Quote:
Originally Posted by blw2
I'm glad this thread came back around. I've been thinking about having a look at sealing &/or insulating my plenum a bit better...and also painting my outer cowl white instead of the black it is now.
But re-reading this thread, maybe I just missed it, but I see lots of mention of various discharge air temperatures... but I'm thinking that probably really isn't the whole picture. The difference between the temperature at the air return vs the discharge is what you want to look at. Generally a delta of approx 15-20 degrees F (as I recall) is what you'll see if properly operating.
I'm curious if these mods being discussed increased the delta at all?
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Yes, I know they say "20 deg temp diff and your AC is working fine". But I disagree with that after I did my mods. (But I might have been just lucky with my results).
I thew all that out the window and concentrated on making the outgoing temp as cold as possible + rejecting as much heat as possible so the AC can do its job.
I say try to get as much as you can out of any AC unit as long as it dont frost up. Why limit yourself (or accept) 20 deg? Plus I ask myself why does my 15 year old car AC put out 37 to 40 deg and the RV is only 65 deg?
Yesterday I cranked up the AC (RV was out in full sun) and my thermostat showed 96 deg in the bedroom so put my temp probe in the vent under the direct cold air flow and 10 min later and it showed 45 deg! I dont know exact inlet temp but it had to be close to 96 deg. Thats 51 deg differences!! Even if around the AC it was cooler like 90 that still 45 deg. And I really dont care what the inlet is as long as the output is 45 deg! LOL.
So I set my timer and at 30 minutes it dropped 5 deg (91) then 30 more mintues it was at 85 deg. I we loaded up for a picnic with my 84 year old mother and with the cab AC and roof AC running full blast 30 minutes later we were at 74 deg in the middle of the RV and 76 in the bedroom. Im happy with my results. We stopped and I pulled the curtains to block the two front cockpit windows (left the front windsheild open) and the temp dropped to 72 deg in the kitchen area and 73 in the back (but that was about an hour later).
Full sun the entire time, 93 deg outside temp with high humidity.
Last year I suffered along because mine was only doing about 65 deg out temp but it would never cool the RV below 82 degrees with ALL of the windows blacked out with reflective bubbles (in full sun). I dont even use the bubble now (Pain in the rear) unless im parked in one spot for half a day or more - Even then I like to have a view so I will remove if no direct sun comming in.
But like they say results may vary and the cockpit area is warmer by the front window but not bad.
I need to put by temp gage on the coffee table between the camptains chairs for my next test.
And then the final test I will use all my bubbles and black out all windows and see if I can get into the 60's! Burr. Might use entire the RV for a frig when we have company over. LOL
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