<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:14pt"><div><span>Dust - even metal dust - is generally a good insulator so transferring heat to it</span></div><div><span>would be time consuming as would getting it to radiate the heat away.</span></div><div><span></span> </div><div><span>Our old plasma table at work had a dust collection system. The dust produced</span></div><div><span>from cutting stainless steel on a plasma table might resemble some forms</span></div><div><span>of nickel-iron dust. </span><span>The dust has a huge volume per weight and would be very </span></div><div><span>hard on any </span><span>mechanism </span><span>transferring it. We once dumped a partial barrel of it </span></div><div><span>by accident </span><span>and the </span><span>dust </span><span>spread over the ground like a fog floating
downhill for </span></div><div><span>a good 15 </span><span>yards </span><span>or more.</span></div><div><span></span> </div><div><span>Dennis May</span></div><div><br></div><div style="font-family: times new roman, new york, times, serif; font-size: 14pt;"><div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"><font size="2" face="Arial"><div style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;" class="hr" contentEditable="false" readonly="true"></div><b><span style="font-weight: bold;">From:</span></b> Jeff Davis <jrd1415@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> ExI chat list <extropy-chat@lists.extropy.org><br><b><span style="font-weight: bold;">Sent:</span></b> Friday, September 23, 2011 7:00 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [ExI] <span id="misspell-2"><span id="misspell-2"
class="mark">Asteroidal</span></span> mining was Nukes was less expensive energy<br></font><br>On Tue, <span id="misspell-3"><span id="misspell-3" class="mark">Sep</span></span> 20, 2011 at 4:35 PM, Keith Henson <<a href="mailto:hkeithhenson@gmail.com" ymailto="mailto:hkeithhenson@gmail.com">hkeithhenson@gmail.com</a>> wrote:<br><br>> Getting rid of waste heat by radiation is one of the<br>> fundamental problems in space.<br><br>> <a href="http://www.nss.org/settlement/L5news/L5news1979.htm" target="_blank">http://www.nss.org/settlement/L5news/L5news1979.htm</a><br><br>> July and August issues.<br><br>Look, I'm gonna stick my neck out here. I read this, and I thought "Huh?"<br><br>Then, I followed the link, but didn't actually read the article -- the<br>download took a couple of minutes and I never got back to it. So my<br>backside is hanging out there, no protection (didn't do my home work),<br>and I'm up against one
heavyweight -- <span id="misspell-4"><span id="misspell-4" class="mark">Drexler</span></span> -- and Keith.<br><br>So here goes, and if I'm an idiot,...well ...I'll just have to deal with it.<br><br>Dennis wants to explore asteroid mining, and in that regard has spoken<br>of low-g bodies. Also he's spoken of some sort of metallic dust as<br>the product of this mining. So let's work with those assumptions.<br><br>Now, you wanna get rid of waste heat. Fine. Here's what you do:<br><br>Crazy-ass idea #1: "Radiators <span id="misspell-5"><span id="misspell-5" class="mark">schmadiators</span></span>!" Use your metallic dust<br>product as your coolant "fluid". Place it in hot waste heat location<br>where it absorbs some of that waste heat. Transport away from there<br>to the asteroid surface, and toss it up into the air, er,... the vast<br>blackness of space. Toss it just a <span id="misspell-6"><span
id="misspell-6" class="mark">smidgeon</span></span> less than escape velocity<br>-- which for a low-g body would be quite slow actually -- so that it<br>spends a <span id="misspell-7"><span id="misspell-7" class="mark">loooooong</span></span> time "out there" cooling before settling back to<br>the surface. Rinse and repeat. "Problem" solved. No radiators<br>needed. And by the way, those dust particles, lots of surface area.<br><br>Sorry, the dog ate my spreadsheets.<br><br>Okay, let the reaming begin.<br><br>Best, Jeff Davis<br><br> "<span id="misspell-8"><span id="misspell-8" class="mark">Everything's</span></span> hard till you know how to do it."<br> Ray Charles<br>_______________________________________________<br>extropy-chat mailing list<br><a href="mailto:extropy-chat@lists.extropy.org"
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