(7) An industrial plant has available a 4-cylinder, 76-mm bore by 102-mm stroke, 800 rpm, single-acting compressor for use with Refrigerant 12. Proposed operating conditions for the compressor are 38°C condensing temperature and 5°C evaporating temperature. It is estimated that the refrigerant will enter the expansion valve as a saturated liquid, that the vapor will leave the evaporator at a temperature of 7°C, and will enter the compressor at a temperature of 13°C. Assume a compréssor volumetric efficiency of 70 per cent. Assume frictionless flow. Calculate the refrigerating capacity in kW for a system equipped with this compressor. Ans. 40.96 kW

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.