Baltimore Polytechnic Institute
Renewable matter & energy
Uniting Theory and Practice
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Gousse Jr.
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Period 7
Welcome Back Seniors!!!

You are the class of 2014
◦ Lead by example
Roll Call
 Syllabus
 Expectations

Syllabus and Policies

Read over the syllabus for this class
◦ You must return the signed acknowledgment
form as homework for tomorrow

Policies
◦
◦
◦
◦
◦
Start of Class
Dress Code
Behavior
Coach Class
Disciplinary Actions
Renewable Energy Essay

Renewable energy is topic of debate in
today’s society and engineering is right in
the middle of it. Many people feel we are
close to damaging the Earth, permanently,
because of our current consumption of
non-renewable energies. Others argue
that the Earth has always gone through
cycles similar to what is presently
occurring…
Renewable Energy Essay

What do you think?
◦ (15 mins) Explain your point of view on
renewable energy in three paragraphs
(Introduction, Argument, Conclusion)

(5 mins) Reinforce your argument with
supporting data.
◦ You may use your cell phones to search the
web for information
Renewable Energy Essay

Exchange essays with your partner
◦ (5 mins) Read and critique your partner’s essay






Did they follow the format? (Intro., Arg., Concl.)
Were there any misspellings or grammar errors?
Any logical inconsistencies?
Did they attempt to persuade the reader?
How could they have been more compelling?
(15 mins) Read your partner’s essay aloud.
Drill:
Friday, 1/24/13
Answer in your own words…
What is the meaning of Thermodynamics?
 What is a thermodynamic system?

Drill:
Wednesday, 9/18/13
Answer in your own words…

List all of the types of renewable energy with
which you are familiar.
Renewable
Matter and Energy
Matter and Energy
This course is an introduction to the study of
thermodynamics and an investigation of how it can
be applied to renewable and non-renewable energy
sources.
Thermodynamics comes from the Greek words:
therme (heat) + dynamis (force)
=
Thermodynamics
“the study of systems and energy transfer”
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
So what is a thermodynamic system?
We could be talking about…
Pressure Cooker
Gas-fired Boiler
System – whatever we choose to study
Systems have a boundary and surroundings.
Geothermal Power Plant
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
So what is a thermodynamic system?
System – what we choose to study
Boundary – separates system from surroundings
Surroundings – everything outside of system
Always
thetosystem
or some part…
before starting any work!!!
We candraw
choose
study and
all…its boundaries
of a complex system.
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
Let’s practice drawing system boundaries…
We’ve been
What’s
the boundary
asked to determine
if we’re
I’m interested
interested
the efficiency
in the
in the
pressure
ofefficiency
the entire
drop
ofof
steam
the
geothermal
cooling
as it passes
tower?
powerthrough
plant...what
the turbine?
should our boundary be?
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
There are two types of systems…
Closed Systems – no mass crosses the
boundary
Open Systems – mass crosses the boundary
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
There are two types of systems…
Closed Systems – no mass crosses the boundary
Open Systems – mass crosses the boundary
“Energy can cross the boundary of both
open and closed systems.”
Energy in…
Energy out…
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
How do we describe systems?
Property – a characteristic used to describe a system
Temperature
Pressure
Mass
Volume
Energy in…
Energy out…
IfHow
What
We’ve
What’s
we removed
are
intentionally
common
some
small
to placed
theamount
properties
the
we of
properties
could
mass
in use
each
from
to
above
group?
describe
the system,
into
would
youa properties
measure
each
property?
the system
two
which
groups.
properties
above?
Why would
do youyou
think
expect
that is?
to change?
Matter and Energy
Property – a characteristic used to describe a system
There are two types of properties:
1) Extensive – the whole equals the sum of its parts
2) Intensive – the whole is the same as any part
EXTENSIVE
Mass
Volume
INTENSIVE
Temperature
Pressure
Extensive
properties
usually
use
capital
lettersasas symbols.
Whichand
Mass
set
Volume
of properties
are
both
are
extensive
best
described
properties.
Intensive
properties
usually use
case properties.
letters as
extensive?
Temperature
and Pressure
arelower
intensive
symbols.
Matter and Energy
Property – a characteristic used to describe a system
Property
Symbol Definition
Mass
m
measure of the amount of material present
Volume
V
amount of space occupied by an object
Energy
E
the ability to do work or produce heat
Temperature
T
measure of the molecular activity of a
substance
Pressure
P
force exerted per unit area on the boundaries
of a substance
Density
ρ
the total mass of a substance divided by the
total volume
What type of property is density, ρ?
What type of property is energy, E?
Intensive
Extensive
Matter and Energy
Property – a characteristic used to describe a system
In general, an extensive property can be made intensive by
dividing by the mass of the system.
Extensive
Divide by Mass
Intensive
Energy
E
kilojoules, kJ
Energy/mass
E/m
kilojoules/kilogram
Specific Energy
e
kJ/kg
When an extensive property is made intensive by
dividing by mass, we use a lowercase symbol and the
prefix “specific”.
Matter and Energy
Thermodynamics - “the study of systems and energy transfer”
Homework:
Return
the signed agreement form attached
to your syllabus.
Study your notes!
HOMEWORK
Define the following properties:
 Specific volume
 Density
 Specific gravity
 Humidity
