NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A piston-cylinder device initially contains 2 kg of refrigerant-134a at 100 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 120 kPa. Heat transfer continues until the temperature reaches 80°C. Assume the surroundings to be at 25°C and 100 kPa. R-134a 100 kPa 20°C Q 150°C Problem 08.048.d - Efficiency of Piston Device with Refrigerant Determine the second-law efficiency of this process. The second-law efficiency of this process is %.

NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A piston-cylinder device initially contains 2 kg of refrigerant-134a at 100 kPa and 20°C. Heat is now transferred to the refrigerant from a source at 150°C, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 120 kPa. Heat transfer continues until the temperature reaches 80°C. Assume the surroundings to be at 25°C and 100 kPa. R-134a 100 kPa 20°C Q 150°C Problem 08.048.d - Efficiency of Piston Device with Refrigerant Determine the second-law efficiency of this process. The second-law efficiency of this process is %.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An adiabatic air compressor compresses 10.4 L/s of air at 120 kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific heat of air at the average temperature of 160°C = 433 K is cp= 1.018 kJ/kg.K. The gas constant of air is R = 0.287 kPa.m³/kg-K. 1 MPa 300°C Compressor 120 kPa 20°C Vus Determine the work required by the compressor. (You must provide an answer before moving on to the next part.) The work required by the compressor is -4.578 kJ/kg.
Define the work (boundary) done on an adiabatic system is equal to the increase in the energy of the system.
a) A gas is trapped in a piston-cylinder device. The initial pressure and temperature of the gas are 500 kPa and 300 K, respectively. The system undergoes an isothermal expansion process, in which 15KJ of boundary work is done by the gas and 3KJ of paddle-wheel work is done on the gas. Determine the amount heat transfer during this process. Explain the direction of the heat transfer.
As shown in the figure, a 320-ft³ tank contains 25 lb of H₂O initially at 30 lbf/in². The tank is connected to a large steam line carrying steam at 200 lbf/in², 450°F. Steam flows into the tank through a valve until the tank pressure reaches p2 = 100 lbf/in² and the temperature is 400°F, at which time the valve is closed. Step 1 Steam at 200 lbf/in.2, 450°F Am 12 = i (1) Valve AD Determine the amount of mass that enters the tank, in lb. lb (1) Determine the amount of mass that enters the tank, in lb, and the heat transfer to the tank from its surroundings, in Btu. Tank Initially: 30 lbf/in.², m₁ = 25 lb (2) Finally: P₂ lbf/in.², 400°F.