Abstract:

An exergy balance analysis was made for the novel bi-ejector refrigeration system under a given operating condition. The exergy efficiency and the total exergy losses of the system, the exergy loss rate and exergy efficiency of each component were calculated, and the effects of generator temperature and evaporation temperature on the exergy efficiency and the total exergy losses of the system were discussed. The results indicated that the exergy loss in the solar collector was the maximum and its exergy loss rate was 91%. The second largest exergy loss was in the gas ejector with an exergy loss rate of 5%. As the other conditions were fixed, there exited an optimal generator temperature, at which exergy efficiency was the highest and the total losses were the lowest. The total energy efficiency and exergy efficiency respectively varied in the ranges of 10%—18% and 0.3%—0.65% for generator temperature 75—120℃, evaporation temperature 7—15℃ and condensation temperature 35℃.

Key words: 太阳能, 双喷射制冷, 火用分析

摘要：

在特定工况下对新型的太阳能双喷射制冷系统进行了火用平衡分析，计算了火用效率、总火用损失及系统中各设备的火用损率和火用效率，探讨了发生器温度和蒸发温度对系统火用效率和火用损失的影响。结果表明，太阳能集热器的火用损最大，火用损率为91%，其次为气体喷射器，火用损率为5%。在其他条件一定时，系统存在一个最佳的发生器温度使系统的火用效率最高，总火用损失最小。当发生温度为75～120℃，蒸发温度为7～15℃，冷凝温度为35℃时，系统总能量效率为10%～18%，火用效率为0.3%～0.65%。

关键词: 太阳能, 双喷射制冷, 火用分析