Application Simulation Study Of Air Source Heat Pump System With Coupling Phase Change Regenerator

The global energy shortage and the severe situation of environmental pollution force all countries to pay attention to the exploitation and effective utilization of energy.China relies heavily on traditional fossil energy and uses coal with high pollution,high consumption and low efficiency.Part of the coal consumption is used in building energy consumption.With the sharp increase of building energy consumption,scholars have begun to explore building energy-saving technologies.Among them,the efficient exploitation and utilization of renewable energy is particularly important.In addition,the contradiction between "abandoning wind" and "abandoning light" has become prominent in recent years.Based on this,an air source heat pump composite heating system coupled with phase change heat accumulator is proposed in this paper.The heating system not only uses renewable energy-air energy,but also uses phase change heat storage technology,which can not only save energy and reduce emission,but also achieve the effects of shifting peaks and filling valleys and relieving the load of power grid.In addition,the use of the system can also produce certain economic benefits.This paper selects an office building in the suburbs of Beijing for modeling.Based on this building foundation,a heating model of air source heat pump composite heating system coupled with phase change heat accumulator is established.According to the established experiment table,the established simulation model is verified,and the maximum relative error is 5.3%,which verifies the accuracy of the model.According to the composite heating system,the heat storage ratio ? is derived,which is defined as the proportion of the phase change heat accumulator to bear the building heat load.Simulate the composite system with different values,and analyze the parameters such as water supply temperature,heating capacity,power consumption,COP,etc.The results show that the water supply temperature of the composite system can basically meet the heating demand.The heating capacity and power consumption increase with the increase of ?.The average COP of the system is 1.6 at the minimum and 2.5 at the maximum.After that,the economic models of independent air source heat pump system,air source heat pump system coupled with phase change heat accumulator,municipal central heating system,electric boiler heating system and coal-fired boiler heating system are established,and the initial investment,annual operation cost and annual cost of each heating mode are compared.The results show that the initial investment of coal-fired boiler heating system is relatively low.The annual operating cost of the composite heating system(? =70%)is relatively low;Apart from the coal-fired boiler heating system,which is neither energy-saving nor environment-friendly,the annual cost of the air-source heat pump composite system(?=60%)coupled with phase change heat accumulator studied in this paper is relatively low,which indicates that the composite system is relatively economical,and the ratio of valley power to electricity is 67.18% under this operation mode,which alleviates the problem of power rejection to some extent and has a good development prospect.Through the simulation of air source heat pump heating system coupled with phase change heat accumulator under different load ratios in Beijing area,the annual cost values of different heating modes are compared and analyzed by using the simulation results,and it is concluded that the economy is best when the heat storage ratio is 60%,which provides a reference basis for the popularization and application of phase change heat accumulator-heat pump system.