What size flat plate collector is needed to supply a family's water needs assuming 80 gallons per day are needed, change of T = 70 degrees F for the water, and that the collector-heat exchanger system has an average efficiency of 40 %. The collector tilt angle is equal to the latitude.
You need to also note the location, it takes twice as much collector to heat it in the north than in the south.
At Earth, the photograph voltaic's rays has an intensity of a million.4 kW/m^2. Now, because of the fact of certainty the photograph voltaic emits uncomplicated the two in all training, meaning a around shell with a radius reminiscent of the Earth's orbital distance around the photograph voltaic gets the comparable intensity in any know aspects. So, all you may do is multiply the intensity by skill of using the full floor part of that sphere to get your answer. significant themes to take exhilaration in: part of Sphere: 4*pi*radius^2 Distance from Earth to photograph voltaic: approximately one hundred and fifty million kilometers.
