A volume flow of air at 500K, 20 bar passes in a long pipe through a temperature reservoir that is kept at a temperature of 1000°C. The air exits at 1000K and 1.8 MPa. Air as ideal gas with variable specific heats, R = 0.287 KJ/Kg-k

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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.