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We performed a total of about 100 simulations, estimating energy use anderson for the six test case residences modeled with the current windows and with each of five replacement options. Thirty windows McLean Gardens residents replacement responded to our request for a waiver to access utility records, and we checked parts our simulation results for the existing-windows case anderson against these bills, tweaking some of windows our assumptions replacement as a result. We also parts did some basic sensitivity runs anderson to evaluate the effect of orientation and shading.The results brought some surprises (see Figure 3 for typical results for one apartment type). windows The first is the large projected heating savings for the storms-only replacement, an option with a replacement far lower cost than full window replacement. This results from the combined parts effects of reduced infiltration and the estimated reduction in U-value attributable to a tighter system.

To do this, we selected CONTAM, a program anderson and windows developed by the National Institute for Standards and Technology and available flee through its Web site (see information at the end of this replacement article). CONTAM calculates instantaneous values of air flow through openings in buildings, using the flow characteristics of each opening, orientation, height, and other factors, based on a weather file that provides temperature and wind information. We set up our CONTAM runs to calculate air flow for each hour parts of the typical anderson year, and then summarized the results by month.To complete the windows energy simulation inputs, we gathered information on building envelope construction replacement and estimated appliance loads, hot water usage, and occupancy for each unit type. Water-to-air heat pumps installed in each unit provide parts heating and anderson cooling at McLean Gardens. windows Six central plants equipped with boilers and cooling towers provide conditioned water at roughly 70[degrees]F to the heat pumps as a source or sink for energy. We replacement took advantage parts of Visual DOE''s ability to model this system anderson and windows and replacement by grouping an upper, middle, and parts lower unit together with a central plant for each analysis.