[esp-r] Re: question about the Ish module

[glbrune at polimi.it]

Dear Achim, Jon, others,
I think that the rightest way to take reflectivity into account in the  
insolation calculations would be to treat reflextions with raytracing  
principles in the code of ish, but presently I don't feel capable of  
doing this, at least in a reasonable amount of time, and I don't know  
if I ever will. The kind of use of the existing coupling with Radiance  
I am thinking of is computationally redundant, but (i hope) it should  
also be reasonably simple to implement and wouldn't touch the ESP-r  
nor the Radiance existing code.

Both fortunately and unfortunately I will be able to work on it just  
part-part time in August. I will work on it mainly from September.

This functionality would be very useful to me in the next months.

Best regards

Gian Luca


> Def. Quota Geissler Achim <achim.geissler at fhnw.ch>:
>
>> Dear Gian Luca, Jon, others
>>
>> I agree that it would be very good to extend the properties of  
>> exterior obstructions with reflectance. We suggested this some  
>> years ago in context with the increasing use of quite reflective  
>> "Louvre" types of shading elements (brushed steel or aluminum,  
>> light grey or white carbon wings and similar) on commercial high  
>> rise buildings.
>>
>> Also, reflective obstructions would surely enhance the accuracy of  
>> calculated gains (and daylighting performance) for northerly  
>> elevations facing reflective opposite buildings.
>>
>> Recently, obstructions were extended for transparency. Therefore,  
>> the next logical step would be to add reflectivity. To my  
>> knowledge, none of the comparable simulation programs takes this  
>> into account, either.
>>
>> Best
>> Achim
>>
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: esp-r-bounces at lists.strath.ac.uk  
>> [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Gian Luca  
>> Brunetti
>> Gesendet: Dienstag, 2. August 2011 04:02
>> An: esp-r at lists.strath.ac.uk; jon at esru.strath.ac.uk
>> Cc: gianluca.brunetti at polimi.it
>> Betreff: [esp-r] Re: question about the Ish module
>>
>> I think that the main limitations of the program would be the following:
>> - it would underestimate the increase of insolations values in the  
>> case that even the gain of the most insolated surface turns out to  
>> be increased by the reflections due to obstructions, since that  
>> value is kept fixed to scale all the others
>> - nothing would be done to take into account the irradiation  
>> increase due to the reflections caused by the obstructions due to  
>> the sky diffuse component
>> - the computations would just regard interior surfaces and not exterior ones
>>
>>
>
>
>
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