Questions from Thermal Fluid Science

Q: A completely reversible heat engine operates with a source at 1500 R

A completely reversible heat engine operates with a source at 1500 R and a sink at 500 R. At what rate must heat be supplied to this engine, in Btu/h, for it to produce 5 hp of power?

Q: An inventor claims to have developed a heat engine that receives 700

An inventor claims to have developed a heat engine that receives 700 kJ of heat from a source at 500 K and produces 300 kJ of net work while rejecting the waste heat to a sink at 290 K. Is this a rea...

Q: A Carnot heat engine operates between a source at 1000 K and

A Carnot heat engine operates between a source at 1000 K and a sink at 300 K. If the heat engine is supplied with heat at a rate of 800 kJ/min, determine (a) the thermal efficiency and (b) the power o...

Q: A heat engine operates between a source at 477°C and

A heat engine operates between a source at 477°C and a sink at 25°C. If heat is supplied to the heat engine at a steady rate of 65,000 kJ/min, determine the maximum power output of this heat engine.

Q: What is the Kelvin–Planck expression of the second law of

What is the Kelvin–Planck expression of the second law of thermodynamics?

Q: Reconsider Prob. 7–79. Using appropriate software, study

Reconsider Prob. 7–79. Using appropriate software, study the effects of the temperatures of the heat source and the heat sink on the power produced and the cycle thermal efficiency. Let the source tem...

Q: An experimentalist claims that, based on his measurements, a heat

An experimentalist claims that, based on his measurements, a heat engine receives 300 Btu of heat from a source of 900 R, converts 160 Btu of it to work, and rejects the rest as waste heat to a sink a...

Q: In tropical climates, the water near the surface of the ocean

In tropical climates, the water near the surface of the ocean remains warm throughout the year as a result of solar energy absorption. In the deeper parts of the ocean, however, the water remains at a...

Q: It is claimed that the efficiency of a completely reversible heat engine

It is claimed that the efficiency of a completely reversible heat engine can be doubled by doubling the temperature of the energy source. Justify the validity of this claim.

Q: Balloons are often filled with helium gas because it weighs only about

Balloons are often filled with helium gas because it weighs only about one-seventh of what air weighs under identical conditions. The buoyancy force, which can be expressed as Fb = ρairgVba...