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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

In going fromito localid="1648790171714" fin each of the three processes of FIGURE Q21.1, is work done by the system localid="1648790168795" W<0,Ws>0is work done on the system , or is no net work done on the system localid="1648790176001" W>0,Ws<0or is no net work done?

The first and second laws of thermodynamics are sometimes stated as "You can't win" and "You can't even break even." Do these sayings accurately characterize the laws of thermodynamics as applied to heat engines? Why or why not?

A Carnot heat engine and an ordinary refrigerator with coefficient of performance 2.00operate between reservoirs at 350Kand 250K. The work done by the Carnot heat engine drives the refrigerator. If the heat engine extracts 10.0J of energy from the hot reservoir, how much energy does the refrigerator exhaust to the hot reservoir?

A refrigerator requires 200Jof work and exhausts 600Jof heat per cycle. What is the refrigerator’s coefficient of performance?

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