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In a Ammonia storage tank (at atmospheric condition and -33 deg C) when will more boil-off happen:
a) If the Ammonia is filled till half of the level , or
b) If Ammonia is filled up to full height
Tank construction is with Double wall, with perlite concrete at bottom, foam glass at bottom and Mineral wool at suspended deck.

 
Answers
09/01/2013 A: keith bowers, B and B Consulting, kebowers47@gmail.com
B: the greater the liquid wetted surface, the more heat will be transferred into the liquid. Gas films have heat transfer coefficients a factor of 100 or more lower than boiling liquid.