1. What is the Water Evaporation Rate Equation?

The Water Evaporation Rate equation calculates the rate at which water evaporates from a surface based on wind speed, surface area, and humidity differences. This is particularly useful in environmental engineering, HVAC systems, and industrial processes.

2. How Does the Calculator Work?

The calculator uses the evaporation rate equation:

Where:

• \( ER \) — Evaporation rate (kg per hour)
• \( V \) — Wind speed (meters per second)
• \( A \) — Surface area (square meters)
• \( Xs \) — Saturation humidity ratio (kg/kg)
• \( X \) — Actual humidity ratio (kg/kg)

Explanation: The equation accounts for both convective and diffusive evaporation processes, with wind speed significantly influencing the evaporation rate.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate calculation is crucial for water resource management, cooling system design, agricultural planning, 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. All values must be valid (non-negative, with area > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is humidity ratio?
A: Humidity ratio is the mass of water vapor per unit mass of dry air, typically expressed in kg/kg.

Q2: How does wind speed affect evaporation?
A: Higher wind speeds increase evaporation by removing moist air from the surface and replacing it with drier air.

Q3: What is saturation humidity ratio?
A: The maximum amount of water vapor air can hold at a given temperature and pressure.

Q4: When is this equation most accurate?
A: This empirical equation works well for natural water surfaces under moderate environmental conditions.

Q5: Can this be used for other liquids?
A: The equation is specifically calibrated for water. Other liquids would require different coefficients.