Research On Micro-distributed Energy System Based On Solar Energy And Air Source Heat Pump

With the shortage of energy and the increasingly severe forms of environmental pollution,it is necessary to adjust the existing energy structure and explore clean and efficient energy supply methods.Distributed energy systems can make full use of energy sources such as gas,solar or wind energy,while providing users with cold,heat and electric loads,with high energy efficiency and low pollutant emission rate,and gradually become an important direction for future energy development.This paper studies the micro-distributed energy system based on solar energy utilization and supplemented by air source heat pump,aiming to provide some new directions and ideas for the energy supply of urban residents.The main research contents of this paper are as follows:?1?This paper introduces the current and mature PV cells,the small and medium-sized solar photovoltaic power generation systems with independent power supply and grid-connected operation modes are compared.The stability and efficiency of the schedulable grid-connected photovoltaic power generation system are affirmed.?2?Taking the single-family house of a social welfare institution in Xuzhou as the research object,the building model is built by using the building energy simulation software DeST,and the detailed cold,heat and electric load are obtained through simulation calculation.The urban residential building load is small but fluctuating,based on the characteristics of residential building load and the type of building,this paper builds a micro-distributed energy system with complementary solar and air source heat pumps:The copper indium gallium selenide thin film photovoltaic cell substrate is used in the balcony glass to provide electric load to the user through the schedulable grid-connected solar photovoltaic power generation system,and the insufficient electrical load is provided by the power grid.The solar-powered VM circulating heat pump provides heating and cooling loads,and the insufficient load is supplemented by an air source heat pump;The solar collector is coupled to the VM circulating heat pump,and the domestic hot water load is provided by the solar collector.?3?In the application research of micro-distributed energy system,this paper explores the cascade utilization of solar energy.In view of the serious pollution of urban heating season smog,combined with the solar collector tube in the system,the solar fresh air system suitable for residential buildings is designed to make full use of solar energy and reduce the electric load of fresh air system.The solar fresh air system is mainly composed of a solar collector,a heat storage box and an air purification system.According to the actual use,this paper separately carrie s out two parts experiments of air purification system and fresh air heating system.In the air purification system experiment,after the air in the laboratory room is cleaned by the reservoir,the PM2.5 decreases by 60,125 and 159 after four hours without passing through the air filter sponge and passing the 5mm or 10mm thick filter sponge,the relative humidity increased by 7.7%,4.9%and 2.2%respectively at the same time.In the experiment of fresh air heating system,after heating the fresh air with the solar heat storage box,the room temperature of the experimental room is always higher than about 2°C of the comparison room.Experiments show that the designed solar fresh air system has good air purification effect and fresh air heating effect.?4?This paper analyzes the energy consumption,environmental protection and economy of the built micro-distributed energy system.In terms of energy efficiency,the system's primary energy utilization rate is 36.38%.Compared with the traditional energy system,it saves 3.98 tons of standard coal and the primary energy saving rate reaches 90.40%.In terms of environmental benefits,compared with traditional energy systems,annual emission reductions of CO₂,NOx and SO₂ are10.51t,22.09kg and 13.21kg respectively,and the emission reduction rates have reached 91.53%,95.46%and 73.54%respectively.In terms of economic benefits,the initial investment in micro-distributed energy system is more than that of traditional energy systems,but micro-distributed energy system has lower annualized cost.The system's investment payback period is 9.6 years,micro-distributed energy system is economically feasible.