<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:14pt"><div><span>In the early stages of space industrialization using</span></div><div><span>small automated mining and processing stations</span></div><div><span>dispersed will have the advantage of not needing</span></div><div><span>additional resources devoted to cooling. Efficiency</span></div><div><span>will require heat dumps which will not exist in</span></div><div><span>many circumstances - particularly early on.</span></div><div><span></span> </div><div><span>Another example of heat issues. Many years ago</span></div><div><span>I heard talk of projections of how gray goo could </span></div><div><span>consume planetary bodies in short order. The projections</span></div><div><span>failed to take basic thermodynamics into account.<br>The friction generated by processing would
have</span></div><div><span>turned the planetary body molten hot with no place</span></div><div><span>to reject heat for further processing.</span></div><div><span></span> </div><div><span>Dennis<var id="yui-ie-cursor"></var></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> Dennis May <dennislmay@yahoo.com><br><b><span style="font-weight: bold;">To:</span></b> "extropy-chat@lists.extropy.org" <extropy-chat@lists.extropy.org><br><b><span style="font-weight: bold;">Sent:</span></b> Wednesday, September 21, 2011 10:31 PM<br><b><span
style="font-weight: bold;">Subject:</span></b> Re: [ExI] Asteroidal mining was Nukes was less expensive energy<br></font><br><div id="yiv734458810"><div style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><div><span>Rejecting heat issues is why so many science fiction</span></div><div><span>space stories and movies are so far off base. Their</span></div><div><span>ships and space stations would turn to toast in no</span></div><div><span>time whatsoever. </span></div><div><span></span> </div><div><span>Dennis</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="yiv734458810hr"></div><b><span style="font-weight: bold;">From:</span></b> Dennis May <dennislmay@yahoo.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> Wednesday, September 21, 2011 10:04 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [ExI] Asteroidal mining was Nukes was less expensive energy<br></font><br><div id="yiv734458810"><div style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><div><span>The cooling numbers I used were from space based</span></div><div><span>cooling radiator engineering.</span></div><div><span></span> </div><div><span>It takes huge radiators for cooling industrial processes</span></div><div><span>in space. Thus the interest in ice bodies where you</span></div><div><span>have a
ready place to dump heat with the side</span></div><div><span>benefit of melting ice for radiation shielding
and</span></div><div><span>water mining.<var id="yiv734458810yui-ie-cursor"></var></span></div><div><span><br>Dennis</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="yiv734458810hr"></div><b><span style="font-weight: bold;">From:</span></b> Keith Henson <hkeithhenson@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> extropy-chat@lists.extropy.org<br><b><span style="font-weight: bold;">Sent:</span></b> Wednesday, September 21, 2011 8:46 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [ExI] Asteroidal mining was Nukes was less expensive energy<br></font><br>On Wed, Sep 21, 2011 at 5:00 AM, May <<a
href="mailto:dennislmay@yahoo.com" rel="nofollow" target="_blank" ymailto="mailto:dennislmay@yahoo.com">dennislmay@yahoo.com</a>> wrote:<br><br>snip<br><br>Dennis, there is a vast literature on the subjects you have been<br>talking about, much of it where people actually worked the numbers.<br><br>Re cooling, there is rule of thumb number anyone can calculate on the<br>radiator area you need per kW of
waste heat at room temperature. I<br>suggest you might want to look up the formula and calculate it.<br><br>There is a subtle problem with scaling down heaters like induction<br>furnaces and scaling up radiators.<br><br>Best wishes,<br><br>Keith<br>_______________________________________________<br>extropy-chat mailing list<br><a href="mailto:extropy-chat@lists.extropy.org" rel="nofollow" target="_blank" ymailto="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a><br><a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat" rel="nofollow" target="_blank">http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a><br><br><br></div></div></div></div><br>_______________________________________________<br>extropy-chat mailing list<br><a href="mailto:extropy-chat@lists.extropy.org" rel="nofollow" target="_blank" ymailto="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a><br><a
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