tag:blogger.com,1999:blog-29179089.post7804500580474830277..comments2024-03-28T19:12:48.071+10:00Comments on Planetary Vision: The porous plate sublimatorCarbon Conhttp://www.blogger.com/profile/11326150646151735913noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-29179089.post-85080956448257389222021-07-24T14:56:50.289+10:002021-07-24T14:56:50.289+10:00In your posting, you have done a pretty good job e...In your posting, you have done a pretty good job exposing the difficulties in attempting to apply sublimation as the working mode for a space-vacuum water cooling system. You have pointed out just about every way in which this principle won't work. So, what exactly was NASA's method of choice? You have dug up a couple reports - from 1965 and 1969 - that attempt to describe a method for cooling a suit - the porous nickel plate sublimator - but is this actually what NASA ended up using? Utilizing a sintered nickel plate seems to be wrought with too many obstacles. Over the past several years, closely studying diagrams and photos of the suits, I have not seen any evidence of such a device being employed. The backpack appears to be tightly filled with various apparatus and breathing supplies, but no consideration for thermal management. <br />Wouldn't a simpler approach avoiding ice (and sublimation) be just a good? Perhaps a metered flow of water through an orifice, surrounded by a constant flow of warm water from the suit? If the orifice were designed in such a way to incorporate a ported manifold conveying warm water from the suit, it would be prevented from freezing while boiling its own supply of feed water into vapor from the extreme vacuum of space. The orifice - or multi-port nozzle - might provide all the cooling effect necessary to maintain the circulating water at a comfortable temperature. Just a thought...Yhttps://www.blogger.com/profile/12323432921177024414noreply@blogger.com