R = 018 Windows in a House Are Replaced with R =

question 3

Essay

R = 0.18 windows in a house are replaced with R = 0.52 windows at a cost of $\$ 250$ per $\mathrm { m } ^ { 2 }$ . Assume that the outside temperature is a constant $5 ^ { \circ } \mathrm { C } [$ a reasonable approximation for a region corresponding to about 4300 degree days per year $\left( { } ^ { \circ } \mathrm { C } \right)$ ] and that heat costs $\$ 0.03$ per MJ. How long will it take to recover the cost of the window replacement? (Do not include the cost recovery factor.)

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