dc district of columbia replacement windows

The test results quantified leakage dc district of columbia replacement windows that residents have long known about from experience. measured leakage interpolated to a district pressure difference of 75 pa, ranged from of 9 to 96 cfm. the columbia median value for the most common window size was 44.1 cfm at 75 pa, replacement or 2.42 cfm per linear ft of perimeter crack (see figure 1). calculated at a pressure difference of 50 pa, the median leakage value is 35.6 cfm, and at 4 pa, 9.3 cfm. (one standard pressure difference used in window testing is 75 pa; 50 pa is common in building studies; and 4 pa is used to approximate average operating conditions.)

ile windows the rest were replaced during condo conversion in about 1981 with new single-glazed sash in dc aluminum jamb liners. nearly all the windows of both types are fitted with operable exterior aluminum storms with screens.our district planned of and columbia approach to estimating energy use before and after replacement window replacement was straightforward. we would get windows manufacturers specs and/or standard reference values dc for the conductive, district and of and columbia solar transmission, and air replacement leakage characteristics of old and new windows; then use windows energy simulation software to crunch the numbers for several dc typical residential district and of and columbia units; and replacement extrapolate the results across the entire community. windows the key dc question was how district much effort to allocate to each step to get of the best results.

figure 1 omittedenergy columbia and replacement calculationsworking with mike steiner, we selected several window options to be considered in our analysis. heating and cooling are windows both significant energy dc loads in the washington, district d.c., climate, of so low-conductivity glass and glass with reduced solar columbia and replacement transmission were windows considered. dc as well as outright replacement of the prime windows, we evaluated replacement storm windows as an district option expected of to yield some energy savings and to resolve some maintenance problems. columbia and replacement and windows the options we evaluated were:

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