What is the difference between a local convection heat transfer coefficient and an aver- age coefficient? what are their units? what is the difference between local and average convection coefficients for species transfer? what are their units? • what are the forms of newtons’ law of cooling for a heat ufl x and a heat rate? what are the analogous forms for convection mass transfer, expressed in molar and mass units?

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