低温热驱动双级libr h2o吸收式制冷系统的理论分析----外文翻译.doc

摘要：一份详细的理论分析,提出了两级libr/h20吸收制冷系统,是由一个蒸发器、低压吸收器、低压发生器、高压吸收器、高压发生器、冷凝器、低压热交换器和高压热交换器组成.是通过低温热源驱动的. 由理论分析和初步实验比较结论表明,发展理论分析体系可以合理准确地描述一个实际系统,并且今后的有广阔的发展前途。
关键字:吸收；溴化锂--水溶液；双级
文献著作上的吸收式制冷系统是由低品位的能量驱动的,例如:太阳能,工业废热.图1-5说明这些系统按照不同的工质一般分为两种类型:吸收式制冷系统,利用水和溴化锂工质对,氨水工质对,水-氯化锂工质对;吸附系统,使用氯化物和氨吸附剂,水-硅胶,水合物,活性炭-甲醇.但是,只有吸收式制冷系统利用水合溴化物作为工质对得以成功运作并已投入商业使用中。
单级溴化锂吸收式制冷系统通常是由一个蒸发器,一个吸收器,一个发生器,一个冷凝器和一个热交换器组成.这个系统的运作中,水作为制冷剂,溴化锂作为吸收剂,并且热源要求至少要在摄氏86度以上,为了达到一个合理的制冷系数(COP)。然而,存在大量小于86摄氏度的低温热源,例如:工业废热,太阳能和地热.如果这些低温热源能被利用或再利用,它不但可以提高能源系统的整体效率,而且还可以减少对环境的热污染。
双级溴化锂制冷系统,以水作为制冷剂,溴化锂作为吸附剂,然而它的运行要求75到86摄氏度的热源即可并且它的制冷系数(COP)在0.38以上,这样的系统可以达到当冷凝水是


Abstract: A detailed theoretical analysis is presented for a two-stage LiBr/H20 absorption refrigeration system, which consists of an evaporator, a low-pressure absorber, a low-pressure generator, a high-pressure absorber, a high-pressure generator, a condenser, a low-pressure heat exchanger and a high-pressure heat exchanger, driven by a low-temperature hot source. A comparison of results from the theoretical analysis and preliminary experiment indicates that the theoretical analysis developed can represent a real system with a reasonable accuracy, and is useful for future development.
Keywords: absorption； water-lithium ；bromide；two-stage
Literature on absorption refrigeration systems driven by a low-grade energy source such as solar energy or waste heat in industries has been presented 1-5. These systems can in general be classified into two types according to the different working fluids: absorption refrigeration systems, using water-lithium bromide (LiBr/H20), water-ammonia (H20/NH3), water-lithium chloride (LiCI/H20); and adsorption systems, using ammonia calcium chloride (CaCI2/NH3), water-silica-gel, water zealot, activated charcoal-methanol (CH3OH). However, only absorption refrigeration systems using water lithium bromide as working fluid have been operated successfully and have found commercial applications.