The Simulation And Optimization Of The Solar-GSHP Coupled System Considering Solar-Energy As The Seasonal Thermal Storage

At present, the heating equipment of some northern towns is small capacity industrial boiler which not only distribute widely but also have highly energy consumption, which is one of the important cause of severe haze weather. Seeking clean way of heating has become the urgent task to resolve environmental pollution pressure. Considering Solar energy and ground source heat pump as renewable energy, with widely distribution and highly energy efficiency,which is good for environment protection,all of it has been widely concerned. Combining the advantages of solar energy and ground source heat pump, the instability of solar energy and ground source heat pump of soil thermal equilibrium problems can be solved. This paper has carried on the coupling connection mode, load distribution, running mode, system optimization and several aspects of research.Firstly, the computation model of building load, running and simulating the system are established by using TRNSYS, exporting hourly load of all the year. The collector area is estimated according to the domestic hot water load and the accumulation of soil heat loss. Combining with the characteristics of the software, the design of the collector area and number of buried pipe drilling process are put forward, which provides reference for later study. The simulation model of indirect-heat-accumulation of the Solar-Ground Coupled Heat Pump System in TRNSYS is setted up.Using heat storage water tank irrigate heat to the soil, the inlet temperature of ground heat exchanger as it irrigating is lower than the tolerable temperature of the PE pipe, which will not result in the PE pipe aged. The accumulated absorption of heat can satisfy the need of heat removal, and the solar collector can undertake most of the domestic hot water load at the same time.Secondly, the simulation model of direct-heat-accumulation of the Solar-Ground Coupled Heat Pump System in TRNSYS is built.With the contrastive analysis of the accumulated absorption of heat and the energy consumption of the system,it can be concluded that the accumulated heat absorption of the former is bigger than the latter, and the system energy consumption of the former is even lower. Meanwhile, the inlet temperature of ground heat exchanger as it irrigating is lower than the tolerable temperature of the PE pipe. Therefore, the direct-system is superior to the indirect-system. The study of the two kinds of heat storage control mode of the system is based on all above, which is groundwater recharging in heating season or all year around. It can be found that the heat accumulated absorption of the groundwater recharging in heating season can satisfy the need of heat removal.The energy consumption of the groundwater recharging in heating season is even lower than the system in all year around. Thus, the system which is running in heating season is superior to the other one.Thirdly, based on the direct-system which irrigates heat to the soil in the heating season, the simulation system of the direct-heat-accumulation of the Solar-GSHP Coupled System is setted up,which considered solar as auxiliary heating in TRNSYS.When the temperature of domestic water tank meet the requirement, the heating plate heat exchanger can be used to assist heat. Compared the total energy consumption with the direct-system, the results show that the energy consumption of the former is lower than the latter, and the payback period is shorter. The system is beneficial for saving energy running which has good popularization value.Eventually, the main parameters of the direct-heat-accumulation of the Solar-GSHP Coupled System that considered solar as auxiliary heating is optimized, which is the slope and azimuth of the collector surface.The collector area and temperature of the domestic water is used to assist heating. The operation energy consumption in one year as objective function, how to use GENOPT optimize the collector inclination and azimuth calculation are all taken into consideration. Secondly, the water tank temperature under different collector area is optimized. Finally, the static payback period method determine the optimum collector area is utilized. Based on all above parameters of the system, the initial investment and operating cost are comprehensive optimal.