A wall of area 2m is made of 10 mm inner decorative panel (k = 0.8 W/mC) and 100

Question

A wall of area 2m is made of 10 mm inner decorative panel (k = 0.8 W/mC) and 100 mm outer brick layer (k = 2.0 W/mC) as shown in sketch below. On a winter day. the room air temperature is maintained at 20 C external air temperature was -10 C, the convective heat transfer coefficient is 25 W/m2K on the inside and 200 W/m2K on the outside. Neglect radiation. Box your answers when you can. Draw the thermal resistance circuit showing all thermal resistors between the inner and outer temperature (don't substitute numbers yet). Write an equation for total thermal resistance (don't substitute numbers yet). Calculate the total thermal resistance. Do not forget units. Cakulate the heat transfer rate, Q. through the wall in kW. Calculate the external wall surface temperature (Tw).

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