[esp-r] Re: g-value of glass

[Aizaz Samuel]

Leen,

The standard is BS EN 410:1998 as you rightly said. The standard gives 
formulae assuming spectral properties are known. Within the code this has 
been simplified for monochromatic light, so the output you get from ESP-r 
makes some assumptions. All that ESP-r does is report g-values. These are not 
used in calculations and there is no impact on thermal results.

Regards,
Aizaz

On Sunday 22 February 2009 10:56, Leen Peeters wrote:
> Paul,
>
> there is, but it does not work. Furthermore, I found in the mailinglist (2
> years back, I think) that the calculation of the g-value is based on a
> standard (En 410 if I remember well) and that the actual g-value is indeed
> based on a range of assumptions. However, I find no info on the kind of
> assumptions made, nor on there possible impact.
>
> So, if anyone could provide me with that....
> ________________________________________
> From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk]
> On Behalf Of Paul Strachan [paul at esru.strath.ac.uk] Sent: 21 February 2009
> 15:56
> To: Leen Peeters
> Cc: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: g-value of glass
>
> Leen,
>
> There is a calculation based on some standardised assumptions if you go
> into the constructions database and choose the "view g-value" option.
>
> Paul
>
> Leen Peeters wrote:
> > all,
> >
> > could anyone explain me how I can calculate the g-value of a certain,
> > user added, glazing type?
> >
> >
> > thanks!
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