Energy Balance Flashcards
(9 cards)
1
Q
Main forms of energy
A
Kinetic Potential Enthalpy Heat Work
Mechanical, magnetic, surface stress energies
Electrical energy
2
Q
System has a turbine or an engine
A
Work will be done by the system outside by means of a shaft
3
Q
System has a pump
A
Work from outside should be done on the equipment by means of a shaft
4
Q
Control surface
A
Boundaries of the equipment
Cross section of the shafts and I let and outlet ports
5
Q
Control volume
A
Spaced enclosed by the control surface
6
Q
Q = +ve
A
When heat flows from outside into the equipment
7
Q
Q=-ve
A
Heat flows from the equipment to outside
8
Q
W=+ve
A
Work is done by the equipment outside like a turbine
9
Q
W=-ve
A
Work has to be supplied to the quipment from outside
