SuperHeat Setting

[Bojan Bojanic]

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]

Hi Bojan.
go to www.kueba.de and look for the service tools area.

[monkey spanners]

Found this on the sporlan/parker site

http://www.parker.com/literature/Spo...nous/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]

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.