Robin. My initial reaction is that the assumptions could be way off.
The delta-T of 500K is too large, and the wall thickness of 2 mm is thin for this application. There could be other problems too. For 25 bar pressure, how are you going not to get by with 2 mm walls - more like 6. If the temp gradient is like more like 300 - which would be water at 350 K and interior at 650K, and the wall is 6mm - this might be more accurate. Next, the actual conductance is some fraction of maximum in practice, due to surface oxidation on one or both sides. Not sure where to go for that information. This is where an expert opinion comes in handy. All in all, don't you think it conceivable that this reactor runs at an order of magnitude less maximum heat transfer, and the average could even be a fraction of that? Jones -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, April 19, 2011 8:48 PM To: [email protected] Subject: Re: [Vo]:RE: Rothwell goes into brain freeze - Thermal power.pdf In reply to Jones Beene's message of Tue, 19 Apr 2011 08:27:37 -0700: Hi, [snip] >.plus, stainless conducts heat so poorly that a 5 KG reactor would >surely melt before that rate of energy release could be sustained for >15 minutes anyway - do you really doubt that? Please see attached. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html
