The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)

• A. <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/432-343-1.png">
• B. <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/432-343-2.png">
• C. <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/432-343-3.png">
• D. <img src="/_files/images/mechanical-engineering/heat-transfer-refrigeration-and-air-conditioning/432-343-4.png">