You have been asked to calculate some performance characteristics of a new solar collector on the market. You have some of the details for it as shown below. a) b) c) Compute the effective transmittance absorptance product ( ra, ) from normal to 80 incident radiation for a flat plate collector with the following characteristics Cover : low iron glass 0.005 m thick, extinction coefficient (K) = 3.0 m-! Note: You need to estimate the diffuse reflectance based on the lecture notes Absorber Plate : short wavelength absorptance = (.92 (no angular dependence). Calculate the incident angle modifier, Kz, using equation OE9 Given the overall heat loss coefficient has been calculated to be 10W/m?K, graph the efficiency curves (1 vs AT/G) for angles of incidence of zero and 80. - K. = 1-b COs O Eq OE9 For a collector with a flat glass cover b = 0.1