An oven may be regarded as a cube,each side 1.2m long. The oven stands on thin legs and the heattransfer through each of the six faces is identical. The walls anddoors are all made of a stainless steel lining (thermalconductivity 20W/mK) 2mm thick, a layer 75mm thick of insulatingmaterial (thermal conductivity 0.25W/mK) and a mild steel outersheet (thermal conductivity 48.5W/mK) 3mm thick. If the inner walltemperature is 400oC and the outer surface temperatureis 100oC calculate the rate of heat loss from the oven.Estimate the heat transfer coefficient between the oven and thesurrounding air at 30oC
[8.63kW, 14.3W/m2K]
