Introduction :

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.

- Made from SCHOTT DURAN.

- Joint less tubes offer better pressure rating.

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.

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Dimensional Specifications :

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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 16/21 16/25
Area (m2) 3 4 5 6 6 8 10 12 12 16 21 25 21 25
DN 150 225 300 400
DN1 80 100 150 225
DN2 50 80 80 100
DN3 25 40 40 50
DN4 50 50 50 80
H1 175 250 300 450
H2 150 200 250 300
L 2500 3100 3700 4300 2620 3220 3820 4520 2550 3150 3950 4550 3100 3500
L1 1900 2500 3100 3700 1900 2500 3100 3800 1800 2400 3200 3800 2000 2400
L2 150 150 150 150 225 225 225 225 225 225 225 225 400 400
L3 1600 2200 2800 3400 1450 2050 2650 3350 1350 1950 2750 3350 1200 1600
L4 250 250 250 250 300 300 300 300 300 300 300 300 550 550
L5 125 125 125 125 175 175 175 175 175 175 175 175 225 225
L6 1980 2580 3180 3780 2000 2600 3200 3900 1930 2530 3330 3930 2185 2585
T 50 60 75 100
No. of Tubes 37 73 151 241
No. of Baffles 11 15 19 23 7 9 13 17 5 7 9 11 5 7

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 :

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MAXIMUM PERMISSIBLE PRESSURE RANGE, KG/CM2(G)
Model Side 150DN 225DN 300DN
RGG Shell-Tube
Tube-Glass
Dome-Glass
2.0
2.0
1.0
1.0
1.0
1.0
RGM Shell-Tube
Tube-Glass
Dome-Glass
2.0
3.5
1.0
3.5
1.0
3.5
RMG Shell-Tube
Tube-Glass
Dome-Glass
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 mode

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
 Steam water condensation 350-550 410-640 
 Water – water cooling 250-350 290-410
 Water – air cooling 30-60 35-70
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