Who’s Afraid Of Assembly Language? 107 Comments It SHOULD absorb light in the same spectrum as it produces. My question is, why isnt there enough of this radiation in sunlight to cancle out the output from the panel. Regardless, the way the material is described, your panels facing eachother would not violate the secone law, because the non- skycooling panel would radiate back what it got at the same frequency it absorbed (the same way absorbtion spectrum analysis works) and so it would return the energy to the sky panel with the same efficiency that it was delivered. That would suggest that, even though raising the energy of a material does shorten their peak emmisions, they do have a characteristic EMR emission based on their material.
Thats how we tell which elements make up stars. However, seems to me that while Black Bodies follow Planks Law, the whole point of emission spectroscopy is that you can tell which materials are which by the EMR they emit, as different materials have different excitation emissions. So, first excuse my ignorance Ive forgoten Planks Law and my quick wiki dive has not enlightened me. Posted in chemistry hacks, News, Science Tagged Chemistry, infrared, passive cooling Post navigation There’s more to come, including instructions for turning the mixture into self-contained cooling panels, for a power-free air conditioning solution. It ends up about the consistency of cake icing, and had some success applying the mixture with an oversized piping bag. The only problem is that calling the result a paint is being a bit generous. Mixed with the calcium carbonate, it’s both reflective and emissive on that magic IR frequency that passes right through the atmosphere. When the acetone evaporates off, the water is left trapped in the acrylic, making a bright, reflective coating. Mix water, acetone, and bits of Plexiglas. This powder has to be suspended in something to make a paint, and the current recipe is an acrylic with suspended water particles. So the procedure is to make three batches of microspheres, of the three different sizes, and then mix the dried powder in the ideal ratios for maximum density.
Put simply, blend longer for smaller crystals. The more crystals start growing at once, the sooner the solution is sapped of suspended calcium carbonate, and the smaller the resulting crystals.
With the recipe given, the secret is nucleation sites. The trick here is to manage the size of the crystals, mixing large, medium, and super-tiny spheres to achieve maximum density. To really get effective cooling, the resulting paint needs a very high density of spheres. The result is microsphere crystals of calcium carbonate, but that was only half the battle. And it looks like it’s a success, as the recipe is washing baking soda, de-icer, and citric acid, all combined in a blender. The process of making those microspheres is a bit beyond the reach of the average garage tinkerer, so has spent the last year working on a DIY-friendly recipe. This isn’t the first time he’s demonstrated infrared cooling, but the previous demonstration used Barium Sulfate microspheres. That sounds a bit like magic, but apparently the math checks out. The result is a passive system that keeps materials a few degrees cooler in direct sunlight than an untreated piece in the shade. (Video, embedded below.) That’s a coating that radiates heat in the infrared spectrum at a wavelength that isn’t readily absorbed or reflected by the atmosphere.
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