The P value is the ratio of difference between hot fluid inlet temperature and hot fluid outlet temperature to the difference between hot fluid inlet temperature and cold fluid inlet temperature. As the inlet temperature of both hot side and cold side fluid is fixed, the denomitor will not change whether we have temperature cross or temperature approach.
usually the terminal temperature difference between process fluid and service fluid is termed as temperature approach but the way you are defining is wrong
The P value is the ratio of difference between hot fluid inlet temperature and hot fluid outlet temperature to the difference between hot fluid inlet temperature and cold fluid inlet temperature. As the inlet temperature of both hot side and cold side fluid is fixed, the denomitor will not change whether we have temperature cross or temperature approach.
usually the terminal temperature difference between process fluid and service fluid is termed as temperature approach but the way you are defining is wrong
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