双制冷温度双工质吸收制冷系统Ⅱ的模拟  

Simulation of Absorption Refrigeration System II with Double-Chilling Temperature and Double-Working Pair

作　　者：何景连[1] 杨景昌[1] 

机构地区：[1]四川大学化工学院,成都610065

出　　处：《制冷学报》2004年第3期40-45,共6页Journal of Refrigeration

摘　　要：为克服在较高温度的热源下只用氨作为制冷剂时采用二级再生流程系统操作压力高的弊病 ,提出了一种新的吸收制冷系统。将水 -溴化锂和氨 -硝酸锂二系统耦合 ,在后者所组成的系统 2中设置二个不同蒸发温度的蒸发器。对该系统的操作性能进行了热力学模拟 ,分析讨论了热源温度、冷却水温度和低温蒸发温度的影响及系统适宜的操作条件。在较高的热源温度和较宽的操作条件下 ,系统操作性能稳定 ,其制冷性能系数COP可以稳定在 0 .95以上 ,稍低于类似条件下只用水 -溴化锂作为工质的二级再生系统 ,但相应的制冷温度分别为 1℃和 - 5℃ ,是一种很有实用价值的吸收制冷系统。A new absorption refrigeration system was introduced for overcoming the shortcoming of the higher operation pressure at which the system operates only with ammonia as refrigerant at higher heating temperature with the two-stage generation. Water-lithium bromide system and ammonia-lithium nitrate system were coupled in the system, and the later was made up of two evaporators respectively at different temperatures. The operation performance of the present system was simulated thermodynamically. The effects of the heating temperature (T_h), the cooling-water temperature (T_(clw)), the lower evaporator temperature (T_(v22)), and the feasible operation conditions were analyzed and discussed. The operation is steady for the system at higher heating temperatures and wide operation conditions, and the coefficient of performance (COP) may retain constantly above 0.95. The COP is a little lower than that of the system only with water-lithium bromide as working pair at the similar conditions, but the corresponding chilling temperatures may be 1℃ and -5℃ respectively.

关 键 词：吸收制冷 制冷温度 热源温度 工质 蒸发温度 溴化锂 制冷性能 操作条件 操作压力 热力学模拟 

分 类 号：TB651[一般工业技术—制冷工程] TB616