Middle-deep buried pipe sand box experiment system for simulating real geological conditions

Abstract

The invention belongs to the related technical field of buried pipe ground source heat pump systems and discloses a middle-deep layer buried pipe sand box experiment system for simulating real geological conditions. The experimental system comprises a sand box, a geological stratification building assembly, a terrestrial heat gradient building assembly, an underground water seepage building assembly and a buried pipe unit, wherein the geological stratification construction assembly is used for simulating soil environments with different depths; the terrestrial heat gradient building assembly is used for simulating different temperatures of geological layers with different depths; the underground water seepage construction assembly permeates water into the sand box to simulate the water seepage condition of a geological layer; a buried pipe of the buried pipe unit is a coaxial sleeve buried pipe, the temperature difference between an inlet and an outlet of the coaxial sleeve buried pipeis measured, and the heat exchange condition of the buried pipe in the sand box is obtained. According to the system, the combined action of three factors of terrestrial heat gradient, underground water seepage and geological stratification is simulated, a single geological condition or multiple geological conditions are created, and a simple and convenient experimental system is provided.

Description

technical field [0001] The invention belongs to the technical field related to buried pipe ground source heat pump systems, and more specifically relates to a medium-deep buried pipe sandbox experiment system that simulates real geological conditions. Background technique [0002] For the buried pipe ground source heat pump system, the most important thing is the buried pipe heat exchanger. Now the mature shallow buried tube heat exchanger technology usually has a drilling depth of about 100 meters, but in practical applications it is often restricted by insufficient land for buried tubes. The new variant of the buried tube heat exchanger, the drilling depth can reach more than 2000 meters. In the engineering practice of exploring middle and deep buried tube heat exchangers, due to the consideration of pipeline strength and construction technology, casing type has become the mainstream buried tube form, instead of U-shaped tubes commonly used in shallow buried tubes. When ...

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Problems solved by technology

[0003] Medium-deep buried pipe heat exchanger is a technical innovation of buried pipe ground source heat pump system. It has the unique advantages of less land occupation and high ground temperature, and is especially suitable for application in cold regions; there are few medium-deep pipe heat exchangers in existing technologies The experimental device for simulating the influence of real geological conditions on the heat transfer of buried pipes in the field of ground source heat pumps considers the combined effects of geothermal gradient, groundwater seepage, and geological stratification. Therefore, it is urgent to develop a new type of sand box experiment system for medium and deep buried pipes.

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