采用不同集热器的太阳能吸收式制冷系统经济性分析

以能源平均成本和动态投资回收期为经济性指标,对采用平板集热器、真空管集热器、复合抛物面集热器和槽式集热器驱动的太阳能单效溴化锂吸收式制冷系统进行了对比分析,同时以?效率和动态投资回收期为目标对优选的太阳能制冷系统进行了多目标优化。结果表明：采用真空管集热器的太阳能制冷系统的能源平均成本最低及动态投资回收期最短;发生器热水进口温度存在最优值使得系统?效率最高,能源平均成本最低;增加系统装机容量可有效降低系统的能源平均成本并且缩短投资回收期;太阳辐照强度越大,太阳能制冷系统的能源平均成本越低及投资回收期越短。此外,多目标优化结果表明发生器热水进口温度存在最优值可使得综合目标函数取得最小值。

Economic Analysis of Solar Powered Absorption Refrigeration System Powered by Different Solar Collectors

With levelized energy cost (LEC) and dynamic investment pay-back period (DIPP) as performance indicators, the economic performance of single-effect LiBr absorption refrigeration systems driven by four different solar collectors were investigated including flat-plate collector, evacuated-tube collector, compound-parabolic collector and parabolic-trough collector. Furthermore, multi-objective optimization of the selected solar powered system was performed based on the exergy efficiency and DIPP. The results showed that the LEC and DIPP of refrigeration system driven by evacuated-tube collector were optimal, and there existed an optimum value of T_hf, in which corresponds to the maximum exergy efficiency and minimum LEC. The LEC and DIPP of the system decreased with the increase of cooling capacity as well as solar radiation intensity. Besides, the multi-objective optimization indicated that there was an optimum hot water temperature at the generator inlet that corresponds to the minimum value of multi-objective function.