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Chapter 21: Q.18 (page 595)

At what pressure ratio tyyuudoes a Brayton cycle using a monatomic gas have an efficiency of 50 ?

Short Answer

Expert verified

rytiu

Step by step solution

01

 Introduction

We know that for a refrigerator, the heat added to the environment is equal to the sum of the work done and the heat extracted from the cold reservoir. That is,

Qh=W+Qc Q+ W

where W is the total work. This work will therefore be

$$

W=119-78=\underline{41 . J}

$$

Knowing the heat released in the heat reservoir, we can find the heat extracted as

$$

Q_{c}=Q_{h}-W

$$

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Most popular questions from this chapter

A refrigerator using helium gas operates on the reversed cycle shown in FIGURE. What are the refrigerator鈥檚 (a) coefficient of performance and (b) power input if it operates at 60cycles per second?

A Carnot refrigerator operates between reservoirs at -20掳Cand 50掳Cin a 25掳Croom. The refrigerator is a 40cm脳40cm脳40cmbox. Five of the walls are perfect insulators, but the sixth is a 1.0-cm-thick piece of stainless steel. What electric power does the refrigerator require to maintain the inside temperature at -20掳C?

A Carnot engine operates between temperatures of 5掳Cand 500掳C. The output is used to run a Carnot refrigerator operating between -5掳C and 25掳C. How many joules of heat energy does the refrigerator exhaust into the room for each joule of heat energy used by the heat engine?

In Problems 65through 68you are given the equation(s) used to solve a problem. For each of these, you are to

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

b. Finish the solution of the problem.

4.0=QC/Win

QH=100J

Which, if any, of the heat engines in FIGURE EX 21.22 violate (a) the first law of thermodynamics or (b) the second law of thermodynamics? Explain.
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