TY - JOUR
TI - Enhancement technology of underground water flow field in coal mine to improve energy efficiency of heat pump system in geothermal energy development
AU - Peng Wei
AU - Chen Shuzhao
AU - Lyu Kuan
AU - Xiao Cangyan
AU - Jyu Xingjun
AU - Sun Yuting
AU - Peng Wen
JN - Thermal Science
PY - 2023
VL - 27
IS - 2
SP - 1191
EP - 1198
PT - Article
AB - In order to solve the problem that the cold/heat released from the  underground pipe of coal mine into the soil layer is difficult to dissipate  in a short time, the technology of enhancing the underground flow field of  coal mine in geothermal energy development to improve the energy efficiency  of the heat pump system is proposed. In this paper, based on the ground  source heat pump project located in a coal mine, the energy efficiency  enhancement technology of the artificial flow field ground source heat pump  system is studied and tested. The test results show that when starting work  at about 8:00, due to the increase of heating load, the accumulation of  cooling capacity around the buried pipe increases gradually, and the return  water temperature at the ground source side decreases gradually. At 14:05,  the water was pumped for the operation of the artificial groundwater flow  field. It can be seen that the temperature of the return water at the ground  source side began to rise gradually, indicating that the accumulation of  cold water around the buried pipe was relieved to a certain extent. In  conclusion, the artificial groundwater flow field can alleviate the  accumulation of cold water around the buried pipe heat exchanger to a  certain extent, improve the return water temperature of the buried pipe heat  exchanger, and improve the energy efficiency of the ground source heat pump  system.