Condenser's Liquid Temperature of a Freezr

[nadeem.usmani]

For a typical R22 Freezer which have a evaporator Temperature of -20F, what should be the discharge & liquid temperature of the condenser coil in a 85F ambient

In an air conditioning should it should be around 150F for discharge and 45F for liquid, leaving the condenser?

What is the basic difference in the condensing units of the above two application

[Rob White]

.

There are two ways of doing this

One is a rule of thumb way and one is the scientific way.

Rule of thumb will have the condensing temp about 15 degs above ambient
and subcooled liquid out of the condenser at about 4 or 5 degs below condensing temp.

Unless you have liquid subcooling in place, free natural subcooling can never be below ambient.


The most accurate way would be to plot the pressures and temperatures on a Ph chart
and it will tell you exactly what you want to know.

Oh PS my temperatures are in Centigrade so conversion will need to be done.

Regards

Rob

.