[Long Haired Git]

Originally Posted by Les

The overall heat transfer coefficient can be considered constant.

Thanks Les - I'll just leave it constant and not worry about it ever again. The facts and figures "sourced" from the web are varied enough in their production (and influence of marketing depts) to always have my numbers as approximations only. Just thought the C/W might be linear or heavily influenced by the delta-T leading to massive errors.

BTW: I was too scared to follow the link: your engineering skills and knowledge are on another plane of existance to mine. I've downloaded the "heat transfer physics textbook" pdf thing, and that scared me off doing anything remotely scientific around heat transfer. Can of Worms? No, entire oceans of worms each plucked from Dune.