Condensate Juice Heater (Duplex)Calculation        (Liquid - Liquid heater)     
Input Data (yellow colour cell)      
S.No Description Value UOM    
1 Crushing rate TCH      
2 Mixed Juice % cane %    
3 Velocity of Juice m/sec    
4 Juice inlet temperature oC    
5 Condensate Inlet temperature oC    
6 Condensate Outlet temperature requirement oC    
7 Specific heat of juice
Author:
Sp.heat of juice =1- 0.006Bx
 Kcal/kg    
8 Legment mm    
9 Tube OD mm    
10 Tube Thk mm    
11 Tube length mm    
12 Tube plate thk mm    
13 Quantity of Condensate water percent on Mixed Juice
Author:
Generally taken total condensate 80 to 90% on Mixed Juice for steam% cane is 40%
%  
14 Heat transfer coefficient
Author:
For Duplex Heater this value lies 1200±50 and for Normal condensate heater with proper baffle plate arrangement lies 1000±50
 Kcal/m2/hr/oC  
15 proportional factor(β)      
16 Heating media (hot water) velocity m/sec    
Result  
S.No Description Value Say UOM  
1 No. of tubes per pass
Author:
Volume of juice in M3/sec / [area of one tube in M2 x Velocity of juice in m/sec]
 Tubes/pass  
2 Juice Outlet Temperature Getting
Author:
M x Cp x (to - ti) = Q x Cw x (To- Ti)
  oC  
3 Heating Surface Requirement
Author:
Heating Surface =S = [Q x Cp x ∆T]/ [ K x ∆Tm]
 M2  
4 No. of tubes Requirement
Author:
No. of tubes Requirement = N = S/ [π x Mean dia of tube x Tube effective length]
 no.s  
5 No. of passes Requirement
Author:
Number of passes = n = Total no. of tubes / number of tubes per pass
Must be take even passes only
 no.s  
  According to taken even passes        
6 Actual no. of tubes   No.s  
7 Actual heating surface   M2  
8 Actual velocity   m/sec  
9 pressure drop across the juice heater
Author:
Pressure drop across the juice heater = 0.0025 x no. of passes(n) x (Actual velocity of juice)2 x [(L/ID) + 3]
   MWC  
10 Pitch of the Tube
Author:
OD+legment+tube tolerance+hole tolerance
   mm  
11 Tube plate dia (for one pass)
Author:
Taken 10% extra on required area
 mm  
12 Tube plate dia (for Two pass)
Author:
Taken 10% extra on required area
 mm  
13 Tube plate dia (for Multi pass)
Author:
Taken 10% extra on required area
 mm  
14 Hot water ( heating media) line dia mm