subcooling

[danko101]

I have a question about subcooling. I have been studying hvac books to memorize subcooling,superheat, etc. And I read that subcooling is temp of a substance below its saturation point, which with ref would be a liquid state.
But the other day my sgt asked me if the compressor was getting subcooling back, to cool it off. I thought that subcooling occured in the condensor and super heat in the evap. If that is true why would the comp be getting subcooling back and how does the comp actually cool off. This may sound confusing and for that I apologize. If anyone can help it would be greatly appreciated.


Danko

[BaldLoonie]

I'm confused too!

Cool refrigerant vapor does cool the compressor motor. Not sure about his terminology of getting subcooling back :confused:

[smokin68]

Sgt has his terms wrong, but of course sgt is right, so the answer is check the s/h and tell him yes.:)

[icecuber911]

Originally posted by danko101
I have a question about subcooling. I have been studying hvac books to memorize subcooling,superheat, etc. And I read that subcooling is temp of a substance below its saturation point, which with ref would be a liquid state.
But the other day my sgt asked me if the compressor was getting subcooling back, to cool it off. I thought that subcooling occured in the condensor and super heat in the evap. If that is true why would the comp be getting subcooling back and how does the comp actually cool off. This may sound confusing and for that I apologize. If anyone can help it would be greatly appreciated.
The compressor uses cool gas to cool the motor windings. The motor is enclosed so the motor windings have to be cooled in some manner. An open motor uses the air passing over the windings to cool it. Superheat as my understanding is used as a tool to help with seeing if the systems is performing corectly. If your evap superheat too low then your probably bringing too much cool gas and slugging your compressor. Superheat too high then your motor windings are not being cooled properly. Leads to damaged compressor windings. Hope this helps..

Danko

[bama 101]

Originally posted by danko101
I have a question about subcooling. I have been studying hvac books to memorize subcooling,superheat, etc. And I read that subcooling is temp of a substance below its saturation point, which with ref would be a liquid state.
But the other day my sgt asked me if the compressor was getting subcooling back, to cool it off. I thought that subcooling occured in the condensor and super heat in the evap. If that is true why would the comp be getting subcooling back and how does the comp actually cool off. This may sound confusing and for that I apologize. If anyone can help it would be greatly appreciated.


Danko

It is refered to as subcooling in condenser because once the refrigerant is condensed to it's liquid state the amount that the liquid cools after saturation teperature is aquired, or better know as subcooling the liquid before entering the metering device.
Superheat is the heat added to the vapor at the (approx.) last third of the evaporator, but only a small amount of heat is added in turn keeping the vapor cool enough to cool the compressor