How to interpolate the correction factor F

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For R=3.62, the graph indicates a maximum value of P at approximately 0.24. A reported value of P at 0.28 is identified as potentially erroneous. The discussion emphasizes the importance of accurate interpolation of the correction factor F. Participants are encouraged to verify their calculations against the graph. Accurate data interpretation is crucial for reliable results in this context.
anonymous99
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Homework Statement
I'm working on a heat exchanger problem. The problem requires me to determine the heat transfer area for a shell-and-tube exchanger. I need the correction factor F to solve this problem but I'm not sure how to interpolate the chart below for it. I've worked out the temperature effectiveness P to be 0.28 and the Heat Capacity Ratio R to be 3.62 so how would I interpolate the chart to get a more accurate correction factor? I know to use the gradient but not sure how to apply it here.
Relevant Equations
The values on the x-axis are P. Each curve corresponds to a value of R.
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According to the graph, for R=3.62, the maximum value for P is about 0.24.
Your value of P=0.28 would seem to be in error.
 

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