One vote, white.
To further refine the question. Maybe a white sun shade, about a foot out, would be workable. Plenty of air flow available.
Christopher A. Young Learn more about Jesus
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The question at hand was obviously not whether the color of a condensor makes a difference for a fridge in general. The question was whether the color of a fridge condensor that is outside, EXPOSED TO SUNLIGHT, makes a difference.
Stormin: "If a refrigerator is used outdoors, in the summer. The condensor on the back, is black tubing. As we know, black absorbs heat from the sun shine, which makes the compressor work harder. "
Now, it seems you agree that white will reflect more of the sunlight. At the same time, white paint and black paint will both allow about the same radiation from the condensor. That means with white you radiate virtually the same amount of heat out, but because it's white, it reflects a lot of heat from the sun that it would absorb if it were black. Ergo, if the condensor was painted white instead of black, it would transfer virtually the same amount of heat via radiation, but it would be heated less by the sun.
And I also totally agree with Vic that the overwhelming heat transfer from the condensor is via convection, not radiation. So, again, which condensor is going to be more efficient? A black one that has to not only get rid of heat from the fridge mainly via convection, but also the additional heat from the sun? Or a white one, that has less heat absorbed from the sun? I vote for white.
Finally, I think the overall effect on efficiency of the fridge from the color of the condensor with sun shining on it is still probably small in the grand scheme of things.