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What is the contact factor for cooling coil, if td1 = 44°C, td2 = 26°C and td3 = 19°C?

What is the contact factor for cooling coil, if td1 = 44°C, td2 = 26°C and td3 = 19°C? Correct Answer 0.72

By-pass factor is the amount of air by-passed in the process. So, for the cooling coil, BPF = Temperature difference between coil and exit / Temperature difference between coil and entry = td2 – td3 / td1 – td3 = 26 – 19 / 44 – 19 = 0.28 ηC = 1 – BPF = 1 – 0.28 = 0.72.

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