Strange Error with Ladybug_Radiation Analysis following update

Replies to This Discussion

Permalink Reply by Omid Rashidi on February 6, 2017 at 8:52pm

Hi Elzine,

please find attached.

Regards,

-Omid.

Attachments:

• 170207SolarRadiationAnalysis_OMD.gh, 478 KB

Permalink Reply by Mostapha Sadeghipour Roudsari on February 7, 2017 at 6:52am

Thanks Omid! What was the issue in this case?

Permalink Reply by Omid Rashidi on February 7, 2017 at 9:10am

Hi Mostapha,

The problem was about "_disFromBase input. In original Ely's file, as a distance from the surface: There were numbers of surface geometry that called "Evolution Surface". Anyway, that not worked. I changed that with a number then it worked.

Kind regards.

Omid.

Permalink Reply by Chris Mackey on February 9, 2017 at 7:15pm

Elly,

I just added type hints on three the Ladybug analysis components so you should not have this issue again:

https://github.com/mostaphaRoudsari/ladybug/commit/9904949034eecf02...

Also, I see that you are trying to use the context transmittance input on the radiation analysis and I have to say that I decided to remove this after I was given a few scenarios of how new users might easily misunderstand it and get incorrect results. Instead, I recommend that you model this with Honeybee, which is a safer and more fool-proof way of accounting for radiation that has to pass through several surfaces with the same transmittance.

Thanks for bringing the type hint issue to our attention.

-Chris

Permalink Reply by Elzine Braasch on February 9, 2017 at 7:53pm

Hi Chris,

I did notice the input was missing in the updated versions, I ended up using the one you had for us before the alteration purely so I could get some indicative images to use in a memo to demonstrate only on a visual basis the differences.

I moved to using Honeybee's Radiance analysis, but was stumped when I was faced with the issue of getting hourly results from it =/ (I needed to provide our CFD modeller the radiation values for the measurement points so they could do an outdoor thermal comfort study) I couldn't find any components which would allow me to grab hourly radiation outputs, so instead, I set up a parametric model to simulate a grid analysis (whereby the hours in the skyfile were parametrically changes) and put the simulation type to Radiation, set it to record the results into an excel sheet, and then produced a macro to combine all the data 500 simulated results into one spread sheet..

It was a bit of a loop, but we got there in the end!!

Could I perhaps request a means to grab hourly radiation data from the Radiance simulation? It is very simple to grab illuminance, but for the life of me I couldn't find the radiation files =(

- Elly

Permalink Reply by Mostapha Sadeghipour Roudsari on February 11, 2017 at 10:01am

This is quite straight forward to do with Honeybee[+] if you're willing to give it a try. Mean while you can also use Daysim / annual recipe for this purpose. Change the output units, and then load the hourly data.

Permalink Reply by Elzine Braasch on February 11, 2017 at 12:57pm

Ah, I knew there was something I was missing! =D Thanks Mostapha!

Permalink Reply by Elzine Braasch on February 9, 2017 at 7:55pm

Hi Omid,

Thanks for the spot! I had copied the component workflow from the example file on Hydra, so I would suggest that file be updated so others don't have the same issues!

I eventually figured it out when I previewed the grid test points and found they were off in weird distances and locations o.O

Thanks!