Optimal design and performance vapour absorption refirgeration system
T. Subba Rayudu, D. Muralidhar Yadav
Absorption cooling systems have become increasingly popular in recent years from the viewpoints of energy and environment. Despite the lower coefficient of performance (COP) as compared to that of vapor compression cycle, absorption refrigeration systems are attractive for using inexpensive waste heat, solar, geothermal or biomass energy sources for which the cost of supply is negligible in many cases. In addition absorption refrigeration use natural substances, which do not cause any ozone layer depletion.
Here will be a considerable amount of waste heat from any power plant. The heat can be utilized in various ways for different purposes. Perennial problem with waste heat is the capital cost of plant, required to make its utilization justifiable. A good example of this is the use of waste heat to power absorption refrigerators. Similarly, here the waste heat from the power plant is used for running a vapor absorption refrigeration system. The aim of this paper is to arrive at with an optimum design of a vapor absorption refrigeration system (VARS) driven by any waste heat available. This involves a mathematical modeling of the vapor absorption system to produce the maximum tons of refrigeration (TR) for a given heat load. The design parameters and factors that are affecting the performance of the VARS are studied. Also a cost analysis of the system was performed. The designed system is then thermo-economically evaluated to identify the effects of design variables on costs. Thereby values of new design variables that would make the overall system cost-effective with better performance are suggested.