Set the shading schedule with Daysim/Honeybee

Hi,

I am using Honeybee/Daysim to run an annual daylight simulation with a dynamic blind system. I have read that there are two methods to set the blinds schedules:

- 1. When there are 50w/m2 on the window

- 2. When there is more than 40% of the interior sensors that surpasses a certain illuminance threshold.

I think I figured out how to do the second option (see picures below)

But what about the first one? how can I set the exterior sensor to check for the 50W/m2 on the window?

Thanks in advance,

Alejandro

Replies are closed for this discussion.

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on November 3, 2015 at 5:59pm

Hi Alejandro,

You should use Glare control recipe to introduce external sensor. There is a threshold that can be set in lux and not w/m2. I'm not sure where 50w/m2 comes from. You can read more here about shading controls in Daysim (http://daysim.ning.com/page/daysim-shading-control-modes).

I believe there is an example file for setting up advanced dynamic shading modeling with Honeybee.

Permalink Reply by Ram Joshi on September 2, 2016 at 3:11am

Hi Mostapha,

I was wondering if a correlation between daylight and cooling energy can be established using the dynamic shading recipe since the daysim components use illuminance values (in lux) as triggers and E+ takes radiation (W/m2) as trigger. I mean even if I take out a lighting schedule from UDI analysis, it will be difficult to get the corresponding change in my cooling energy use. Any thoughts on this? Please let me know if I have not made myself clear.

Regards,

Ram

Permalink Reply by Ata Chokhachian on September 4, 2016 at 4:22am

Hi Ram,

I am trying to simulate dynamic shading with radiation thresholds on the facade in order to couple it with lighting schedule, did you find a way to input thresholds in w/m2 for honeybee?

Regards

Ata

Permalink Reply by Ram Joshi on September 4, 2016 at 10:19pm

Hi Ata,

Do you want to run E+ simulation? If so, you can create shading using E+ shading creator component and set the control type. Although there is no radiation threshold as there is in E+.

If you want to run an Annual daylight simulation and want to simulate lighting sensors, you can create lighting control group using the component of same name and set a threshold. This component works on the basis of illuminance. So, there is a difference of metric. Once, the annual simulation is run, you can extract the lighting schedule and feed it in to your E+ simulation.

Hope this helps.

All the best,

Ram

Permalink Reply by Ata Chokhachian on September 5, 2016 at 2:28am

Dear Ram

Thanks for your reply, this helps but I am not going to use the results in E+, I was thinking to run annual radiation on the facade and then create External shading schedule for daysim based on radiation thresholds. but I am not sure where to input External shading schedule in HoneyBee, Do you have any idea?

Permalink Reply by Ata Chokhachian on September 5, 2016 at 2:28am

External shading schedule (control keyword = AnnualShadingSchedule): Daysim uses an external shading file that detemrines the status of the dynamic shading systems at every hour in the year. The external shading profile should be a comma seperate file with a three line header and the format: month, day, hour, shading fraction [0,1] in each line. See sample file:BlindsAlwaysClosed.csv.

Permalink Reply by Ram Joshi on September 5, 2016 at 3:30am

Hi Ata,

You can do something with dynamic shading group which works on illuminance thresholds. See if it is something you are looking for.

Actually, I was working on a motorized fins project recently and for this I created my own algorithm. May be you would also like to do something like this. You can always use inherent LB+HB components to make your life easy in playing with weather data.

All the best,

Ram

Permalink Reply by Ata Chokhachian on September 5, 2016 at 6:40am

Thanks Ram,

convertng radiation values to illuminance seems to be a bit complicated in order to input as illuminance thresholds...

I wonder which values does Daysim use from .epw file?

does it get global horizontal radiation or global horizontal illuminance?

Best

Ata

Permalink Reply by Ram Joshi on September 5, 2016 at 11:14pm

It would use illuminance values.

Regards,

Permalink Reply by Mostapha Sadeghipour Roudsari on September 11, 2016 at 10:32am

Ata, I think you should open a new discussion and clearly explain what you need. Just to answer part of your question about converting irradiance to radiance you can use 179. See this: http://radiance-online.org/pipermail/radiance-general/2006-April/00...

Permalink Reply by LUIS ARTURO REYES VALENCIA on March 23, 2017 at 1:37pm

hello Ram,

I am trying to do exactly as yuo describe but I am having problems extracting the schedule from the annual simulation. Could you please describe the process?.

Thank you

Arturo

Permalink Reply by Mostapha Sadeghipour Roudsari on March 25, 2017 at 11:51am

Arturo, are you trying to use the annual schedule from daylight simulation for the annual daylight simulation? Have you checked the examples on Hydra?