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uestion No 3. a. A 0.1-m rigid tank initially contains refrigerant 134a 1 MPa and 100 percent quality. The tank is connected by a valve to a supply line that carries refrigerant 134 1.2 MPa and 30°C. Now the valve is opened, and the refrigerant is allowed to enter the tank The valve is closed when it is observed that the entire tank contains saturated liquid a 1.2 MPa. Draw the process on a T-v diagram and determine: (a) the initial and final temperature of the refrigerant. (b) the mass of the refrigerant that has entered the tank (c) the amount of heat transfer during this process. (d) the entropy change of the refrigerant inside the rigid tank. (e) the exergy destructed inside the tank during the process 3. b. A well-insulated heat exchanger is to heat water (cp 4.18 kJ/kg. C) from 25oC to 60oC at a rate of 0.4 kg/s. The heating is to be accomplished by geothermal water (cp 4.31 kJ/kg. C) available at 140°C at a mass flow rate of 0.3 kg/s as shown in the Figure The inner tube is thin-walled and has a diameter of 0.6 cm. Determine: (a) the rate of heat transfer (b) the rate of entropy generated in the heat exchanger (c) the rate of exergy destruction in the heat exchanger
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