![]() This is because the sunlight will warm you more than radiative sky cooling will cool you. “For this reason, the amount of heat flow off the Earth that goes to the universe is enormous.”Īlthough our own bodies release heat through radiative cooling to both the sky and our surroundings, we all know that on a hot, sunny day, radiative sky cooling isn’t going to live up to its name. The heat just flows,” explained Fan, who is senior author of the paper. “If you have something that is very cold – like space – and you can dissipate heat into it, then you can do cooling without any electricity or work. This phenomenon is particularly noticeable on a cloudless night because, without clouds, the heat we and everything around us radiates can more easily make it through Earth’s atmosphere, all the way to the vast, cold reaches of space. You can witness it for yourself in the heat that comes off a road as it cools after sunset. Radiative sky cooling is a natural process that everyone and everything does, resulting from the movements of molecules releasing heat. Together, Fan, Goldstein and Raman have founded the company Sk圜ool Systems, which is working on further testing and commercializing this technology. It provides for the first time a high-fidelity technology demonstration of how you can use radiative sky cooling to passively cool a fluid and, in doing so, connect it with cooling systems to save electricity,” said Raman, who is co-lead author of the paper detailing this research, published in Nature Energy Sept. “This research builds on our previous work with radiative sky cooling but takes it to the next level. The entire cooling process is done without electricity. Now, Fan and former research associates Aaswath Raman and Eli Goldstein, have shown that a system involving these surfaces can cool flowing water to a temperature below that of the surrounding air. ![]() Research published in 2014 first showed the cooling capabilities of the optical surface on its own. ![]() A fluid-cooling panel designed by Shanhui Fan, professor of electrical engineering at Stanford, and former research associates Aaswath Raman and Eli Goldstein being tested on the roof of the Packard Electrical Engineering Building. This is an updated version of the panels used in the research published in Nature Energy. ![]()
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