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Evaporator temperature

scubadiver on Thu August 30, 2007 5:40 PM User is offline

Year: 1989
Make: Prevost
Model: Motorhome
Engine Size: 8V92
Refrigerant Type: 134a conversion
Ambient Temp: 95
Pressure Low: 25
Pressure High: 195
Country of Origin: United States

When describing system performance people often describe center outlet temperature, but what sort of temperature differential are they getting? In a car after a few minutes the interior temperature and humidity drop pretty quickly.

In my motorhome (drivers air only) the temperature and humidity will stay high a long time. I see a 28 degree drop across the evaporator but as the interior will stay at 85 for a long time in the sun, it blows 57 degree air for the first half hour, or when really hot out, that's all it can do with all the heat load.

A car with a 30 degree differential pretty quickly cools to 70 degrees inside and blows really cold air.....

Does anyone put a probe in the intake plenum and look at the differential? What sort of numbers do you see?

Thank you!

Wet in Washington on Thu August 30, 2007 7:57 PM User is offline

You got a generator and roof air on that thing? I'd start the generator and turn the roof air on.

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Never take life seriously. Nobody gets out alive anyway.

scubadiver on Sun September 02, 2007 11:25 AM User is offline

No one measures evaporator differential temperature?

TRB on Sun September 02, 2007 6:08 PM User is offlineView users profile

Once a passenger car cools down you will see close to a 8 degree core temp to vent temp separation.

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Wet in Washington on Mon September 03, 2007 12:26 AM User is offline

Differential between ambient and inside air? I'm not sure I follow you. Could you be a little more specific.

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Never take life seriously. Nobody gets out alive anyway.

scubadiver on Mon September 03, 2007 9:30 PM User is offline

Sorry, I should have been more clear.

Temperature change of the now cold dry air inside the car recycling through the evaporator air inlet in the footwell (or thereabouts) and the air temperature coming out of the center vent.

Called Delta T on residential supply and return (typically 20 degrees).

Once the car cools down the inside is air maybe 75 degrees and dry, so air coming out the vents at 35 degrees would have a 40 degree delta.

Is 30 or 40 degrees normal, or does it vary widely with different systems.

Thanks for humoring me, just trying to understand what to hope for.

Edited: Mon September 03, 2007 at 11:11 PM by scubadiver

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