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Storage building HVAC

Discussion in 'Commercial Energy Codes' started by Bryant, Jul 17, 2020.

  1. Bryant

    Bryant Registered User

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    Have a S1 use, 13994 square ft., sprinklered (gets it over 903.2.9 15 VCC) and is a PEMB (metal storage facility).
    The contractor wants to condition the PEMB (climate control) and is using 2 HVAC single zones to conditon the space and afford protecion from freezing of the sprinlker system.
    The problem insofar as the energy code requirements of 2015 VECC/IECC 403.2 & following sections as mandatory, is all the doors are rolled up and are accessible only from the exterior. Don't have the R value of the OHD's but I'm sure it is alot less than what is required for the thermal envelope as called out in table 402.1.3.

    In my mind this would be difficult to maintian a conditoned space when roll up doors are wide open and losing all the energy in the building to the outside. Most have burglar wiring several above the stalls, so anything ,everywhere will follow the pressure out the door. I think designating a low energy building would be the way to achieve compliance, otherwise how could it be maintained?
    Thoughts anyone.

    Thanks in advance
    Bryant
     
  2. cda

    cda Sawhorse

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    The fire sprinkler requirement is maintain pipe to 40 F.

    Not into energy, but if that is the only reason for the heaters, does that make a difference.

    With the thought, that if it is freezing outside, the doors will not stay open long??
     
  3. steveray

    steveray Sawhorse

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    Dock doors are required to have dock seals....There is no requirement for OH doors to auto close....Just like all of the other doors....If they can't make the U factor with the OH doors, a variance or low energy might be the only other alternatives...
     
  4. Bryant

    Bryant Registered User

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    @cda, yes for sprinkler unless a drive type of system. It is directed towards the energy code in this situation.
    @steveray, agree. Not dock doors for sure. My thought was the same, a modification or call it a low energy building.
    Thanks
     
  5. e hilton

    e hilton Bronze Member

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    Add heat tracing to the sprinkler pipes. It will cost a whole lot less in monthly utility bills than running the heating system. And it puts the heat right where its needed.
     
    ADAguy and Msradell like this.
  6. Bryant

    Bryant Registered User

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    Wanted to bounce this one off the wall. if the heating and cooling loads were under the threshold of 3.4 btu/hr. for a conditioned space. Would you consider it a low energy building and move on provided no other codes are affected ?
    There are two scenarios that play out. One, the storage facilities that open from the outside only vs. the true interior climate controlled "conditioned space". Not trying to reinvent the wheel here, but the latter is never going to qualify for a conditioned space with little or no control over running the AC full blast because several renters have all the roll up doors wide open for hours upon end. Hardly the condition for this space to be called conditioned.
     
  7. steveray

    steveray Sawhorse

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    C402.1.1 Low-energy buildings. The following lowenergy
    buildings, or portions thereof separated from the
    remainder of the building by building thermal envelope
    assemblies complying with this section, shall be exempt
    from the building thermal envelope provisions of Section
    C402.
    1. Those with a peak design rate of energy usage less than
    3.4 Btu/h · ft2 (10.7 W/m2) or 1.0 watt per square foot
    (10.7 W/m2) of floor area for space conditioning purposes.

    Sure.....But without all of the details, the Separated may get you...
     
  8. cda

    cda Sawhorse

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    Once again,,,
    The only Reason you are heating the building,,,

    Is to protect the fire sprinkler piping??

    Seems like that should help
     
  9. steveray

    steveray Sawhorse

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    Not really...IECC doesn't care why you are wasting energy...If you could call the heating part of a process, you could get a pass...In other words, not a "building system" or equipment...

    C101.2 Scope. This code applies to commercial buildings and the buildings’ sites and associated systems and equipment.
     
  10. Bryant

    Bryant Registered User

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    I hate to beat this one up, but it is becoming problematic in the sense, no two storage facilities seem to comply collectively in the energy code, let alone other requirements of the codes. One that comes to mind often is the language in 903.2.9 VCC/IBC. exemption #5 is always the kicker. I wont dive into that, it of itself is a subject.
    the question is, how can one show compliancy for a low energy building if the occupants and or stuff lets say, needs condition space. Does the building envelope matter in this scenario? By definition conditioned space is inside of the thermal barrier and yet a low energy building may not need to meet the thermal/air barrier requirements of chapter 4 of the IECC?
    The point is, the contractor can not gain compliance with any other method and yet to call it a low energy building to afford some protection i.e. sprinkler system, possible storage goods that need to maintain a temperature above freezing and any thing other than a conditioned space for occupation, yet here it is, everything normally would work, but the energy wasted does not justify even calling it a low energy building in the cusp of building designs. One analogy the code makes to discern a low energy building, is a green house. Some green houses are hotter than others and zones vary so one size does not fit all in my opinion.
    So, does the designer show failure to get below 3.4 BTU/Hr and say it is a low energy building using a unitary HVAC package designed at the low end and inside the thermal/air barrier and call it a day?
    Stuck between hot & cold
    thanks in advance
     
  11. steveray

    steveray Sawhorse

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    Greenhouse conditioning is a "process" IMO....not space conditioning....
     

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