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Paying to Warm Up Provo Nathan Hill Jon Marshall
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= Huge Gas Bills! Water Heater Gas stove/oven Gas Dryer -- Gas Heater!! --
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Windows are a huge source of energy loss Convection leaks Conduction K=1.4 Radiation Night – lose heat Day – gain heat
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Single Pane Windows are the Worst! Most students in Provo live in houses with windows more like this
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Example of Double-Pane Construction Double pane utilizes the lower convection coefficient of various gases between the panes. But they can be expensive.
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Picture of box hereAlternative Plastic Insulation Several Options at any hardware store This product is available at Home Depot
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Picture of us installing hereInstallation Installs with double sided tape Blow dry with hair dryer until taught Installed in 3 – 5 min
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window Is it worth it? We wanted to compare the heat flux between the single pane and the plastic insulated window We wanted to find out how much it really helps
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window L =.003175 m T o = 292 K T i = 295 K K = 1.4 Single Pane Analysis q” = 165.4 W/m2
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window L =.0254 m T i = 292 K plastic Plastic Insulation Analysis
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Picture of box here Here are the Numbers Typical Gas Heater efficiency ≈ 75%
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Picture of box here We want to know how much we can save! Energy Cost Natural Gas ≈ $10.00/Mbtu
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Picture of box hereAssumptions Heat radiation into and out of the windows is negligible Constant outside temperature throughout the month With plastic: outside surface window temp = inside surface temp
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