Gas Phase Heat Transfer Coefficient In Dehumidification Calculator

Formula Used:

\[ h_g = \frac{(h_1 \times (t_i - T_l)) - (h_{fg} \times k_y \times (Y_g - Y_i))}{(T_g - t_i)} \]

Liquid Phase Heat Transfer Coefficient (h1):

W/m²·K

Inside Temperature (ti):

Liquid Layer Temperature (Tl):

Enthalpy of Evaporation (hfg):

J/kg·K

Gas Phase Mass Transfer Coefficient (ky):

mol/s·m²

Absolute Humidity of Air(tg) (Yg):

Absolute Humidity (ti) (Yi):

Bulk Gas Temperature (Tg):

Gas Phase Heat Transfer Coefficient (hg):

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1. What is Gas Phase Heat Transfer Coefficient In Dehumidification?

The Gas Phase Heat Transfer Coefficient in dehumidification represents the heat transfer rate in the gas phase per unit area per unit temperature difference. It is a crucial parameter in dehumidification processes where both heat and mass transfer occur simultaneously.

2. How Does the Calculator Work?

The calculator uses the following formula:

\[ h_g = \frac{(h_1 \times (t_i - T_l)) - (h_{fg} \times k_y \times (Y_g - Y_i))}{(T_g - t_i)} \]

Where:

\( h_g \) — Gas Phase Heat Transfer Coefficient (W/m²·K)
\( h_1 \) — Liquid Phase Heat Transfer Coefficient (W/m²·K)
\( t_i \) — Inside Temperature (K)
\( T_l \) — Liquid Layer Temperature (K)
\( h_{fg} \) — Enthalpy of Evaporation (J/kg·K)
\( k_y \) — Gas Phase Mass Transfer Coefficient (mol/s·m²)
\( Y_g \) — Absolute Humidity of Air(tg)
\( Y_i \) — Absolute Humidity (ti)
\( T_g \) — Bulk Gas Temperature (K)

Explanation: This formula calculates the gas phase heat transfer coefficient by considering the energy balance between heat transfer in the liquid phase, enthalpy of evaporation, and mass transfer effects in the gas phase.

3. Importance of Gas Phase Heat Transfer Coefficient Calculation

Details: Accurate calculation of gas phase heat transfer coefficient is essential for designing efficient dehumidification systems, optimizing energy consumption, and ensuring proper moisture removal in various industrial and HVAC applications.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure that temperature values are in Kelvin and all other parameters are in their respective SI units. The difference (Tg - ti) should not be zero to avoid division by zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of gas phase heat transfer coefficient in dehumidification?
A: The gas phase heat transfer coefficient typically ranges from 10 to 100 W/m²·K, depending on the system configuration and operating conditions.

Q2: How does gas phase heat transfer coefficient affect dehumidification efficiency?
A: Higher gas phase heat transfer coefficients generally lead to more efficient dehumidification as they facilitate better heat exchange between the gas and liquid phases.

Q3: What factors influence the gas phase heat transfer coefficient?
A: Factors include gas velocity, temperature difference, surface characteristics, and the physical properties of the gas and liquid involved.

Q4: Can this formula be used for both air and other gases?
A: Yes, the formula is generally applicable to various gases, but the physical properties and coefficients may need adjustment for different gas compositions.

Q5: What are the limitations of this calculation method?
A: The method assumes steady-state conditions and may not accurately represent transient behavior or complex flow patterns in real-world dehumidification systems.