The Alternate Operation Characteristics of a Solar-ground Source Heat Pump System

摘要

In order to overcome the disadvantages of ground coupled heat pump (GCHP) operated in heating-dominated district, solar energy is selected as a supplement heat source of GCHP and compose a solar-ground source heat pump system(SGSHPS). Alternate operation modes, which alternately utilize the solar energy or geothermal energy as the heat source of heat pump, are put forward for improving the operation performance of GCHP. A two-dimensional mathematical model with phase change was developed to investigate the alternate operation characteristics of the SGSHPS. Based on the numerical solution of the model, the soil temperature variations trend operated in various alternate modes were discussed. The validation on the model was done by the experimental data and the results indicate that the calculated soil temperatures in given place by the model are agreed well with the test data. The conclusions obtained in the paper can provide a preference for the optimization operation of SGSHPS.