For seven collectors in series, each 1.2 m2 in area, FR1UL1 = 7.5 W/m2 -\deg C, and FR1(\tau \alpha )1 = 0.79 at a flow rate of 0.015 kg/s-m2 , estimate the useful energy collected if water is circulated through the collectors, the available solar radiation is 800 W/m2 , and the \Delta T (=Ti – Ta) is equal to 5\deg C.