Research Of Long Period Operation Characteristics Of Ground Coupled Heat Pump Systems

This dissertation, based on existing studies, established a new mathematical model of underground pipe heat exchanger. Discreted the mathematical model by using the central difference method, obtained the simulation results by using Matlab.Use the similarity theory to reduce the actual heat exchanger.At the same time, simulation time is double shortened. Build a model test bed to simulate the heat pump unit's operation, under the intermittent operation.In the experiment, use the chiller and the heater to control the hot and cold water tanks, use a total console to control the temperature of heating or cooling, collect and save the experimental data by the data collection instrument and the host. Compared the experimental data and simulation results, analyse the deviation.In this paper, use the software Dest to calculate the year's dynamic load of the same construction model in Beijing, Shanghai and Harbin. Simulate the operation of the under ground heat exchanger pipe with this mathematical model in these three regions. Calculate the temperature changes of the heat exchanger and soil around under different conditions.This dissertation aims to obtain the use of the technology of the ground.coupled heat pump based on the model test and the research of long.period operation in various regions of China. Then according to the distribution of the annual construction load in different designs, proposed design methods and optimization techniques of the ground.coupled heat pump system in non.optimal applicable areas. Provide a theoretical basis and technical support for the scientific promotion and application in all regions of our country.