[Equest-users] Modeling cool roof

[Nathan G]

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:

a.	Solar Reflectance
b.	Thermal Emittance.
c.	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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