Questions from Thermal Fluid Science

Q: R-134a vapor enters into a turbine at 250 psia and

R-134a vapor enters into a turbine at 250 psia and 175°F. The temperature of R-134a is reduced to 20°F in this turbine while its specific entropy remains constant. Determine the...

Q: Water vapor enters a compressor at 35 kPa and 160°C

Water vapor enters a compressor at 35 kPa and 160°C and leaves at 300 kPa with the same specific entropy as at the inlet. What are the temperature and the specific enthalpy of water at the...

Q: Refrigerant-134a enters an adiabatic compressor as saturated vapor at 160

Refrigerant-134a enters an adiabatic compressor as saturated vapor at 160 kPa at a rate of 2 m3/min and is compressed to a pressure of 900 kPa. Determine the minimum power that must be supplied to the...

Q: The compressor in a refrigerator compresses saturated R-134a vapor at

The compressor in a refrigerator compresses saturated R-134a vapor at 0°F to 200 psia. Calculate the work required by this compressor, in Btu/lbm, when the compression process is isentropic.

Q: How do the values of the integral ∫12 δQ/T

How do the values of the integral ∫12 δQ/T compare for a reversible and an irreversible process between the same end states?

Q: What is a quasi-equilibrium process? What is its importance

What is a quasi-equilibrium process? What is its importance in engineering?

Q: An isentropic steam turbine processes 2 kg/s of steam at

An isentropic steam turbine processes 2 kg/s of steam at 3 MPa, which is exhausted at 50 kPa and 100°C. Five percent of this flow is diverted for feedwater heating at 500 kPa. Determine the...

Q: Water at 10°C and 81.4 percent quality is

Water at 10°C and 81.4 percent quality is compressed isentropically in a closed system to 3 MPa. How much work does this process require in kJ/kg?

Q: Two kg of saturated water vapor at 600 kPa are contained in

Two kg of saturated water vapor at 600 kPa are contained in a piston–cylinder device. The water expands adiabatically until the pressure is 100 kPa and is said to produce 700 kJ of work output. (a) De...

Q: A piston–cylinder device contains 5 kg of steam at 100

A piston–cylinder device contains 5 kg of steam at 100°C with a quality of 50 percent. This steam undergoes two processes as follows: 1-2 Heat is transferred to the steam in a reversible manner while...