Thermal Transfer Systems TEMA Designations of Heat Exchangers User Manual
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when the flow rate permits the use of one half of the shell at a time. In heat recovery
applications, or where the application calls for increased thermal length to achieve effective
overall heat transfer, shells can be installed with the flows in series.
Up to six shorter shells in series is common and results in counter-current flow close to
performance as if one long shell in a single pass design were used.
TEMA G and H shell designs are most suitable for phase change applications where the bypass
around the longitudinal plate and counter-current flow is less important than even flow
distribution. In this type of shell, the longitudinal plate offers better flow distribution in vapor
streams and helps to flush out non-condensables. They are frequently specified for use in
horizontal thermo-siphon re-boilers and total condensers.
Heat Exchanger TEMA type AES
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