Dynamic U-values in E+ and Honeybee

Hey guys,

Is it possible to have dynamic u-values in E+?

If I create a material with a certain conductivity and a schedule, that accounts for the changes in the conductivity over the year, how do I get E+/the honeybee components to couple the two?

If not does somebody have an alternative suggestion to account for the changes of the u-value?

Thanks!,

/Christian

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Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on December 10, 2015 at 11:02am

This is a very interesting question and I don't know the answer to it. One of my students is currently working on a connection between Grasshopper <> WUFI and he needs a similar process. I think the right place for get an answer for this is unmethours.com. I posted the question there and we'll see if anyone can help us with this: https://unmethours.com/question/13279/change-u-value-of-constructio...

Permalink Reply by Christian Kongsgaard on December 10, 2015 at 1:18pm

Thanks for the help and reposting the question.

Btw I have found some errors in the code of some of your components. Is there a place I can send/post a description of the errors?

Permalink Reply by Mostapha Sadeghipour Roudsari on December 10, 2015 at 2:18pm

Sure! You can post them on github as an issue (https://github.com/mostaphaRoudsari/Honeybee/issues/new) and we will get back to you as soon as we can. You can search through the current issues and see if someone else has already reported them (https://github.com/mostaphaRoudsari/Honeybee/issues). Thanks.

Permalink Reply by Chris Mackey on December 13, 2015 at 1:50pm

Christian,

That's a very good question that I have also wanted to know the answer to for some time. The only thing that I know might get close to addressing your issue is modeling insulated blinds with a dynamic schedule:

For just modulating the U-Value of a typical wall or window construction, it seems like you will have to go with the intense EMS option that Jeremy mentions on Mostapha's unmet-hours post. I have wanted such a feature to help me more accurately model operable windows that are in an open vs closed state. If I end up developing anything to help with an EMS workflow like this, I will let you know.

-Chris

Permalink Reply by Chris Mackey on December 13, 2015 at 10:11pm

Christian,

I was browsing through the EnergyPlus reference and I realized that there may be a simpler way to get a dynamic U-Value with this object:

http://bigladdersoftware.com/epx/docs/8-0/input-output-reference/pa...

I don't have time to fully test it out now but I would suggest looking there before going for the EMS option.

-Chris

Permalink Reply by Mostapha Sadeghipour Roudsari on December 21, 2015 at 5:13pm

Chris, As far as I can see this case only works in case of using temperature as the trigger or am I missing something that you can modify it to be used in other cases?

Permalink Reply by Chris Mackey on December 28, 2015 at 4:00pm

Mostapha,

Yes, it seems to be only for temperature (not even a schedule). I get the sense that it is meant to be used to account for materials that change their properties with their temperature (like water/ice).

-Chris

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