Simulation Study On GSHP Coupled Solar Energy Storage And Heating System Driven By Valley Electricity

Firstly,under the background of China's policy of"peak load cutting and valley filling"and electricity"peak-valley time-sharing pricing"and energy demand,phase change materials are used to store energy during the valley period,and heat is released during the peak period of daytime electricity consumption,so as to replace electricity by heat,so as to achieve the purpose of"missing peak"of power grid.Therefore,the research objective of this topic is to build a suitable building intermittent heating system,so as to establish a valley driven GSHP coupled solar energy storage heating system.The effect of phase change heat storage device on heat pump and system performance was studied,and the economy and feasibility of the whole heat storage and heating system were analyzed considering the thermal demand,system efficiency and operating cost of off-peak power.In this paper,an office building in Beijing is taken as the research object,which is simulated by TRNSYS software.The whole heating season is divided into three stages:the initial stage of heating,the middle stage of heating and the final stage of heating,to determine the optimal operation scheme;to study the influence of the use of phase change heat storage device on the operation performance of the system,including comparative analysis of the energy consumption of the system,the heating capacity of the heat pump,the COP of the system,the COP of the heat pump,etc;According to the matching between the thermal storage capacity of the phase change thermal storage device and the thermal load of the building,the energy consumption and operation cost of the three schemes are compared and analyzed,and the optimal thermal storage capacity is selected by using the power consumption in the valley power period,the normal power period and the peak power period.The research of this paper provides theoretical basis and experimental support for the development and application of GSHP coupled solar energy storage heating system driven by GSHP,and provides reference ideas for the research of phase change storage heating field.Through the analysis and comparison,it can be seen that:the first mode is suitable for the initial stage of heating;the second mode is suitable for the middle stage of heating;the first mode is suitable for the final stage of heating.The simulation results show that the COP of the heat pump is reduced by 7%and the COP of the system is increased by 8%;When 15,13 and 11 units are used,the operating costs are 18.70 yuan/m~2,19.65 yuan/m~2and 23.88 yuan/m~2respectively.The investment payback period of valley electric drives GSHP coupling solar thermal storage heating system is 13 years,and that of phase change storage device is 4.5 years.Compared with the non phase change heat storage heating system,The operation cost of valley electric drives GSHP coupling solar thermal storage heating system is 67,400,a 56%reduction.