ADIGRAT

UNIVERSITY
COLLEGE OF EGINEERING AND
TECHNOLOGY
Name of students ID No, Secttion
1.ttewte ggejdn 45557/07 03
2.mulll h/me 54453/07 03
3.
4.
5.

sumitted to Instructer ……….

LABORATORY PROJECT TO DESIGN AND
IMPLEMENT A PROCESS FOR THE
PRODUCTION OF
BEER
Stephanie Farrell, Robert P. Hesketh, and C. Stewart Slater
Chemical Engineering Department
Rowan University
201 Mullica Hill Road
Glassboro, New Jersey 08028-1701
Abstract
This paper describes a one-semester Freshman Engineering Clinic Course that is being
implemented at Rowan University in the Spring of 1999. The focal point of the course is a
laboratory project in which students investigate a process for the production of beer.
After a brief introduction to the brewing process and a comparative evaluation of
commercially
available beers, the students set out in teams to perform a hands-on, reverse-engineering
investigation of the fermentation process. Next, each team works on the design and
construction
of a brewing process. The teams implement their processes, and present their designs and
results
to the other groups. Finally, each group performs a comparison and evaluation of the
designs.
The brewing process is used to introduce freshman students to engineering fundamentals
related
to material balances and stoichiometry, fluid flow, heat and mass transfer, and biochemical
reactions. Through this project, several educational objectives are met: to develop creative
and
critical thinking, to introduce design principles, to provide hands on experience, to develop
teamwork and communication skills, and to stimulate enthusiasm for engineering.
 Introduction
Rowan University is pioneering a progressive and innovative Engineering program that uses
innovative methods of teaching and learning to prepare students better for a rapidly
changing and
highly competitive marketplace, as recommended by ASEE [1]. Key features of the program
include (i) multidisciplinary education through collaborative laboratory and course work;
(ii) teamwork as the necessary framework for solving complex problems;
(iii) incorporation of stateof-
the-art technologies throughout the curricula; and (iv) creation of continuous opportunities
for
technical communication [2]. The Rowan program emphasizes these essential features in an
eight-semester, multidisciplinary Engineering Clinic sequence that is common to the four
Engineering programs (Civil, Chemical, Electrical and Mechanical).
A two-semester Freshman Clinic sequence introduces all freshmen engineering students to
engineering at Rowan University. In the Freshman Clinic we immediately establish a hands-
on, active learning environment for the reason explained by scientist and statesman Benjamin

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 Franklin: “Tell me and I forget. Show me and I may remember. Involve me and I
understand.”
The first semester of the course focuses on multidisciplinary engineering experiments using
engineering measurements as a common thread. The theme of the second semester is the
reverse
engineering of a commercial product or process. Previous reverse engineering projects have
involved products such as automatic coffee makers [3, 4, 5], hair dryers and electric
toothbrushes
[6]. This paper describes our first effort to incorporate the design and reverse engineering of
a
process into our Freshman Clinic. We focus on the investigation of the beer production
process.
A project introduced in a three-week program sponsored by the National Science Foundation
in
1990 was the inspiration for this project. The program, Exploring Career Options in
Engineering
and Science at Stevens Institute of Technology, was designed to stimulate enthusiasm for
engineering and science among high school girls. The Chemical Engineering portion of this
program, in which students designed a process to produce beer, was met with overwhelming
excitement. The educational objectives of the design and reverse engineering project are to:
Foster creative thinking
Develop critical thinking
Introduce engineering, scientific, and design principles
Provide hands-on experience
Develop communications and teamwork skills
Stimulate enthusiasm for Engineering
 The Brewing Process
There are three major steps involved in the brewing process: mashing, boiling, and
fermentation.
Milled barley is fed to a mash tun where it is mixed with warm water and incubated for
approximately 20 minutes to 2 hours. During this time, some enzymes present in malted
barley
break down starches into fermentable sugars, and other enzymes break down proteins to form
amino acids. Sugars, proteins, amino acids, and vitamins are extracted from the barley to
form a
nutritionally complete wort. The solid barley is then separated from the liquid solution, which
is
then fed to a kettle and boiled with hops for about 15 - 30 minutes. Hops, the dried female
flowers of the hop plant, impart the characteristic bitter flavor to beer and have a
bactericidal
effect. Later they are removed by filtration from the liquid, which is then chilled and fed to
Malted Barley
Figure 1 Schematic representation of the brewing process showing the
major process steps
fermenter. After several days of fermentation, the product is beer. The brewing process is
shown in Figure 1.
The brewing process involves several engineering and science principles such as fluid flow,
heat
transfer, stoichiometry and material balances, and chemical reaction kinetics. Additionally,
topics such as material compatibility, engineering economics, electronics and circuits, and

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environmental issues are incorporated into the project. Table 1 shows some of these
principles
and topics, and some of the process steps to which they are applicable.
 The project structure
The laboratory project structure can be broken down into four components. Students begin by
investigating the final product through an evaluation of several types of commercially
available
beer. This gives students a perspective for the remainder of the project. Next, students
explore
some of the biochemical changes that take place during brewing by performing and
analyzing the
mashing and fermentation process steps. After a plant trip to a local microbrewery where
students see the brewing process in action, they design and build the equipment and
instrumentation for the brewing process (focusing on the mashing, boiling, chilling and
fermentation steps). The final phase of the project involves implementation and monitoring of
the process.
 Evaluation of Commercial Beer
Students begin by studying a commercially available version of the end product. They
perform
qualitative and quantitative analyses on several types of beer: An alcohol-free beer such as
O’Douls, a straw/gold pilsner such as Budweiser, an amber beer such as Bass Ale, and a
dark
beer such as Guinness Stout.
Each team of four students evaluates samples of each type of beer. Students begin by
observing
several properties of each product: the liquid level in the bottle; the bottle color; the sound
the
beer makes upon opening; the size and fullness of the head upon pouring; the head retention;
the
smell, color and apparent carbonation. The relevance of each of these properties is discussed
in
several texts [7, 8, 9, 10]. Next, the students quantitatively analyze several properties of each
type
of beer: they test head retention, alcohol content, sugar content, color, and pH.
Opening a can of Guinness Draught is an exciting experience, particularly for the
unsuspecting
student! The Guinness can contains a proprietary widget that induces the sudden and
dramatic
production of foam upon opening of the can. Guinness is pressurized with nitrogen and
carbon
dioxide; the nitrogen creates a very stable foam with tiny bubbles, as shown in Figure 2. It is
interesting to compare this foam to the foam on one of the other commercial beers, as the
difference in bubble size and foam retention are significant. After students cut open the can of
Guinness to discover the widget inside as shown in Figure 3, they must figure out how the
widget works. An observant student will discover that U.S. Patent number 4,832,968 is cited
on
the can -- this is the patent for the widget [11]. By reading the patent, students learn how the
widget works, and they are introduced to intellectual property rights in the brewing industry.
 How are barley and water converted to beer?

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Students perform mashing and fermentation to investigate some of the biochemical changes
that
occur to convert barley to beer. We start by making beer from a malt extract kit. Producing
beer
from a malt extract kit is very simple; the malt extract is heated and boiled for 15 minute the

transferred to a fermentation vessel (Erlenmeyer flask) and diluted with cool water before
yeast
is added. The fermentation process takes place over the next 8-14 days, with the most
vigorous
fermentation occurring within the first 3 days. Using the malt extract kit eliminates the
necessity
to perform several process steps before the fermentation, enabling students to focus on
understanding the fermentation step.
The first time the students implement the fermentation process, they evaluate the process
primarily through visual observation and try to answer several questions. Is there a color
change
in the liquid during the fermentation process? How long does it take the fermentation to
become
vigorous? What is the approximate duration of the vigorous fermentation? Is there evidence
of
yeast growth or turbidity during the process? Is the yeast distributed at the top, throughout,
or at
the bottom of the liquid? Does the yeast begin to settle at any time during the process? After
completion of the fermentation process, students analyze their beer using the qualitative and
quantitative methods described above.
Next the students investigate the mashing step. The mashing step immediately precedes
boiling
and fermentation in the brewing process, and it is the step that produces a nutritionally
complete
wort for fermentation. Students mash both malted barley and unmalted barley, and they
compare
the worts obtained from each type of barley. Analyses of the total extract and concentrations
of
fermentable sugars reveal that only the malted barley produces a wort containing
fermentable
sugars. The reason for this is that malted barley contains enzymes necessary to convert
starches
to fermentable sugars, and unmalted barley does not.
 Design of the Brewing Process Equipment
After performing the brewing process using standard laboratory
glassware, students begin to think about designing specialized
equipment for the brewing process. We begin by making a
field trip to the Iron Hill Restaurant and Brewery in West
Chester, PA, a microbrewery that produces 300-Gallon batches
of beer and uses seven different fermenters. Iron Hill’s mash
tun is shown in Figure 4. Mark Edelson, a co-owner of this
business who has extensive brewing experience, guides the

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students through the brewery, explaining the different process
steps. Mr. Edelson is a chemical engineer who gained
extensive experience in manufacturing before founding the
brewery. The students must note the important process
measurements taken at the brewery, and gather important
information about the equipment that will help them with the
design of their own brewing process.
Next the students design and build the equipment for the
mashing, boiling, chilling and fermentation process steps, working within a budget of $50.
They
may use or adapt items commonly available at department or hardware stores, but they may
not
use equipment specifically made for homebrewing.
There are several considerations for the design of the mashing equipment: how to maintain
the
desired temperature range for enzyme activity for the duration of the mashing process; how
to
remove the grist (spent barley grains) from the malt wort after mashing; and how to leach out
the
remaining sugars from the grist. Maintaining the temperature may be accomplished by
manual
on-off temperature control, or by using insulation. The grist may be removed by using a
strainer,
a pot with a “false bottom” such as a spaghetti pot, or by containing the grist in a mesh or
cloth
sack.
For the boiling and chilling steps, students must consider how to prevent the hops from
clogging
the system when draining the kettle (this is an issue if tubing is used in a gravity flow system).
Other considerations involve cooling the wort before the fermentation. Yeast cannot be added
until the temperature of the liquid is sufficiently low (below about 25 oC). As the wort cools, it
becomes susceptible to contamination. Thus it is desirable to cool the wort rapidly and
minimize
exposure to the atmosphere. Ideally, the wort is cooled by flow through tubing as it drains
from
the boiling kettle to the fermentation vessel; this minimizes the exposure to the atmosphere.
The
tubing may be submerged in a bucket of cool water, and the tubing must be long enough to
achieve the desired cooling. Cooling may be further enhanced by flowing cool water through
the
bucket.
For the fermentation process, consideration must be given to monitoring the biochemical
changes that take place as the yeast convert sugar to alcohol and carbon dioxide. This
reaction is
accompanied by a decrease in pH and an evolution of heat. A possible scenario for
monitoring
the fermentation process is shown in Table 3. In this scenario, the temperature, pH, sugar
concentration, alcohol concentration, and carbon dioxide evolution are measured; a more
indepth
investigation would include measurement of dissolved oxygen and biomass accumulation.

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  Implementation of the Brewing Process
The culmination of the project is the implementation of the brewing process. During the final
weeks of the process, students produce beer from malted barley using the process equipment
that
they design and built themselves. They monitor the fermentation as it proceeds to produce
ethanol and carbon dioxide from sugar, and collect data that reveals the progression of the
reaction.
 Evaluation of the Process Design
After the teams have implemented their process and product, they prepare written reports
and
present their results orally to the other teams. Each team must describe its process design
and
discuss how specific design considerations were addressed. They evaluate the strengths and
weaknesses of their design, and suggest possible modifications and improvements to the
process
and equipment. The teams then have an open discussion in which they compare and evaluate
the
designs of the other teams. The teams follow up with a written summary of these process
evaluations and comparisons.
 Summary
As the teams of students work through the various phases of this project, several educational
objectives are met. Students think creatively to make an original design for their brewing
process, and they use critical thinking to compare and evaluate their designs. They are
introduced to engineering design concepts that involve heat transfer and mass transfer when
they
design the mashing, boiling, and chilling equipment. Principles of stoichiometry, mass
balances,
and reaction kinetics are introduced via the fermentation process. Students gain hands-on
experience in building their own equipment, implementing the process, and monitoring the
fermentation. Communications skills are emphasized with the final oral reports, written
reports
and the discussion of designs afterwards. Based on the demonstrated success of the three-
week
brewing project we are optimistic that the semester-long brewing project at Rowan
University
will enjoy the same success as measured by students’ excitement and enthusiasm.
gas in solution, U.S. Patent Number
4,832,968, Arthur Guinness Son and Company Limited, May 23, 198
Stephanie Farrell is Associate Professor of Chemical Engineering at Rowan University. She received her B.S. in
1986 from the University of Pennsylvania, her MS in 1992 from Stevens Institute of Technology, and her Ph.D.
in
1996 from New Jersey Institute of Technology. After receiving her Bachelor's degree, she worked on the design
of
a needleless injector to be used by the World Health Organization in a worldwide measles eradication project.
She
also spent six months working at British Gas in London before returning to graduate school. Prior to joining
Rowan
in September, 1998, she was a faculty member in Chemical Engineering at Louisiana Tech University.
Stephanie's
laboratory development experience began at Stevens Institute of Technology, where she instructed the ECOES
summer program for high school students, sponsored by NSF. She is Acknowledgements
The American Society of Brewing Chemists was very helpful in providing information on

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methods of chemical analysis. We are also very grateful to Mark Edelson, co-owner of Iron
Hill
Brewery and Restaurant, for giving us a fascinating tour of West Chester, PA brewery. Loren
Lounsbury, owner of Beercrafters in Turnersville, NJ, provided invaluable suggestions and
advice on the brewing process.
References
1 Engineering Education for a Changing World, Joint project report by the Engineering Deans Council and
Corporate Roundtable of the American Society for Engineering Education, Washington, DC, 1994.
2 Rowan School of Engineering – A Blueprint for Progress, Rowan College, 1995.
3 Hesketh, R. and C. Stewart Slater, Demonstration of Chemical Engineering Principles to a Multidisciplinary
Engineering Audience, Proceedings of the 1997 Annual Conference of the American Society for Engineering
Education, Session 2513, June 15-18, 1997.
4 Marchese, A.J., R.P. Hesketh, K. Jahan, T.R. Chandrupatla, R.A. Dusseau, C.S. Slater, J.L. Schmalzel,
Design in the Rowan University Freshman Engineering Clinic, Proceedings of the 1997 Annual Conference
of the American Society for Engineering Education, Session 3225, June 15-18, 1997.
5 Hesketh, R.P., K. Jahan, Marchese, A.J., C.S. Slater, J.L. Schmalzel, T.R. Chandrupatla, R.A. Dusseau,
Multidisciplinary Experimental Experiences in the Freshman Engineering Clinic at Rowan University,
Proceedings of the 1997 Annual Conference of the American Society for Engineering Education, Session
2326, June 15-18, 1997.
6 Ramachandran, R., J. Schmalzel and S. Mandayam, Proceedings of the 1999 Annual Conference of the
American Society for Engineering Education, Session 2253, June 20-23, 1999.
7 Janson, L. W. , Brew Chem 101: The Basics of Homebrewing Chemistry, Storey Communications, Inc.,
Pownal, VT, 1996.
8 Papazian, C., The New Complete Joy of Home Brewing, Avon Books, New York, 1991.
9 Bamforth, C., Tap into the Art and Science of Brewing, Plenum Publishing Corp, New York, 1998.
10 Miller, D., The Complete Handbook of Homebrewing, Garden Way Publishing, Pownal, VT, 1992.
11 Beverage package and a method of packaging a beverage containing currently focusing efforts on
developing
laboratory experiments in heat transfer, process control, and biochemical and biomedical engineering at
Rowan.
Stephanie won the ASEE Outstanding Campus Representative Award in 1998, and she will serve as Newsletter
editor of the Mid-Atlantic Section of ASEE beginning in June, 1999.
C. Stewart Slater is Professor and Chair of Chemical Engineering at Rowan University. He received his B.S.,
M.S.
and Ph.D. from Rutgers University. Prior to joining Rowan he was Professor of Chemical Engineering at
Manhattan
College where he was active in chemical engineering curriculum development and established a laboratory for
advanced separation processes with the support of the National Science Foundation and industry. Dr. Slater's
research and teaching interests are in separation and purification technology, laboratory development, and
investigating novel processes for interdisciplinary fields such as biotechnology and environmental engineering.
He
has authored over 70 papers and several book chapters. Dr. Slater has been active in ASEE, having served as
Program Chair and Director of the Chemical Engineering Division and has held every office in the DELOS
Division. Dr. Slater has received numerous national awards including the 1999 Chester Carlson Award, 1999
and
1998 Joseph J. Martin Award, 1996 George Westinghouse Award, 1992 John Fluke Award, 1992 DELOS Best
Paper Award and 1989 Dow Outstanding Young Faculty Award.
Robert Hesketh is Associate Professor of Chemical Engineering at Rowan University. He received his B.S. in
1982
from the University of Illinois and his Ph.D. from the University of Delaware in 1987. After his Ph.D. he
conducted
research at the University of Cambridge, England. Prior to joining the faculty at Rowan in 1996 he was a
faculty
member of the University of Tulsa. Robert’s research is in the chemistry of gaseous pollutant formation and
destruction related to combustion processes. Nitrogen compounds are of particular environmental concern
because
they are the principal source of NOX in exhaust gases from many combustion devices. This research is focused
on

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first deriving reaction pathways for combustion of nitrogen contained in fuel and second to use these pathways
to
reduce NOX production. Robert employs cooperative learning techniques in his classes. His teaching
experience
ranges from graduate level courses to 9th grade students in an Engineering Summer Camp funded by the NSF.
Robert’s dedication to teaching has been rewarded by receiving several educational awards including the 1999
Ray
W. Fahien Award, 1998 Dow Outstanding New Faculty Award, the 1999 and 1998 Joseph J. Martin Award, and
four teaching awards.

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