The following warnings appear in the HTRI calculation results; I seek advice from experts
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Warning: The physical properties of the cold fluid have been extrapolated beyond the valid temperature range; please check the calculated values. The physical properties of the hot fluid have also been extrapolated beyond the valid temperature range; please check the calculated values. When entering the physical properties, those corresponding to the average temperature at the inlet and outlet are used (this is how properties are determined when performing manual calculations). Is this related to the issue?
:time: ~~~It’s not like that. . . . . . My guess is that it works like this: If the inlet and outlet temperatures of the hot fluid in your heat exchanger are 300°C and 150°C respectively, then the property values required for HTRI calculations are not only those within this temperature range; property values at 310°C or 140°C might also be necessary. However, when entering these property values manually, you don’t include those from these other temperature ranges. As a result, HTRI uses the data you have entered, applying the software’s own interpolation methods (or extrapolation methods, etc.). . . ) to calculate the material properties that are missing from these manual entries. After completing the calculation, the software kindly reminds you that it used interpolation methods, and asks you to check whether the material property values it has determined are appropriate :lol
Warning: The physical properties of the cold fluid have been extrapolated beyond the valid temperature range. Check the calculated values. The property values obtained through extrapolation for the cold fluid are not valid within that temperature range; therefore, check the calculation results. This means that the temperature range you have set is too narrow. If you increase the temperature range, this warning will not appear. Additionally, even if this warning appears, it does not significantly affect the calculation results, as those results are derived from interpolation, and the relationship between properties and temperature generally follows the pattern of interpolation.
This warning has little impact on the calculation results; if you want to eliminate it, set a higher temperature value and it will be gone!
Try entering the properties of several temperature points with multiple inputs!
Properties of multiple input-related temperature points
It’s because 1/1/1/1 or 0/0/0/0 wasn’t entered at the beginning
Back to floor 7. You must be referring to the division rate; I lost at the beginning
Oh, so did you fill in 1 or 0? If you filled in 1, then when selecting the physical state as ‘mixed’, such a warning will appear
All the fluid flows in the heat exchanger I calculated are liquids, and the flow rate is 0
Oh, is the state of that fluid liquid?