Abstract:

The refrigeration requirements are stringent in the countries which have ample sunshine and, the technological solutions based upon solar radiations for meeting the refrigeration requirements could a boon. The present work deals with the development of a diffusion absorption refrigeration cycle based refrigeration system operated by solar energy. This study focuses on the thermodynamic modelling of NH3 – H2O diffusion absorption refrigeration cycle with helium as pressure equalizing gas. Results obtained from the parametric analysis show that 1.3% profit in refrigerating effect is observed when 3 °C sub-cooling occurs in condenser. The coefficient of performance gain gets up to 23% for ammonia mass fraction ranges from 0.28 to 0.58 as compared to the DAR cycle using saturated condensed liquid. A loss of 3.02% in coefficient of performance is seen for 10°C decrease in evaporator temperature. A range of the generator temperature lies between 140°C≤ Tg≥ 160°C is best suited for optimum coefficient of performance.<

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