1. What is the Boiling Water Evaporation Rate?

The boiling water evaporation rate calculates the mass of water evaporating per unit area per hour from a water surface. This empirical formula accounts for wind speed effects on evaporation, providing practical estimates for industrial and environmental applications.

2. How Does the Calculator Work?

The calculator uses the empirical evaporation equation:

Where:

• \( Evap\ Rate \) — Evaporation rate (kg/m²h)
• \( v \) — Wind speed (m/s)
• \( S \) — Surface area (m²)
• \( 25 + 19v \) — Empirical factor accounting for wind effects

Explanation: The equation models how wind speed accelerates evaporation by removing saturated air from the water surface, allowing more water molecules to escape into the atmosphere.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate estimation is crucial for water resource management, cooling system design, industrial process planning, and environmental impact assessments.

4. Using the Calculator

Tips: Enter wind speed in meters per second and surface area in square meters. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why does wind speed affect evaporation rate?
A: Wind removes the saturated air layer above the water surface, reducing humidity and allowing more water molecules to evaporate into the drier air.

Q2: What are typical evaporation rates for boiling water?
A: Under calm conditions (v=0 m/s), evaporation rate is approximately 25 kg/m²h. With wind speeds of 5 m/s, this can increase to around 120 kg/m²h.

Q3: Does this formula account for temperature variations?
A: This empirical formula is specifically designed for boiling water conditions where temperature is constant at 100°C. For other temperatures, different formulas apply.

Q4: What are the limitations of this empirical formula?
A: The formula provides approximate values and may not account for humidity, atmospheric pressure, or container geometry effects on evaporation.

Q5: How accurate is this calculation for industrial applications?
A: For preliminary design and estimation purposes, this formula provides reasonable accuracy. For critical applications, experimental validation is recommended.