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PHE 1 general (plate heat exchanger)

PHE General

Flow principle and parts

The Gasketed Plate Heat
Exchanger
– The PHE –

• The function of the plate pack – Single pass:

1


PHE General

The Gasketed Plate Heat
Exchanger
– The PHE –

• The function of the plate pack – Multi pass:


The Gasketed Plate Heat
Exchanger
– The PHE –
• The plate corrugation has two
functions:

Mechanical

Flow dynamic

2


PHE General

The Gasketed Plate Heat
Exchanger
– The PHE –

• Two plate corrugations L and H:

L: Low theta

H: High theta

The Gasketed Plate Heat
Exchanger
– The PHE –

• Two plate corrugations may form three
different interplate channels:

L + L = L channels

H + H = H channels

L + H = M channels

3



PHE General

PHE groupings influence on
performance
Example





Product: 5 000 kg/h raw milk, inlet temp 20º C
Service: 15 000 kg/h water, inlet temp 1º C
PHE:
Clip-6RM with 17 plates = 2,75m²
Channels:
Low, high and mixed theta

Parallell grouping
Example 1 * 8

1*8

4


PHE General

PHE groupings influence on
performance
• Low pressure drop
• Low heat transfer
Grouping

Temp
program, ºC

Pressure k-value, Heat
drop, kPa W/m², ºC transfer, kW

1 * 8 L
1 * 8 L

20 ! 9.0
4.4  1

3
21

1860

60

1 * 8 H
1 * 8 H

20 ! 6.0
5.4  1

12
105

2980

76

1 * 8 MH 20 ! 7.7
1 * 8 ML 4.8  1

5
45

2280

67

Series grouping
Example 8 * 1

8*1

5


PHE General

PHE groupings influence on
performance
•High pressure drop
•High heat transfer
Grouping

Temp
program, ºC

Pressure
drop, kPa

k-value,
W/m², ºC

Heat
transfer, kW

8 * 1 L
8 * 1 L

20 ! 2.5
6.5  1

1090
9450

6180

96

8 * 1 H
8 * 1 H

20 ! 1.6
6.7  1

5750
49500

8690

101

8 * 1 MH
8 * 1 ML

20 ! 1.9
6.6  1

2400
19700

7370

99

Combined grouping (symmetric)
Example 4 * 2

4*2

6


PHE General

PHE groupings influence on
performance

Grouping

Temp
program, ºC

Pressure
drop, kPa

k-value,
W/m², ºC

Heat
transfer, kW

4 * 2 L
4 * 2 L

20 ! 4.0
6.0  1

140
1210

4260

87

4 * 2 H
4 * 2 H

20 ! 2.4
6.5  1

740
6350

6300

96

4 * 2 MH
4 * 2 ML

20 ! 3.2
6.2  1

315
2580

5150

92

Combined grouping (asymmetric)
Example 4 * 2

2*4

7


PHE General

PHE groupings influence on
performance

Grouping

Temp
program, ºC

Pressure
drop, kPa

k-value,
W/m², ºC

Heat
transfer, kW

4 * 2 L
2 * 4 L

20 ! 4.8
5.7  1

140
160

3670

83

4 * 2 H
2 * 4 H

20 ! 3.1
6.3  1

740
815

5280

93

4 * 2 MH
2 * 4 ML

20 ! 3.9
6.0  1

315
340

4390

88

8


PHE General

Milk pasteurization
Parameters










Capacity
Temp programme; in, out, past
Running costs
Running times
Separation, temperature, skimming
Homogenisation, temperature, pressure
Deaeration, temperature, temperature drop
Heating media, cooling media
Drainability

Milk pasteurization
Heat Recovery








Capacity
Running hours
Cleaning intervals
Media costs
Product costs
Maintenance
Capital cost

+
+
+
+
-

9


PHE General

Heat Recovery
Product
inlet
Pasteurisation
temperature
IW

A

Cooler

B

C

Regenerative

D

HW

C

B-A
C-A

Heat recovery =

Example:

Heater

A = 4°C
B = 67°C
C = 74°C

x 100 (%)

67 - 4
74 - 4

x 100 =

63 x 100 = 90 %
70

Heat Recovery
Milk Pasteurizer
80000
70000
60000

EUR

50000
Series1

40000

Series2

30000
20000
10000
0
75

80

85

90

95

100

Regenerative

10



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