Direct Contact Heater Design Calculation 
Inputs = Yellow colour cells
S.No Description Values UOM
1 Juice flow rate T/hr
2 Specific heat of juice Kcal/kg/oC
3 Temperature of inlet Juice oC
4 Temperature of outlet Juice oC
5 Vapour Temperature (Heating Media) oC
6 Velocity of juice i/l m/sec
7 Velocity of juice o/l m/sec
8 Velocity of vapour at I/L m/sec
9 Velocity of vapour at annulus m/sec
10 Velocity of NCG m/sec
11 Top Baffle Angle Deg.
12 Bottom Baffle Angle Deg.
13 Bottom Cone Angle Deg.
14 No. of Baffles no.s
16 Shell thickness 4 mm
  Latent Heat of Vapour (Heating Media) Kcal/kg
  Specific Volume of vapour (Heating Media) M3/kg
Result
1 Vapour Quantity Required 
(Juice Quantity x Specific heat of the juice x ΔT) / Latent heat of vapour.
T/hr
    M3/sec
2 Dia of bottom baffle
Author:
SQRT ( Vapour Qty in M3/sec x 4 / (π x Velocity of vapour at annulus in m/sec).
mm
  Say mm
3 Dia of vapour inlet
Author:
SQRT [ ( vapour Qty in M3/sec x 4) / (π x Velocity of inlet vapour) ].
mm
  Say mm
4 Dia of juice inlet
Author:
SQRT [ ( Juice inlet Qty in M3/sec x 4 ) / (π x Velocity of inlet juice)].
 
  Say mm
5 Dia of juice outlet
Author:
SQRT ( (Juice inlet Qty + Condensate Qty in M3/sec) x 4 / (π x Velocity of outlet juice in m/sec).
 
  Say mm
6 Dia of NCG vent
Author:
SQRT (Qty of NCG vapours in M3/sec x 4 / (π x Velocity of NCG in m/sec)
 
  Say mm
7 Dia of top baffle
Author:
Dia of bottom baffle + (100mm to 120mm)
mm
8 Dia of the shell
Author:
SQRT [ (Dia of bottom baffle)2 + (Dia of top baffle)2]
 
  Say mm
9 Dia of bottom annulus
Author:
Dia of bottom annulus = Dia of bottom baffle
mm
10 Height of bottom cone
Author:
Tan φ [(ID of Shell dia - juice outlet dia)/2] ( (Here φ = Bottom cone in Deg.)
mm
11 Height of the bottom baffle
Author:
Tan φ [(ID of Shell dia - Dia of bottom baffle) / 2] ( (Here φ = Bottom Baffle Angle in Deg.)
mm
12 Height of the top baffle
Author:
Tan φ [(Dia of top baffle) / 2] ( (Here φ = Top Baffle Angle in Deg.)
mm
13 Height of the bottom annulus
Author:
Dia of the vapour inlet + (50 to 100mm)
mm
14 Height of bottom cone
Author:
( for below 1100mm shell dia it will take 175mm and above 1100mm dia will take 345mm)
mm
15 Height between top and bottom baffles
Author:
It is nearly having 40 to 60mm.
mm
16 Height between bottom and top baffles
Author:
It is nearly having 25 to 50mm.
mm
17 Height between top cone and juice inlet
Author:
Vapour space height consider 1500mm to 2000mm.
mm
18 Height between top baffle and bottom annulus
Author:
It is nearly having 200 to 250mm.
mm
19 Gap between Jc inlet and bottom baffle
Author:
It is nearly having 200 to 250mm.
mm
       
20 Total height. of the heater
Author:
Height of the top cane+ Height of the vapour space above the baffle arrangement + Dia of the juice inlet + Gap between Juice inlet and bottom baffle + (Number of baffles x Height of the bottom baffle) + (Number of baffles x Height of the top baffle ) + (Number of baffles x Height between bottom and top baffles) + (Number of baffles x Height between top and bottom baffles) + Height between top baffle and bottom annulus + Height of the bottom annulus + Height of the bottom cone.
mm
 
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