ladybug-tools/honeybee-legacy

What are the R/U-values of the insulation materials?

Closed this issue · 3 comments

emccormi commented

I've recently started using the THERM plug in - great job and THANK YOU! I'm a little confused, though. Honeybee seems to think that my insulation materials are windows? I'm trying to identify the R-values (SI) and nothing is popping up with the Decompose EP Construction command. Why is it saying "
hb1
hb3
hb2

"?

saeranv commented

@emccormi It's best to post these kind of questions on the Ladybug-tools forums: https://discourse.ladybug.tools/

My guess on what is happening here is that because unlike in E+, a THERM R-value (m2K/W) is based on thickness taken from an input geometry. Therefore the THERM material definition doesn't include R-value, it must be derived from the provided geometry and the conductivity value.

That's why conductivity is provided instead. If you want to find the R-value, just take the conductivity (provided), and just: 1/(conductivity / thickness ), where thickness is taken from your input geometry.

emccormi commented

Thanks, I knew there had to be a better place to post. Thanks also for your feedback - I'll look into calculating the R value from the conductivity.

chriswmackey commented

Thanks for taking care of this @saeranv . I'm closing out this issue and I'll see you on the forums!