
296 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
5.13 Derive an equation for the lines of constant declination in a sun-path diagram, for
example, Figure 5.10d. Check your equation by plotting a few declination lines on a
piece of polar coordinate graph paper.
5.14 Derive Equation 5.33 relating prole angle γ to azimuth angle α and altitude angle α.
5.15 Based on Equation 5.46, what value of β would result in the annual minimum value of the
incidence angle i? Note that this tilt angle would result in maximum collection of beam
radiation on a xed, at, south-facing surface. Hint: Use a double integration procedure. ...