Study On Performance Of Solar-Earth Source Heat Pump System In Dynamic Heating Load

The shortage of energy sources and the environmental pollution have become global problems for all countries.The problem of Chinese environment and energy is faced when bringing sustainable development policy. Efficient use of energy and the developmentand utilization of new energy is useful for solving energy and environment problems. The solar-earth source heat pump system can overcome the intermittent of solar energy and ease the recovery pressure on soil temperature. The system with energy saving advantages has a bright future.In this paper, based on the previous studies, the concept of SESHPS was proposed. Through solar radiation, ground pipe transfer and heat transfer of heat pump system were researched, the system's math model was established. The hourly thermal loads of the simulation building was also calculated. The ground source heat pump experiment on the heating condition was described, the changes of the soil temperature on 24 hours operation and 12 hours of recovery time were researched. The initial soil temperature, the temperature field after 24 hours operation and the soil temperature after 12 hours recovery were compared. The conclusion that the heat pump power consumption increases and the COP decreases with the running time was obtained.In this paper, the application software which was used to study the issue was prepared by VB. The interface of the software was simple and practical, the simulation results were consistent with the experimental data, so the software could be used for the problem.It was focused on the outlet water temperature of the pipe and the collector the imported water temperature of the heat pump,the suction(discharge) heat of the pipe and the collector and the COP change with the running time in the two series operation mode and parallel operation of four split ratio.From the ground temperature recovery and the energy saving point of view,the sunction (discharge) heat of pipe and the COP of the heat pump was compared.The conclusion is that the performance of the joint heating system in all respects has greater advantages. The addition of the dynamic heat load has certain significance to study the problem; Considered from the ground temperature recovery, the system energy-saving and the operation stability, the split ratio S=0.8 of the parallel operation is the best operating mode under the condition of this paper. The bench added solar collector is still under construction, so the comparion of the simulation results and the experimental data isn't carried out.