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 21P

(A)

Interpretation Introduction

Interpretation:

The heat is added to the boiler per kilogram (Q˙/m˙) of entering Freon 22.

Concept Introduction:

Write the steady state energy balance equation for the boiler.

ddt{M(U^+V22+gh)}=[m˙in(H^in+Vin22+ghin)m˙out(H^out+Vout22+ghout)+W˙S+WEC+Q˙]

Here, total mass is M, specific internal energy is U^, velocity is V, time taken is t, acceleration due to gravity is g, height is h, initial mass flow rate is m˙in, initial specific enthalpy is H^in, initial velocity is Vin, initial height of the gas is hin, final mass flow rate is m˙out, final height of the gas is hout, rate at which shaft work is added to the system is W˙S, rate at which work is added to the system through expansion or contraction of the system is W˙EC, and rate at which heat is added to the system is Q˙.

(B)

Interpretation Introduction

Interpretation:

The flow rate (m˙) of Freon through the boiler.

Concept Introduction:

Write the expression to determine the flow rate (m˙) of Freon through the boiler.

m˙=Q˙(1Q˙/m˙)

Here, rate of heat addition is Q˙.

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