|
|
The cooling results brought another surprise in projecting only tiny energy savings for windows the storm windows or non-low-e replacement windows. This occurs because reduced conduction and reduced air leakage, according to the simulation and weather file used, don''t save energy during the cooling season. That is, energy gained by conduction and leakage during hot days is balanced by energy removed during cool evenings in the Washington, D.C., climate. Note the implicit assumption that residents keep their windows closed and air conditioners operating even on cool evenings. We didn''t have any quantitative basis for altering this assumption. The window replacement options with low-e glass, on the other replacement hand, show significant projected cooling savings, largely as a result of reduced solar Calculated as energy savings/[ft.sup.2] of window sash area, typical savings for the highest-performance window windows option are about 0.50 MMBtu/[ft.sup.2] per year in heating and 0.45 MMBtu/[ft.sup.2] per year in cooling. This replacement kit makes replacing old, energy wasting windows, fast and simple. Each kit comes complete with two sash, two vinyl compression balances, one vinyl parting stop, two vinyl sash stops, and all necessary installation hardware. Sash are available primed for painting or aluminum clad in assorted colors. Vinyl casement and awning windows now feature Truth Maxim commercial-grade hardware to make them easier to operate, says the firm. All casement and awning windows come standard with fold-down handles to provide extra room for replacement drape and blind clearance around windows. The firm manufactures numerous other products. 724-465-1800. www.gorell.com, Circle 195. Fusion-welded vinyl windows are perfect for new or remodeling applications because they resist water, corrosion, and mold, claims the firm. Available in white and almond, they feature removable nailing fins. Muntins are optional. The company also manufactures aluminum-clad and wood windows as well as windows patio doors. 800-877-9482. www.summit windows.com. Circle 184. Kolbe & Kolbe Millwork offers vinyl windows. The Wausau, Wis.based, high-end wood window manufacturer will supply a wide selection of vinyl window designs - radius, bow, bay and geometric - through its new KVW Windows & Doors division. The new line includes double hung models, sliders, casements, awnings and sliding doors. A new production plant, located in Manawa, Wis., was scheduled to begin operating in February. ProFinish vinyl windows come in double-hung, single-hung, casement, slider, picture, replacement and geometric-shaped styles. The windows, which won''t pit, peel, or chalk, claims the maker, feature welded frames and sashes and integral J-channels. Numerous glass options and grids are available. 800-542-9118. www.simonton.com. Circle 182. Monument vinyl windows come in white and almond and feature fusion-welded mitered corners and multiple hollow chambers for strength, says the firm. The windows come in casement, awning, double-hung, single-hung, and sliding styles. A number of glazing and glass options are available. 800-223-4873, www.hurd.com. Visions 2000 vinyl windows are maintenance-free and won''t rust or corrode, says the firm. The windows are available in single-hung, double-hung, casement, and awning styles. windows The line comes standard with integral nailing fins and fusion-welded corners. Optional grilles and glazes also are available. Comfort. Window replacement at McLean Gardens would result in reduced window air leakage and increased wintertime temperatures at the inner glass surface. Reduced air leakage means fewer drafts near windows. Increased wintertime glass temperature would reduce cold convection currents that spill off windows, further reducing the sensation of drafts. The temperature increase would also increase the average radiant temperature of the indoor environment. (Average radiant temperature has nearly as strong an influence on comfort as does air temperature.) replacement While all the replacement options would yield some increase in windows temperature, the higher-performance low-e, argon-filled replacement glass would offer the greatest increase. While improved comfort has value in itself, it may also result in thermostat adjustments that yield additional real energy savings.
|