Refrigerant (known as R-134a) enters a heat exchanger at 100 kPa. The refrigerant is of 20% quality upon entering. It exits the heat exchanger as a saturated vapor also at 100kPa. An unknown liquid (specific heat capacity of 3.9 kJ/Kg.K) enters the heat exchanger at a rate of 1.1 kg/sec at 320.15 Kelvin. This unknown liquid exits at 278.15 degrees kelvin.  Find: The mass flow rate or the refrigerant [kg/sec]Q (the rate of heat transfer)

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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.