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                The document of electric heating
                


                
Computation Unit
                

                


                


                
1.Wattage：W、kW
1kW=3.412BTU/hr
                　     =1.36(HP)
                　     =864Kcal/hr
                

                
2.Weight：kg 
1kg=2.204621b
                

                
3.Flow rate：m/min
 
                

                
4.Flux：m3/min、kg/h
 
                

                
5.Specific heat：Kcal/(kg℃)
1kcal/(kg℃)=1BTU/hr.oF
                                   =4186.8J/(Kg℃)
                

                
6.Wattage density：W/cm2
1W/c㎡=6.4516 W/in2
                

                
7.Pressure：MPa
 
                

                
8.Heat conductivity：W/(m℃)
1 W/(m℃)=0.01J/(cm s℃)
                                 =0.578Btu/(ft.h.F)
                

                
9.Temp.：℃
1oF=9/5℃＋32 　
                1R=9/5℃＋491.67 　
                1K=1℃＋273.15
                

                
Calculating the heater wattage
                

                
 Calculation of the heating wattage refers to the following three point ：
                

                


                


                

Wattage for working 
                

                

Wattagefor startup
                

                

System heat loss
                

                
All the calculation should be under the worst condition：
                

                


                


                

The lowest ambient temp.
                

                

Max process Temp.
                

                

The shortest process cycle
                

                

Max weight for heating medium (as for flowing medium ,it is the max flux)
                

                
The step for designing the heater system：
                

                
 According to the craftwork process, draw the technical flow chart of the heater. (It doesn't contain material and specification)
                 Calculating the needed energy for the craftwork 
                 Calculating the needed energy and time while the system startup
                 Re-draw technical flow chart, and consider the right safety factor, and confirm the total wattage for the heater.  
                 Confirming the jacket material for the hating component and wattage density. 
                 Confirming the size and amount for the heater 
                 Confirming the power supply and control system for the heater
                ??1 2  3  4  5  6  7  8 ??
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