An approach to optimization of double slope solar still geometry for maximum collected solar energy

This investigation represents the optimum inclination angles of the glass cover of the double slope solar still, and orientation for maximum collected solar energy that could be captured by the solar still glass cover. The results will be displayed for different latitudes (phi = 24 degrees, phi = 27.2 degrees, phi = 30 degrees and phi = 31.2 degrees) to cover Egypt geographically. The double slope solar still has two opposite inclined surface; so it has two surfaces azimuth angles (gamma(1) and gamma(2)) according to vertical bar gamma(1)vertical bar + vertical bar gamma(2)vertical bar= 180 degrees, with opposite signs, these values are (gamma(1) = 0 degrees and gamma(2) = 180 degrees), (gamma(1) = 90 degrees and gamma(2) = -90 degrees), (gamma(1) = 45 degrees and gamma(2) = -135 degrees) which is equivalent to (gamma(1) = 45 degrees and gamma(2)= 135 degrees); consequently, the total energy is the summation of the collected energy by the two surfaces represents the double slope solar still surface area. The inclination angle (beta) is changed from 10 degrees to 60 degrees on both sides of the glass cover to get independently the optimum inclination angles for each side that not necessary to be the same. (C) 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V.