Optimization And Operation Analysis Of Sewage Source Heat Pump Combined With Solar Heating System

Heating energy consumption accounts for a relatively large proportion of building energy consumption in China.With the intensification of the global energy crisis,finding and utilizing new and clean renewable energy has become an important work for sustainable development.Heat pump has attracted more and more attention because of its energy saving and environmental protection characteristics.Solar energy has become an important research object because of its endless characteristics.Combining the sewage source heat pump system with solar energy to form a composite heating system can increase the heat pump evaporation temperature and heat pump work efficiency,and reduce the operation power consumption.At the same time,it can avoid the problem of large heat collector area and poor stability of the single solar heating.In this paper,a sewage source heat pump project in Harbin is taken as the research background.A solar heating device is added to form a composite heating system.The solar energy collection system is selected and calculated according to the relevant design specifications and manuals.The design form of the composite system is proposed,and the operation mode and control strategy of the composite system are analyzed;a simulation model of a sewage source heat pump combined with a solar heating system is built using TRNSYS as a platform,and the original sewage source heat pump system is used in the past heating season each month's energy consumption data is verified to ensure the accuracy of the simulation using TRNSYS.An extreme cold season and 10 days in the transition season are selected as typical days to simulate the energy consumption and solar energy guarantee rate of the two typical days.The volume of the heat storage tank is changed,and the total energy consumption and the solar heat collection volume of the heat storage tank are simulated,and the best energy saving scheme is selected.To change the process design of the composite system,the composite system was designed according to the design of five kinds of technological conditions within the range of 10% ~ 30% of the solar energy guarantee rate.With the corresponding volume change of the heat storage tank,the best energy saving scheme for each process was simulated.On this basis,the optimal design of the collector dip angles for each of the above five schemes was analyzed,and the economic results of the optimization results were analyzed.The optimal scheme is selected to provide a reference for the rational formulation of the operation strategy of the sewage source heat pump system and the combined solar energy combined heating system.At the same time,the optimal scheme and the original sewage source heat pump system were compared with the traditional coal-fired heating method,and the energy-saving rate was analyzed and related environmental protection analysis was performed.