[Bldg-sim] ASHRAE question

[Rob Hudson]

My original response to the question was it was designers preference.  This
seems to be not entirely wrong, as it could be clients preference or space
use that has some influence on the designers choice of design conditions.
Thanks for you input.

On Tue, Jun 22, 2010 at 11:29 AM, Seth P. Spangler <sspangle at rmf.com> wrote:

>  Rob,
>
>
>
> I have never read specific conditions of when to use one over the other
> however typically the conditions used are dictated by the type of building.
> In my experience buildings with low tolerances for temperature change use
> the 99.6%/0.4%. These buildings would include hospitals, laboratories, R&D
> etc. Buildings with a high level of tolerance will use 99%/1%. These
> buildings are typically office buildings, higher education, retail etc.
>
>
>
> In the past six months I have seen a huge change in design conditions. The
> latest owner has specified design conditions of ASHRAE 99%/1% with Summer
> indoor of 78 deg F/50%RH and Winter indoor of 68 deg F. However, they want
> the thermostat set point to be 73 deg F year round.
>
>
>
> Seth Spangler, LEED® AP
>
>
>
> RMF Engineering, Inc
>
> Ph: (843) 971-9639 ext:1497
>
> Fax: (843) 971-9641
>
> sspangle at rmf.com
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Rob Hudson
> *Sent:* Tuesday, June 22, 2010 11:15 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] ASHRAE question
>
>
>
> I was asked what influences an engineers decision over design conditions,
> and after looking for some textural support in the books, i could not find
> anything to give guidance over when to use 0.4/1/2 or 99/99.6 % design
> conditions.  Does anyone know if this text exists in the ASHRAE books and if
> so which chapter?  I also looked into ASHRAE 90.1, but that only addresses
> efficiencies of equipment and not the design conditions/capacity
> calculations.
>
> Thanks in advance,
>
> --
> Rob Hudson
>



-- 
Rob Hudson
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