Original message
| thermo#1
 |  "super heat subcooing"
, posted Sat 16 Feb 17:15  
would like the defininitions of super heat and subcooling and how thay are checked
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Replies:
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| Technician
| "Re(1):super heat subcooing" , posted Sun 17 Feb 16:46:
Superheat- The amount of heat added to a liquid (refrigerant)
above it's boiling point.
Subcool- If the temperature of a liquid is lower than the
saturation temperature for the existing pressure.
You need refrigeration guages in order to determine superheat and sub cooling. For super heat you subtract the evaporator saturation temp. (found on the low side guage), from the low side surface temp.
For subcooling you subtract the outdoor temp. from the high side line temp.
[this message was edited by Technician on Sun 17 Feb 16:48] |
| | theduke03
| "Re(2):super heat subcooing" , posted Tue 19 Feb 19:37
quote:
For subcooling you subtract the outdoor temp. from the high side line temp.
...
You can't put a price on comfort! Be Safe.
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| | chiller guy
| "Re(3):super heat subcooing" , posted Wed 20 Feb 17:28:
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
[this message was edited by chiller guy on Wed 20 Feb 17:29] |
| | chiller guy
| "Re(2):super heat subcooing" , posted Sun 17 Feb 20:24
Superheat - The amount of heat added to the refrigerant VAPOR from the evaporator after it has completely vaporized within the evaporator. In other words, you have boiled off all the liquid and are adding additional heat to "superheat" the vapor. We do the same thing in some boilers to "superheat" the steam (dry it out).
Subcooling - The amount of heat removed from the liquid refrigerant after it has completely condensed within the condenser. So,after condensing all the vapor to a liquid in the condenser we pass a column of liquid through the condensing medium (air or water) to remove additional heat from the liquid thus "subcooling" it below its condensing temp.
Since both superheat and subcooling are sensible heat they cannot be calculated directly from a PT chart. They are the difference of the Saturated temps (from the PT chart)and the actual temp of the refrigerant (as measured by a thermocouple hooked to the suction/liquid line.
Does this help?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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