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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 Carnot heat engine operates between reservoirs at 182掳Cand 0掳C. If the engine extracts 25Jof energy from the hot reservoir per cycle, how many cycles will it take to lift a 10Kg mass a height of 10m?

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?

FIGURE P21.35 shows a heat engine going through one cycle. The gas is diatomic. The masses are such that when the pin is removed, in steps 3and 6, the piston does not move.

a. Draw the p-vdiagram for this heat engine.

b. How much work is done per cycle?

c. What is this engine鈥檚 thermal efficiency?

A heat engine using 120mgof helium as the working substance follows the cycle shown in FIGURE P21.61.

a. Determine the pressure, temperature, and volume of the gas at points 1,2, and 3.

b. What is the engine's thermal efficiency?

c. What is the maximum possible efficiency of a heat engine that operates between TmaxandTmin?

The cycle of FIGURE EX 21.10consists of four processes. Make a table with rows labeled Ato Dand columns labeled 鈭�Eth, Ws, and Q. Fill each box in the table with +,-, or 0to indicate whether the quantity increases, decreases, or stays the same during that process.
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