Energy calculation for HVAC systems

  1. MacLaddy

    MacLaddy 228
    Gold Member

    I've been asked to approximate a dollar amount for heating and cooling an occupied tenant space in a commercial office building.

    We've looked into installing a temporary gauge on each unit to give us a good approximation, but the cost to gauge up all the electrical and gas was beyond the scope of what I'm allowed. I even looked at just gauging up a few and approximating the rest, but that wasn't feasible either.

    The only variables I can provide are square footage, head count, and a possible computer count.

    Any ideas on how I can come up with a reasonable number? Any help is appreciated.


    Additional Info - This space is controlled by 8 package rooftop Lennox units, varying between 3 and 7 tons.
  2. jcsd

    NUCENG 916
    Science Advisor

    ASHRAE provides standard heating and cooling procedures for estimating heating and cooling energy balances. See if you can access any of their handbooks or technical standards at your school or company library.

    or get an estimate from a heating and air conditioning contractor or your local utility.
  4. russ_watters

    Staff: Mentor

    The only way to get a realistic estimate is to use a computer modeling program.
  5. MacLaddy

    MacLaddy 228
    Gold Member

    Thanks for the link. I'll look through it.

    That's what I was afraid of. There are just too many variables to take into account.
    Just curious, what kind of program could model this? I haven't delved into anything like that yet.

  6. russ_watters

    Staff: Mentor

    Free 30 day trial...
  7. MacLaddy

    MacLaddy 228
    Gold Member

    Thanks Russ! I'll give it a shot. (although I doubt I'll be able to accomplish much without training)
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