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What is the contact factor for heating coil, if td1 = 11°C, td2 = 32°C and td3 = 47°C?

What is the contact factor for heating coil, if td1 = 11°C, td2 = 32°C and td3 = 47°C? Correct Answer 0.5833

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 = 47 – 32 / 47 – 11 = 0.4167 ηH = 1 – BPF = 1 – 0.4167 = 0.5833.

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