Questions from Thermal Fluid Science

Q: Reconsider Prob. 7–116. Using appropriate software, investigate

Reconsider Prob. 7–116. Using appropriate software, investigate the effect of the network output on the required temperature of the steam during the heat rejection process. Let the work output vary fr...

Q: Consider a Carnot refrigeration cycle executed in a closed system in the

Consider a Carnot refrigeration cycle executed in a closed system in the saturated liquid–vapor mixture region using 0.96 kg of refrigerant-134a as the working fluid. It is known that the maximum abso...

Q: Reconsider Prob. 7–118. Using appropriate software, investigate

Reconsider Prob. 7–118. Using appropriate software, investigate the effect of the network input on the minimum pressure. Let the work input vary from 10 to 30 kJ. Plot the minimum pressure in the refr...

Q: Are the efficiencies of all the work-producing devices, including

Are the efficiencies of all the work-producing devices, including the hydroelectric power plants, limited by the Kelvin–Planck statement of the second law? Explain.

Q: Consider a Carnot heat-engine cycle executed in a steady-

Consider a Carnot heat-engine cycle executed in a steady-flow system using steam as the working fluid. The cycle has a thermal efficiency of 30 percent, and steam changes from saturated liquid to satu...

Q: Consider two Carnot heat engines operating in series. The first engine

Consider two Carnot heat engines operating in series. The first engine receives heat from the reservoir at 1400 K and rejects the waste heat to another reservoir at temperature T. The second engine re...

Q: A heat engine operates between two reservoirs at 800 and 20°

A heat engine operates between two reservoirs at 800 and 20°C. One-half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2°C an...

Q: An old gas turbine has an efficiency of 21 percent and develops

An old gas turbine has an efficiency of 21 percent and develops a power output of 6000 kW. Determine the fuel consumption rate of this gas turbine, in L/min, if the fuel has a heating value of 42,000...

Q: Consider a Carnot heat-pump cycle executed in a steady-

Consider a Carnot heat-pump cycle executed in a steady-flow system in the saturated liquid vapor mixture region using refrigerant-134a flowing at a rate of 0.18 kg/s as the working fluid. It is known...

Q: Hyperthermia of 5°C (i.e., 5°

Hyperthermia of 5°C (i.e., 5°C rise above the normal body temperature) is considered fatal. Express this fatal level of hyperthermia in (a) K, (b) °F, and (c) R.