• Psychrometric Coil Contact Factor Calculation:
• Given Parameters:
• Entering dry-bulb temperature: $t_{d1} = 44^\circ\text{C}$
• Leaving dry-bulb temperature: $t_{d2} = 26^\circ\text{C}$
• Apparatus Dew Point (ADP / coil surface temperature): $t_{d3} = 19^\circ\text{C}$
• Contact Factor Formula:

$$\text{Contact Factor (CF)} = \frac{t_{d1} - t_{d2}}{t_{d1} - t_{d3}} = \frac{44 - 26}{44 - 19} = \frac{18}{25} = 0.72$$ $$(\text{Bypass Factor} = 1 - 0.72 = 0.28)$$

• Conclusion: 0.72 (Option 2).

Correct option: (2) 072