The inner temperature of a muffle furnace is 500C (h=20 W/m2K). The furnace shape is cubic...

 

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The inner temperature of a muffle furnace is 500°C (h=20 W/m2K). The furnace shape is cubic and the walls are made of a sandwich of materials. The firs layer (from inside to outside) is made of refractory brick (X=1.2 W/mK, t=64mm), thern there is an insulanting material (X=0.2 W/mK) and then a cladding stainless steel plate (X=15 W/mK, s=5mm). The total lateral surface of the furnace is 9m2. The environment temperature is 25°C (h=5 W/m2K). The temperature of the external wall of the furnace must not exceed 60 °C, calculate the thickness of insulation to be used. less The inner temperature of a muffle furnace is 500°C (h=20 W/m2K). The furnace shape is cubic and the walls are made of a sandwich of materials. The firs layer (from inside to outside) is made of refractory brick (X=1.2 W/mK, t=64mm), thern there is an insulanting material (X=0.2 W/mK) and then a cladding stainless steel plate (X=15 W/mK, s=5mm). The total lateral surface of the furnace is 9m2. The environment temperature is 25°C (h=5 W/m2K). The temperature of the external wall of the furnace must not exceed 60 °C, calculate the thickness of insulation to be used. less

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