pv in glazed facades thermal indoor climate søren Østergaard jensen industry and energy...
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PV in glazed facadesThermal indoor climate
Søren Østergaard JensenIndustry and EnergyTeknologisk Institut
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PV in glazed facades
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First some theory
2 and 3 D heat losses
directly transmitted solar radiation
absorption
convection
long wave radiation
infiltrationconduction
reflection
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Simple theory
heat loss – U-value [W/m2K]
directly transmitted light and solar energy
indirectly transmitted solar energy
absorbedsolar energyreflected
solar energy
solar radiation
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transmittance for light – τ-value incoming solar energy – g-value heat loss – U-value
Parameters in the simple theory
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PV-cells have impact on the g-value PV-cells haven’t impact on the U-value the U-value has impact on the g-value
Parameters in the simple theory
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1 pane of clear glass 0.85 2 panes of clear glass 0.75 3 panes of clear glass 0.65 2 panes clear glass with low-e coating 0.60-0.65 Windows with solar screening 0.25-0.50
Examples of g-values
g-value
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The PV cells are mounted in the external pane of a low-e window with Argon between the two glass
Product opening g-value light trans- area mittance Würth WSS0007 8% 0.13 0.06 Würth WSS0008 21% 0.19 0.15 Würth WSS0009 22% 0.20 0.16 MSK / Suntech MST-44T101OU 10% 0.13 0.07 MSK / Suntech MST-50T051OU 4% 0.11 0.04 Interpane – reference panel 31% 0.23 0.22
U-value: 1.2 W/m2K
Windows with PV-cells
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The PV cells are mounted in the external pane of a traditional window with air between the two glass
Product opening g-value light trans- area mittance Würth WSS0007 8% 0.23 0.07 Würth WSS0008 21% 0.30 0.16 Würth WSS0009 22% 0.30 0.17 MSK / Suntech MST-44T101OU 10% 0.23 0.07 MSK / Suntech MST-50T051OU 4% 0.20 0.04 Interpane – reference panel 31% 0.34 0.23
U-value: 2.8 W/m2K
Windows with PV-cells
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Example: small office building
Heated floor area: 650 m2
Window area: 31 % of heated floor area
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Influence of the g-værdi
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cooling demand
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number of hours above 26 C
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Influence of the U-værdi
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cooling demand
heating demand
number of hours above 26 C
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Cold down fall
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U-valueWindow: 1,5 W/m²KWall: 0,2-0,4 W/m²K
”Cold down fall”
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Solar shading
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Solar shading
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g-valueNu 0.17Suncool 0.32Float 0.65
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PowerShades