Back-filling material for ground-source heat pump ground-burying tube hole drilling

Abstract

The invention discloses a ground source heat pump buried pipe drill hole recharging material, the weight percentage of the recharging material components are as followings: graphite occupies 5 percent to 80 percent, and inorganic particles occupy 20 percent to 95 percent, wherein the inorganic particles are mainly composed of silicate, carbonate, or an inorganic mixture of granular or powdery aluminate. If unprocessed and much impurities composed graphite is adopted, and because the purity of the graphite is only 25 percent, inorganic particles are not need to be added when recharging is performed, and only the unprocessed graphite and water are mixed for recharging directly. The mass ratio of the graphite composed in the interior of the material is no less than 5 percent, thus the heat transfer coefficient K of the recharging material is above 10, the heat transfer coefficient of ground source heat pump buried pipe drill hole recharging material in the prior art is between 1.5 and 3, the heat transfer coefficient of the recharging material of the invention is more than 3 times of the heat transfer coefficient of the recharging material in the prior art, the heat changing efficiency between U-shaped pipe and the surrounding rocks and ground can be improved, thereby, the heat changing efficiency and the energy efficiency ratio of the ground source heat pump are improved.

Description

technical field [0001] The invention relates to an air conditioning device, in particular to a ground-source heat pump ground pipe drilling recharge material. Background technique [0002] A heat pump is a device that extracts heat or cold from soil or rocks. It has the advantages of low energy consumption, high efficiency, and no pollutant discharge. It is one of the cleanest and most economical renewable energy sources today. Therefore, in the increasingly scarce energy Today, ground source heat pump technology has been widely used all over the world. However, the heat exchange efficiency between the U-shaped underground heat exchange tube of the existing ground source heat pump and the surrounding rock and soil is low, which directly affects the working efficiency of the ground source heat pump, and is an important reason why the working efficiency of the ground source heat pump is difficult to improve. . The main reason for the low heat exchange efficiency between the ...

AI Technical Summary

Problems solved by technology

However, the heat exchange efficiency between the U-shaped underground heat exchange tube of the existing ground source heat pump and the surrounding rock and soil is low, which directly affects the working efficiency of the ground source heat pump, and is an important reason why the working efficiency of the ground source heat pump is difficult to improve.

The main reason for the low heat exchange efficiency between the U-shaped tube and the surrounding rock and soil is that the recharge materials between the U-shaped tube and the surrounding rock and soil are mostly composed of quartz sand, cement, fine sand or ordinary soil. The thermal resistance is large and the thermal conductivity is poor

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