soil source heat pump system. Compared with the traditional air conditioner, the ground source heat pump adds a buried pipe heat exchange system. Therefore, the buried pipe heat exchange system ha...

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Problems solved by technology

[0004] However, at present, the role of phase change materials in the heat exchange system of buried pipes is only at the stage of theoretical inference and imagination, and there is no specific application practice for which phase change materials to choose, what temperature soils and regions are suitable.

In addition, the application assumptions of phase change materials in ground source heat pump systems in the prior art only consider a single phase change material. The operating characteristics of the heat pump system, while the energy utilization efficiency is low throughout the year; and another factor is that many studies have not considered the "phase separation phenomenon" of phase change materials during use, material stability, durability, and the impact of phase change materials on soil. environmental pollution

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