[TRNSYS-users] Zenith angle/Problem with meteonorm indian weatherfile

[xi chen]

Dear:

Actually I would like to ask similar questions about Type 109 and Type 15-3.
I used weather data of Beijing from TRNSYS weather data folder for type 109
and from Energy plus website for type 15-3, but quite different daily
integrated solar radiation for a tilted surface is obtained. I am really
confused about such results.

Yours sincerely

Patrick

2010/10/25 <trnsys-users-request at cae.wisc.edu>

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>   1. Zenith angle/Problem with meteonorm indian        weatherfile
>      (thiemann.stefan at vdi.de)
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>
> ---------- 已转发邮件 ----------
> From: <thiemann.stefan at vdi.de>
> To: <TRNSYS-users at cae.wisc.edu>
> Date: Sat, 23 Oct 2010 19:10:51 +0200
> Subject: [TRNSYS-users] Zenith angle/Problem with meteonorm indian
> weatherfile
> Hello,
>
> I would like to pick up a subject already metioned on 7.July 2010
>  concercing the incidence angle.
> Comparing Type 109 with Type 15 for a TMY2-file I noticed some
>  differences in the zenith anlge especially near sunrise and sunset.
>  When the sun is down Type 109 is 99° (??) while Type 15 ist nearly
>  (approx. 2-3 degrees lower) than 90°. But why?
> Is there any Trnsys convention on the definition of the zenith angle
>  during the night?
>
> I have another problem concerning indian weatherfiles. Calculating the
>  solar radiation for vertical facades on the east and west I got very
>  different and strange results. Does anybody know about a similiar
>  problem?
>
> Thank you, Stefan
>
>
>
>
>
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