[Bldg-sim] what HVAC system type for a building with residential and nonresidential?

[Cheney]

Hi zhiren,

Please note ASHRAE has published addendum for your option 1. According to
Addendum W to 90.1-2007:
" Where attributes make a building eligible for more than one *baseline *system
type, use the predominant condition to determine the system type for the
entire building except as noted in Exception a to Section G3.1.1."

So there is no conflict between the two options.

-- 
Regards,

Cheney

LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b


On Tue, Dec 14, 2010 at 6:19 PM, zhiren zhou <zhouzr at cabr-sh.com> wrote:

>  Dear all:
>
>          My project is a 84- floor super-high building with 27 floors for
> office and 47 floors for residential(hotel and apartment) and others for
> retail and equipment floors. When I select baseline HVAC system I’m confused
> as both the two option below sounds rational:
>
> 1)       The Note under TABLE G3.1.1A- Baseline HVAC System Types in Page
> 181 of ASHRAE 90.1 tells that : “Where attributes make a building eligible
> for more than one baseline system type, use the predominant condition to
> determine the system type for the entire building.”
>
> 2)       The explanation in Page G-23 of ASHRAE 90.1 MANUAL tells that :
> “If a building has both residential and nonresidential spaces with their
> total conditioned floor area both greater than 20,000 ft², for instance a
> residential tower with retail and restaurants at the base, then the HVAC
> system type is determined separately for the residential and nonresidential
> portions.”
>
> So if I follow option 1 I should select PTAC for the whole building which I
> think unsuitable. else if I follow option 2 I should select PTAC for
> residential and VAV for office and others.
>
> Which option should I follow?
>
> Could anyone tell me? Thanks
>
>
>
>                                                         Zhiren ZHOU
>
>
>
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