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[quote user="timz"]Yeah, what's the difference between Free Gas Area and Unfree Gas Area-- no idea. You'd think gas area would be the total inside cross-sectional area of the tubes and flues, minus the outside cross-sectional area of the superheater tubes, but I've never seen that confirmed.[/quote] Thank you Timz,so its OK I got puzzled with this term. Really, I did not know where to start with it.My original guess was, it could point to the Volume of Steam, produced in the boiler.By your explanation, it does not seem really important anymore, as someone would better calculate theoutside-heating-surface of the tubes and superheater?Best Regards Lars-BTW- Thank you for your explanation on APL 3985 run last time.
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