Liquid Phase Heat Transfer Coefficient In Dehumidification Calculator

Formula Used:

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

Gas Phase Heat Transfer Coefficient (h_g):

W/m²·K

Bulk Gas Temperature (T_g):

°C

Temperature at Inner Surface (T_i):

°C

Enthalpy of Evaporation (h_fg):

J/kg·K

Gas Phase Mass Transfer Coefficient (k_y):

mol/s·m²

Absolute Humidity of Air (Y_g):

kg/kg

Absolute Humidity at T_i (Y_i):

kg/kg

Liquid Layer Temperature (T_l):

°C

Liquid Phase Heat Transfer Coefficient (h₁):

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1. What is Liquid Phase Heat Transfer Coefficient?

The Liquid Phase Heat Transfer Coefficient represents the heat transfer efficiency in the liquid phase per unit area per kelvin temperature difference. In dehumidification processes, it quantifies how effectively heat is transferred between the liquid layer and the surrounding environment.

2. How Does the Calculator Work?

The calculator uses the comprehensive heat transfer formula:

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

Where:

\( h_g \) — Gas phase heat transfer coefficient (W/m²·K)
\( T_g \) — Bulk gas temperature (°C)
\( T_i \) — Temperature at inner surface (°C)
\( h_{fg} \) — Enthalpy of evaporation (J/kg·K)
\( k_y \) — Gas phase mass transfer coefficient (mol/s·m²)
\( Y_g \) — Absolute humidity of air at T_g (kg/kg)
\( Y_i \) — Absolute humidity at T_i (kg/kg)
\( T_l \) — Liquid layer temperature (°C)

Explanation: This formula accounts for both sensible heat transfer and latent heat effects due to evaporation/condensation in dehumidification processes.

3. Importance in Dehumidification Processes

Details: Accurate calculation of liquid phase heat transfer coefficient is crucial for designing efficient dehumidification systems, optimizing energy consumption, and predicting system performance in various environmental conditions.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure temperature differences are valid (T_i ≠ T_l) and all transfer coefficients are positive values for meaningful results.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for liquid phase heat transfer coefficient?
A: The values typically range from 500 to 5000 W/m²·K, depending on the fluid properties, flow conditions, and system geometry.

Q2: How does this differ from overall heat transfer coefficient?
A: This specifically quantifies heat transfer in the liquid phase only, while overall heat transfer coefficient considers all resistances in series.

Q3: What factors affect the liquid phase heat transfer coefficient?
A: Fluid properties, flow velocity, surface geometry, temperature gradient, and presence of turbulence significantly influence this coefficient.

Q4: When is this calculation particularly important?
A: This is critical in dehumidification systems, evaporative coolers, condensation processes, and any application involving phase change heat transfer.

Q5: Can negative values occur and what do they indicate?
A: Negative values may indicate reverse heat flow or calculation errors. Always verify input parameters and temperature relationships.