Honeybee hourly solar radiation

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on April 11, 2015 at 11:05am

Hi Mihail,

1. You can use Honeybee to model radiation with Radiance. There you can define the materials for every surface and it will calculate the reflections.

2. If you are looking to get hourly values for all hours of the year then you need to run an annual analysis. Use DSParameters component to change the study to radiation rather than illuminance. The rest is very similar to annual daylight analysis.

If you haven't done any daylight simulation with Honeybee before there are couple of example files here: (https://app.box.com/s/znns0dtewd1tclicx74q) and here is a full workshop (https://www.youtube.com/playlist?list=PLkjfDmSc5OryXkWSt57ltJFU4qXD...).

Mostapha

Permalink Reply by Mihail Todorov on April 13, 2015 at 1:10pm

Hi Mostapha! 

Thanks for the reply and the links! 

I am trying to do this now, but I run into some problems:

1. If I use the Daysim component where should I generate the sky from? Since there is no sky my analysis doesn't run. Earlier, I have tried the hourly solar analysis using the Grid-based, where I can generate a sky, but then I have to run 8760 simulations, which takes quite a long time. 

2. If I want to examine 1 surface (PV panel) and I want to have surroundings, which are not taken into the analysis, but still generate shading and reflections, there is no input to the analysis component?

Mihail

Attachments:

• solar analysis.PNG, 99 KB

Permalink Reply by Peter Zaťko on April 13, 2015 at 3:14pm

Hi Mihail,

1) your skies are generated automaticaly from epw weather file
2) your test mesh will be on the PV panel, and all the surroundings and also the PV panel with RAD materials should be connected as HBObjects,

from that picture for me your set up look OK, if you followed Mostaphas Video and downloaded the example file that should work.
One thing what I do is put just one toggle to Write rad and Run rad, (but I chceck my geometry before that) , so it will write the rad file and run it immediately after, but for beggining is good to first just write the rad file, chceck the geometry and than run it

regards

Peter

Permalink Reply by Mihail Todorov on April 13, 2015 at 3:57pm

Hi Peter,

Thanks for replying! 

'So for the sky then I guess it uses a climate based sky for every hour, if I am not wrong. How does this perform compared to the GenCumulativeSky? I want to achieve as accurate irradiation as f.x you can get from DIVA (but there you cannot get the hourly irradiation).

Can you please look at the files, because I have done everything, I think, but when running the simulation it says that there is no light source, ending up with no results?

Attachments:

• Untitled.3dm, 51 KB
• Hourly solar.gh, 105 KB

Permalink Reply by Peter Zaťko on April 13, 2015 at 5:02pm

Hi Mihail,
The error : no light source- is for the interior lights (so it s not for you (now))
and it ending up actuaaly with the result of .ill files, you just need to read them as the daylighting results but instead of LUX you have KWh/M2 or WH/m2,
I added to your definition some "readers" where you can go through the whole year every hour, or period of time etc. you just need to read the results from the .ill file :)
and DIVA- so this is actually the same , it uses the same Radiance programs for calcs, and I found HB_LB more powerful than DIVA and easier to visualize the results 

regards

Peter

Attachments:

• Hourlysolar.gh, 446 KB

Permalink Reply by Mihail Todorov on April 14, 2015 at 4:59am

Hey Peter,

Thanks for the help! Everything is working perfectly :) HB_LB indeed is a very powerful tool

All the best

Mihail

Permalink Reply by Mostapha Sadeghipour Roudsari on April 21, 2015 at 6:00pm

Thanks Peter for your help. Just a minor correction here that Honeybee and DIVA are both using Daysim for annual analysis. Daysim uses a modified version of Radiance under the hood so you are technically correct! :)

Permalink Reply by Mihail Todorov on May 6, 2015 at 5:03am

Thanks for the clarification Mostapha! 

I am interested, what is the difference in the modified version of Radiance?

Permalink Reply by Mostapha Sadeghipour Roudsari on May 6, 2015 at 9:56am

Hi Mihail, To start you can check this paper for the details about how Daysim works:

Bourgeois D, Reinhart CF, Ward G, “A Standard Daylight Coefficient Model for Dynamic Daylighting Simulations” Building Research & Information 36:1 pp. 68 – 82, 2008.

There are more here: http://daysim.ning.com/page/publications

Permalink Reply by Mihail Todorov on May 6, 2015 at 12:48pm

Thanks! I will check them out.