Radiation calculation problem

Hello Mostafa,

I am using the Radiation analysis component. The result is always 0

and I have noticed that the output of the GenCumulativeSky component,

the GenCumSkyResult is always 0 in all the items. The epw weather file and

the GenCumulativeSky.exe are working properly. Can you imagine some issue?

I attach an image of the definition. As you can see from the Panel attached to the

genCumSkyResult output all the items are 0 (up to the 25th line is visible but also

all the others are). The report output says that "There were 3 sun up hours in this climate file", is it ok? Thank you.

Best

Francesco

Replies are closed for this discussion.

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on June 6, 2013 at 5:34pm

It might be because the radiation is 0 during the time that you are running the study? As far as I can see it is Manila Philippines. I don't know about the climate in Philippines that much. Did you try to draw the sunPath for the same time and overlay the radiation on top of it? You'll be able to see what is the sky condition at that time.

Hope it helps,

Mostapha

Permalink Reply by Francesco De Luca on June 8, 2013 at 9:04am

Hello Mostapha,

the period you can see from the screenshot.It is from 21 April 12:00 to 21 June 13:00. I don't think therer is something wrong there, isn't it? It gave me the same result also with Rome epw weather file. Thank you.

Best

Francesco

Permalink Reply by Mostapha Sadeghipour Roudsari on June 8, 2013 at 9:48pm

Hi Francesco! Do you want to upload the definition or email it to me so I can take a look.

Permalink Reply by Mostapha Sadeghipour Roudsari on June 6, 2013 at 5:37pm

For the next release I'll graft the output for each test surface so you can run it all using one component and get the result for each individual surface.

Permalink Reply by Francesco De Luca on June 8, 2013 at 9:06am

Mostapha, you mean that the calculation goes wrong because I am using three Solar Radiation at the same time? Anyway it's strange that the GenCumSkyResult output returs always 0 in all the items.

Permalink Reply by Mostapha Sadeghipour Roudsari on June 8, 2013 at 9:49pm

I didn't mean that. Sorry if I wasn't clear. The result will be the same regardless of the number of the components... You are right that the result form GenCumulative sky is strange.

Permalink Reply by Devang Chauhan on June 22, 2013 at 11:04pm

Hi Francesco,

I had similar problem. If the geometry you are trying to use for analysis is a surface then you should give it some thickness or turn that into a solid. It worked for me. Hope this helps.

Permalink Reply by Mostapha Sadeghipour Roudsari on June 26, 2013 at 1:07pm

Hi Devang! I assume it should be a normal direction problem in your case. You could only flip the surface to solve the problem. In this case the result of the genCumulativeSky causes the 0 result.

Francesco! I received the file. I'll check it and get back to you as soon as I get a chance.

Permalink Reply by Devang Chauhan on June 26, 2013 at 1:14pm

Hi Mostapha, Since I was running daylight simulation with diva with the same geometry, First thing I made sure was that the surface normals were pointed in right direction. However, giving some thickness to geometry easily solved my problem.

Thanks,

Permalink Reply by Mostapha Sadeghipour Roudsari on June 26, 2013 at 1:20pm

Interesting! Then could it be because all the points were receiving the same amount of radiation and so they were all the same color (blue)?

Permalink Reply by Devang Chauhan on June 26, 2013 at 1:23pm

I don't think that was the problem. I also checked the total radiation value in KWh. It was 0.

Permalink Reply by Mostapha Sadeghipour Roudsari on June 26, 2013 at 1:24pm

If that is the case then you may have found a bug. I'll be happy to take a look.