Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
E+ (and most of the other energy simulation programs) cannot calculate a U value, it's need to be manually calculate before passing it to the program.
U value taking account of linear transmittance is a relatively new topic, but the report AHSRAE RP-1365 seems to reach consensus. This study generate a new method which is well resume in "Building Envelope Thermal Bridging Guide". With your calculation you need to introduce the Area of the wall concerned by the linear transmittance. check on the guide p18/37:
https://www.bchydro.com/content/dam/BCHydro/customer-portal/documents/power-smart/builders-developers/building-envelope-thermal-bridging-guide-1.1.pdf
