For an array of rectangular straight fins. For the first answer, find the efficiency of a single fin. For the second answer, find the efficiency of the array of fins, with the given parameters: L = 10 mm t = 2 mm, w = 5 mm qt = 100 watts k = 200 w/mk Tinf = 20C Tbase = 100C Prime area: Ab = 25 mm2 h = 500 w/m2k Number of fins in array: N = 50

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window