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Old 03-24-2012, 11:40 PM   #15
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The temperature of the ambient air directly affects the operation of the condenser.

The greater the difference in temperature the better.

Shading the unit will reduce the solar heat on the unit but the reflected heat from the roof causes the air to be warmer.

Figure out how to keep the roof cool and it will help.

You could add a fan to your cover to increase air flow around the action and it could help
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Old 03-25-2012, 01:36 AM   #16
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Quote:
Originally Posted by TQ60 View Post
The temperature of the ambient air directly affects the operation of the condenser.

The greater the difference in temperature the better.

Shading the unit will reduce the solar heat on the unit but the reflected heat from the roof causes the air to be warmer.

Figure out how to keep the roof cool and it will help.

You could add a fan to your cover to increase air flow around the action and it could help
A shade wouldnt decrease the ambient air temp..
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Old 03-25-2012, 07:51 AM   #17
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A shade wouldnt decrease the ambient air temp..
But by shading a roof, you do reduce the solar load on the roof. Darker colors do increase the solar load.

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Old 03-25-2012, 02:30 PM   #18
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True.. But thats a big shade
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Old 03-25-2012, 10:19 PM   #19
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True.. But thats a big shade
It's done all the time in AZ.
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Old 03-25-2012, 11:16 PM   #20
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It's done all the time in AZ.
Do you have a picture/s? Please.
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Old 03-26-2012, 02:41 PM   #21
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If you build a cover over the top of the AC it could reduce the efficiency of the AC a great amount.

The condenser transfers the latent heat captured by the evaporator into the outside air.

The condenser is designed to operate within a specific range, as you get towards or above that range it falls short.

Thus less heat is removed and the compressor works harder.

If the cover is low and there is little wind the area under the cover can get warmer than the surrounding air making it worse.

If the cover is high enough to prevent a concentrated warm area then you may gain some.

The goal is to figure out how to get cooler air into the condenser.

Secondary issue that may give the better operation is the indoor air does go through the unit mounted on the roof which contains the evaporator.

On a home unit the dual pac units where everything is installed on the roof have a lower SEER rating because the indoor air travels through the device on the roof.

So sun heats the box which takes some of the cooling away, blocking the sun reduces this loss which would vary by unit design.

So you could look at the unit, there may be ways to reduce the solar heat, insure it is painted white, removing the cover and cleaning the coils, adding insulation to the cover and isolating the areas where indoor air is via insulation.

If you can properly insulate the box then the sun will have less of an effect.

If you can get more or cooler air into the condensor you also improve things.

If you are long term in a CG you may be able to add an additional fan and may be a duct to pull air from the shade, but the cost of the materials and to run the fan may be greater than the savings.

On the other hand, one could get crazy and look at the solar powered attic fans, one could place one of these in such a manner to add additional air flow into the area where the condenser is, they usually have not the best design for air flow.

Just like the solar powered fan kits used on the vents to the refridgerator.

The brighter the sun the more the fan runs, could work...
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Old 03-26-2012, 03:01 PM   #22
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Personally I would leave it alone. The manufacturer has already made a cover for it and it has been tested I'm sure under different environmental changes to produce it's max output. If they wanted you to cover it I'm sure they would have designed one themselves and offered it as a optional item. Chances are something you build could restrict air flow and you'll be defeating the purpose. JMHO
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Old 03-26-2012, 03:13 PM   #23
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You could also use a micro mister/fogger and mist cool water on the coil.. will absolutely freeze you out
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Old 03-26-2012, 09:05 PM   #24
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Do you have a picture/s? Please.
Are you seriously going to tell me you have never seen RVs in parks parked under shade covers?
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Old 03-26-2012, 09:27 PM   #25
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I used shade and water misters on the sticks and bricks A/C compressors in Oklahoma and it cut the cooling costs about 25%.

My plan to cut RV cooling costs is to head north for the summer.
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