[Bldg-sim] Thermal Zones

[Rob Hudson]

This is the approach i previously took.  i got review comments back and
wanted to double check to make sure before i resubmitted.

thanks,

On Fri, Nov 12, 2010 at 10:00 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

>  Rob,
>
>
>
> Generally, I combine all the spaces served by a single VAV box into one
> thermal zone for modeling purposes. The ASHRAE 90.1 User’s Manual, p.G-19
> has reasonable guidance on defining “thermal blocks”. Where HVAC zones have
> been designed, zones can be combined into thermal blocks for modeling
> purposes when all these conditions are met (paraphrasing here):
>
> 1.)     The spaces have the same load and schedule characteristics.
>
> 2.)     Exterior zones with glazing must have the same, or similar
> orientation.
>
> 3.)     Zones must be served by the same HVAC system or by the same kind
> of HVAC system.
>
>
>
> Chances are that the zones/spaces served by a single VAV box will meet
> these criteria in a properly designed HVAC system.
>
>
>
> Regards,
>
> Bill
>
>
>
> *William** Bishop, PE**, BEMP, LEED® AP **|** **Pathfinder Engineers &
> Architects LLP***
>
> Mechanical Engineer
>
>
>
> 134 South Fitzhugh Street                 Rochester, NY 14608
> T: (585) 325-6004 Ext. 114            F: (585) 325-6005
>
> wbishop at pathfinder-ea.com           www.pathfinder-ea.com
>
> P   Sustainability – the forest AND the trees. P
>   ------------------------------
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Rob Hudson
> *Sent:* Friday, November 12, 2010 9:22 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Thermal Zones
>
>
>
> Hypothetically speaking, if i have a proposed design of a packaged VAV
> system where each VAV serves a range from 1 to 3 rooms, does my baseline
> design make the rooms serves by each VAV box a thermal zone or is each and
> every room its own thermal zone?
>
> So if i have 10 VAV boxes each serving 3 rooms, is it 10 thermal zones or
> 30 thermal zones?
>
> --
> Rob Hudson
>



-- 
Rob Hudson
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