Ground source heat pump buried pipe heat exchanger free of backfilling

Abstract

The invention provides a ground source heat pump buried pipe heat exchanger free of backfilling to overcome defects in the prior art. The part below the perennial underground water level is reserved in a buried pipe heat exchanging hole, backfilling of sandy soil backfill materials or other special grouting backfill materials is not needed, in other words, backfilling of the backfill materials does not need to be carried out between a water inlet pipeline and a water outlet pipeline of a buried pipe heat exchanging pipe under the perennial underground water level and between the heat exchanging pipe and the hole wall, the heat exchanging performance of the buried pipe heat exchanger is improved through groundwater runoff water, the number of drill holes is reduced, the construction procedure is simplified, the construction cost is reduced, a large number of backfill materials and cost for backfill grouting and compacting are saved, and the social benefits and the economical benefits are very obvious.

Description

technical field [0001] The invention relates to the field of soil source heat pump air conditioners, in particular to a buried tube heat exchanger for soil source heat pumps. 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 high...

AI Technical Summary

Problems solved by technology

Existing means to improve the thermal performance of buried pipe heat exchangers, such as the above-mentioned patent documents, are all based on optimizing the backfill material and enhancing the compactness of the backfill material. The compactness of the pipe backfill material, even in places with abundant groundwater in the south, when the survey finds that there is underground runoff, the impact of groundwater on the heat exchanger is not considered or rarely considered, and various backfill materials are still used for backfilling, and the same It is required to backfill as densely as possible

[0005] The buried tube heat exchanger is generally composed of a plurality of buried tube heat exchange holes. The buried tube heat exchange tubes are arranged in the buried tube heat exchange holes, and the heat exchange tubes in the buried tube heat exchange holes are connected with each other. The backfill material is filled between the heat pipe and the hole wall. So far, there is no buried pipe heat exchange hole that does not need to be backfilled.

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