U-type ground heat exchanger heat and moisture transfer performance simulation test device and test method

Abstract

The invention relates to a U-type ground heat exchanger heat and moisture transfer performance simulation test device and test method, which belongs to the technical field of ground-source heat pump air-conditioning. The device comprises a constant temperature water area, a circulating water pump, a sand test bed, a U-type ground heat exchanger, a constant temperature remote boundary simulation system, a groundwater seepage simulation system, a flow meter, a flow control valve, a temperature sensor, a humidity sensor and a data acquisition device. According to the invention, experiments of the influence law of soil type, soil stratification, borehole backfill materials, soil moisture content, soil original temperature, inlet water temperature, fluid flow and the like on the heat transfer performance of the U-type ground heat exchanger can be completed; heat transfer characteristic experiments of the U-type ground heat exchanger under the conditions of groundwater seepage and heat and moisture migration can be carried out; tests of a variety of working conditions can be carried out; and the defect that simply the heat transfer performance of the U-type ground heat exchanger under the condition of a test hole can be acquired through the existing test device, while the influence law of different factors on the heat transfer performance of the U-type ground heat exchanger under different working conditions cannot be acquired is overcome.

Description

technical field [0001] The invention belongs to the technical field of ground source heat pump air conditioning utilization, and relates to a test device and a test method, in particular to a heat transfer performance of a U-shaped buried tube heat exchanger and its surrounding soil heat and moisture transfer characteristics that can be simulated and tested under different conditions devices and testing methods. Background technique [0002] The heat transfer performance of the buried tube heat exchanger is an important factor affecting the energy efficiency of the ground source heat pump system. It has a significant impact on the number and depth of drilling holes, which in turn affects the initial investment of the system. The heat transfer performance between the buried tube heat exchanger and the surrounding soil is related to factors such as soil thermal conductivity, initial soil temperature, soil moisture content, soil type, borehole backfill material, soil heat and m...

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the actual testing method of the heat transfer performance of buried tube heat exchangers, which can only measure the heat transfer performance of U-shaped buried tube heat exchangers under test hole conditions, but cannot obtain different influencing factors under non-test hole conditions. For the influence of U-shaped buried tube heat transfer performance, a simulation test device and test method that can simulate and measure the influence of different factors on the heat and moisture transfer performance of U-shaped buried tube heat exchanger under different working conditions

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