Question

Midterm Question (5) A home with 2,000 ft2 of ceiling and waiï area with no insuïation in Alaska (12 month heating season) has an average outdoor daily temperature of 50°F. The homeowner would їǐke to keep the house set to a comfortabïe 69°F аїї day. Contractor has offered 2 estimates: 1) to add R15 insulation for $2 per sqft-or- 2) to add a radiant barrier/insulation combination with a R40 rating for $4.00 per sqft. The house is heated with electricity that costs 17.6 cents/kWhr. (a) Calculate the heat loss rates for both options (b) Calculate the energy saved for both options (c) Calculate the annual savings in dollars for both options (d) If another Contractor offers a third option which provides an R35 rating for $4.25 per sqft and only requiring 11 months of heating. Which of the three options is the most cost effective?

Answer 1

^riytn thoi 2186-05mm (50-32) C69-32) 2431s W

メAnga. 823 3.6x LO6 2 6513 kh cae@) 0(7 8爭2.3x365 x 2YKJGo 二 3-6x lo 24 G1 Rwh. 10o CaxT Intallation doy. Q声 2000 100 ニ 8000声

d) Tn thdd ophon 8 6 3 Heat 109 e 10-55-x18625 6 161 2 318 33W . Change 318.53 χ11 x30 x 24 x 3600 B5ооф