Electric Heating Design





Calculation for Static Medium



Calculation for Static Medium



 


Calculation for Static Medium






















 



P : Total heating power (KW) 

P1 : Power required for medium temperature rise (KW) 

P2 : Power required for container temperature rise (KW) 

P3 : Heat loss from container surface (compensation power KW) 

M1 : Medium weight (kg) 

C1 : Specific heat of medium (kcal/kg℃) 

m2 : Container weight (kg) 

c2 : Specific heat of container (kcal/kg℃) 

Δ t : Temperature rise (℃) = Final temperature - Initial temperature 

h : Heating time (h) 

λ : Thermal conductivity of insulation material (w/mk) 

S : Container heat dissipation area (m2) 

δ : Thickness of insulation material (m) 

m3 : Additional medium weight or flow rate per hour




Calculation for Flowing Medium




c3 : Specific heat of medium (kcal/kg℃)






 


Properties of Common Materials























































































Name




Density μ g/cm3




Specific Heat C KCal/Kg·℃




Name




Density μ g/cm3




Specific Heat C KCal/Kg·℃




Acetic Acid




1.049




0.52




Air




0.00129




0.24




Ethanol




0.785




0.58




Carbon Dioxide




0.00198




0.20




Methanol




0.786




0.61




Ammonia




0.00077




0.52




Petroleum




0.82




0.511




Hydrogen Chloride




0.00164




0.20




Glycerol




1.259




0.63




Hydrogen




0.00009




3.409




Kerosene




0.82




0.5




Nitrogen




0.00117




0.244




Thermal Oil




0.88




0.47




Natural Gas




0.0007




0.593




Engine Oil




0.929




0.40




Asphalt




1.1




0.40




Benzene




0.88




0.34




Beeswax




1.1




0.40