[ILM] 102B Flashcards
changing a liquid to a vapour
absorbs heat
changing a vapour to a liquid
expels heat
2 main refrigeration cycles
- vapour compression cycle
- absorption cycle
Vapour compression has 2 meanings
- positive displacement
- centrifugal compression(non-positive displacement)
positive displacement
the process of using a moving piston to squeeze vapour in a cylinder
ex) reciprocating compressor
centrifugal compressor
(non-positive placement)
has a radial(impeller) wheel that moves vapours
Vapour compressor cycle
- Compressor - vapour pump
- Condenser - heat dissipation(소실) unit
- TXV - pressure reducer
- Evaporator - heat collector unit
Inside of condenser you see
- desuperheat
- saturation
- subcooling
5 compressor types
- Reciprocating
- Rotary - must have check valves
- Scroll - must have check valves
- Screw
- Centrifugal
What is a compressor
a vapour pump
what is a condenser
a heat exchanger(heat dissipating)
what is a metering device
a pressure reducer
a metering device can have an adjustable set point
True
what is an evaporator
a heat exchanger(heat collector)
kinetic energy
energy based on motion
potential energy
energy based on position
The amount of energy an object possesses depends on 2 factors:
material
physical size
latent heat causes
a change in state
sensible heat causes
a change in temperature
saturation point
a condition in which one substance has reached 100% saturation with a second substance, or with a different phase of the same substance
