A flat-plate water heating collector absorber plate is copper 1.00 mm thick. Tubes 10 mm in diameter are spaced 160 mm apart. The collector overall loss coefficient is 3.0 W/m2 ◦ C and the inside heat transfer coefficient is 300 W/m2 ◦C. The solder bond between the plate and tubes is 5 mm wide and averages 2 mm thick. The solder has a conductivity of 20 W/m ◦C. What is F for the collector?