Mohamed samy
Mechanical
How to calculate impingement plate dimension for shell and tube heat exchanger , tema show the calculation of shell and bundle entrance areas.... how can i use these equation
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Entrance area of shell and bundle . How to calculate and compare with tema min areas
- Thread starter Mohamed samy
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Mohamed samy, I believe you are asking about the equations to calculate entrance areas into the shell and bundle, TEMA RGP-RCB-4.62 and following.
Usually you want these areas to be equal or greater than the inlet nozzle area, so that the flow velocity is not increased above the value in the nozzle.
The various dimensions are obtained from the exchanger rating data, tubefield layout, dimensional layout and so forth.
About the impingement plate in particular, the diameter should be found in the rating data, usually as a factor on the nozzle diameter. If not, a couple of rules of thumb may be used: Minimum of 2 inch larger than the nozzle diameter, or sometimes it is defined by a line 30 deg off the nozzle ID at the shell ID intersection. Note this diameter would be usually larger if defined by the longitudinal section rather than the transverse section.
The appropriate values are placed in the appropriate equations and the results calculated and compared to the nozzle area. If either is smaller than the nozzle area the design must be reconsidered, possibly from the rating stage as well. It may be necessary to add increase the shell ID, change the baffle spacing or type, use impingement rods rather than a plate, add a distributor (vapor) belt, etc.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
Usually you want these areas to be equal or greater than the inlet nozzle area, so that the flow velocity is not increased above the value in the nozzle.
The various dimensions are obtained from the exchanger rating data, tubefield layout, dimensional layout and so forth.
About the impingement plate in particular, the diameter should be found in the rating data, usually as a factor on the nozzle diameter. If not, a couple of rules of thumb may be used: Minimum of 2 inch larger than the nozzle diameter, or sometimes it is defined by a line 30 deg off the nozzle ID at the shell ID intersection. Note this diameter would be usually larger if defined by the longitudinal section rather than the transverse section.
The appropriate values are placed in the appropriate equations and the results calculated and compared to the nozzle area. If either is smaller than the nozzle area the design must be reconsidered, possibly from the rating stage as well. It may be necessary to add increase the shell ID, change the baffle spacing or type, use impingement rods rather than a plate, add a distributor (vapor) belt, etc.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
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