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What does this mean?

ZmanZman Member Posts: 5,753
edited July 2019 in THE MAIN WALL
I am doing some light reading in the 2018 IECC https://codes.iccsafe.org/content/IECC2018P3/chapter-4-re-residential-energy-efficiency

Does anyone know what this part of Table 405.5.2(1) means?

I keep coming up with millions of Btu/day for a 1,000 square foot home. That can't be right...
"If you can't explain it simply, you don't understand it well enough"
Albert Einstein

Comments

  • STEVEusaPASTEVEusaPA Member Posts: 4,115
    1000 sq ft and 3 bedrooms = 54012
    =17900 + (23.8 x 1000) + (4104 x 3)
    =17900 + 23800 + 12312
    =54012
    steve
    Zman
  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 6,947
    forgot what that's called .............order of...........something
  • Jamie HallJamie Hall Member Posts: 12,721
    I have to admit that the way it's presented isn't perfectly clear... @STEVEusaPA 's parentheses are correct -- but it would be better if the publisher had put them in in the beginning, because @Zman 's interpretation isn't actually incorrect, considering just the way it's written, either.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • ZmanZman Member Posts: 5,753
    Thanks @STEVEusaPA
    I guess you need to go to the IMC before they will trust you with 8th grade algebra order of operations :D
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
    Solid_Fuel_Man
  • STEVEusaPASTEVEusaPA Member Posts: 4,115
    edited July 2019
    👍
    It’s actually correct the way it’s written. When no parenthesis are written, order of operations are the rule.
    Just think of a formula with no parenthesis like:

    π r^2
    You would square the radius before multiplying π.
    steve
    Zman
  • LuckyDogLuckyDog Member Posts: 22
    Hey, at least he knew enough to know something was wrong....

    Unlike some fresh-outta-school engineers I have met.
    :)
    HomeOwner



    Building a house in NH
  • rick in Alaskarick in Alaska Member Posts: 1,074
    I came up with 54,600 for my house. Which works out to be 2,277 btu's per hour.Interestingly, the formula assumes all the bedrooms are occupied to get that reading. That would have to be something to factor in if you were trying to get a very accurate heat loss of the house.
    Rick
  • ZmanZman Member Posts: 5,753
    LuckyDog said:

    Hey, at least he knew enough to know something was wrong....

    Unlike some fresh-outta-school engineers I have met.
    :)

    I had an "AHA" moment as soon as @STEVEusaPA pointed it out. The class where I learned order of operations was more than a few years ago :)
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • STEVEusaPASTEVEusaPA Member Posts: 4,115
    I wonder how the kids solve that equation with the new style math?
    steve
  • ratioratio Member Posts: 2,353
    "Siri whats the ansrwe"?
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