Sub-freezing Vent temps... HOW?

[KelogGes]

Originally Posted by rick-l

The more I think about that, it makes sense.

The latent heat of evaporation is 600 cal/gram. The specific heat of ice is .5 cal/gram. The latent heat of fusion (melting) is 80 cal/gram.

So once the sensor/evaporator get a coating of ice on it the temperature rapidly goes down below freezing but the fan is still blowing hot air over it sucking out 600 calories per gram until it melts. I bet it isn't ice for long.

Well Put rick-l!

And you're correct "it isn't ice long" if at all grin!

IN Outside ambient @ 95 degrees F in South Florida
Using my custom made high tech dual 911 matched set PFC's with minimal refrigerant (I.E. approx 0.9 lbs R134A) allows me to consistently get vent temps of in the 30's F (slightly above freezing) even in high humidity, with out freezing up; until the cabin temp is down to a preset comfortable level.

People who decide to use old technology and more then TWO condensers in the OEM placement on 911's crack me up! But to each their own.