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Chapter 21: Q. 6 (page 593)

shows the thermodynamic cycles of two heat engines. Which heat engine has the larger thermal efficiency? Or

are they the same? Explain.

Short Answer

Expert verified

The thermal efficiency η1>η2

Step by step solution

01

Step :1 Introduction

A thermodynamic cycle is a linked series of thermodynamic processes that involve the passage of heat and work into and out of a system while varying pressure, temperature, and other state variables, and that eventually returns the system to its beginning condition.

The working fluid (system) may serve as a heat engine by converting heat from a heated source into productive work and disposing of the remaining heat to a cold sink while passing through a cycle.

02

Step :2 Explanation 

Since same amount of heat is being added but WOUT is more in case of engine 1 as loop encloses greater area, hence,η1>η2

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Most popular questions from this chapter

A nuclear power plant generates 3000MWof heat energy from nuclear reactions in the reactor’s core. This energy is used to boil water and produce high-pressure steam at 300°C. The steam spins a turbine, which produces 1000MWof electric power, then the steam is condensed and the water is cooled to 25°Cbefore starting the cycle again.

a. What is the maximum possible thermal efficiency of the power plant?

b. What is the plant’s actual efficiency?

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a. Write a realistic problem for which this is the correct equation(s).

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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.
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