太阳能跨季节储热供热系统性能研究

Study on the performance of a solar seasonal heat-storage and heating system

为促进太阳能跨季节储热供热(SSSH)系统在严寒地区的推广应用,以张家口市某严寒地区办公楼为研究对象,结合试验和TRNSYS动态仿真软件对集热(储热)启/停控制条件、供热性能和地温变化等进行了研究。试验结果表明,集热启/停温差增大,集热效率降低;储热启动温度升高,集热效率和储热效率均下降。模拟预测结果表明,随着集热(储热)启动温度、停止温度或启停温差的增大,集热(储热)效率均会降低,而集热(储热)循环能效比会增大。储热启动温度平均每升高1℃,集热效率和储热效率平均下降0.7%和0.3%;集热启/停温差每增大1℃,集热效率平均下降1.7%,而集热循环能效比增加2.0%。供热季热泵机组性能系数和系统性能系数分别为3.4和3.1;地温初始值为6.12℃,经过储热—供热完整循环,最终值为6.91℃,满足系统长期稳定运行要求。

A solar seasonal heat storage and heating(SSSH)system for an office building in a severe cold area of Zhangjiakou is studied,to promote the application of SSSH system.The start/stop control conditions of heat collection(heat storage),heating performance and ground temperature variation are analyzed by taking experiments and TRNSYS dynamic simulation.The experiment results show that the heat collection efficiency decreases with the increase of the start/stop temperature difference,and the heat collection efficiency and storage efficiency decrease with the increase of start-up temperature of heat storage.The simulation results show that with the increase of start-up temperature,stop temperature or start/stop temperature difference of heat collection and the heat collection(heat storage)efficiency will decrease,while energy efficiency ratio of heat collection(heat storage)cycle will increase.Every 1℃increase of heat storage starting temperature will lead to a 0.7%decrease and a 0.3%decrease in heat collection and heat storage efficiencies on average.And every 1℃increase of the start/stop temperature difference will reduce the heat collection efficiency by 1.7%,while increase the energy efficiency ratio of heat collection cycle by 2.0%.The COP of the heat pump and the system are 3.4 and3.1 in heating seasons,respectively.Completing the cycle of heat storage and heating,the ground temperature rises from6.12℃to 6.91℃,which meets the requirements of long-term stable operation of the system.