1. What is Water Evaporation Rate?

The water evaporation rate calculation estimates the mass of water evaporating from a surface per unit time. It's essential in various fields including HVAC, meteorology, industrial processes, and environmental engineering.

2. How Does the Calculator Work?

The calculator uses the evaporation rate formula:

Where:

• \( V \) — Wind speed (meters per second)
• \( SA \) — Surface area (square meters)
• \( Xs \) — Saturation humidity ratio (kg water/kg dry air)
• \( X \) — Actual humidity ratio (kg water/kg dry air)

Explanation: The formula accounts for both convective and diffusive evaporation processes, with wind speed enhancing evaporation and humidity difference driving the process.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate calculation is crucial for designing cooling systems, predicting water loss from reservoirs, industrial drying processes, and environmental impact assessments.

4. Using the Calculator

Tips: Enter wind speed in m/s, surface area in m², and humidity ratios in kg/kg. Ensure Xs > X for valid evaporation calculation. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect evaporation rate?
A: Temperature, humidity, wind speed, surface area, and air pressure all influence evaporation rates.

Q2: How accurate is this formula?
A: This empirical formula provides reasonable estimates for most engineering applications but may need adjustment for specific conditions.

Q3: What are typical values for humidity ratios?
A: At 25°C, saturation humidity ratio is about 0.02 kg/kg. Actual ratios vary with relative humidity.

Q4: When is this calculation most useful?
A: Particularly valuable for swimming pool evaporation, cooling tower design, and agricultural water management.

Q5: Are there limitations to this equation?
A: Less accurate for very high wind speeds, extreme temperatures, or when temperature gradients are significant.