Hi:
Does anyone know how to calculate the thermal bridging of steel stud walls?? I have a wall with 6" metal studs, 16" OC, with R39 cavity insulation and R10 CI. Table A3.3.3.1 in 90.1-2013 does not go above R21.
Thank you,?Paul Diglio
Paul,
Chapter 27.5 in the ASHRAE Fundamentals provides examples for calculating the effective R-value for where there is steel studs creating a thermal bridge.
Hi Paul,
Section A9.2(b) directs you to do a parallel path calculation using the modified zone method. The Modified Zone Method for Metal Stud Walls with Insulated Cavities is described in 2017 ASHRAE Handbook ? Fundamentals, p.27.5.
Regards,
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer
[Pathfinder-EA-logo-2]T: (585) 698-1956 F: (585) 325-6005
bbishop at pathfinder-ea.com www.pathfinder-ea.com
[cid:image006.png at 01D42F05.5D5FFA20]134 South Fitzhugh Street
Rochester, NY 14608 Ask me why Carbon Fee & Dividend may be right for you.
*****Pathfinder?s Summer Hours begin June 4th. Our switchboard and office will be closed at noon on Fridays through August 31st.****
Alternately, I use the EE4 modeling program from NRCan. EE4 is a simplified GUI to DOE2.1e. It includes an envelope performance calculator that accounts for different types of thermal bridges. It has many built in materials and you can add custom materials. I use EE4 to establish the envelope performances then I define my eQuest materials and layers to match.
You would have to install EE4 using a virtual machine with XP. It won?t run on 64 bit Windows machines.
Paul,
Chapter 27.5 in the ASHRAE Fundamentals provides examples for calculating the effective R-value for where there is steel studs creating a thermal bridge.
Christopher R Jones, P.Eng.
T+ 1 416-644-0252
[cid:image002.png at 01D42F05.25BA1100]
Hi Paul,
Section A9.2(b) directs you to do a parallel path calculation using the modified zone method. The Modified Zone Method for Metal Stud Walls with Insulated Cavities is described in 2017 ASHRAE Handbook ? Fundamentals, p.27.5.
Regards,
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer
[Pathfinder-EA-logo-2]T: (585) 698-1956 F: (585) 325-6005 www.pathfinder-ea.com
bbishop at pathfinder-ea.com
[cid:image006.png at 01D42F05.5D5FFA20]134 South Fitzhugh Street
Rochester, NY 14608 Ask me why Carbon Fee & Dividend may be right for you.
*****Pathfinder?s Summer Hours begin June 4th. Our switchboard and office will be closed at noon on Fridays through August 31st.****
Alternately, I use the EE4 modeling program from NRCan. EE4 is a simplified GUI to DOE2.1e. It includes an envelope performance calculator that accounts for different types of thermal bridges. It has many built in materials and you can add custom materials. I use EE4 to establish the envelope performances then I define my eQuest materials and layers to match.
You would have to install EE4 using a virtual machine with XP. It won?t run on 64 bit Windows machines.
https://www.nrcan.gc.ca/energy/software-tools/7453
Christopher R Jones, P.Eng.
T+ 1 416-644-0252
[cid:image001.png at 01D42F06.B823A500]
Thanks Christopher and Bill?Paul Diglio