Thermodynamic analysis and design of distillation column of the absorption refrigeration system

IV THERMODYNAMIC ANALYSIS AND DESIGN OF DISTILLATION COLUMN OF THE ABSORPTION REFRIGERATION SYSTEM (M.Sc. Thesis) Fatma AKINCI GAZİ UNIVERSITY INTSTITUTE OF SCIENCE AND TECHNOLOGY February 1991 ABSTRACT In this study, the thermodynomic analysis and the design of distilla tion column of a single effect absorption type refrigeration system is performed. NH /H 0 was used as refrigeratn/absorber pairs. Absorp- tion refrigeration system consist of condenser, evaporator, absorber, refrigerant distillation column, deflacmator, several pumps, expansi on valves, refrigerant and mixture heat exchangers. In the analysis, the followingassumptions have been made, the outlet vapor temperature of deflacmator is equal to the deflacmator temperature; mass fraction is 0,999; the mixture coming from the evaporator is at the vapor pha se and its temperature is equal to the evaporator temperature. In the calculations, the pressure drop over the separator and condenser, evaporator and absorber have been considered. To see the effect of pressure loss. The outlet temperatures of fluids from the heat exchanger effectiveness as 0,8. Thermodynamics properties at the re ferans ; points of system, theoretical and actual plate numbers of distillation column, the column effectiveness and column dimensions have been calculated. Maximum theoretical number of plates at the se- perator temperature of 150 °C and evaporator temperature of -20 °C have been obtained. Refrigeration load has been taken as 1 kW. Beca use, this is too low value, the methods found from the literature co uld not be used seasily. The results obtained from the design of co lumn have been compared with the results of Ponchon-Savarit grafic method. These results have been shown in Tables and in diagrams.