1. What is the Pool Evaporation Rate Equation?

The pool evaporation rate equation estimates the amount of water lost from a swimming pool due to evaporation. It considers factors like wind speed, pool surface area, and the difference between water and air vapor pressures.

2. How Does the Calculator Work?

The calculator uses the evaporation rate equation:

Where:

• \( E \) — Evaporation rate (L/h)
• \( W \) — Wind speed (km/h)
• \( A \) — Pool surface area (m²)
• \( P_w \) — Water vapor pressure (Pa)
• \( P_a \) — Air vapor pressure (Pa)

Explanation: The equation accounts for both natural convection (29 term) and wind-induced evaporation (0.35W term), multiplied by the surface area and vapor pressure difference.

3. Importance of Evaporation Rate Calculation

Details: Calculating evaporation rate helps in water conservation planning, chemical treatment adjustments, and understanding water loss in swimming pools and other water bodies.

4. Using the Calculator

Tips: Enter wind speed in km/h, pool area in m², and vapor pressures in Pascals. All values must be valid (non-negative, with area > 0).

5. Frequently Asked Questions (FAQ)

Q1: What factors affect pool evaporation most?
A: The primary factors are wind speed, surface area, water temperature, air temperature, and humidity.

Q2: How can I reduce pool evaporation?
A: Using pool covers, windbreaks, and maintaining lower water temperatures can significantly reduce evaporation.

Q3: What are typical evaporation rates for pools?
A: Typical rates range from 2-5 mm/day (0.08-0.2 inches/day) but vary greatly with environmental conditions.

Q4: How does humidity affect evaporation?
A: Higher humidity (smaller Pw-Pa difference) reduces evaporation, while dry air increases it.

Q5: Is this equation suitable for all water bodies?
A: It works best for swimming pools. Larger bodies of water may require more complex models.