Quote:
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.
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^^^this. You can get sub-freezing vent temps for a while, even in high-humidity environments. But a high heat load, plus positive airflow? Ice might form, but it'll melt almost immediately under the amount of thermal stress a high temp/high humidity location can provide. Now, in a high humidity lower heat area, maybe evap freeze-up is a concern for those who run the AC at full cold 100% of the time, but if you're going for cabin comfort, the thermostat will regulate the compressor such that evap freeze up doesn't happen.
If you're getting evap freeze-up, something is wrong with your system or set-up, OR you're trying to transport meat across state lines.
