OPERATION PERFORMANCE ANALYSIS OF CENTRALIZED AND DISTRIBUTED COMBINED HEAT STORAGE SYSTEM FOR DISTRICT SOLAR HEATING
In response to the problems of low collection efficiency and large heat loss caused by the high operating temperature of traditional solar heating systems that only rely on centralized heat storage,this study proposes the centralized and decentralized combined heat storage systems for district solar heating,establishes the mathematical and physical model of the combined heat storage system,compiles the simulation program of the combined heat storage system using Matlab platform,and compares the system with the centralized heat storage system for district solar heating.The results show that compared to the centralized heat storage system,the solar fraction of the combined heat storage system in Xining Area has increased by about 36%,and the monthly solar heating capacity is more stable.The total heat collection efficiency of the combined heat storage system is increased by about 10%.Compared to the centralized heat storage system,the operating temperature of the combined heat storage system decreases,with the average temperature of the centralized buried heat storage water body decreasing by about 17℃throughout the year,and the average temperature of the heating pipeline network decreasing by about 27℃throughout the year.The total heat loss of the combined heat storage system decreased by 2.23 TJ,with the heat loss of the heating network only 39%of that of the centralized heat storage system.
solar heatingheat storageheat pumpMatlabsolar fractionheat collection efficiency
万方数据
维普
