Engineering, 14.02.2020 03:43 tajonae04
Moran and Shapiro, Problem 3.23 and 3.39, modified. Two kg of Refrigerant 134a undergoes a polytropic process (p×Vn = constant) in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 C. Determine the work for the process. Also, determine the heat transfer that must occur, in kJ. Hint: You will have to determine the polytropic exponent n. Repeat your calculations if the final state is, instead, 12 bar and saturated vapor. The polytropic exponent n will be different, of course
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Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10
The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa
Answers: 1
Engineering, 04.07.2019 18:10
Journeyman training is usually related (clo2) a)-to specific tasks b)-to cost analysis of maintenance task c)-to control process to ensure quality d)-to installation of machinery
Answers: 2
Moran and Shapiro, Problem 3.23 and 3.39, modified. Two kg of Refrigerant 134a undergoes a polytropi...
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