[Equest-users] Modeling cool roof

[Chris Jones]

Cool roofs work to reduce the cooling load.  For uncooled warehouses, 
the cool roof serves to increase heating costs.

In southern Ontario, I have seen very few projects, with mechanical 
cooling, where there is a net gain in energy savings when examining 
"cool" roofs as an ECM.  In most cases, the extra cost for the 
reflective roof does not have a viable payback.

At 01:11 PM 09/06/2012, Nathan G wrote:

>All,
>
>
>
>We need to model a cool roof ECM on an industrial complex.
>
>I have researched the archives and did not find any guidance how to 
>accommodate the cool roof properties.
>
>
>
>As a preamble lets me briefly describe how cool roof is characterized:
>
>
>
>Cool roof thermal properties:
>    * Solar Reflectance
>    * Thermal Emittance.
>    * R-Value
>
>A Cool Roof Minimizes The Solar Heat Gain of a Building by First 
>Reflecting Incoming Radiation, Then by Re-emitting the Remaining 
>Absorbed Portion.
>
>Sun radiation hits the roof, the fraction of solar energy that is 
>reflected by the roof is called Solar Reflectance (SRI), some heat 
>is absorbed by the roof and transferred to the building.
>
>The relative ability of the roof surface to radiate back absorbed 
>heat is termed Thermal Emittance.
>
>Cool roofs increases substantially SRI and TE
>
>As a Result, The Cool Roof Stays Cooler than a Traditional Roof of 
>Similar Construction.
>
>Some cool roof products also has a layer of additional insulation
>
>
>
>eQUEST currently has only R-Value to specify
>
>Can someone please advise how can we take into account the SRI and TE as well
>
>Thanks,
>
>
>
>Nathan Guedalia, CTO
>
>Equidex Energy
>
>P.O. Box 566
>
>41 King Place
>
>Closter NJ 07624
>
>Tel: (201) 306 0660
>
>Fax: (201) 784-0854
>
>
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 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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