Fundamentals Of Chemical Engineering Thermodynamics
Fundamentals Of Chemical Engineering Thermodynamics
1st Edition
ISBN: 9781111580711
Author: Kevin D. Dahm, Donald P. Visco, Jr.
Publisher: CENGAGE L
Question
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Chapter 1.6, Problem 9E

A)

Interpretation Introduction

Interpretation:

Change in volume of the system at given pressure and temperature.

Concept introduction:

Thermodynamic property tables:

Thermodynamic property tables is provide the data about pressure, temperature, , specific enthalpy and entropy and specific volume at particular saturation pressure or saturation temperature or both are combined in superheat condition.

The change in volume (ΔV).

ΔV=M(V^2V^1)

Here, the mass of steam is M, volume of the final state is V^2 and volume of the initial state is V^1.

A)

Expert Solution
Check Mark

Explanation of Solution

Refer the Appendix A-3, “Superheated steam table”, obtain the following properties of the steam at initial pressure and temperature as 2bar and 200°C respectively.

The specific volume for initial state is V^1@200°C=1.080m3/kg

Refer the Appendix A-3, “Superheated steam table”, obtain the following properties of the steam at final pressure and temperature as 5bar and 350°C respectively.

The specific volume for final state is V^2@350°C=0.570m3/kg.

Calculate the change in volume (ΔV).

ΔV=M(V^2V^1)        (1)

Here, the mass of steam is M.

Substitute 50 kg for M, 1.080m3/kg for V^1, and 0.570m3/kg for V^2 in Equation (1).

ΔV=50kg(0.570m3/kg1.080m3/kg)=25.5m3

Here, negative sign indicates that the volume is leaving the system.

Thus, the change in volume (ΔV) is 25.5m3_.

B)

Interpretation Introduction

Interpretation:

Change in volume of the system at given pressure and temperature.

Concept introduction:

Thermodynamic property tables:

Thermodynamic property tables is provide the data about pressure, temperature, , specific enthalpy and entropy and specific volume at particular saturation pressure or saturation temperature or both are combined in superheat condition.

The change in volume (ΔV).

ΔV=M(V^2V^1)

Here, the mass of steam is M, volume of the final state is V^2 and volume of the initial state is V^1.

B)

Expert Solution
Check Mark

Explanation of Solution

Refer the Appendix A-4, “Compressed Liquid table”, obtain the following properties of the steam at initial pressure and temperature as 100bar and 300°C respectively.

The volume at the initial state is V^1@300°C=0.001398m3/kg.

Refer the Appendix A-4, “Compressed Liquid table”, obtain the following properties of the steam at final pressure and temperature as 5bar and 300°C respectively.

The volume at the final state is V^2@300°C=0.523m3/kg.

Calculate the change in volume (ΔV).

ΔV=M(V^2V^1)        (2)

Substitute 100 kg for M, 0.001398m3/kg for V^1, and 0.523m3/kg for V^2 in Equation (2).

ΔV=M(V^2V^1)=100kg(0.523m3/kg0.001398m3/kg)=52.16m3

Thus, the change in volume (ΔV) is 52.16m3_.

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