Zhileng xuebao (Jan 2022)
Parametric Evaluation of Variable Effect Lithium Bromide Absorption Refrigeration Cycles Based on Variance Analysis
Abstract
A thermodynamic analysis of the variables of a novel absorption generation heat exchange (AGX) on the variable effect lithium-bromide absorption refrigeration cycle (ARC) is performed in this study. The coefficient of performance (COP) of the cycle is 0.75–1.08 when the temperature of the high-pressure generator is 93 °C–140 °C. The abovementioned cycle has more commercial value than the conventional single/double effect ARC. However, the thermodynamic analysis of the parameters in the AGX cycle is limited, and the order of significance of thermodynamic parameters on the COP has not been determined. In this study, a thermodynamic model of the AGX cycle is established using the EES software. The effects of the parameters on the system COP are analyzed. The effects of the operational parameters on the COP are investigated statistically via the analysis of variance to determine the order of significance of the parameters. The results show that when the evaporating temperature (TE) increased by 5 °C, the COP increased by 11.8% (from 1.035 to 1.157); the absorption temperature (TLA) decreased by 5 °C; the COP increased by 9.5% to 1.133; the condensing temperature (TC) decreased by 5 °C; the COP increased by 6.7% to 1.104. TE contributes most significantly to the COP, with a contribution percentage of 45.67%, followed by TLA (29.80%), TC (17.93%), and R1 (0.02%). Therefore, TE should be prioritized in the system design and operation control to maximize the COP of the AGX cycle.
