Re: Overhang and wingwall shading

["Leszek" <lpudelko@xxxxxxxxxxxxxx>]

Michael,

Thank you very much for clear, exhaustive and accurate explanations of
defferent posibilities.

Dorota Pudelko


---- Original Message -----
From: "Michaël Kummert" <kummert@engr.wisc.edu>
To: <trnsys@relay.doit.wisc.edu>
Sent: Tuesday, January 07, 2003 11:04 PM
Subject: RE: Overhang and wingwall shading


> Dear Dorota,
>
> > I would like to know if it is the only way?
> > It would be complicated for me because i have
> > got 25 zones ( two windows >with overhang and
> > wing wall in each). Could you explain me when
> > I should use external shad. factor as option
> > in Windows' description in PREBID.
>
> It is possible to use ESHADE to approximate the shading effects due to
> overhangs and wingwalls. However, you have to use equations between Type
34
> and Type 56. One equation should be defined for each Type 34. The equation
> computes a shading factor:
> ShadFact=[1-(Tot. shaded rad.)/(Tot. unshaded rad.)]
>
> The Total shaded radiation is output 1 from Type 34 and the Total unshaded
> radiation is available from Type 16 (attention, input 5 of Type 34 is the
> incident BEAM radiation while you need the TOTAL radiation in your
> equation).
>
> In Prebid, you have to define the shading factor as an input. You can then
> connect the corresponding "ShadFact" equation to the Type 56 inputs in
> IISiBat.
>
> If I am right, there will be a slight difference between the solution here
> above and the solution described by David Bradley, because the diffuse
> radiation will not be treated in the same way. I don't think the
difference
> is too important unless you would want to study a particular shading
device
> or window in detail.
>
> The next Trnsys release will include a modified Type 34 which will output
> ESHADE directly, so you will not need the equations anymore.
>
> Michaël Kummert
>
> _________________________________________________________
>
> Michaël Kummert
>
> Solar Energy Laboratory - University of Wisconsin-Madison
> 1303 Engr Res Bldg, 1500 Engineering Drive
> Madison, WI 53706
>
> Tel: +1 (608) 263-1589
> Fax: +1 (608) 262-8464
> E-mail: kummert@engr.wisc.edu (*****NEW*****)
>
> SEL Web Site: http://sel.me.wisc.edu
> TRNSYS Web Site: http://sel.me.wisc.edu/trnsys
>
>
>

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