A tank contains 15 kg of R134a, initially at 2°C with a quality of 0.28. The pressure is held constant by nitrogen gas acting against a flexible bladder as shown. The valve is opened between the tank and a supply line carrying R134a at 920 kPa, 135°C. The pressure regulator allows the pressure in the tank to remain constant as the bladder expands. The valve between the line and the tank is closed at the instant when the quality is 0.92. If the entropy generation amounts to 1.025 kJ/K, determine the (a) mass of R134a contained in the tank at the final state, in kg and the (b) heat transferred in kJ. Is heat absorbed or released during the process? Show your mass, energy and entropy balance equations at the start of your solution.

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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.