Fundamentals of Chemical Engineering Thermodynamics (MindTap Course List)
Fundamentals of Chemical Engineering Thermodynamics (MindTap Course List)
1st Edition
ISBN: 9781111580704
Author: Kevin D. Dahm, Donald P. Visco
Publisher: Cengage Learning
Question
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Chapter 4.8, Problem 32P

(A)

Interpretation Introduction

Interpretation:

The change in entropy of the universe

Concept Introduction:

Write the expression for entropy.

dS=dQrevT

Here, the house temperature is T and change in the reversible heat is dQrev.

Write the expression to calculate the change in entropy of the universe.

ΔSuniverse=ΔSsystem+ΔSsurroundings

Here, entropy of the system is ΔSsystem and entropy of the surrounding is ΔSsurroundings.

(B)

Interpretation Introduction

Interpretation:

Is any heating system required to maintaining this house at 70°F.

(C)

Interpretation Introduction

Interpretation:

The efficiency of Carnot heat engine and the net work done on the system.

Concept Introduction:

Write the expression to determine the efficiency of Carnot heat engine.

ηH.E=(1TCTH)×100%

Here, temperature of heat sink is TC and temperature of heat reservoir is TH.

Write the efficiency of Carnot heat engine.

ηH.E=WnetQadded|Wnet|=ηH.E×Qadded

Here, heat added to the system is Qadded and net work done on the system is Wnet.

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