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Chem Sys

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SHELL & TUBE HEAT EXCHANGER DESIGN

TFD-HE13 - Shell & Tube Heat Exchager Design

1

Introduction q Shell & tube heat exchangers are the most versatile type of heat exchangers.

§ They are used in process industries, in conventional and nuclear power stations, steam generators, etc

§ They are used in many alternative energy applications including ocean, thermal and geothermal. q Shell & tube heat exchangers provide relatively large ratios of heat transfer area to volume. They can be easily cleaned.

q

TFD-HE13 - Shell & Tube Heat Exchager Design

2

Shell & Tube Heat Exchangers q Shell & tube type heat exchangers are built of tubes (round or rectangular in general) mounted in shells (cylindrical, rectangular or arbitrary shape). Many variations of this basic type is available.

q

§ The differences lie mainly in the detailed features of construction and provisions for differential thermal expansion between the tubes and the shell.

Shell inlet

Tube inlet

Tube outlet

Shell outlet

TFD-HE13 - Shell & Tube Heat Exchager Design

3

Shell & Tube Heat Exchangers

U-Tube, baffled, single pass shell & tube heat exchanger

Two pass tube, baffled single pass shell & tube heat exchanger

Two pass tube, floating head, baffled single pass shell & tube heat exchanger
TFD-HE13 - Shell & Tube Heat Exchager Design 4

Shell Types q q

TEMA (the Tubular Exchangers Manufacturers Association) publishes standards defining how shell and tube exchangers should be built. They define a naming system that is commonly used. Shells are also typically purchased in standard sizes to control costs. Inside the shell, baffles (dividers) are installed to direct the flow around the tubes, increase velocity, and promote cross flow. They also help support the tubes. The baffle cut is the ratio of the baffle window height to the...

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