Heat transfer method for geothermal heat exchangers of pile-buried spiral tube type ground source heat pump system

Abstract

The invention discloses a heat transfer method for geothermal heat exchangers of a pile-buried spiral tube type ground source heat pump system. The heat transfer method comprises the steps of supposing that a heat transfer method for pile-buried spiral tube geothermal heat exchangers adopts a solid cylindrical-face heat source model, wherein the uniform seepage in an infinitely-large porous medium is u, the u is converted into equivalent moving speed U of the medium according to an equation, i.e. U=pwcwu / pc, the initial temperature of the medium is t0, the circle center of an infinitely-long solid cylindrical heat source is located on an axis z; and starting from the time when tau is equal to 0, starting to generate heat in a constant intensity q1(W / m). The mathematical description of the heat transfer method is shown in a drawing. According to the heat transfer method, through providing means that the heat exchange effect of the pile-buried spiral tube geothermal heat exchangers is enhanced by using groundwater seepage and the heat transfer method that the heat exchange of the pile-buried spiral tube geothermal heat exchangers is enhanced by suitably using groundwater, a more accurate basis is provided for engineering design.

Description

technical field [0001] The invention relates to a heat transfer method for a geothermal heat exchanger of a pile-buried spiral tube type ground source heat pump system, and belongs to the field of building environment and equipment engineering, refrigeration engineering technology and related heat transfer. Background technique [0002] The buried pipe ground source heat pump system exchanges heat and cold with the earth through the buried pipe geothermal heat exchanger, which realizes cooling in summer, heating in winter, and can also provide hot water for domestic use. New technology to reduce emissions. However, due to the high initial investment of the ground source heat pump air-conditioning system, its application is limited, and the high cost of drilling construction is the main reason for the high initial investment. In view of the increasing popularity of the use of building pile foundations, the combination of buried pipes and building pile foundations has become ...

AI Technical Summary

Problems solved by technology

Compared with the borehole, the pile foundation has a large volume, and its radial scale and heat capacity cannot be ignored. The heat transfer method for the borehole buried pipe is no longer applicable

In addition, in the existing pile-buried pipe ground source heat pumps, the heat transfer method of the pile-buried pipe geothermal heat exchanger has not been proposed, which will become an important obstacle in the design and application of pile-buried pipes

[0008] In the patent CN200810159583.7, although the composition of the pile-buried spiral tube ground source heat pump system and the solid cylindrical heat transfer method were proposed, the influence of groundwater seepage on the design and operation of the geothermal heat exchanger was not considered in the heat transfer method , it is obvious that there is an error in the influence of groundwater seepage on the temperature distribution under the actual working conditions of the project

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