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12-1. You have recorded air temperatures (C) for one week and have calculated the following average air temperatures for the week: Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7 8 12 10 16 18 21 4 Calculate the number of heating .C-days contributed by this week to the yearly total for temperature base 18 and temperature base 12. borfor ADJ12-4. You are considering adding a Trombe wall solar window to your home. Architectural considerations suggest three possibilities for the window area, 80, 150, and 200 ft2 will fit the current south-facing wall. Construction cost increments of the three possibilities are $850, $1200, and $1500, respectively. The heat loss factor (F,, I-P units) of the house has been calculated as 275 BTU h- F-1 and the wall into which the solar window can go has an R-value of 20 (I-P units). Your local (adjusted) heating F-day value is 5000 and your conventional heating energy is expected to cost $42 MBTU-1. If the installation cost is amortized at 10% yearly, which is the most economically beneficial window area if the Trombe wall system you are considering is represented by the following SSF:LCR data? SSF 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 LCR 135 64 32 20 13 9 5 212-9. Start other city of your choice). By what per 50 OF ? 12-10. The city of Athens, Greece, is at approximately 38 north latitude. You are to design a solar overhang for a south-facing window that is 120 cm high in this location. The first day after the spring equinox when the overhang should block the sun entirely at solar noon is April 20, and the first day after the fall equinox when it should entirely admit the sun at solar noon is October 21. (a) How far out horizontally should the solar overhang reach (distance O) and how high vertically above the top of the window should the overhang sit (distance h), in centimeters? ouse at 42 north latitude is 54" tall and has a solar overhang What is the first day