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What is the contact factor for cooling coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature?

What is the contact factor for cooling coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature? Correct Answer td1 – td2 / td1 – td3

Contact factor or efficiency of the coil is 1 – By-pass factor. So, for cooling coil, ηC = 1 – BPF = 1 – = td1 – td2 / td1 – td3.

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