Saturation temperatures

When looking at saturation temperatures what “rule of thump” are you guys using?

Saturated condensing temperature 10-15’c above ambient

saturated evaporating temperature 10’c below space temp ( cold rooms/ freezers)

Just curious what you guys are using.
thanks.

.

With air cooled

condenser is 15k above ambient and evaporator is 10k lower than air off.

So rule of thumb. Condenser 15 higher than air on, evaporator 10 lower than air off.

Rob

.

Read this on this forum not sure who posted it

Here are some figures :

Tai ----- air entering temperature
Tao -----air outlet temperature
Te ------Evaporating temperature
Twi ------water entering temperature
Two-------water outlet temperature
Tc---------condensing temperature



Air conditioning (evaporator) :
Tai-Tao = 8 to 10 °C
Tai-Te=16 to 20°C
Tao-Te=8 to 10°C

Refrigeration (evaporator) :
Tai-Tao = 3 to 5 °C
Tai-Te=5 to 10°C (evaporator TD) take low TD for high relative humidity
Tao-Te=3 to 5°C

Water Chiller (evaporator) :
Twi-Two=5°C
Twi-Te=10°C (evaporator TD)
Two-Te=5°C

Air cooled condenser :
Tao-Tai=5 to 10°C
Tc-Tao=5 to 10°C
Tc-Tai=10 to 20°C (condenser TD) take low TD in design for hot climate so the condenser will be bigger.

Water cooled condenser :
Two-Twi=5°C
Tc-Two=10°C
Tc-Twi=15°C (condeser TD)