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Chapter 21: Q. 5 (page 593)

Rank in order, from largest to smallest, the thermal efficiencies 畏1to 畏4of the four heat engines in FIGURE Q21.5. Explain.

Short Answer

Expert verified

Rank in order from largest to smallest畏3>畏2=畏1>畏4

Step by step solution

01

Step :1 Introduction 

The Carnot engine is the most efficient of any heat engine that operates between two temperatures.

Heat pumps take heat from a cold place and transport it to a warmer one in the opposite direction of spontaneous heat transfer; nevertheless, a refrigerator is a piece of household equipment that is kept at a lower temperature than the outside air.

02

Step :2 Explanation 

Use畏=Wout/Qinto get ,

畏1=0.4畏2=0.4

畏3=0.6畏4=0.06

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Most popular questions from this chapter

A heat engine does 200Jof work per cycle while exhausting 400Jof waste heat. What is the engine鈥檚 thermal efficiency?

A Carnot refrigerator operating between -20掳Cand+20掳Cextracts heat from the cold reservoir at the rate200J/s. What are (a) the coefficient of performance of this refrigerator, (b) the rate at which work is done on the refrigerator, and (c) the rate at which heat is exhausted to the hot side?

The coefficient of performance of a refrigerator is6.0 . The refrigerator's compressor uses 115Wof electric power and is 95%efficient at converting electric power into work. What are (a) the rate at which heat energy is removed from inside the refrigerator and (b) the rate at which heat energy is exhausted into the room?

A heat engine using 1.0 mol of a monatomic gas follows the cycle shown in FIGURE P21.55. 3750 J of heat energy is transferred to the gas during process 1 -> 2.
a. Determine Ws, Q, and 螖贰th for each of the four processes in this cycle. Display your results in a table.
b. What is the thermal efficiency of this heat engine?

A heat engine using a diatomic gas follows the cycle shown in FIGURE P21.56. Its temperature at point 1is 20掳C.

a. Determine Ws,Q, and 螖贰thfor each of the three processes in this cycle. Display your results in a table.

b. What is the thermal efficiency of this heat engine?

c. What is the power output of the engine if it runs at 500rpm?
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