Questions from Thermal Fluid Science

Q: One kg of R-134a initially at 600 kPa and 25

One kg of R-134a initially at 600 kPa and 25°C undergoes a process during which the entropy is kept constant until the pressure drops to 100 kPa. Determine the final temperature of the R-134a and the...

Q: Refrigerant-134a is expanded isentropically from 600 kPa and 70°

Refrigerant-134a is expanded isentropically from 600 kPa and 70°C at the inlet of a steady-flow turbine to 100 kPa at the outlet. The outlet area is 1 m2, and the inlet area is 0.5 m2. Calculate the i...

Q: Is the value of the integral ∫12 δQ/T the

Is the value of the integral ∫12 δQ/T the same for all reversible processes between states 1 and 2? Why?

Q: Refrigerant-134a at 320 kPa and 40°C undergoes an

Refrigerant-134a at 320 kPa and 40°C undergoes an isothermal process in a closed system until its quality is 45 percent. On a per-unit-mass basis, determine how much work and heat transfer...

Q: How would you define a system to determine the rate at which

How would you define a system to determine the rate at which an automobile adds carbon dioxide to the atmosphere?

Q: A rigid tank contains 5 kg of saturated vapor steam at 100

A rigid tank contains 5 kg of saturated vapor steam at 100°C. The steam is cooled to the ambient temperature of 25°C. (a) Sketch the process with respect to the saturation lines on a T-v diagram. (b)...

Q: A 0.5-m3 rigid tank contains refrigerant-134a

A 0.5-m3 rigid tank contains refrigerant-134a initially at 200 kPa and 40 percent quality. Heat is transferred now to the refrigerant from a source at 35°C until the pressure rises to 400 kPa. Determ...

Q: Reconsider Prob. 8–42. Using appropriate software, investigate

Reconsider Prob. 8–42. Using appropriate software, investigate the effects of the source temperature and final pressure on the total entropy change for the process. Let the source temperature vary fro...

Q: Steam enters a steady-flow adiabatic nozzle with a low inlet

Steam enters a steady-flow adiabatic nozzle with a low inlet velocity as a saturated vapor at 6 MPa and expands to 1.2 MPa. (a) Under the conditions that the exit velocity is to be the maximum possibl...

Q: Steam enters an adiabatic diffuser at 150 kPa and 120°C

Steam enters an adiabatic diffuser at 150 kPa and 120°C with a velocity of 550 m/s. Determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kPa.