[Equest-users] Roof Reflectiveness / Absorbency for cool roof

[Rob Hudson]

well, that makes me feel a little better.  now to explain this to my boss...

On Mon, Dec 6, 2010 at 2:10 PM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

>  Rob,
>
>
>
> When I model cool roofs using ASHRAE Standard 90.1 Appendix G, I change the
> absorptance of the roof construction to 0.55, per the reflectance=0.45
> allowance in Table G3.1. Energy savings may be modest, or even negative,
> depending on several factors, including climate, roof U-value, and
> electric-vs.-gas/heating energy rates. There are good discussions in the
> archives regarding the nuances of cool/white roofs.
>
>
>
> 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:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Rob Hudson
> *Sent:* Monday, December 06, 2010 1:58 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Roof Reflectiveness / Absorbency for cool roof
>
>
>
> i am trying to model a cool roof by changing the absorbency from 0.7 to
> 0.55.  it is the right approach? i am getting an increase in energy costs,
> which goes against logic.
>
> --
> Rob Hudson
>



-- 
Rob Hudson
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