STUDY ON TEMPERATURE FIELD ROUND VERTICAL BURIED PIPE OF GROUND SOURCE HEAT PUMP IN INTERMITTENT OPERATION

Heat transfer between soil and cooling water in buried pipes is presented, thus ground source heat pump can realize the transfer from low-grade energy to high-grade energy. We tested Water temperature and flow rate of the buried pipe of Ground source heat pump system under intermittent operation condition in Qingdao, temperature field of vertical buried double-U pipes is analyzed by three-dimensional numerical model. Further more, soil temperature round buried pipes is studied by infinite cell, on the basis of heat disturbance radius of buried pipes calculated, economic pipe space was put forward for intermittent operation so that soil occupied area of pipe groups is saved, system coefficient of performance (cop) can be up to higher value, on the other hand, soil temperature can also be recovered efficiently