摘要
比较了两种可利用低品位热能的吸收-喷射复合制冷循环的性能。在循环1中,冷凝器出口的部分饱和液态制冷剂被冷剂泵加压到与发生温度对应的饱和压力,继而在一个沸腾器里面被加热成饱和高压蒸气,这股高压制冷剂蒸气将预器出口的过热蒸汽引射到冷凝压力;在循环2中,发生器出口的部分高压制冷剂蒸气,将蒸发器出口的蒸气引射到吸收压力。对于采用氨-硫氰酸钠工质对的两种循环,模拟研究表明前者的性能系数比后者高15%以上,且增幅随着蒸发温度以及发生温度的降低愈显著。
The performance of two combined absorption-ejector refrigeration cycles driven by low grade heat are compared. In the first cycle, part of the saturated liquid refrigerant in a condenser outlet is pressurized to the saturated pressure corresponding to generation temperature by a refrigerant pump, and then it is heated to be saturated high - pressure vapor in a boiler. Then this fluid ejects the superheated vapor coming of precooler to the condensing pressure. In the second cycle, part of vapor out from generator ejects the vapor from an evaporator to absorbing pressure. For the two cycles using NH3 - NaSCN as the working pair, simulation results show that performance of the former cycle is at least 15% higher than that of the latter one and the relative increase ratio increases as evaporation temperature or generation temperature decreases.
出处
《流体机械》
CSCD
北大核心
2012年第2期52-56,共5页
Fluid Machinery
基金
国家高技术研究发展计划(863计划)
新型太阳能热泵技术研究(2008AA05Z419)
关键词
吸收-喷射复合制冷
低温
性能系数
氨-硫氰酸钠
combined absorption - ejector refrigeration
low temperature
coefficient of performance
NH3 - NaSCN
