2. A solar collector panel with a surface area of 32 ft² receives energy from the sun at a

rate of 150 BTU/hr per ft² of collector surface. Thirty-six percent of the incoming energy

is lost to the surroundings. The remainder is used to heat liquid water from 110 to

140°F. The water passes through the solar collector with a negligible pressure drop.

Neglecting kinetic and potential energy effects, determine (at steady state) the mass

flow rate of water, in lb/min. How many gallons of water at 140°F can eight collectors

provide in a 30 minutes?