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Thermo. Chapter 2
Energy and the First Law of Thermodynamics
15
Mechanical Engineering
Undergraduate 2
02/01/2011

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Cards

Term
Kinetic Energy
Definition
A scalar quantity; 1/2 mv^2 ; 
Term
Gravitational Potential Energy
Definition
An extensive property of the body that can be modeled by PE = mg(delta)h
Term
Work
Definition
Work is done by a system on its surroundings if the sole effect on everything external to the system  could have been the raising of a weight.
Term

Sign convetion for work.

 

Definition

W>0 : work done by  the system

W<0 : work done on  the system

Term
Power
Definition
The rate of energy transfer by work
Term

internal energy

 

Definition
an extensive property of a system; represented by U
Term
Heat transfer
Definition
Term
Sign convention for heat transfer
Definition

Q > 0: heat transfer to the system.

Q > 0:  Heat transfer from the system.

 

Term
adiabatic
Definition
without  heat transfer
Term
First Law of Thermodynamics
Definition
Energy is conserved
Term
Energy Balance
Definition
shows that the energy transfer across the system boundary results in a change in one or more of the macroscopic energy forms.
Term
Thermodynamic Cycle
Definition

A sequence of processes that begins and ends at the same state.

 

Term
Power Cycle
Definition

A cycle in which delivers a net work transfer of energy to their surroundings during each cycle.

Term

Refrigeration Cycle

 

Definition
cools a refrigerated space or maintains the temperature within  a dwelling or other temperature below that of the surroundings.
Term
heat pump cycle
Definition
used to maintain the temperature within a building or other dwelling above that of the surrounding temperature or to provide heating for certain industrial processed that occur at elevated temperatures.
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