Tuesday, September 2, 2014

Did you know that CHEMCAD has offered embedded rigorous heat exchanger modeling for over eight years?

CHEMCAD's CC-THERM module has offered embedded rigorous modeling of heat exchangers for many years. Why is this a valuable tool?

In many cases, general heat transfer calculations for exchangers are sufficient. In other circumstances, though, you really need a more rigorous model. Let's look at a few examples where rigorous heat exchanger modeling can help you obtain faster, more accurate results.

Imagine you're a plant engineer and are asked to find a way to improve throughput. Can your existing heat exchangers handle the increased flow? You can use CC-THERM in Rating mode to enter specifications for the existing exchanger (TEMA type, # of tubes, baffles, etc.) and get the flows, temperatures, and pressures to match current conditions. Then increase the flow in the model to see if you exceed any constraints on the exchanger.

Suppose there's a concern with fouling in a particular stream. You can switch to Fouling Rating mode in CC-THERM to calculate the fouling rate that allows the model to fit reality. Then increase the flow in the model as before, to determine whether the existing exchanger will be sufficient.

Is the exchanger you have not big enough to handle the increased throughput? You can use CC-THERM in Design mode to design a replacement exchanger. Use the specifications of the existing exchanger to create your initial estimates, since you know these specs are close to your requirements. Now you can approach your heat exchanger manufacturers with a much clearer picture of what you need and what their proposed design should look like.

CC-THERM is available as a stand-alone product or as an add-on to your existing CHEMCAD package. Please contact us at 1-800-CHEMCAD for more details!

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