h.w. unit heaters

bob young · December 2005

Thanks Tim for your input. is this an accepted formula ? i had no trouble doing the math . it seems way too easy ! i always figure for the worst case scenario ! lol

bob young · December 2005

h.w. unit heaters + boiler

NEED HELP on this one. best method to figure overall btu size for hot water unit heaters + hot water boiler for closed warehouse 60' x 130' x 15' ceilings. no windows one 8x8 door. concrete block construction w/ flat roof. no insulation. can give more detail on existing system.

tim smith · December 2005

heat loss

? outdoor and indoor design temp. Then take the temp difference and multiply x .40 for ceiling x sft of ceiling. Then temp diff x .25 x sf for walls. Then permiter slab length x temp diff x 1.19. Then take volume of space x 1 for infiltration. add all together then maybe 15% safety factor, this would probably get you in the ballpark. Also go to Slantfin.com and they have a free heatloss form and use same sq footage and plug in to there calc for a comparison. Copy of link below. http://www.slantfin.com/he2/orderhe2.html

tim smith · December 2005

approved method?

These #s are off equipment sizing form from our local municipality. Using standard #s for U values for generic construction. It will get you in the ballpark. Also double check them with the slantfin sizer. NOTE: these calcs are for the connected load. Then maybe 15% piping and pickup at the most depending on piping arrangement. Good luck, Tim

h.w. unit heaters

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