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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/
^{o}
C
3
Temperature of inlet Juice
^{o}
C
4
Temperature of outlet Juice
^{o}
C
5
Vapour Temperature (Heating Media)
^{o}
C
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)
M
^{3}
/kg
Result
1
Vapour Quantity Required
(Juice Quantity x Specific heat of the juice x ΔT) / Latent heat of vapour.
T/hr
M
^{3}
/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 top 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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