FIGURE12.4 Table 12.9 plotted using the spreadsheet trend line.
As can be seen, the optimum solution occurs at about a collector area of 30m2 and F = 0.39. For this size, the total cost of the solar energy system is obtained from Eq. (12.2) as
cs, = 210 x 30 + 1150 = $7,450
The life cycle savings are obtained from Eq. (12. 31)as
LCS = P1CF1FL - P2Cs = 20.242 x 8.34 x 161 X 0.39 - 1.1316 X 7,450
= $2,170