[Radiance-general] Sun angles,

[G V DEEPAK]

Thanx a lot ...
On Mon Mar 23 14:12:40 EDT 2009, tbleicher at arcor.de wrote:

>  At a first glance the script seems fine.
> 
> But your problem is most likely that gensky does not know about 
> the
> absolute irridiance values of a particular sky. It only creates a 
> distribution
> pattern with an unspecified total value. If you want to create a 
> sky with
> ie. 50000lux you can specify this with one of the -b/-B or -r/-R 
> options.
> 
> You can find typical values for the sky illuminance at your 
> location in
> climate data files which are available for various energy 
> simulation packages.
> 
> Regards,
> Thomas
> 
> 
> ----- Original Nachricht ----
> Von:     G V DEEPAK <deepak.gv at ufl.edu>
> An:      Radiance general discussion 
> <radiance-general at radiance-online.org>
> Datum:   23.03.2009 18:38
> Betreff: [Radiance-general] Sun angles,
> 
>> Hello Everyone,
>> 
>> I am trying to find illuminance values on an yearly basis, I am 
>> expecting to get different values for different seasons. Say if 
>> we compare between march nad december, we should get higher 
>> values of illuminance for december as compared to march. But I 
>> am getting almost same values for both the months.
>> 
>> I am not sure if the software is considering sun angles in 
>> calculations.
>> 
>> I am running this script to find the values,
>> 
>> 
>> 
>> #!/bin/csh -f
>> 
>> set mon=12
>> set month=March
>> set day=21
>> set coord=(-a 30.00 -o 82.35 -m 84)
>> rm $month.out
>> while($day<23)
>> foreach hr(08 09 10 11 12 13 14 15 16 17)
>> echo "hr=$hr"
>> set skypar=($mon $day $hr +i $coord)
>> echo "$month/$day/$hr">>$month.out
>> oconv room.rad '\!gensky '"$skypar" sky.rad>hr.oct
>> mkillum -ab 0 -ad 1024 -av 0.1 0.1 0.1 hr.oct "<" 
>> windowillum.rad>illumination.rad
>> oconv -i hr.oct outside.rad Conv-0.rad illumination.rad>hour.oct
>> rtrace -h -I -ab 1 -ad 4096 -as 128 -av 0 0 0  
>> hour.oct<mainsamplesupwards.inp|rcalc -e 
>> '$1=47.4*$1+120*$2+11.6*$3'>>$month.out
>> #`./newglares.csh hr.oct $month.out`
>> echo " ">>$month.out
>> rm hr.oct
>> end
>> @ day++
>> echo "day=$day"
>> end
>> 
>> 
>> Let me know if there is anything wrong with this.
>> 
>> Thank you
>> 
>> 
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>> 
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G V DEEPAK
Graduate Research Assistant
M.E. Rinker, Sr. School of Building Construction.
University Of Florida.