Answer the following questions. Justify your answers. (a) The efficiency of powe

Question

Answer the following questions. Justify your answers.

(a) The efficiency of power producing systems such as hydroelectric plants and solar

panels is limited by the Kelvin-Planck statement. Is this claim correct? Why or why not?

(b) A heat pump violates the Clausius statement because heat is transferred from cold

reservoir to hot reservoir. Is this claim correct? Why or why not?

(c) When heat is rejected from a constant mass system during a process, the change in

entropy of the system must be negative. Is this claim correct? Why or why not?

(d) A manufacturer claims to have built an electric resistance heater consuming 5 kWh of

electricity and providing 5 kWh of heat to a room during winter. Is this claim correct?

Why or why not?

Explanation / Answer

a. True

No heat engine can have a thermal efficiency of 100 percent, or as for a power plant to

operate, the working fluid must exchange heat with the environment as well as the

furnace.

b. False.

heat pump doesn't violate. It transfer heat from cold body to hot body by using work input.

c. False.

d. False .resistance heater can't have a efficinecy of 100%.

but a heat pump can consume 5Kwh and provide more heat than 5kwh.

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