[Bldg-sim] Ground/Water reflectance

[Lars O. Grobe]

Hi Alex!

> This project is a retrofit and they talked of having intense heat
> along the facades facing the water. Perhaps it’s more due to the
> tinted single-pane glass that gets hot (?) but my initial thought was
> the water is the culprit.

A large water surface means little shading - combined with tinted large 
glazing, sounds hot, yes ;-)

> I looked through a previous project and didn’t see the term
> “GND-REFLECTANCE” anywhere in the inp or pd2 files. Is the default to
> have a ground-reflectance of 0? If so, I guess I’ll run one case with
> 0, and one with 0.05… although I doubt there will be much difference
> between the two.

I know nothing about your software. Your reflectance values still appear 
to be very low. 0.05 is more or less black in my understanding. For 
water, I'd assume albedos between 0.05 and 0.20. For dry ground, typical 
albedos are 0.20-0.30, snow e.g. can go up to 0.90.

Cheers, Lars.

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