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  1. #1
    Join Date
    Jun 2017
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    1
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    temporary heating vacant building

    What is general rule of thumb for temporary electric heating for freeze protection for a 25,000 sf building?
    40% glass on three sides. Building is empty with no spaces but sprinklered.

    The loads are about 10 btuh. If there is an electric outage do we need to account for a warmup?

    Will heaters at 40 deg temp rise be sufficient?

    Winter outside DB is 15 degf.
    10 heaters at 7.5 kw?

    Is there a Air change method?

  2. #2
    Join Date
    May 2008
    Location
    Missouri
    Posts
    4,368
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    go to www.loadcalc.net and start there.

  3. #3
    Join Date
    Jan 2004
    Location
    PA
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    74,861
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    Probably gonna need a min of 300 KWs of electric heat to keep it above freezing with that much glass.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Mar 2018
    Location
    Denver, CO
    Posts
    13
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    empty water out of pipes way cheaper.

  5. #5
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
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    17,917
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    Quote Originally Posted by database00 View Post
    empty water out of pipes way cheaper.
    it'll still allow mold and mildew to grow.
    This forum requires that you wait 20 seconds between posts. Please try again in 50 seconds.

    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

  6. #6
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    802
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    You have not provided enough information to provide a good answer for your question. A building that size is typically not just one big open area having only one heating or cooling system. Are there multiple rooms or floors?, multiple air handlers, etc... . There's got to be some zoning of some kind. I can't image there is just one fire zone for that size building

    Just some general comments

    Freeze protection in case of a loss of electricity is to isolate and drain all water systems unless the owner is willing to set up a generator (with auto start) to provide electricity to power the normal heating systems.

    For long term protection against a heating system failing but you still have electricity available in un-used or non-inhabited structures is typically to isolate and drain as much water as possible, then use heat tracing on what can't be isolated and drained. With respect to fire protection systems you will want to check with the local fire marshall and or whomever the insurance carrier is for the building to determine if the fire system can be taken out of service. Again fire protection system I assume is just water, but is it a dry or water charged system?

    Not always but mold and mildew need wet (high humdity >70% Rh) and warm temperatures, generally above 70F for molds and mildew to be an issue. Molds and such typically go dormant in dry and/or cool, cold conditions

    You need to think a little deeper or at least provide more detail.
    Good Luck

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