A test system and method for soil heat and moisture migration effect during ground source heat pump operation

Abstract

The invention discloses a system and method for testing the soil mass heat and humidity migration effect in the operating process of a ground source heat pump. The system comprises a ground source heat pump testing system and an operation monitoring and data acquisition system. The ground source heat pump testing system is composed of a buried pipe heat exchange system, a heat pump unit, a terminal air conditioning system and an auxiliary system. The operation monitoring and data acquisition system comprises a ground source heat pump operating state monitoring subsystem, a soil mass temperature acquisition subsystem, a soil mass humidity acquisition system, a meteorological data acquisition system and an underground water monitoring subsystem. The invention further provides the method for testing the soil mass heat and humidity migration effect in the operating process of the ground source heat pump. Pressure of all the parts of the system and water flow data in pipes can be accurately acquired in time, and normal operation of the whole test system is guaranteed; various operating state parameters of the ground source heat pump can be accurately calculated, and energy consumption of a whole ground source heat pump system can be evaluated; the soil mass heat and humidity migration effect in the operating process of the ground source heat pump and the influences of the effect on the operating performance of the system can be revealed in all directions.

Description

technical field [0001] The invention belongs to the technical field of environmental geotechnical engineering, and in particular relates to a test system and method for the heat and moisture migration effect of soil during the operation of a ground source heat pump. Background technique [0002] Ground-source heat pump (Ground-Source Heat Pump, referred to as GSHP) technology through the circulation of liquid (usually water) in the buried pipe to exchange heat with the shallow rock and soil on the surface, so that the low-grade heat energy of the rock and soil that cannot be directly used can be converted into usable heat. The high-grade thermal energy utilized is one of the most widely used technologies in mining shallow ground energy. Its working principle is: the temperature of the rock-soil layer below the depth of 10m on the surface is not affected by the external climate, and can basically remain stable throughout the year; using this characteristic of the rock-soil la...

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Problems solved by technology

At the same time, in the operation of the ground source heat pump, in addition to the influence of heat exchange, environmental factors such as groundwater seepage, rainfall, and evaporation will also significantly affect the heat and moisture transfer process of the soil, which will ultimately affect the operating characteristics of the ground source heat pump system.

At present, the existing research results are all focused on the change of soil temperature around the buried pipe, and there is no report on the change law of its humidity field, let alone consider the effect of groundwater seepage, rainfall, evaporation and other environmental factors on soil heat and moisture transfer. Impact

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