안녕하세요 air cooler 신입사원입니다.

고 점도(21CP) 물질을 cooler 시키는 case 입니다. 다른경우는 문제가 없는데 turn down case를 확인해

보니까 오류 메시지가 많이 나오네요.

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Based on the standard deviation of the Duty Ratio in each increment, the case may not be converged properly.  Nonconvergence usually results from an           
incorrect bundle layout, such as a case with only one or two tubes in a pass on one or more of the rows.  The duty ratio is the assumed duty divided by the           
calculated duty in each increment; the values should be approximately the same for all increments in the exchanger if the case is properly converged.           
           
To check convergence after the case has run.           
           
1.  Click the Graphs tab.           
           
2.  Select Output 3D Profiles.           
           
3.  Plot the Duty Ratio.           
           
If the values in the plot are not within 10%, the case has not converged properly.  Check the bundle layout to ensure that the tubes in the unit are properly           
positioned; the Equal count bundle layout option may result in an unrealistic bundle geometry.  If the unit layout is not as you intended, correct the bundle and           
run the case again.  If you receive this message and the unit is as you intended, do not use the results.  Instead, please e-mail the case to Support@HTRI.net           
for analysis.   

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turn down case 다 보니 overdesign이 200% 정도 나왔습니다. 이것 때문에 메시지가 나온거라고 추정은 되지만 확실치 않아 이렇게 문의 드립니다.

감사합니다