Examining Window Retrofit Options


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Storm windows, insulating shades, sash replacements, awnings - The good news is that we have so many ways to improve the performance of our windows. The bad news is...there are so many ways to improve the performance of our windows! How in the world can we objectively compare them on price, thermal performance, ease of installation, ease of use, solar control, privacy, and durability?

Lawrence Berkeley National Laboratories and BuildingGreen are working on simple and easy-to-use resources for selecting window retrofit options. With input on climate, existing window attributes, and performance priorities, anyone can cut through the difficulties of deciding how to improve the overall performance of existing windows.

Using resources from www.windowattachments.org, webinar participants will work through window attachment selection scenarios with the instructor and learn how to use these resources with their clients and on their own projects.

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Examining Window Retrofit Options

  1. 1. Examining Window Retrofit Options Peter Yost BuildingGreen March 2, 2012 What Should I Do About My Windows?
  2. 2. The Energy Center of Wisconsin is a Registered Provider with TheAmerican Institute of Architects Continuing Education Systems. Creditearned on completion of this program will be reported to CES Recordsfor AIA members. Certificates of Completion for non-AIA membersavailable on request.This program is registered with the AIA/CES for continuingprofessional education. As such, it does not include content thatmay be deemed or construed to be an approval or endorsement bythe AIA of any material of construction or any method or manner ofhandling, using, distributing, or dealing in any material or product.Questions related to specific materials, methods, and services willbe addressed at the conclusion of this presentation. Thank you!
  3. 3. Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction,distribution, display and use of the presentation without written permission of the speaker is prohibited. © BuildingGreen, LLC 2012
  4. 4. Learning ObjectivesUpon completing this course, participants will be able to:  Understand the full range of window retrofit options.  Understand the full range of attributes the options can address.  Rationally compare options and attributes of window retrofit strategies.  Select the most appropriate window retrofit options based on the full range of options and attributes.
  5. 5. What to do about my windows?Options Attributes
  6. 6. Options Interior Exterior Replace  Blinds   Storms   Full unit  Drapes   Shutters   Insert  Roller shades   Awnings   Sash replacement  Fixed panel   Roller shades   Repair/  Quilt   Screens ”upgrade”  Cellular shades   Landscaping  Films
  7. 7. Attributes Thermal Visual Use  Insulation   Visual   Ease of transmittance operation  Air tightness   View   Adjustability  Solar heat gain   Daylighting   Ease of  Comfort cleaning/repair   Glare  Condensation   Maintenance/ resistance   Privacy durability   aesthetics
  8. 8. Attributes (cont’d) Economics Other  Materials/equipment costs   Ease of install  Installation costs   Availability  Heating/cooling savings   Acoustics (noise reduction)  Service life (attachment)   Role in ventilation  Service life (window)   Security
  9. 9. NFRC - Attachments  Applied Films (label)  Awnings  Exterior Attachments  Interior Attachments  Storms (next?)
  10. 10. The LBNL Project  Advisory Committee – mix of private industry representatives, expert consultants, LBNL research staff  Literature Review – “gray” and “white” information resources  Field Testing – Comparative IR imaging under standard conditions & supported by additional metrics  Guidance Tools – DOE fact sheets and web-based tool (decision process, including modeling/ calculators)
  11. 11. Advisory Committee  John Gant – Glen Raven   Tom Culp (storms) (awnings)   John Carmody & Kerry  Mike Cienian – Hunter Haglund (CSBR) Douglas (cellular shades)   Nils Petermann (ASE)  Steve DeBusk – CP Films (surface-applied films)   LBNL Steve Selkowitz  Andrew Caldwell (Phifer) Charlie Curcija Dariush Arasteh Christian Kohler Robert Hart Howdy Goudey
  12. 12. LBNL Literature Review  Early stages – laboratory testing, field testing, modeling—it’s pretty early in the game all around (beta WINDOW7)  Research mosaic – different countries, test methods, base cases, options – it’s a jungle out there.  Results alignment – surprisingly good - e.g. Energy Plus and ESP-r  Terminology & classification – it’s a jungle out there (two jungles – science community and general public)  Quality of manufacturer-posted info – it’s a jungle out there  Window/attachment interactions – good and bad?
  13. 13. Field Testing  Obtain visually-compelling, comparative, thermal- performance portrayals of residential windows with and without the benefit of window retrofits.  Achieve this with the combination of thermocouple and heat flux sensors, IR and digital camera images.  Develop above into a protocol or standardized test (for both wintertime and summertime conditions).
  14. 14. Field Test Site
  15. 15. Field Test Site
  16. 16. Field Test Window (winter)
  17. 17. Test Team
  18. 18. Test Setup (winter) Equipment credit: Nathan Yost
  19. 19. What the Window “Sees”
  20. 20. What the Window “Sees”
  21. 21. Double-pane low-e,no attachment, -20 Pa
  22. 22. Interior Storm Panel – single-pane
  23. 23. Insulated cellular shade (ST), double-pane low-e
  24. 24. Window quilt,low-e double pane
  25. 25. Single-pane, no attachment
  26. 26. storm double storm triple IGU doubleinterior low-e storm over Interior low-e storm over “base case” dual “vintage” single-pane “base case” double low- glazed low-e Ar doublewood frame double hung e Ar sash inserts hung sash inserts
  27. 27. storm double storm triple IGU double + insulating shade room side low-e Room facing low-e film on Interior low-e storm over Honeycomb shade with side single wood framed double “base case” double low- tracks over “base case” doublehung with exterior clear storm e Ar sash inserts low-e Ar double hung sash inserts and ΔP
  28. 28. Interior Low-e Storm Over “Vintage” Single-pane Wood Framed Double Hung With Varied Pressure Difference No ΔP 10 Pa ΔP 16 Pa ΔP
  29. 29. Interior screen (Inflector) radiant side in (winter)
  30. 30. Test Setup(summer south - inside)
  31. 31. Test Setup(summer - inside)
  32. 32. Test Setup(summer south - outside)
  33. 33. Interior solar screens - south
  34. 34. Exterior solar screens - south
  35. 35. Phifer Perf+ Inflector Suntex 80 Suntex 9090+F room surface 100+F room surface 80+F room surface 80+F room surfaceIR0057 8/12 11:36 IR0056 8/12 11:12 IR0060 8/12 12:21 IR0061 8/12 12:32Tin: 71.8F Tin: 71.7F Tin: 71.6F Tin: 71.2FTout: 85.8F Tout: 81.1F Tout: 83.4F Tout: 85.4FTfacade: 92.5F Tfacade: 82.0F Tfacade: 92.4F Tfacade: 91.7FTC2: 91.1F (glass) TC2: 94.1F (glass) TC2: 81.2F (glass) TC2: 83.3F (glass)Solar pyro ratio: 0.02 Solar pyro ratio: 0.14 Solar pyro ratio: 0.10 Solar pyro ratio: 0.01Photometric ratio: 0.03 Photometric ratio: 0.15 Photometric ratio: 0.09 Photometric ratio: 0.00South LH South RH South LH South RH – Suntex 90 Single Clear Control Single Clear Control Tin: 71.3F Tin: 71.7F Tout: 75.2F Tout: 84.1F Tfacade: 85.5F Tfacade: 94.6F TC1: 82.5F TC1: 82.4F Solar pyro ratio: 0.83 Solar pyro ratio: 0.80 Photometric ratio: 0.86 Photometric ratio: 0.84 South Mid. South Mid.
  36. 36. IR2346 8/4 13:19:17 IR2347 8/4 13:20:00 IR2348 8/4 13:33:14Tin: 25.7C Tin: 25.4C Tin: 25.2CTout: 32.2C Tout: 31.5C Tout: 34.0CSolar pyro ratio: 0.11 Solar pyro ratio: 0.62 Solar pyro ratio: 0.19Photometric ratio: 0.08 Photometric ratio: 0.66 Photometric ratio: 0.13South LH South Center South RHLow Solar Gain exterior Single clear control High solar gain exteriorstorm storm
  37. 37. IR2387 - 8/6 11:03:42 Tout=28.9C Tin=25.2C, ~250W/m^2
  38. 38. Test Setup(summer west - outside)
  39. 39. Test Setup(summer west - inside)
  40. 40. IR2372 8/5 3:21:50 IR2373 8/5 3:23:25 IR2378 8/5 4:08:39Tin: 26.5C Tin: 26.5C Tin: 26.7CTout: 34.0C Tout: 34.1C Tout: 31.6CTwest: 36.3C Twest: 35.9C Twest: 38.2CTC2: 30.1C (29.8C IRcam) TC1: 33.7C (32.4C IRcam) TC2: 49.8 (glass under shade)Tedge: 28.3C Tedge: 42.8C Tedge: 55C (on frame under shade)Solar pyro ratio: 0.22 Solar pyro ratio: 0.86 Solar pyro ratio: 0 blackout but noPhotometric ratio: 0.16 Photometric ratio: 0.93 meas.West RH – awning arm near 90 degrees West LH – awning retracted (control) Photometric ratio: 0 blackout but no(full shading) meas. Can make out shadow of retracted awing valence on top glass West RH – insulated cellular with side Reflection of person at right edge of glass tracks Horizontal bands are shadow of storm frame Can make out shadow of retracted awing valence center divide (lower) and window meeting rail on top sash (upper). Storm panels were removed. Warm spot below TC tape is left over from previous presence of light sensors next to glass.
  41. 41. Unshaded control Interior glass/ Insulated cellular (single clear) frame window shade with side surface tracksRetracted valence covers temperatures just most of uppoer sash after being covered Retracted valence covers most of upper sash with side track ICS Retracted valence covers most of uppoer sash
  42. 42. Interactions we don’t want: low-e storms (WINDOW6, NFRC summer conditions) Base cases – double ext low-e storm over pane units, no storm double pane unit  clear; no storm:   93 F   clear; no storm:   101 F  Hard coat low-e (#3):  99 F   Hard coat low-e (#3):  111 F  Spectrally selective low-e,   Spectrally selective low-e, high high VT  (LoE3-366 on #2):   VT (LoE3-366): 156 F 106 F    Spectrally selective low-e,   Spectrally selective low-e, lower VT  (LoE2-240 on lower VT (LoE2-240): 185 F #2):  117 F     Gray tint: 141 F  Gray tint:  109 F
  43. 43. Interactions we don’t want (WINDOW6, NFRC summer conditions) int low-e storm over double pane unit Conclusions  clear; no storm:   106 F   Exterior low-e storms likely to be a problem with:  Hard coat low-e (#3):  133 F   IGU + spectrally-selective  Spectrally selective low-e, low-e high VT  (LoE3-366 on #2):     IGU + dark tint 108 F     IGU + Low-e surface 3  Spectrally selective low-e,   Interior low-e storms likely lower VT  (LoE2-240 on #2):   to be a problem with: 120 F     IGU + Low-e surface 3  Gray tint:  115 F
  44. 44. East –low-e IGU w/ low-e storm
  45. 45. West -low-e IGU w/ low-e storm
  46. 46. Resources  Website (downloadable fact sheets, then web tool) – www.windowattachments.org  EBN feature article (June, 2011)  Blogs
  47. 47. The R-value of a Vermont Cat
  48. 48. BuildingGreen, Inc.•  Founded in 1985•  Based in Brattleboro, Vermont•  20 employees•  Supported by subscriptions, book sales, online memberships•  Does not carry advertising BuildingGreen offices in old Estey Organ Factory, Brattleboro www.windowattachments.org
  49. 49. Thank YouThis concludes The American Institute of Architects Continuing Education Systems Program Peter Yost peter@buildinggreen.com