Heat insulation device for U-shaped pipe laying heat exchanger

Abstract

The invention relates to a heat insulation device for a U-shaped pipe laying heat exchanger, which is arranged between straight tube sections of the U-shaped heat exchange pipes of the heat exchanger.The heat insulation device comprises a body, wherein an arc groove attached to the straight pipe sections of the U-shaped heat exchange pipe of the heat exchanger is axially arranged on the externalwall of the body; and the body is made of a material with the coefficient of heat conductivity of between 0.02-0.06W / (m-K). Compared with the prior art, the heat insulation device has the advantages that the heat interference phenomenon generated among the straight pipe sections of the U-shaped heat exchange pipe can be avoided through setting the heat insulation device with the coefficient of heat conductivity of between 0.02-0.06W / (m-K) among the straight pipe sections of the U-shaped heat exchange pipe of the heat exchanger, on the premise that the effective heat exchange area of the U-shaped pipe is not reduced, through ensuring the distance between two pipes of the U-shaped pipe and applying a high thermoresistance recharge material, the amount of heat exchange of the U-shaped pipe isimproved by about 15 percent.

Description

technical field [0001] The invention relates to a heat insulation device for a U-shaped buried tube heat exchanger. Background technique [0002] At present, the ground source (soil source) heat pump system used in our country adopts the mode of heat exchange between the medium flowing through the buried pipe and the earth (soil, stratum, groundwater). This heat exchanger is available in both vertical and horizontal borehole types. Technically horizontal and vertical buried pipe systems are basically the same. The horizontal buried pipe is buried in shallow soil, and the setting is relatively simple. However, it occupies a large area, and the geothermal heat exchanger with horizontally buried pipes is affected by surface climate changes, and its efficiency is low. Therefore, the application of the ground source heat pump air-conditioning system of the horizontal buried pipe type is restricted to a certain extent in the case of a large number of people and a small amount o...

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Problems solved by technology

For this reason, in order to increase the heat transfer between the U-shaped pipe and the soil, it is necessary to use a recharge material with a thermal conductivity greater than that of the soil (generally, the thermal conductivity of the soil is between 0.8 and 1.6W / (m·K), and the recharge material The thermal conductivity should be greater than 1.8W / (m K)), and the larger the better within a certain range; in this way, the thermal short circuit loss between the two tubes will inevitably increase accordingly

Therefore, the above characteristics affect the use of refilling grouting materials to a certain extent, and directly lead to an increase in the number of U-shaped pipes and an increase in project cost

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