Question about Hb_Therm Boundary Condition

[chris]

@Sadmummy ,

This discussion has some information about how to customize the boundary conditions:

THERM - Control over BC Radiation Model

Grace and Jonathan, Thank you so much for all of the information. I also did some research over the last few hours and I can confirm that you are correct. NFRC states that we’re supposed to use a black body with view factor 1 for the exterior. Accordingly, I have set this as the default whenever anyone plugs in the words ‘outdoor’ for the film coefficient or plugs in a convective film coefficient greater than 10 W/m2K (which is pretty certainly an outdoor condition). You can see the changes …

The “Custom Rad Environment” component allows you to change pretty much all of the parameters of the boundary conditions you might need to change.

This said, I didn’t expose the use of the simplified BC model in Honeybee and all of the Honeybee THERM exports use the comprehensive model. I did this because you should be able to get matching results with the simplified model by customizing the comprehensive model with the right inputs. Is there a particular reason why you need the simplified model? I know NFRC does not use it and I’m curios to know if there’s some standard that requires it.