How to manage the number of Tubesheets in a heat exchanger
The user must know what they want:
1. If the number of tubes is leading the bundle dimensions, user should only enter the number of tubes, and let blank OTL and Internal diameter.
2. If the OTL is known, user should only fill in this value.
3. If the Internal diameter is fixed, user should only set this value.
Setting two fields can lead to over constraints that can lead to unsolvable bundle.
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