SHELL AND TUBE

Shell & tube heat exchangers offer large surface area in combination with efficient heat transfer and compactness. These are widely used in industries for various duties like cooling, heating, condensation, evaporation etc. GOEL are the pioneers in the field of glass shell and tube heat exchangers in India and their product has a wide market acceptability.

Salient Features of Shell and Tube Heat Exchanger :

1.Universal corrosion resistance an excellent alternative to expensive MOCs like graphite, hastelloy, copper titanium, tantalum and other exotic metals.
2. Excellent heat transfer as fouling does not occur on smooth glass surfaces.
3. Flexibility of installation vertical/horizontal.
4. Easy replacement of tubes for repair and cleaning.
5. Available in wide range of HTAs.
6. Ease of installation due to light weight.
7. Economical.
8. Suitable for applications where large HTAs are required in limited space.

Advantages of Shell and Tube Heat Exchanger Over Conventional Coil Type Heat Exchangers :

1. The overall heat transfer coefficient in shell and tube heat exchanger is about 3 times higher than in coil type heat exchanger.
2. The pressure drop in shell and tube heat exchanger is minimal compared to 2-3 kg/cm2 in coil side of coil type heat exchanger.
3. For requirement of higher heat transfer areas shell and tube heat exchanger is the only alternative.

Construction Features of Shell and Tube Heat Exchanger :

The glass tubes are sealed individually into PTFE tube sheet with special PTFE sockets and packing. This unique ferrule type sealing arrangement permits easy replacement and cleaning of tubes. Baffles on shell side ensure improved heat transfer by increased turbulance. Further details of construction can be seen in the diagram.

TYPE:

Three basic versions * are available :

Material Of Construction of Shell & Tube Heat Exchanger
 Model Shell Tube Header Duty
 RGG Glass Glass Glass For heat transfer between two aggressive media.
 RGM Glass Glass Steel/FRP For heat transfer between aggressive media in shell & non-aggressive media in tubes. 
 RMG Steel/FRP Glass Glass For heat transfer between aggressive media in tubes & non-aggressive media in shell
 * GOEL provides assistance to clients for selecting the right model for specific duty.

* GOEL provides assistance to clients for selecting the right model for specific duty.

Dimensional Specifications of Shell and Tube Heat Exchanger :
Cat.Ref.
 RGG/RMG
6/3
6/4
6/5
6/6
9/6
9/8
9/10
9/12
12/12
12/16
12/21
12/25
Area (m2)
3
4
5
6
6
8
10
12
12
16
21
25
 DN
150
225
300
 DN1
80
100
150
 DN2
50
80
80
 DN3
25
40
40
 DN4
50
50
50
 H1
175
250
300
 H2
150
200
250
 L
2500
3100
3700
4300
2620
3220
3820
4520
2550
3150
3950
4550
 L1
1900
2500
3100
3700
1900
2500
3100
3800
1800
2400
3200
3800
 L2
150
150
150
150
225
225
225
225
225
225
225
225
 L3
1600
2200
2800
3400
1450
2050
2650
3350
1350
1950
2750
3350
 L4
250
250
250
250
300
300
300
300
300
300
300
300
 L5
125
125
125
125
175
175
175
175
175
175
175
175
 L6
1980
2580
3180
3780
2000
2600
3200
3900
1930
2530
3330
3930
 T
50
60
75
 No. of   Tubes
37
73
151
 No. of  Baffles
11
15
19
23
7
9
13
17
5
7
9
11
 
Range Of Applications :

Permissible temperature range for both shell & tube sides - 40° C to 150° C.
Maximum permissible temperature difference between shell & tube sides 120° C.

All sizes & models are suitable for full vacuum on both side. Maximum limiting pressures are tabulated here below :
 

   
Maximum Permissible Pressure Range, Kg/cm2(g)
 Model
Side
150DN
225DN
300DN
 RGG
Shell
Tube
2.0
2.0
1.0
1.0
1.0
1.0
 RGM
Shell
Tube
2.0
3.5
1.0
3.5
1.0
3.5
 RMG
Shell
Tube
3.5
2.0
3.5
1.0
3.5
1.0

The above ranges of applications are admissible limiting values. For each specific case GOEL recommends the admissible operating data based on the relations between pressure and temperature, size and model.

 
Performance & Design Data :

The particular advantage of shell & tube heat exchanger is high heat transfer performance. The relation between heat transfer and velocity of flow can be easily seen in the diagram. On receipt of the operating data from client the most favourable shell and tube heat exchanger is selected. This accurate design combined with most reliable quality assurance ensures economy and operational reliability for the user. For approximate sizing some typical heat transfer coefficients are given here below :
 

   
U-Values
 Media
Use
kcal/m2hrk
W/m2k300
 DN      
 Steam water
condensation
350-550
410-640 
 Water - water
cooling
250-350
290-410
 Water - air
cooling
30-60
35-70