Abstract
Solar refrigeration may have applications in both developed and developing countries. Applications in developing countries such as air-conditioning, vaccine storage or large scale food preservation have been the subject of scientific research. Ammonia-water based system has good COP but generally vapor absorption refrigeration system requires high generator temperature and high circulating ratio aided by a powerful pump. Our objective was to trivialize the role of circulating ratio and simultaneously achieve higher COP. A prototype model was designed, fabricated in laboratory using scrap material and tested; performance of the unit has been analyzed. A parabolic solar trough was used as a source of heat. Various components were modeled in computer and analyzed using ANSYS. The performances and effectiveness of the unit was studied by determining refrigeration effect (RE) and coefficient of performance (COP).
Highlights
Solar refrigeration is used in areas with high insolation levels; where there is a demand for cooling and the grid power is expensive
Ammonia vapour exiting the evaporator is absorbed in a liquid solution of water-ammonia in the absorber [2]
The process is exothermic and cooling water is required to carry away the heat of absorption. The principle governing this phase of the operation is that, a vapour is more readily absorbed into a liquid solution when the temperature of the liquid solution is reduced
Summary
Solar refrigeration is used in areas with high insolation levels; where there is a demand for cooling and the grid power is expensive. Vapour absorption based refrigeration system uses process heat in a generator as main source of energy to run such system. Unlike the photovoltaic cell driven vapour compression system [3] and hybrid solar mechanical refrigeration options, the vapour absorption refrigeration system is considered a “heat driven” system that requires minimal mechanical power for the compression process [2] It replaces the energy-intensive compression in a conventional vapour compression system with a heat activated “thermal compression system”. Satish and Govind (2011), reported a detailed study of Vapor absorption system using Ammonia-water as refrigerant absorbent pair [8]. They introduced a rectifier to the conventional design to remove traces of water vapour in ammonia rich solution. The performances and effectiveness of the prototype as domestic refrigerator are analyzed
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