Rock-soil thermophysical property tester

Abstract

The invention discloses a rock-soil thermophysical property tester, which comprises a heat exchanger, a water inlet pipe, a water outlet pipe, a heater, a centrifugal water pump, a flowmeter, a water inlet pipe thermometer, a water outlet pipe thermometer and a detector. The heat exchanger adopts a sleeve type heat exchanger and consists of an inner pipe and an outer pipe, namely an inner cylinder and an outer cylinder. Theoretically, the rock-soil thermophysical property tester is similar to or even completely meets a physical model presumed by a heat transmission model; the precision of measured rock-soil heat conduction coefficients is effectively improved; furthermore, a plurality of temperature sensors are buried in the ground and are used for monitoring ground temperature gradient in real time; actual temperature of rock-soil can be really reflected; the calculation precision and verification of the heat conduction coefficient can be conveniently improved; the rock-soil thermophysical property tester is compact in structure and portable; on-site running is stable; the test precision meets a standard requirement; the whole test process is automatically executed; and the rock-soil thermophysical property tester is convenient to operate, is stable in performance and is suitable for long-time running test research on a buried heat exchange pipe of a ground source heat pump.

Description

technical field [0001] The invention belongs to the technical field of geothermal testing, and in particular relates to a geothermal physical property tester. Background technique [0002] An important parameter in the design of the ground source heat pump system is the total length of the buried pipe or borehole, which mainly determines the heating (cold) capacity or capacity of the system. Insufficient buried pipes will not guarantee the air conditioning effect, and too many buried pipes will increase the initial investment. The biggest factor affecting the length of the buried pipe is the thermal physical parameters of the rock and soil, that is, the thermal conductivity of the rock and soil. At present, the typical thermal physical property test method in the world is the thermal response method, which is recommended by the standards of the International Ground Source Heat Pump Association (IGSHPA) and the American Society of Heating, Refrigerating and Air-Conditioning ...

AI Technical Summary

Problems solved by technology

Since there are differences in the diameter of U-shaped or double U-shaped pipes and the distance between buried pipes in different designs or constructions, the determination of the equivalent circular pipe radius is also different, making the calculated soil thermal conductivity universal. Not strong

[0008] 2) The structure of the thermal response tester is huge and the operation is complicated

[0009] In order to improve the accuracy, many thermal response test systems in China tend to use two working conditions, cold and hot, which makes the test equipment larger and inconvenient to move; there is also a low degree of system control automation.

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