Research On Solar Energy Coupled Biomass Combined Heating System

With the national goal of "double carbon",the energy structure is changing at an accelerated pace,and clean heating has become the focus of work in the field of building energy efficiency.As a key area for air pollution prevention and control,rural areas are relatively backward in terms of heating methods,and high energy consumption,high pollution and low efficiency building heating methods such as coal-fired heating still exist.In response to this problem,Qinhuangdao area has carried out the renovation work with "solar thermal + biomass" as the main method,supplemented by air source heat pumps and other renovation methods.In this paper,based on the existing retrofitting scheme,a biomass coupled with solar energy combined heating system scheme is proposed.This paper takes the actual needs of farmers as the starting point,combines the architectural characteristics of rural areas in Hong Kong and the way of obtaining biomass fuel,and makes reference to the existing research on dual heat source coupled heating system and biomass direct-fired boiler,in order to reduce the economic cost of heating for farmers,improve the efficiency of renewable energy utilization,and innovate the connection method and operation mode of the traditional dual heat source coupled heating system.In order to determine the basic parameters of system operation,load calculation and equipment selection were carried out,mathematical models of solar collector energy balance and system energy conservation were constructed,and the theoretical analysis and design of the scheme system were completed.In this paper,TRNSYS software was used to establish the system model and simulate the system operation under full working heating conditions;the flow rate ratios under the parallel mode of dual heat sources were used as variables to study the operating characteristics of the system for three typical working days of the heating season and the annual heating cycle.On this basis,the changes of parameters such as heat collection efficiency and solar guarantee rate under the system operating conditions are also explored,and the system is optimized and analyzed.The paper also evaluates and analyzes the designed system in terms of economy,energy efficiency and environmental benefits,explores the benefits advantages of the combined system in the whole life cycle,and determines the feasibility of the combined system to be promoted in rural building heating applications.The solar coupled biomass combined heating system designed in this paper can effectively improve system efficiency,reduce air pollution,and save farmers’ heating costs,which is a guiding meaning for future heating renovation in rural areas.