Research And Improvement Of Solar Energy Coupled CCHP System

Combined cooling,heating and power system has many advantages such as energy saving,environmental protection and economy,and with the deepening of research,the configuration of solar energy and traditional combined cooling,heating and power system has attracted much attention because of its better performance.However,the problems of solar coupled co-generation system such as unreasonable configuration strategy,improper operation mode,and high energy dependence hinder the further research and development of the system.In view of the problem that the diversity of solar energy utilization methods leads to the unreasonable configuration strategy of solar coupled cogeneration system,this paper couples the solar photovoltaic system,solar thermal system and solar photovoltaic solar thermal system with the cogeneration system,and proposes three improved configuration schemes on the basis of the traditional configuration method.In order to compare the performance of different types of solar coupled power supply systems,this paper takes office buildings in a certain area as the research object,and establishes three evaluation indicators of primary energy saving rate,cost saving rate and carbon dioxide emission reduction rate in the three aspects of energy,economy and environment to evaluate the advantages and disadvantages of different systems.The results show that the performance of the solar coupled cogeneration system using the improved configuration scheme is better than that of the solar coupling cogeneration system of the traditional configuration scheme,and in the three solar energy utilization systems,the solar photovoltaic solar thermal system has the best performance after coupling with the cogeneration system under different configuration schemes,and the primary energy saving rate is the highest.In terms of operation strategy,this paper compares and analyzes the four basic operating modes of " Following the Electric Load "," Following the Thermal Load "," Hybrid Load-Following Method " and " Following the Seasonal Load ",and finds that the four basic operating strategies have the shortcomings of low equipment load rate and poor adjustability.Therefore,this paper proposes an improved operation mode based on the existing problems of operation mode-parallel machine operation.After analyzing the typical daily and comprehensive performance of the system under different operating strategies,,it is shown that improving the operation strategy and the basic operation strategy can not only improve the efficiency of the equipment,but also improve the comprehensive performance of the system by no less than 1.14%.For the problem that the solar coupled cogeneration system has a high degree of dependence on external energy,this paper uses the De ST building energy consumption simulation software to simulate the load dynamics of three buildings in an area,such as office buildings,apartments and hospitals,and designs an interconnected cooling,heating and power system.After the interconnection of the combined heating and cooling system,the monthly dependence of the combined heating and heating system used in office buildings,apartments and hospital buildings has decreased to a certain extent.