Uploaded byBronwyn Barry
Window Porn for Passive House
The document provides an overview of window design considerations for passive houses, emphasizing the importance of size, frame, and location in reducing heating demand. It also discusses the significance of accurate psi-install calculations for window performance and offers insights on commercial glazing updates and optimal solar gain strategies. Key conclusions include using tall, narrow windows, optimizing installations, and considering the benefits of higher solar heat gain coefficients (shgc) for improved energy efficiency.
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Window Porn for Passive House
- 1. WINDOW PORN forPassive House North American Passive House Conference, Portland 2010
- 2. Overview • Better Design:size, frame, location • Psi-install: the mystery unfolds • The other ‘install’ you need to know • Commercial glazing updates • Speculation on the glazed future
- 3. Design matters… A B CD $83.310.1324.17645 5/7D $83.560.1324.17049 3/5C 0.146229 5/8B-2 $121.23 0.14 24.1 6226 3/8B-1 0.1515 3/856A-3 0.1446 5/829 5/8A-2 $143.12 0.14 24.1 46 5/826 3/8A-1 $BTU/hr.ft2 .FSF(")(") Cost/sf U- installed TotalHtWidth Window
- 4. Frame size matters… Source:Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 Less frame, more glazing lowers your Heating Demand:
- 5. Location matters… Source: ProtokollbundNr. 37, Passive House Institute, Darmstadt, Nov. 2008 POOR: Uw(installed) = 0.85 W/m2K/m2K Psi-install = 0.033 W/m2K BETTER: Uw(installed) = 0.83 W/m2K0 W/m2K Psi-install = 0.028 W/m2K BEST: Uw(installed) = 0.83 W/m2KW/m2K Psi-install = 0.027 W/m2K EXTERIOR INSET CENTERED
- 6. Why Psi matters 3.714.210.0050.00850 3.734.240.0060.01130 4.84.290.0090.0160 kBTU/(ft²yr)kBTU/(ft²yr)(BTU/hr.ft.°F)(W/mK)(%) AHDSSHDΨΨΨΨInstallλλλλ Win Loc'n ft312312.25GrossEnclosed Volume ft2796Gross Heated Building Footprint Area ft21448.5Treated Floor Area My project: By moving the windows to the center of the wall the Annual Heat Demand was reduced by 22%.
- 7. Calculating Psi -install - ( ) = U*L*dT U*L*dT U*L*dT U*L*dT / dT = Psi +
- 8. Psi – installby numbers… 4.2917285.4020995.3590.8683 (%)(W/m)(K)(m)(W/m2K) errorULdTdTLU Combined assembly 4.8611561.5020292.6221.9755 (%)(W/m)(K)(m)(W/m2K) errorULdTdTLU Window Only 4.295820.0720702.7370.4141 (%)(W/m)(K)(m)(W/m2K) errorULdTdTLU Wall Only - = ( + ) -4.80820-96.16 (W/mK)(K)(W/m) UdTULdT Psi
- 9. Guide to psi-install1 Insulated PVC window in a masonry wall: Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 DISTANCE (Ueb): Exterior glazing to Exterior insulation (m) Psi(W/mK) Psi RANGE: 0.02 W/mK to -0.04 W/mK U frame: 1.1 W/m2K
- 10. Guide to psi-install2 Insulated PVC window in a wood wall: Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 DISTANCE (Ueb): Exterior glazing to Exterior insulation (m) Psi(W/mK) Psi RANGE: 0.045 W/mK to -0.015 W/mK U frame: 1.1 W/m2K
- 11. Guide to psi-install3 Insulated Fiberglass + wood window in a wood wall: Source: Protokollbund Nr. 37, Passive House Institute, Darmstadt, Nov. 2008 DISTANCE (Ueb): Exterior glazing to Exterior insulation (m) Psi(W/mK) Psi RANGE: 0.017 W/mK to 0.007 W/mK U frame: 0.7 W/m2K
- 12. Remember the otherinstall… Please - NO thermal bridge pan flashing! Sill pan under window to interior Flash often, but flash carefully!
- 13. Commercial glazing updates Source:Alex Wiilson, Environmentatl Building New, Vol 19, Nr. 7 – July 2010 – with permission
- 14. 3-pane works betterin all cases Source: Alex Wiilson, Environmental Building News, Vol. 19, Nr. 7 – July 2010 – with permission
- 15. Glazing, SHGC andefficiency Source: Steve Selkowitz, LBNL, by persmission
- 16. New research fromPHI… Source: Conference Proceedings, 14th IPHC, 2010 – Paper by Dr. Benjamin Krick, PHI, Darmstadt. Calculation of SOLAR BALANCE: ensuring net benefit of heat loss vs solar gain Ug-1.6 W/m2K x g < 0 (1.6 ‘solar factor’ based on eastern orientation in Std PHPP climate: = global radiation x HDD 84kHh plus various reduction factors.) g = SHGC
- 17. Wealth of USsolar insolation Hours of sun per day on an optimally tilted surface during the worst month of the year Source: National Renewable Energy Lab, www.nrel.gov/solar
- 18. New PH criteriafor US SHGC? ft312312.25Gross Enclosed Volume ft2796Gross Heated Building Footprint Area ft21448.5Treated Floor Area My project: 2.93.80.1130.61Werk Bucha archon N solar 304.350.1060.54Guardian Flachglas Climaguard N3 3.36.460.0880.30Low Solar Gain BTU/(ft2 hr)kBTU/(ft²yr)BTU/hr.ft2 .F%Name Heat LoadSSHDUcogSHGCGlass Type US Passive House standard SHGC may need to be increased from 0.5 to 0.6 because we can benefit from our extra sunshine.
- 19.
- 20. Conclusions • Tall, narrow,large windows for best performance and price • Optimize your installation for even better Psi-value • Use Solar Balance calculation for optimizing Commercial glazing systems • Look at benefit of higher SHGC for your projects • Remember ACTIVE SHADING.
- 21. Thank you! Presentation &Data: Bronwyn Barry Review & assistance: Guenter Pazen