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 20P

(A)

Interpretation Introduction

Interpretation:

The temperature of the nitrogen leaving the valve.

(B)

Interpretation Introduction

Interpretation:

The physical state of the nitrogen leaving the valve.

Concept Introduction:

Write the expression to calculate the specific enthalpy of the mixture.

H^mix=qH^V+(1q)H^L

Here, the physical state of the nitrogen leaving the valve is q, specific enthalpy of liquid and vapor are H^L and H^V respectively.

(C)

Interpretation Introduction

Interpretation:

The entropy is generated in the valve.

Concept Introduction:

Write the entropy balance for an adiabatic, steady state process.

0=m˙inS^inm˙outS^out+S˙gen

Here, mass flow rate for inlet and exit state are m˙in and m˙out respectively, rate of entropy generation is S˙gen.

(D)

Interpretation Introduction

Interpretation:

Irreversible features for this process.

(E)

Interpretation Introduction

Interpretation:

The physical state of the methane leaving the valve, quality, and the entropy is generated in the valve.

Concept Introduction:

The entropy balance for an adiabatic, steady state process.

0=m˙inS^inm˙outS^out+S˙gen

Here, mass flow rate for inlet and exit state are m˙in and m˙out respectively, rate of entropy generation is S˙gen.

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