Potential For Electronic Glass For Commercial Buildings [Keith Murray]
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This document discusses switchable variable-tint electrochromic windows that can be installed in commercial building facades. It notes that windows are a major source of heat loss from buildings. Electrochromic windows allow occupants to control their comfort levels by adjusting the tint of the windows. Installing these windows on the three main facades of a hypothetical commercial building could save up to £17,000 per year in London and £7,000 per year in Glasgow by reducing energy costs. However, the current high cost of around £450 per square meter means electrochromic glass would need to fall below £250 per square meter to be financially attractive compared to standard low-e glass.
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Potential For Electronic Glass For Commercial Buildings [Keith Murray]
- 1. Switchable variable-tint electro-Switchable variable-tint electro- chromic (EC) windows in achromic (EC) windows in a commercial building façade atcommercial building façade at UK latitudesUK latitudes Greenspace Research, LewsGreenspace Research, Lews Castle College UHI, StornowayCastle College UHI, Stornoway Keith MurrayKeith Murray
- 2. Windows are theWindows are the weakest part of theweakest part of the building envelope forbuilding envelope for heat lossesheat losses Windows of theWindows of the Future?Future?
- 3. Solar Heat GainSolar Heat Gain
- 4. Internal wallInternal wall surfacessurfaces Low e-coating on the outer surface of the innerLow e-coating on the outer surface of the inner pane of double glazingpane of double glazing Inner glass Inner glasspanepane Outer glass pane Outer glass pane Air GapAir Gap e-coatinge-coating Solar Short Wave RadiationSolar Short Wave Radiation D. GlazingD. Glazing Long waveLong wave RadiationRadiation
- 6. Changing commercialChanging commercial building façadebuilding façade Post 2000Post 2000
- 7. Photochromic lensesPhotochromic lenses Light sensitiveLight sensitive glassglass
- 8. Future Generation: Electro-chromicFuture Generation: Electro-chromic windowswindows
- 9. Occupants control theirOccupants control their comfortcomfort
- 11. Building ±Building ± 4545ºº orientationorientation SE façadeSE façade SW façadeSW façade Hypothetical CommercialHypothetical Commercial Building modelBuilding model
- 12. For ec, dark- v- low-eFor ec, dark- v- low-e
- 13. Urban Heat IslandUrban Heat Island EffectsEffects (UHI)(UHI) For Central London, +32%For Central London, +32% working hours (900-1800)working hours (900-1800) +25+25ººCC For Central Glasgow, (900-For Central Glasgow, (900- 1800)1800) Summer months May-Summer months May- SeptemberSeptember
- 14. Potential savingsPotential savings electrical charge of 12p/kW-helectrical charge of 12p/kW-h EC glazing on the three cardinalEC glazing on the three cardinal façade (E;S;W)façade (E;S;W) Saving in London~£17,000/aSaving in London~£17,000/a Saving £7,000/a in Glasgow.Saving £7,000/a in Glasgow.
- 15. Current cost of EC glassCurrent cost of EC glass ~£450/m²~£450/m² Would be financiallyWould be financially “attractive” if ec glass <“attractive” if ec glass < £250/m²£250/m² Low-e cost ~£350/m² in 70’sLow-e cost ~£350/m² in 70’s →→ byby Cost Implications ReplacingCost Implications Replacing low–e with Electro chromiclow–e with Electro chromic glass?glass?
- 16. Call me obtuse, but youCall me obtuse, but you could stand me on acould stand me on a beach till the end ofbeach till the end of time and never would ittime and never would it occur to me to try tooccur to me to try to make it into windows.”make it into windows.”