Boiling Water Evaporation Rate Calculator

Evaporation Rate Equation:

\[ ER = \frac{P \times A \times (X_s - X)}{L \times \rho} \]

Pressure (P):

Surface Area (A):

m²

Saturation Humidity Ratio (Xₛ):

dimensionless

Ambient Humidity Ratio (X):

dimensionless

Latent Heat of Vaporization (L):

J/kg

Density (ρ):

kg/m³

Evaporation Rate (ER):

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1. What is the Boiling Water Evaporation Rate?

The boiling water evaporation rate calculates how quickly water evaporates from a boiling surface under specific conditions. This is important in various engineering applications including heat transfer systems, industrial processes, and environmental studies.

2. How Does the Calculator Work?

The calculator uses the evaporation rate equation:

\[ ER = \frac{P \times A \times (X_s - X)}{L \times \rho} \]

Where:

\( ER \) — Evaporation rate (kg/s)
\( P \) — Pressure (Pa)
\( A \) — Surface area (m²)
\( X_s \) — Saturation humidity ratio (dimensionless)
\( X \) — Ambient humidity ratio (dimensionless)
\( L \) — Latent heat of vaporization (J/kg)
\( \rho \) — Density (kg/m³)

Explanation: The equation calculates evaporation rate based on the driving force (humidity difference) and the energy required for phase change.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate calculation is crucial for designing heat exchangers, cooling systems, distillation processes, and understanding environmental water cycles.

4. Using the Calculator

Tips: Enter all values in the specified units. Ensure pressure, area, latent heat, and density are positive values. The humidity ratio difference (Xₛ - X) should be positive for evaporation to occur.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical latent heat of vaporization for water?
A: At 100°C, the latent heat of vaporization for water is approximately 2,257,000 J/kg.

Q2: How does pressure affect evaporation rate?
A: Higher pressure generally increases evaporation rate by increasing the driving force for mass transfer.

Q3: What are typical values for humidity ratios?
A: Saturation humidity ratio depends on temperature and pressure, while ambient humidity ratio varies with environmental conditions.

Q4: Can this calculator be used for other liquids?
A: Yes, but you need to use the appropriate physical properties (L and ρ) for the specific liquid.

Q5: What is the significance of surface area in evaporation?
A: Larger surface areas increase evaporation rate by providing more interface for phase change to occur.