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Bojan Bojanic
23-12-2010, 10:35 PM
Hi All,

Got a bit of a debate going here about setting superheats.
Case:

Evaporator temperature (converted from pressure)
-24 Celsius
Temperature at the bulb -20

Is that a correct way to set 4K superheat or should the temperature at the bulb be -28??

Magoo
23-12-2010, 11:27 PM
Hi Bojan.
go to www.kueba.de (http://www.kueba.de) and look for the service tools area.

monkey spanners
24-12-2010, 12:04 AM
Found this on the sporlan/parker site

http://www.parker.com/literature/Sporlan/Sporlan%20pdf%20files/Sporlan%20pdf%20Miscellanous/Form1.pdf

Basically if you are evaporating at -4C for example which you have determined by taking the pressure at the evaporator outlet and converting that pressure into temperature with a pt chart, you then take the temperature at the outlet and compare the two, say its 3C then you have 7K superheat. Its K for Kelvin as its a difference in temperature and not an actual temperature.

Jon :)

Peter_1
24-12-2010, 09:15 AM
Evaporator temperature (converted from pressure)
-24 Celsius
Temperature at the bulb -20

Is that a correct way to set 4K superheat or should the temperature at the bulb be -28??
You have indeed 4K superheat, if you should have -28°C, then you have subcooled instead of superheated gas.
Which isn't possible in an evaporator.