One way to decrease your use of fossil fuels is to heat your
water via solar radiation. A solar water heater runs cold water
through dark, radiation absorbing tubing. Systems can be as
simple as using black PVC pipe on your roof. Assume one such
system absorbs at a 45% efficiency in a location where average
solar-energy hitting the solar panels is 210 W/m^2. The water
begins at a temperature of 16.0 °C and needs to be heated to
61.0 °C. If the area of the solar panels is 32.0 m^2, what
volume of water can be heated in one hour?