Theoretical Discharge Temperature

[Old Guy]

How do you calculate or determine the theoretical discharge temperature of an ammonia screw compressor?

[Peter_1]

Drawing the cycle in a log p/h

[ice wombat]

Many manufaturers sw give also the discharge temperature so you can compare it with the p-h diagram

iw

[Sandro Baptista]

Must have in mind that the cooled oil decrease the discharge temperature of the superheated refrigerant.

[desA]

^ That's a very interesting point.

Do you perhaps have any observed information on this effect?

[Quality]

Must have in mind that the cooled oil decrease the discharge temperature of the superheated refrigerant.

Screw Compressor only I think

could be wrong though

[Peter_1]

Must have in mind that the cooled oil decrease the discharge temperature of the superheated refrigerant.

Very true, oil is there to lubricate the screws, provide a gastight seal between them and...to cool down the discharge gases.
Reason why the oil needs to be cooled before it can be reused.

[RANGER1]

Most manufacturers have either tables or a programe that can determine it .

Some things that affect it are ,

Oil temp into comp, oil cooler designed temp , amount of oil going into compressor , pressures of system , suction superheat , screw condition , type or brand of machine .

I would suggest between 60-85 deg C
A booster usually approx 10 deg C lower than high stage .