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溴化锂吸收制冷技术能有效回收低品位余热,但不同场合的余热品位各异,因此有必要从理论上分析溴化锂吸收制冷机的驱动温度下限,本文研究了多级溴化锂吸收制冷机的驱动温度下限的变化规律,结合多级系统的热力学原理导出了驱动温度下限的理论表达式,研究了多级系统的性能系数和(火用)效率。结果表明驱动温度下限与蒸发温度、吸收温度及级数多少相关,级数增加会导致系数性能系数和(火用)效率的下降.
Lithium bromide absorption refrigeration technology can effectively recover low-grade waste heat, but different occasions, different levels of waste heat, it is necessary to theoretically analyze the lithium bromide absorption refrigerator driving temperature lower limit, this paper studied the lithium bromide absorption refrigerator lower driving temperature limit The theoretical expression of lower limit of driving temperature is derived based on the thermodynamic principle of multi-level system. The performance coefficient and exergy efficiency of multi-level system are studied. The results show that the lower driving temperature is related to the evaporation temperature, the absorption temperature and the number of stages. Increasing the series will lead to the decrease of coefficient of performance and exergy efficiency.