Air is compressed by a 15-kW compressor from pressure P1 to pressure P2. The air temperature is maintained constant at 25°C during the process as a result of heat transfer to the surrounding medium at 20°C. Determine (a) the amount of heat per unit time in kW rejected to the environment, and (b) the rate of entropy change of the air. State all key assumptions.

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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.