An air-conditioning system made up of a compressor and heat exchanger is shown in the figure below. This system is operating at steady-state with air flowing through the heat exchanger while the refrigerant first flows through a compressor before entering the heat exchanger. The refrigerant and air do not mix in the heat exchanger. Two control volumes are defined in the figure and both of these control volumes are to be used to answer the questions from this problem. Rotating Shaft 3 Compressor Refrigerant I 12 Control volume B wwwwww wwww Heat Exchanger 1 I Air Control I volume A The air enters the heat exchanger (inlet marked 1 in the figure) at a temperature of -13 °C, volumetric flow rate of 0.03 m³/min, and pressure of 101 kPa. Upon exiting the heat exchanger, the air is at a temperature of 42 °C (outlet marked 2 in the figure). The air can be modeled as an ideal gas with gas constant of 287 J/kg.K. The refrigerant enters the compressor (inlet marked 3 in the figure) at a temperature of 5 °C and pressure of 550 kPa and the compressor increases the pressure of the refrigerant to 1400 kPa. The refrigerant enters the heat exchanger (state 4 marked in the figure) at that pressure and at a temperature of 70 °C. The refrigerant exits the heat exchanger (state 5 marked in the figure) as a liquid at a pressure of 1400 kPa and temperature of 32 °C. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible.

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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.