4-29 Consider a flat-plate collector with the following specifications: Collector area A = 3.0 m Incident radiation G = 880 W/m. Heat loss coefficient U = 3.3 W/m2.C Convection heat transfer coefficient at the inner surface of the tubes h; = 250 W/m.C Tube spacing W= 18 cm Outer tube diameter Do = 1.50 cm Inner tube diameter D; = 1.35 cm Fin efficiency fin = 0.93 Contact resistance between the plate and the tube is negligible. Flow rate of water in the tubes m = 0.030 kg/s w Water inlet temperature Twin = 50C Ambient air temperature T = 15C The product of transmissivity of glazing and absorptivity of the absorber t = 0.80 (a) Calculate the collector efficiency factor and the collector heat removal factor. (b) Calculate the rate of useful heat gain, the temperature rise of water through the collector, and the collector efficiency.