Mass Transfer Coefficient Formula:
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Definition: This calculator determines the mass transfer coefficient of moisture in air using wet bulb temperature measurements and related thermodynamic properties.
Purpose: It's essential for designing and analyzing humidification, drying, and air conditioning systems where mass transfer plays a crucial role.
The calculator uses the formula:
Where:
Explanation: The temperature difference drives the calculation, normalized by humidity difference and scaled by the ratio of heat transfer to vaporization energy.
Details: Accurate determination of mass transfer coefficients is critical for designing efficient heat and mass transfer equipment in chemical, food, and HVAC industries.
Tips: Enter all required parameters in consistent units. Ensure wet bulb temperature is lower than air temperature and humidity at wet bulb is greater than ambient humidity.
Q1: What is the physical significance of kY'?
A: It represents how easily moisture transfers between air and water surfaces per unit driving force.
Q2: How do I measure wet bulb temperature?
A: Use a psychrometer with a thermometer wrapped in a wet wick exposed to air flow.
Q3: What's a typical value for hG?
A: For air-water systems, it typically ranges from 10-100 W/m²·K depending on air velocity.
Q4: Why is λW important?
A: It accounts for the energy required for phase change, linking heat and mass transfer.
Q5: Can this be used for other vapor-liquid systems?
A: Yes, but properties (hG, λW) must be for the specific system.