1b Flashcards
Types of K.E. motion
Translations
Rotations
Vibrations
Where are positive and negative charges found in regards to the nucleus?
Positive- in the nucleus
Negative- around the nucleus
Does a change in bonding change the potential energy?
Yes
What does bonding theory show changes potential energy?
- Phase changes (intermolecular bond changes)
2. reactions (intramolecular bond changes)
Factors that affect the rate of thermal energy transfer?
- Distance from thermal eq (when distance increases, thermal transfer increases(Joules/sec))
- Surface area (more =more)
Explain
W=-P(ext)🔼V
-p external multiplied by delta v
W - is the amount of work transferred
🔼V - the change in volume
P(ext) - external pressure
Which of these values is a state function?
🔼E = q+w
🔼E
How do you calculate the efficiency of something
Efficiency = transferred desired energy / energy paid for
=what you wanted / what you paid for it
Define exergy
Exergy efficiency = 100 * ( w actual / w max)
What is the difference between exergy efficiency and energy efficiency
Exergy is how close the amount of work is to the max work .
Energy efficiency is how much work you got vs how much you paid for
Define adiabatic
An adiabatic change is one where q=0. We can force a change to be a change to be adiabatic by insulting it
Equation for obtaining explosive work max
=delta h (1 - (T cold / T hot)
Two ways of increasing the temp of a gas?
- Increase p
2. Heat gas
Would Energy transferred as heat at constant pressure be the same as if you calculated delta h using delta h formations? Why or why not?
Yes because qp = delta H
4 strokes of a gasoline engine?
- Intake
- Compression
- Combustion
- Exhaust
Are compressor blades in front of the combustion chamber or after?
In front
On jet planes is the combustion steady or intermittent
Steady
What is required to generate an electrical current
Rotating elections which create an election flow
Inputs of a gas turbine?
- air
2. Natural gas / liquid fuel
What is the heart of a gas turbine power plant?
The gas turbine
What happens to temp when air is compressed?
Increases
Is fuel injected before or after the compression of air in a gas turbine?
After
Where is the chemical energy converted to mechanical energy in a gas turbine?
When the turbine blades are forced to spin
What makes a drive shaft rotate
The expanding gas
What do you need to turn mechanical energy of the generator drive shaft into electrical energy?
A magnet surrounded by copper wire
What design feature improved the efficiency of the gas turbine gaining 50% more power?
Combined cycle power plant
