An ammonia compression refrigeration system is used to provide the cooling required for a refrigeration plant with a capacity of 1278 tons of refrigeration. The temperature of the evaporator and condenser is -25°C and 48°C, respectively. If the ammonia is superheated at the output of the liquid-suction converter at 5 °C, determine the mass flow rate of the refrigerant and the operating coefficient of the system. Consider the isentropic efficiency of the compressor to be 85%.

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Stress transformation

The term stress indicates the measure of internal forces that develop due to an external force's application on an object. When a specific external force is applied to an object, internal stress generates in the material. The value of stress can obtain by taking the ratio of the externally applied force and cross-sectional area of the object. There are different types of stress depending on the type of external force.