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Old 07-12-2016, 10:55 AM   #31
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Our Dometic AC units have black cowlings. Would painting them white really make that much of a difference?
Actually, black on the back half (condenser) may actually be better. As I learned in engineering school, a "true black body" will absorb all incoming heat if colder, but will give off heat if warmer. So black will dissipate the internal heat better than white, while white reflects external heat better than black.

So, in theory, better to have white on the evaporator cover and black on the condenser cover. But it would take some experimentation to prove it.

And the amount of "improvement" is probably not even worth worrying about.
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Old 07-12-2016, 11:07 AM   #32
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Originally Posted by rockfordroo View Post
Actually, black on the back half (condenser) may actually be better. As I learned in engineering school, a "true black body" will absorb all incoming heat if colder, but will give off heat if warmer. So black will dissipate the internal heat better than white, while white reflects external heat better than black.

So, in theory, better to have white on the evaporator cover and black on the condenser cover. But it would take some experimentation to prove it.

And the amount of "improvement" is probably not even worth worrying about.
This one reason why motor vehicle engines are painted black. Later RJD
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Old 07-12-2016, 11:27 AM   #33
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Herk, do you happen to remember what size the refrigerant line is that needs to be insulated? Great looking mod and I have plenty of reflectix left over for evaporator box - may as well do it all at once.
Thanks!
The large diameter pipe is cold when running and that is the one you insulate. The small one is hot when running so you should not insulate it. I do not see any need to insulate the hot section as you want THAT heat to leave the enclosure.
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Old 07-12-2016, 11:30 AM   #34
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Anyone have experience doing this mod with something other than reflectix? The bubble wrap material seems a little flimsy to me and the R values, from what I've read are more like R-1 than R-5. The overall concept here seems to be a winner. Would like a more robust material with a better or at least consistent R- value. I'm leaning to Frost-King Aluminized duct wrap, self adhesive, R-3 on the air handler housing. The cost is comparable
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Old 07-12-2016, 11:56 AM   #35
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I've done similar mods to my Jeep.
Insulated the cold pipe in the engine bay, and lined the inside of tub with the reflectix. The insulated pipe makes the a/c blow just a little bit cooler... The reflectix under the carpet helps with heat transfer through the floorboards. It's about changing the percentages in your favor just a little bit. Even if it's "1%", the result is the Jeep is nice and cool even with a soft top 95 degree weather.


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Old 07-12-2016, 12:11 PM   #36
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Originally Posted by Jimandchris View Post
Herk, do you happen to remember what size the refrigerant line is that needs to be insulated? Great looking mod and I have plenty of reflectix left over for evaporator box - may as well do it all at once.
Thanks!
Not 100% sure but I think I used 1/2 inch pipe foam insulation I had around the house.
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Old 07-12-2016, 07:41 PM   #37
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1/2"
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Old 07-12-2016, 10:27 PM   #38
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1/2" is what I used
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Old 07-30-2016, 10:14 PM   #39
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There's a parallel thread to this running over on the Jayco owner's forum, where I now spend most of my 5'er forum time..... It was mentioned that the tread, and the idea originated on the Forest River Forum, and I said to myself that it looks like the kind of thing that Herk would try.... So, I looked for it today, and lo and behold! Herk's the guy who started it! LOL!!!

Disregard the info in the sig. Traded the Rockwood for a North Point (Jayco) 377RLBH late last Fall. Took all of the solar stuff off the Rockwood and reinstalled it on the 377!
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Old 07-30-2016, 10:26 PM   #40
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It a good move to insulate the suction line (cold as you call it) it will help the AC run a little more efficiently. I have done this to mine and added a hard start. I plan to do the reflex soon. good job
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