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Heat sizing question

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zepfan
zepfan Member Posts: 464
in Gas Heating

does anyone have a rule of thumb to determine for the heat load for storage warehouse. In our area for residential with standard 8’6” ceilings I normally use 30 BTUs per square ft., and add in 10 percent for morning warm up, and extreme cold days.
The project in question would use LP gas unit heaters and is 51,100 cubic feet, 2544 square feet. That includes the 20 foot high ceiling which is bar Joyce then metal deck.
Any suggestions would be much appreciated. Thanks to all

Comments

  • GGross
    GGross Member Posts: 1,914

    do you live in alaska?

    EdTheHeaterMan
  • Jamie Hall
    Jamie Hall Member Posts: 27,396

    Why not do the Manual J calculations? For a structure like that they would take perhaps half an hour…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    EdTheHeaterManGGross
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 12,284
    edited April 16

    Here is why 30 BTUs per square foot does not work.

    image.png

    If you are using that method for all your estimates, then you will over size equipment on a regular basis. And you thought you were doing it the right way all these years, didn't you?

    If this does not make sense to you then PM me for a detailed explanation

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    GGross
  • pecmsg
    pecmsg Member Posts: 7,086
    https://forum.heatinghelp.com/discussion/comment/1894492#Comment_1894492

    South Texas?

  • zepfan
    zepfan Member Posts: 464

    thanks for the responses. We are in Maryland. The 30 btus per square foot was given to us a rule of thumb by our carrier representative 25 years ago when the switch was made from atmospheric furnaces, to draft induced. Most contractors in our area use the same rule of thumb

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