双分层水箱太阳能喷射制冷循环特性

本文提出一种采用双分层水箱的太阳能喷射制冷循环,分层水箱热分层显著,颇具可用能储存优势,结合大小水箱各自的优势弥补因太阳日辐射量波动而导致太阳能利用率不高、太阳能驱动的喷射制冷效率较低等问题。采用逐时冷负荷分析法分析了双分层水箱太阳能喷射制冷系统特性,结果表明:该制冷循环高品位能耗约为普通机械压缩制冷循环的1/5,较传统水箱太阳能喷射制冷循环全天工作时间约多4 h,日产冷量提高36.8%,且分层水箱喷射制冷系统的逐时制冷量与办公室逐时冷负荷更吻合。

Performance of Solar-powered Ejector Refrigeration System with Double-partitioned Water Storage Tanks

A solar-powered ejector refrigeration system with double-partitioned water storage tanks was proposed and analyzed. The stratified water tank had higher energy storage capacity and better thermal stratification than the conventional design. The advantages of a partitioned water storage tank and large and small water tanks were fully utilized in the novel system to compensate for the disadvantages of low solar energy utilization and low solar-powered ejector refrigeration efficiency, which resulted from the solar energy instability. In this study, the performance of the novel system was analyzed using an hourly cooling load analysis method. The high-grade energy consumption of the novel system is approximately 1/5 that of the conventional mechanical compression refrigeration cycle. The whole-day working time increases by 4 hours and the cooling capacity increases by 36.8% compared with the solar-powered ejector refrigeration cycle for the conventional water tank. In addition, the hourly cooling capacity of the novel system and the hourly cooling load of the office are more consistent than those of the conventional system.