Refrigeration Flashcards
Convert 32° F to °C.
32°F = 0 °C
When piping a refrigeration system which pipe should be insulated?
Suction Line
Define refrigeration
The process of transferring heat from a place it is not wanted to a place it is unobjectionable.
How many Btu are required to raise one gallon of water from -4 °F to 240°F.
What compressor has the fewest moving parts?
Scroll compressor
What is the purpose of the distributor on an evaporator coil?
To ensure reasonably uniform flow of refrigerant to each circuit.
Between which two points is desuperheating contained?
C-B
What state of matter should the refrigerant be leaving the evaporator coil?
Superheated Vapor
Name the 4 main components of a refrigeration system?
Compressor
Condenser
Metering device
Evaporator
Between which two points is the condenser contained?
E-B
Which side of a system is the receiver located, high or low pressure?
High side ( by condenser)
Between which two points is subcooling contained?
E-F
Where in a system should the sight glass be installed?
Liquid line
What is superheat
When a Vapor is heated above its boiling point.
Between which two points is the metering device contained?
E-F
How is net oil pressure found?
Subtract crankcase pressure from the oil pump discharge pressure.
I didn’t verify this. If it is wrong I’m just gonna get it wrong.
What is the purpose of a compressor in a refrigeration system?
Compresses the Vapor, acts as a pump for the system.
How is compressor superheated found?
The difference between the actual temp of refrigerant Vapor and the saturation temp.
Name 3 ways heat Is transferred.
Conduction
Convection
Radiation
Between which two pointsnis the compressor contained?
A-B
Name 2 general types of evaporators.
Flooded or Dry ( Direct Expansion)
Name name 2 types of flow through a water cooled condenser?
Counter flow and parallel flow.
Which type of flow in a water cooled condenser is the most efficient?
Counter flow
What happens to the capacity of a system when the suction pressure goes down?
It decreases
Convert -40 °C to °F
-40 × 9/5 + 32= -40
-40 x 9/5 = -72
-72 + 32 = -40
Between which two points is the evaporator contained
F-A
Between which two points is superheat contained?
F-G
Name 3 types of compressors
Centrifugal compressor
Scroll compressor
Reciprocating compressor
Hermetic compressor
Semi hermetic compressor
Convert 100°C to °F
212 °F
How many BTU’s are required to raise 1 ton of water from - 40 steam.
You use the exact same process but you replace the 8.33 lbs for weight with 2000lbs.
1 gallon of water weighs how many lbs?
8.33 lbs
As a refrigerant is compressed, the _________ and ___________ both rise.
Pressure and Tenperature
