Re: Underground
That's why you use porches and overhangs so that a high-angled sun such as you see in torrid climates tends to miss the windows. That helps to make the air inside cooler than the outside barring other sources of heat such as people. The trick here is you normally also have to have some degree of open air circulation to help take out internal heat that builds otherwise. Which you can't really do if the outside is just too dang hot (the point of the article). But that is another matter.
Just throwing stuff at the wall here. Is there a limit to how concentrated a heat exchange you can make? If it was possible to make the exhaust part of an air conditioner even hotter, that could allow better heat transfer outside, even in the hot conditions described in the article. What stands in the way? Metallurgical limits? Properties of the refrigerants?
Biting the hand that feeds IT
