March 2008 Temperatures

[Paulh_Boats]

30 tubes, details in earlier posts.

Top of the tank 80C !

Middle of the tank 71C !

[Ivan]

One tube, containing methanol-depleted glycerine.......boiled (290C  )

[renewablejohn]

Ivan

290C  you have my interest Glycerine instead of thermal oil now theres a thought. Must be a down side otherwise everybody would be using glycerine instead of expensive thermal oil.

[Ivan]

It heats up a lot faster than water because it has much lower heat capacity (same true of thermal oil, I guess). Eleanor made some interesting comments on glycerine in a previous thread - http://www.navitron.org.uk/forum/index.php/topic,2626.0.html - with a reference that infers a decomposition can take place to toxic acrolein at around 280C. There's certainly a ready supply of the stuff, but as thermal oil is presumably a one-off expense, it's not really worth the hassle is it?