UV Damage Weighted Transmittance (Tdw) is the weighted average for wavelengths 300 – 780 nm (based on CIE 89/3). The UV Transmittance is determined as an average for wavelengths 300 -380 nm. The lower the number, the better the glazing is at preventing solar gain. The amount of solar radiation that enters a building as heat. (See and for more information on glass optical data and the Window 7.4 program.) Emittance of ordinary (pyrolitic) low-E is 0.16. House heat/cool energy simulations used the Resfen program from Lawrence Berkeley National Lab ( ).Īll values calculated using Window 7.4.
Cardinal chains lvl 74 windows#
The existing double-pane windows used heat/cool thermostat setpoints of 72☏/74☏ to match the comfort of LoĒ²-270 glass at 70☏/78☏. “Equal Comfort” thermostat settings determined using window thermal comfort research from the University of California at Berkeley ( ). “Fixed Thermostat” conditions are 70☏ for heating and 75☏ for cooling. Interior shading devices are presumed to be closed 50% of the time throughout the year. Window orientation set as uniformly distributed on all sides to represent a neighborhood average and the total window area set to 15% of the floor area. “Average” house as described in the Buildings Data Book at The model house is described as a mid-1970’s single-story dwelling with natural gas furnace, central air-conditioning, adequate insulation, and double-pane windows. Savings values are average of multiple locations within climate zone. Heat/Cool portion of your energy bill:DOE estimates that in 2005 the average house spent $2,003 on utilities and that 43% of this total ($886) is for heating and cooling energy.
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