ChBE 321 Homework 1
(due 1/31 by the first ten minutes of discussion)
1. A gas is confined in a 0.57-m-diameter cylinder by a piston, on which rests a weight. The
mass of the piston and weight together is 125 kg. The local acceleration of gravity is 9.813
ChBE 321
Spring 2015
Homework 3
Due Friday, February 13, 2015
(10)
1. Efficiency of a gas blower
An ideal gas (Cv = 20.8 kJ/kmolK) passes through a centrifugal blower at a rate of 2.5 kmol/s,
where it is compressed adiabatically from 1.1 to 2.7 atm. The g
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Note: This problem was done with
a steam table. We would not expect
such precise values when reading a T-S
diagram on a test.
Also, the sign convention for
Work is reversed fr
1.
The general energy balance is shown below:
U+PE+KECV=H+PE+KEFS+QWs
For each of the following problem statements, write the simplified energy balance using the
variables given if applicable. Make sure to draw or state explicitly what the control volume
ChBE 321
Spring 2015
Homework 1
Due Friday, January 30, 2015
(10)
1. Mass balances: the semibatch reactor
In chemical reaction engineering, an important type of reactor for certain applications is the
semibatch reactor. It can take several forms, but a co
ChBE 321
Spring 2015
Homework 2
Due Friday, February 6, 2015
(5)
1. Power to a gas blower
An ideal gas (Cv = 20.8 kJ/kmolK) passes through a centrifugal blower at a rate of 2.5 kmol/s,
where it is compressed adiabatically from 1.1 to 2.7 atm. The gas ente
ChBE 321 Spring 2015
Homework 2
SOLUTIONS
g 1. Power to a gas blower
An ideal gas (C, = 20.8 kJ/kmol-K) passes through a centrifugal blower at a rate of 2.5 kmol/s, where it is
compressed adiabatically from 1.1 to 2.7 atm. The gas enters the blower at 25°
ChBE 321 Spring 2015
Homework 3
SOLUTIONS
% 1. Efﬁciency of a gas blower
An ideal gas (C.lr = 20.8 kJ/kmoloK) passes through a centrifugal blower at a rate of 2.5 kmol/s, where it is
compressed adia batically from 1.1 to 2.7 atm. The gas enters the blower
1.
a.
The first step is solving for the saturation pressures of the two components at 200 C. To do so we can
plug into Antoines equation:
For ethanol:
For water:
As always it is important to be able to think about this critically. These pressures are quit
ChBE 321 Discussion 14 25 April 2013
Practice Problems
1. A Carnot engine operates between the temperatures l000 F and 50 F, producing
120 Btu of work. Calculate the heat input to the engine.
2. A Rankine Power Production Cycle is shown below. Your boss h
Practice Exam 2
Please note that this exam does not necessarily reflect the length or difficulty level of Hour Exam 2. Use
these examples to check your understanding and practice problem solving independently!
1.
The following question will explore the ut