Abstract
The vapor compression refrigeration system and properties of refrigerants, such as ammonia and Freon (R-12) are focused on in this chapter. It discusses the conversion of pressure values obtained from a pressure gauge into temperatures, determining the pressure–temperature relation for ammonia—widely used as a refrigerant in mechanical vapor compression refrigeration systems. In designing refrigeration systems, it is often necessary to determine the pressure–enthalpy data for a given refrigerant. The efficiency of a vapor compression refrigeration system is evaluated by calculating its coefficient of performance. In this chapter, the mathematical relationships describing pressure–enthalpy data for ammonia are programmed into a worksheet. Also, a worksheet is shown that will assist in evaluating the performance of refrigeration systems that utilize Freon (R-12). Quality attributes in foods during storage and distribution are largely influenced by the ambient temperature and time. Freezing times in foods are commonly predicted using Plank's equation, chiefly to determine the freezing time of a spherical-shaped food and the influence of changing the transport and distribution time on the quality of food.
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