Estimate the top heat loss coefficient of a collector that has the following specifications: Collector area = 2 m2 (1m x 2 m). Collector slope = 35. Number of glass covers = 2. Thickness of each glass cover = 4 mm. Thickness of absorbing plate = 0.5 mm. Space between glass covers = 20 mm. Space between inner glass cover and absorber = 40 mm. Mean absorber temperature, Tp = 80C = 353 K. Ambient air temperature = 15C = 288 K. Absorber plate emissivity, p = 0.10. Glass emissivity, g = 0.88