[TRNSYS-users] About Shading masks (type 67) and Overhang and wingwalls shading (type 34)

[Diego A. Arias]

Hi Christophe,

It is a very good idea. I do not want to promise it, but I think it is 
very likely to have this with the development of the new shading component.
Thanks,

Diego

Enertech wrote:
> Hi Diego and all TRNSYS Users,
>
> Diego, I agree with you : for my job, the topic of shading is a 
> central problem and we absolutly need a simple model to treat them. We 
> will be very thankful if you develop this kind of tool.
>
> I have a suggestion about this topic. In attached file, you can see a 
> solar diagram corresponding to a 45°N latitude. It will be useful to 
> have a model with a graphic plugin, a solar diagram corresponding to a 
> x°N or S (x = parameter), and the user define graphically shadings. In 
> this manner, you can define all the shadings of a surface, fareway 
> masks, wingwalls and overhang and also some kinds of masks wich are 
> not fareway (sun is shadded if its angular height is less than the 
> angular height of the mask) and not overhangs (sun is shadded if its 
> angular height is higher than the angular height of the mask), as 
> alleyways for example.
>
> Do you think it’s possible to develop this kind of model ?
>
> Best regards,
> Christophe
>
> At 22:07 19/04/2007, Diego A. Arias wrote:
>> Hi Fabien,
>>
>> Thanks for looking into the details of this topic. I am afraid that you
>> found a bug. Both components were developed separately over the years,
>> and they may not be giving the right results when combined.
>> Sorry if this creates inconveniences. We are currently working on
>> another solution that will combine both shading sources, overhangs and
>> far away objects into a single component.
>> Best regards,
>>
>> Diego
>>
>> > Can anyone, have a look on my simulation ?
>> >
>> > I don't understand the results.
>> >
>> >
>> >
>> >
>> > I try to compare 2 types 34 :
>> > - the first is combined with a type 67 (parameter 1 = 1)
>> > - the second is not combined with a type 67 (parameter 1 = 0)
>> > See the results.
>> > Usually, 0 < FSS < 1 same the second type 67
>> > but the first : -1 < FSS < 1 !!!!
>> >
>> > In more, I try to compare 3 inputs of type 34 in the 2 cases
>> > See the results.
>> > With a type 67 but no masks (see the ***.dat) I don't have the same
>> > result !!!!
>> >
>> > Thanks.
>> >
>> > 
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>> >
>>
>>
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>
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-- 
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706