Thermodynamic performance evaluation of triple effect H2O -Li/Br vapour absorption systems using multi cascading of vapour compression cycles for ultra-low temperature applications

Abstract

The use of vapour absorption refrigeration system is a brilliant way towards utilizing waste heat from industrial processes. H2OLi/Br absorption refrigeration system and ammonia–water absorption refrigeration systems are commonly used for low temperature applications. Even though ammonia–water absorption refrigeration system is commonly used for freezing applications with temperatures lower than 0 [1-2]. A number of research work is devoted to thermodynamic, analyses of vapour absorption refrigeration systems. The performance of NH3H2O system has low first law efficiency. When the refrigeration temperature is lower than -25C, the thermal performance dramatically decreases. Kaushik and Arora[3-4] carried out the energy and energy analysis of single effect and series flow double effect water–lithium bromide absorption system and developed thermal computational model for parametric investigation. Their analysis involves the effect of generator, absorber and evaporator temperatures on the energetic and energetic performance. They concluded that the irreversibility is highest in the absorber in both systems as compared to other systems. In the present-day, the situation, the energy, exergy, economy, environment and safety strategies are the key issues which are practicality restrained to evaluate refrigeration cycles both having higher as well as ultralow evaporator temperatures. Tassou et al. [5], suggested that the refrigeration is a necessary part of the food chain and to slow down the physical, chemical and microbiological activities that cause deterioration in food, the food is frozen between18 to35°C. Generally, technologies of mechanical refrigeration are Abstract