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Baltimore Polytechnic Institute
Uniting Theory and PracticeRenewable matter & energy
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# Name1 Adams2 Anderson3 Arrington4 Banks5 Bell6 Bennett7 Carter8 Chambers9 Chen-Sue
10 Dix11 Eaddy12 Gousse Jr.
# Name13 Harris14 Haskins15 Jones16 Joyner17 Knauer18 Lewis19 Martin20 Missouri21 Pichardo22 Powell23 Quickley24 Sanchez-V.
# Name25 Smoot26 Staton27 Thompson28 Wilson29 Zywan
Period 7
Welcome Back Seniors!!!You are the class of 2014
◦Lead by exampleRoll CallSyllabusExpectations
Syllabus and PoliciesRead 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 EssayRenewable 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 EssayWhat 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 EssayExchange 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.
Matter and EnergyRenewable
Matter and EnergyThis 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 EnergySo what is a thermodynamic system?Thermodynamics - “the study of systems and energy
transfer”
Pressure CookerGas-fired Boiler
Geothermal Power PlantSystem – whatever we choose to study
Systems have a boundary and surroundings.
We could be talking about…
Matter and EnergySo what is a thermodynamic system?Thermodynamics - “the study of systems and energy
transfer”
We can choose to study all…
System – what we choose to study
Boundary – separates system from surroundings
Surroundings – everything outside of system
or some part…of a complex system.Always draw the system and its boundaries before starting any work!!!
Matter and EnergyLet’s practice drawing system boundaries…
Thermodynamics - “the study of systems and energy transfer”
What’s the boundary if I’m interested in the pressure drop of steam as it passes through the turbine?
What’s the boundary if we’re interested in the efficiency of the cooling tower?We’ve been asked to determine the efficiency of the entire geothermal power plant...what should our boundary be?
Matter and EnergyThere are two types of systems…Closed Systems – no mass crosses the
boundary
Open Systems – mass crosses the boundary
Thermodynamics - “the study of systems and energy transfer”
Matter and EnergyThere are two types of systems…Closed Systems – no mass crosses the boundaryOpen Systems – mass crosses the boundary
Thermodynamics - “the study of systems and energy transfer”
“Energy can cross the boundary of both open and closed systems.”
Energy in… Energy out…
Matter and EnergyHow do we describe systems?
Thermodynamics - “the study of systems and energy transfer”
Energy in… Energy out…
Property – a characteristic used to describe a system
What are some properties we could use to describe the system above?
MassVolume
TemperaturePressure
We’ve intentionally placed the properties above into two groups. Why do you think that is?
What’s common to the properties in each group? How would you measure each property?If we removed a small amount of mass from the system, which properties would you expect to change?
Matter and EnergyThere are two types of properties:Property – a characteristic used to describe a
system
1) Extensive – the whole equals the sum of its parts
Which set of properties are best described as extensive?
MassVolume
TemperaturePressure
2) Intensive – the whole is the same as any partEXTENSIVE INTENSIVE
Mass and Volume are both extensive properties.Temperature and Pressure are intensive properties.
Extensive properties usually use capital letters as symbols.Intensive properties usually use lower case letters as symbols.
Matter and EnergyProperty – a characteristic used to describe a
systemProperty 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 heatTemperature
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 volumeWhat type of property is
density, ρ?What type of property is energy, E?
IntensiveExtensive
Matter and EnergyProperty – a characteristic used to describe a
system
When an extensive property is made intensive by dividing by mass, we use a lowercase symbol and the prefix “specific”.
In general, an extensive property can be made intensive by dividing by the mass of the system.
Extensive Divide by Mass
Intensive
EnergyE
kilojoules, kJ
Energy/massE/m
kilojoules/kilogram
Specific Energye
kJ/kg
Matter and Energy
Homework:Return the signed agreement form attached to your syllabus.Study your notes!
Thermodynamics - “the study of systems and energy transfer”
HOMEWORKDefine the following properties:Specific volumeDensitySpecific gravity Humidity