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What is the By-pass factor for heating coil, if td1 = 19°C, td2 = 25°C and td3 = 37°C?

What is the By-pass factor for heating coil, if td1 = 19°C, td2 = 25°C and td3 = 37°C? Correct Answer 0.7

By-pass factor is the amount of air by-passed in the process. So, for heating coil, BPF = Temperature difference between coil and exit / Temperature difference between coil and entry = td3 – td2 / td3 – td1 = 37 – 25 / 37 – 19 = 0.70588 = 0.7.

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