增压空气驱动LiBr吸收式制冷复合循环的热力性能分析

Thermodynamic Characteristics Analysis of a New LiBr Absorption Refrigeration Compound Cycle Driven by Charger-Air Heat

提出吸收式制冷复合循环新模式,讨论了复合循环的热力计算。单效/双效复合循环有高低压2个发生器,高压发生器由高温级热源驱动,低压发生器由来自高压发生器的冷剂蒸汽与低温级热源联合驱动,实现高低温级热源的能量梯级利用。作为实例,对由高低温两级增压空气中冷器驱动的单效/双效复合循环进行了热力计算,并与单效循环和双效循环进行了热力性能比较。结果表明,复合循环的热力系数和制冷量均比单效循环高出15%,复合循环的余热利用量和制冷量分别高出双效循环153%和110%。

A new mode of Libr absorption refrigeration compound cycle is presented and its thermal calculation is discussed in the paper. The energy cascade utilization of thermal sources with high/low temperature levels can be obtained with this new compound cycle, which includes of a high pressure generator driven by a higher temperature heat and a low pressure generator driven jointly by a higher temperature heat source and refrigerant vapor from the high pressure generator. The comparisons of thermodynamic characteristics calculation are made between the new compound cycle driven by charger-air heat and the two traditional cycles. i.e. single-effect cycle and double-effect cycle. The results show that both the thermal coefficient and refrigeration output of the new compound cycle are 15% greater than those of the single-effect cycle, the heat utilization and refrigeration output increase higher than those of double-effect cycle by 153% and 110%, respectively.