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Which one of the following dirt factor should we assign to the HE for two moderately clean streams?

Which one of the following dirt factor should we assign to the HE for two moderately clean streams? Correct Answer UD = 20, UC = 30

We should always assign the higher value of Rd so that the cleaning is done beforehand. Here the maximum value of Rd is for minimum U, i.e. we have Rd = (30-20)/30×20 = 0.0167 is the highest for UD = 20, UC = 30.

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