Consider a heat engine and heat pump connected as shown in

Chapter 5, Problem 41HP

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QUESTION:

Problem 41HP

Consider a heat engine and heat pump connected as shown in Fig. P5.41. Assume that TH1 = TH2 > Tamb and determine for each of the three cases if the setup satisfies the first law and/or violates the second law.

FIGURE P5.41

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QUESTION:

Problem 41HP

Consider a heat engine and heat pump connected as shown in Fig. P5.41. Assume that TH1 = TH2 > Tamb and determine for each of the three cases if the setup satisfies the first law and/or violates the second law.

FIGURE P5.41

ANSWER:

Solution 41 HP:

Step 1 of 3:-

Here we have to check, whether the 3 situations satisfy 1st law of thermodynamics or violates the 2nd law of thermodynamics.

The assumption is,

.

From the given table,

a)

This satisfies the 1st law and 2nd law both.

Energy is conserved according to,

.

The entropy will increase.

.

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