Analysis In Temperature Field And Thermal Response Around U-Type Vertical Ground Heat Exchanger Of Ground Source Heat Pump

The ground temperature distribution around the U-Type Vertical Heat Exchanger of Ground-source heat pump is the key and premise for optimization and economy of the GSHP. As the pumps run or stop and the time change, the ground temperature distribution trends non-steady characteristic. Through the numerical simulation for U-Type Vertical Heat Exchanger, the ground temperature distribution before and after the pump running is gained. It favors for reasonable designing for burying depths, numbers and the space between two wells, improving economy and capability, and for reducing original investment of the pump system.This paper mainly aims at determining burying pipes depth and wells interval of GSHP in the practical projects. First, according to the detailed analysis and the compares for the two heat transfer model of heat exchanger—analytical model and numerical model , it determines a simple and actual heat transfer model of GSHP from the transfer theory, that is, based on the analytical model to create model and relied on the numerical method to solve the model. Second, as the winter experiment of GSHP it analyses the ground temperature field traits before and after the pump running, gains the feasible buried pipes depth is at least 30m, and calculates the normative heat quantity of unit well depth is 66w/m. Finally, based on the theory of finite cell law, using the software ANSYS, it gains the ground non-steady temperature field in the default time steps. After analyzing, it gets the temperature changes characteristic along the radial, which fits for the experiment analysis basically. At the same time, it deduces the heat radius of the ground pipes is 2m, and ascertains the interval between wells is 4m, which could make design and reference for actually using GSHP systems in Wuhan area.