THERMODYNAMIC ANALYSIS AND COMPARISON FOR “COP” IN SALT-METAL CLORIDE PACKED BED SYSTEMS

Abstract

Solid absorption refrigeration systems are environment friendly as they use low grade thermal energy and the refrigerants used have zero ozone depletion potential and very low global warming potential. However heat powered sorption units require thermal energy, which in most cases is provided by natural gas, solar energy or fuel combustion also resulting in CO2 emission. Therefore care must be taken that the efficiency of the solid sorption units is high enough to cause as little global warming as possible. Though lot of efforts have been made in this field, COP of the solid sorption refrigeration system is still quite low compared to vapour compression refrigeration systems, thus there is a need for further research to make these systems a viable alternative to vapour compression systems. In this study solid BaCl2 &SrCl2 are used as solid absorbent and ammonia as refrigerant .The technical feasibility of the system is studied using a simple thermodynamic model assuming ideal material kinetics. In this thesis it shown that the variation of the COP & second law COPC with the variations of evaporator temperature and maximum desorption temperature .The main results showed that the generation temperature is very low for the BaCl2 - NH3 system, as shown by a comparative study of SrCl2 - NH3 system and BaCl2 - NH3 systems