Does anyone have an estimate (hopefully based on some data) of the loss of efficiency that occurs if you put the condensing unit on the roof in full sun? I'm wondering how much effort should be put into finding a shady spot for it. Also would it help to shade the unit from full sun (or does the efficiency just depend mostly on the ambient temperature around the unit, so that shading wouldn't help if the surrounding roof air were still as hot)?
If nobody knows this, could you estimate this effect by measuring the temp. drop of the output air (relative to the input air) at different times of day? just wondering.
You will use 10% more electricity if it is in the sun. Here is a link to my power company stating this. Read line 7.
I've read it many times here and really believe it makes absolutely no difference.
The biggest benifit of putting it in the shade is when the tech comes to work on it he won't fry in the sun.
UV or direct sunlight doesn't effect operation or efficiency.
It is ambient air temperature.
Now if you have a large enough shady spot to lower the ambient air around the condenser coil 5 or more degrees... you are gold.
If you put it in the shade and keep a coat of wax on it, it will look pretty for a long time.No kiddin'
I agree about the shade. A good customer of mine,
has all of his condensers on the side of his house
shaded by large trees, and surrounded by bushes.
The bushes are trimmed and set back enought so that
the condensers can breethe, when you are there you
can feel a 5 degree or better difference in the
air, and the condensers feel cool also.
I think it makes a good difference, cause when I work
on units on roofs, preassures are higher also.
I heard if you installed the condenser inside your home and and you vent the hot discharge air outside this will save you 25% and the life of the condenser coil is 25% longer,
this test was conducted at Texas A&M.
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Mrbillpro, where did the supply air for the condenser come from? Piped in from other Texas A&M buildings?
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Originally posted by kcroat
Does anyone have an estimate (hopefully based on some data) of the loss of efficiency that occurs if you put the condensing unit on the roof in full sun?
... (or does the efficiency just depend mostly on the ambient temperature around the unit, so that shading wouldn't help if the surrounding roof air were still as hot)?
condenser air ambient temperature.
Wouldn't the ambient air on the roof
at < 2 feet with little or no breeze
be 10' - 15'F hotter?
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The service tech that will be working on it in the future will be more effiencient too, if they are working in the shade also....
In sunny Fl some 20yrs ago a builder was putting a package unit in the attic with a discharge air duct. Drawing in hot attic air as supply. Kinda of worked like an attic fan as well. They were a real nightmare to work on.
how about the fedders adapt-o-matic. put in the attic.
one will save 10 times more $$ by shading the west facing windows, then the south ones, then shading the roof with tall trees! besides, you will have more oxygen.