Evaluation of mass flowing with COP for triple effect absorption refrigeration system

Abstract

Triple effect absorption refrigeration system has the highest performance among its counterparts. Coefficient of performance of this system is higher than those single and double effect absorption refrigeration systems but its system design involves more system components which make the thermodynamic cycle more complex. A basic absorption refrigeration system has only an evaporator, a condenser, an absorber and a generator. Adding heat exchanger/s improves the coefficient of performance. Absorption refrigeration systems do not involve a compressor as compared to vapor compression systems due to absorber and generator. The high-pressure generator is the significant components of an absorption refrigeration system which allows to use solar energy and industrial waste heat as a heat source. In this study, a thermodynamic analysis was performed for a lithium bromide-water series flow triple effect absorption refrigeration system including eight different mass flow lines. The variation in coefficient of performance with mass flow rates in the cycle was investigated thoroughly. It was indicated that mass flow rates of the solutions decrease with increasing temperature of the low-pressure generator and this has resulted in a positive impact on the coefficient of performance. Evaporator temperature has the same effect with low pressure generator on the system but the effect of condenser temperature is vice versa.