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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 畏1>畏2

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,畏1>畏2

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Most popular questions from this chapter

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?

FIGURE Q21.4 shows the pV diagram of a heat engine. During which stage or stages is (a) heat added to the gas,(b) heat removed from the gas, (c) work done on the gas, and (d) work done by the gas?

A heat engine using a monatomic gas follows the cycle shown in FIGURE P21.58.

a. Find Ws,Q, and 螖贰thfor each process in the cycle. Display your results in a table.

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

Do the energy-transfer diagrams inFIGUREQ21.8represent possible heat engines? If not, what is wrong?

The ideal gas in a Carnot engine extracts 1000Jof heat energy during the isothermal expansion at 300掳C. How much heat energy is exhausted during the isothermal compression at50掳C?
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