Numerical Exercise 1. A flat plate is supplied with a constant heat flux of 100 [W/m2] from bottom. The plate has 0.5m2 area and is kept in a room with ambient temperature 20°C. If it has a steady state temperature of 32°C what is the heat transfer coefficient? Ta = 293[K] ģ = h(T, - Ta) %3D T, = 305[K] %3D q = 100 [W/m²] %3D Numerical Exercise 2. The air has the following properties at 27C: Density 1.18 [kg.m-3], Dynamic Viscosity i.85X105 [kg.m'.s'], Specific Heat capacity, Cp = 1.005 [kJ.kg'.K-]. If the thermal conductivity of air at that temperature is 1 = 0.026 [W.m-1.K), what is the average Nusselt Number over a flat plate of dimension 10 cm X 10 cm when air is flowing parallel to its surface with a speed 1 [ms ']? V = 1 [m/s] Re pCp Pr = Le = 0.1 [m] Nu = 0.664Režpr3

A freezer with dimensions of 4 m wide, 7 m long and 3 m high is under construction. The walls and ceiling are composed of 1.7 mm stainless steel (k = 15 W / [m ° C]), 10 cm thick foam insulation (k = 0.036 W / [m ° C]), a specific thickness of corkboard (k = 0.043 W / [m ° C]), and 1.27 cm thick wood (k = 0.104 W / [m ° C]). The inside of the freezer is maintained at -35 ° C. The ambient air outside the freezer is 32 ° C. The convective heat transfer coefficient is 5 W / (m K) on wooden walls and 2 W / (m² K) on stainless steel surfaces. If the outside air has a dew point of 29 ° C, calculate the thickness of the corkboard insulation that will prevent moisture condensation on the outer walls of the freezer. Calculate the heat transfer rate through the walls and ceiling of this freezer. Ignore heat transfer from floors and corners of buildings. a. Thickness of corkboard insulation = Answer cm. b. Heat transfer rate through walls and ceiling = Answer watts.