Refrigeration Flashcards
Which section of piping is “A” in the image below reffered to as?
Discharge line
Which section of piping is “B” in the image below reffered to as?
Liquid line
Which section of piping is “C” in the image below reffered to as?
Suction line
What state is the refrigerant in the condensor coil?
Saturated
What state is the refrigerant in the evaporator coil?
Saturated
What state ideally is the refrigerant at “A” in the image below?
Vapour
What state ideally is the refrigerant at “B” in the image below?
Liquid
What state ideally is the refrigerant at “C” in the image below?
Vapour
What is the maximum temperature drop you can have across a filter drier?
3°f
What is the purpose of an accumulator?
To prevent liquid refrigerant from entering the compressor.
What is the ideal amount of superheat in a system?
10°f of superheat
What is the ideal amount of subcooling in a system?
10°f of subcooling
What is the ideal SST (Saturated suction temperature)
35°f - 45°f
How do you calculate subcooling?
SCT - Liquid line temperature
For example
SCT - 95°f
Liquid line temperature - 85°f
Subcooling: 95 - 85 = 10
How do you calculate superheating?
Suction line temp - SST
For example
SST - 40°f
Suction line temperature - 55°f
Superheating: 55 - 40 = 15
Saturated means …
Boiling
The slower the fan speed the —– the temp drop but the —– you will boil the refrigerant.
higher/lower
more/less
higher the temp drop but the less you will boil the refrigerant
How do we know we have %100 liquid going to the TXV
By having 10°f of subcooling
What is wrong with the system pictured?
Fan speed to high.
What is wrong with the system pictured?
Fan speed to low.
What is wrong with the system pictured?
Nothing.
What is wrong with the system pictured?
It is low on charge