Virtual Windows Anywhere - Energy Savings - Energy Saving Windows
Adding glass windows increases HVAC sizing dramatically.
Getting better glass windows helps but not as much as you might think.
Getting better glass windows helps but not as much as you might think.
The standard house has between 10%-20% wall window face area. The percentage increase is geographically agnostic, however the increase is multiplying by a larger number depending on the local extremes.
Getting better glass windows helps but not as much as you might think.
Getting better glass windows helps but not as much as you might think.
Getting better glass windows helps but not as much as you might think.
Here the difference is between aluminum double pane windows versus an energy saving window option such as vinyl double pane with bronze tint.
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Each 10% of wall area increases the loads ~100% of baseline!!
Virtual Windows can't replace all glass windows, they can replace between 50%-70% though. Considering the case of a house with 20% windows, if half of them are replaced with virtual windows, the gross cooling load reduction is 35% for cooling and 31% for heating. Factoring in heat energy created by running the virtual windows, the cooling reduction becomes closer to 20%. Factoring in the virtual windows energy consumption the reduction the savings are closer to 10%. On the other hand, exterior wall mounted virtual windows behave like baseboard heaters (when on) and the central heating reduction is mostly sustained. In case you wonder, the savings for replacing all the glass windows with better glass windows (maintaining 20% area) is closer to 15% for cooling and 10% for heating.
Imagine structures that have large window percentages
Security or toll booths have closer to 50% glass window area. Reducing the area down to just the access/service window could bring the value closer to 10%. This reduces the gross cooling demand by 68% and the heating by 61%!
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