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Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag
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Consider the four cases of a heat engine in 5.34 and

Chapter 5, Problem 42HP

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QUESTION:

Problem 42HP

Consider the four cases of a heat engine in Problem 5.34 and determine if any of those are perpetual machines of the first or second kind.

Problem 5.34

For each of the cases below, determine if the heat engine satisfies the first law (energy equation) and if it violates the second law.

a. ˙Q H = 6 kW, ˙QL = 4 kW, ˙W = 2 kW

b. ˙Q H = 6 kW, ˙QL = 0 kW, ˙W = 6 kW

c. ˙Q H = 6 kW, ˙QL = 2 kW, ˙W = 5 kW

d. ˙Q H = 6 kW, ˙QL = 6 kW, ˙W = 0 kW

Questions & Answers

QUESTION:

Problem 42HP

Consider the four cases of a heat engine in Problem 5.34 and determine if any of those are perpetual machines of the first or second kind.

Problem 5.34

For each of the cases below, determine if the heat engine satisfies the first law (energy equation) and if it violates the second law.

a. ˙Q H = 6 kW, ˙QL = 4 kW, ˙W = 2 kW

b. ˙Q H = 6 kW, ˙QL = 0 kW, ˙W = 6 kW

c. ˙Q H = 6 kW, ˙QL = 2 kW, ˙W = 5 kW

d. ˙Q H = 6 kW, ˙QL = 6 kW, ˙W = 0 kW

ANSWER:

Solution 42 HP:

Step 1 of 1:-

Here we have to find, which one of the given perpetual machines belong to 1st kind or 2nd kind.

The 1st kind of perpetual machines violate the 1st law of thermodynamics.

The 2nd kind of perpetual machines violate the 2nd law of thermodynamics.

a)

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