COIL CONDENSER

Coil Condensers are used for condensation of vapours and cooling of liquids. Condensers are made by fusing number of parallel coils in a glass shell. Coils are made in different diameters using tubes of different bores.

The average co-efficient of heat transfer in coil condenser is considered as :-
Condensation 200 - 270 Kcal/m2, hr, °C appx.
Cooling 100 - 150 Kcal/m2, hr, °C appx.

 Cat. Ref.

DN

d/DN1

L

L1

Type

Actual
H.T.A.
m2

Cross 
Area 
Cm2

Free
Coolant
Rate
kg/hr.

Max.
Jacket
Cap.
Litre

 HE3/3.5*

80

16

600

75

A

0.35

5

1300

2

 HE4/5*

100

19

600

75

A

0.50

30

2400

4

 HE4/6

100

19

750

100

A

0.60

30

2400

6

 HE6/10

150

25

600

100

B

1.00

52

2600

9

 HE6/15*

150

25

850

100

B

1.50

52
2600

11

 HE9/25*

225

25

800

110

B

2.50

125

3300

18

 HE12/25

300

25

600

125

B

2.50

175

5700

25

 HE12/40*
300
25
900
125
B
4.00
175
5700
35
 HE16/40
400
25
600
125
B
4.00
450
6200
60
 HE16/50

400

25

700

125

B

5.00

450

6200

70

 HE18/60
450
40
750
150
C
6.00
820
4800
100
 HE18/80

450

40

900

150

C

8.00

820

6200

110

 HE24/120
600
50
1250
300
C
12.00
1520
6200
265
Precautions to be taken in use of coil condensers :

- Vapours should be passed through shell only.
- Maximum pressure of coolant should be 2.7 bars.
- Adequate flow of coolant should be used.
- Steam should not be used in coils.
- Coolant should not be heated to boiling point.
- Coolant control valve should be turned slowly.
- Coolant should be allowed to drain freely.
- Brine can be used in coils in a closed circuit.
- Water main should be connected with flexible hose.
- Ensure no freezing of water remaining in the coils.
- Condensers should be mounted vertically only.
- Condensers can be mounted in series to provide larger surface area.

Methods of Use of Coil Condenser :

Vapours from bottom

This method is simple to install over a reactor. However this results in condensate returning substantially at its condensing temperature. In this method care must be taken that condensate is not excessive that it can lead to "logging" the coils and create back pressure in the system. Generally a reflux divider is used below the condenser to take out the distillate.

Vapors from top

This method produce a cool condensate using the entire coolinlg surface area. This method should be used where the condensate can lead to "logging" of coils.

BOILERS

Boilers are used for vaporization of liquids by passing the steam in the coils. Boilers are made by fusing number of parallel coils in a glass shell. In Boilers, coils are designed to provide bigger cross section in the shell side as compared to condensers. o The average heat transfer in Boilers is considered as 350 Kcal/m2,hr, C at a steam pressure of 3.5 bar.

 Cat.  Ref.

DN

DN1

DN2

L

L1

Type

Actual
H.T.A. m2

Free
Cross 
Area 
Cm2

Jacket Cap. Litre

 HEB4

100

25

25

375

100

A

0.15

40

2

 HEB4/4

100

100

25

400

100

B

0.15

40

3

 HEB6

150

40

25

450

100

A

0.35

50

5

 HEB6/6

150

150

25

500

100

B

0.35

50

7

 HEB9

225

40

25

700

100

A

1.00

150

16

 HEB9/9

225

255

25

700

100

B

1.00

180

20

 HEB12/12

300

300

25

700

125

B

1.30

330

40

Note on use of Boilers :

1. Steam should be passed in the coils at a maximum pressure of 3.5 bar which is equalant to a temperature of 147 °C.
2. For higher temperature (maximum upto 200 °C) heat transfer fluids can be passed in the coils. - Cold liquids
3. Cold liquids should be preheated for better results.
4. Boilers should bemounted in an external circulatory loop (as shown in figure) and not direct at the bottom of flask or column
5. Under certain circumstances, boilers can be mounted in series to provide larger heat transfer area.

ANGLED HOSE CONNECTOR ASSEMBLIES

Metal/Plastic angled hose connector assemblies are available to connect the flexible hose to the condensers. These are provide with a mating flange, a rubber gasket and nut bolts.

Cat.Ref.

DN

d

L

 PMC1

25

22

70

IMMERSION

Immersion heat exchangers are used to control exothermic reaction in glass vessels. They can be used with vessels having wider bottom outlet (type VSR and VSE). These are provided with a central hole through the coil battery so that a special, extended type, stirrer can be fitted which extends to the bottom of heat exchanger and provide through action.

In most applications, cooling water is used in coils (max. pressure 2.7 bar g.), but they can also be used with steam (max. pressure 3.5 bar g.). In latter case the coils must be completely immersed in liquid. Immersions are not recommended for use with products which have a tendency to crystalise.

Cat. Ref.

DN

DN1

DN2

L

L1

L2

d

Actual
H.T.A.
m2

 HEM6

150

40

25

200

200

75

145

0.4

 HEM9

225

40

25

300

200

75

200

0.6

PRODUCT COOLERS

Product coolers are used for cooling of liquids, typically, for the cooling of distillates from the distillation columns. Unlike coil condensers, in product coolers, product travels through the coil battery and coolant through shell. This provides more resident time to the product to be cooled. For direct connection with distillate lines, all the product coolers are provided with 25 DN connections.

Cat.Ref.

DN

DN1

DN2

L

Actual HTA 
m2

TYPE
 HEF1/1*

50

25

12

450

0.1

A
 HEF1/2*

50

25

12

600

0.2

A
 HEF1/3.5*

80

25

16

600

0.35

A
 HEF1/5*

100

25

19

600

0.5

A
 HEF1/10

150

25

25

600

0.7

B
 HEF1/15

150

25

25

850

1.25

B