基于太阳能余热利用下的吸收式制冷系统的可行性研究

对南京某商用建筑真空热管太阳能热水系统进行相关参数测试,在平均辐照强度约为614.2 W/m²的照射条件下,集热器平均集热效率可达45%,8 m³蓄热水箱经过4 h的加热后,共吸收653 MJ的热量,水箱温度从63.8 ℃升高至80 ℃以上,达到了单效溴化锂吸收式制冷机组的驱动热源温度. 实验表明,该系统采用吸收式制冷来利用太阳能余热的技术方案具有可行性. 在此基础上,利用TRNSYS软件搭建溴化锂吸收式制冷系统模型,预测分析了吸收式制冷系统在实验当日辐照条件下的运行性能,结果表明该吸收式制冷系统在无辅助热源的条件下,可稳定运行5 h,系统性能系数COP的平均值为0.66,平均制冷量为9.41 kW,对其他地区将太阳能余热用于吸收式制冷的可行性研究具有一定的参考价值.

Feasibility Study of Absorption Refrigeration System Based on Solar Energy Waste Heat Utilization

The relevant parameters of a vacuum heat pipe solar water heating system in a commercial building in Nanjing are tested. Under the average irradiation intensity of 614.2 W/m²,the average heat collection efficiency of the collector can reach 45%. The 8 m³ hot water storage tank absorbs a total of 653 MJ Heat,after being heated for 4 hours,the temperature of the water tank increases from 63.8 ℃ to over 80 ℃,reaching the driving heat source temperature of a single-effect lithium bromide absorption refrigeration unit,which proves the feasibility of the system using absorption refrigeration to utilize solar waste heat. On this basis,the TRNSYS software is used to build a simulation model of the lithium bromide absorption refrigeration system,and predict and analyze the operation performance of the absorption refrigeration system under the irradiation conditions on the day of the experiment. The results show that the absorption refrigeration system can run stably for 5 hours without an auxiliary heat source,that the average value of the system performance coefficient COP is 0.66,and that the average cooling capacity is 9.41 kW. It has certain reference value for the feasibility study of solar energy waste heat used in absorption refrigeration in other regions.