Shell & tube heat exchangers

Shell & tube heat exchangers offer a 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 is the pioneer in the field of glass shell and tube heat exchangers in India and their product has wide market acceptability.

Shell and Tube Heat Exchanger

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 :

Shell & Tube Heat Exchanger

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 the coil side of coil type heat exchanger.
3. For the 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.

Three basic versions * are available :

Material Of Construction of Shell & Tube Heat Exchanger
 ModelShellTubeHeaderDuty
 RGGGlassGlassGlassFor heat transfer between two aggressive media.
 RGMGlassGlassSteel/FRPFor heat transfer between aggressive media in shell & non-aggressive media in tubes. 
 RMGSteel/FRPGlassGlassFor 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 :

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Cat.Ref.
 RGG/RMG
6/36/46/56/69/69/89/109/1212/1212/1612/2112/25
Area (m2)345668101212162125
 DN150225300
 DN180100150
 DN2508080
 DN3254040
 DN4505050
 H1175250300
 H2150200250
 L250031003700430026203220382045202550315039504550
 L1190025003100370019002500310038001800240032003800
 L2150150150150225225225225225225225225
 L3160022002800340014502050265033501350195027503350
 L4250250250250300300300300300300300300
 L5125125125125175175175175175175175175
 L6198025803180378020002600320039001930253033303930
 T506075
 No. of   Tubes3773151
 No. of  Baffles1115192379131757911

Shell and Tube Heat Exchanger 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)
 ModelSide150DN225DN300DN
 RGGShell
Tube
2.0
2.0
1.0
1.0
1.0
1.0
 RGMShell
Tube
2.0
3.5
1.0
3.5
1.0
3.5
 RMGShell
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.

Shell and Tube Heat Exchanger 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
 MediaUsekcal/m2hrkW/m2k300
 DN   
 Steam watercondensation350-550410-640 
 Water – watercooling250-350290-410
 Water – aircooling30-6035-70