[Bldg-sim] Baseline System For Semi-Heated Space for LEED

[Karen Walkerman]

Thanks Bill.  I didn't realize 90.1-2010 gave a little more info on this
topic.  The space is actually pretty large, and doesn't fall under one of
the types you listed in ASHRAE 90.1-2010.  It's a maintenance/garage area
and has less than the required btu/sf for space heating (but some
additional capacity to to temper ventilation air).  There is additional
capacity to make up for outdoor ventilation air, so not modeling the energy
use would be a mistake, I think.  What do you think about modeling the HVAC
systems for the spaces identically in the baseline and proposed?

--
Karen


On Fri, Aug 17, 2012 at 9:16 AM, Bishop, Bill <bbishop at pathfinder-ea.com>wrote:

>  Karen,
>
>
>
> A “semi-heated” space is not a “conditioned space” per ASHRAE 90.1. For a
> LEED/Appendix G model, the baseline system type is based on conditioned
> floor area, and the requirement for modeling heating and cooling applies to
> conditioned spaces only. You could model the space as unconditioned in the
> baseline and proposed models, and capture the semi-heating as neutral
> process energy.
>
>
>
> Alternatively, you could use System Type 9 or 10 from ASHRAE 90.1-2010.
> Systems 9 and 10 apply to “thermal zones designed with heating only systems
> in the proposed design, serving storage rooms, stairwells, vestibules,
> electrical/mechanical rooms, and restrooms not exhausting or transferring
> air from mechanically cooled thermal zones in the proposed design” per
> G3.1.1 Exception e. The ASHRAE definition for “zone, HVAC” is “a space or
> group of spaces…”, not “a conditioned space…”. So I think you could apply
> System 9 or 10 to a semi-heated space, if the space type is one of those
> listed.
>
>
>
> Either of these options should be easy enough to change/undo if a LEED
> reviewer disagrees with your approach.
>
>
>
> Regards,
>
> Bill
>
>
>
> [image: Senior Energy Engineer 28Jun2012] <wbishop at pathfinder-ea.com>
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Karen Walkerman
> *Sent:* Thursday, August 16, 2012 8:36 PM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Baseline System For Semi-Heated Space for LEED
>
>
>
> Hi,
>
>
>
> I have a space that meets the requirements of a "semi-heated" space.
>  Question is - how do I model the baseline system?  I have found no
> information in AppG, LEED, or any other resources.
>
>
>
> Thanks,
>
>
>
> --
>
> Karen
>
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