
Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 1, Problem 5RQ
To determine
The simplest method for starting a motor among all starting methods.
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A gas mixture with a molar analysis of 40% CH4 (methane) and 60% air enters a control volume operating at steady state at location 1
with a mass flow rate of 5 kg/min, as shown in the figure below. Air enters as a separate stream at 2 and dilutes the mixture. A single
stream exits with a mole fraction of methane of 5%. Assume air has a molar analysis of 21% O2 and 79% N2.
(CH4, Air)
m₁ =
= 5 kg/min
Air
(21% O2, 79% N₂)
3
+
(5% CH4, 95% Air)
A gas mixture with a molar analysis of 40% CH4 (methane) and 60% air enters a control volume operating at steady state at location 1
with a mass flow rate of 5 kg/min, as shown in the figure below. Air enters as a separate stream at 2 and dilutes the mixture. A single
stream exits with a mole fraction of methane of 5%. Assume air has a molar analysis of 21% O2 and 79% N2.
(CH4, Air)
m₁ =
= 5 kg/min
Air
(21% O2, 79% N₂)
3
+
(5% CH4, 95% Air)
Argon (Ar), at T₁
=
350 K, 1 bar with a mass flow rate of m₁
3 kg/s enters the insulated mixing chamber shown in the figure below
and mixes with carbon dioxide (CO2) entering as a separate stream at 575 K, 1 bar with a mass flow rate of 0.5 kg/s. The mixture exits
at 1 bar. Assume ideal gas behavior with k = 1.67 for Ar and k = 1.25 for CO2.
Argon (Ar)
P₁ = 1 bar
mT
For steady-state operation, determine:
(a) the molar analysis of the exiting mixture.
(b) the temperature of the exiting mixture, in K.
(c) the rate of entropy production, in kW/K.
Insulation
3
+
Mixture
exiting
P3 = 1 bar
2+ Carbon dioxide (CO2)
T₂ = 575 K
P2 = 1 bar
m2 = 0.5 kg/s
Chapter 1 Solutions
Industrial Motor Control
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