Typical Calculations for the Design of an HT Furnace

Thermal conductivity = W m where W watts, m = meter, K = temperature in 

The quantity of heat flowing between two parallel planes of area at a distance x with temperature difference t — is given by  

Zone temperature Units °C Zone 1 1000 Zone 2 1200 Zone 3 1400 Total 

E = emissivity ratio for graphite (= 0.8) Ti = furnace temperature, K T2 = element temperature, K 

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