1. What is the Pool Evaporation Equation?

The pool evaporation equation estimates the daily water loss from a swimming pool due to evaporation. It considers wind speed, pool surface area, and the difference between water and air vapor pressures.

2. How Does the Calculator Work?

The calculator uses the pool evaporation equation:

Where:

• \( E \) — Evaporation rate (m³/day)
• \( W \) — Wind speed at pool surface (m/s)
• \( A \) — Pool surface area (m²)
• \( P_w \) — Water vapor pressure at water temperature (Pa)
• \( P_a \) — Air vapor pressure at dew point (Pa)

Explanation: The equation accounts for both natural convection (0.0001 term) and wind-induced evaporation (0.00005 term).

3. Importance of Evaporation Rate Calculation

Details: Understanding evaporation rates helps in water conservation planning, chemical treatment adjustments, and heating cost estimations for pools.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What factors increase pool evaporation?
A: High wind speeds, large surface area, high water temperature, low humidity, and lack of pool covers all increase evaporation.

Q2: How accurate is this equation?
A: It provides reasonable estimates for typical outdoor pools but may be less accurate for indoor pools or unusual conditions.

Q3: How can I reduce pool evaporation?
A: Use pool covers when not in use, reduce wind exposure with barriers, and maintain lower water temperatures when possible.

Q4: What's a typical evaporation rate?
A: Typically 2-5 mm/day in moderate climates, but can exceed 10 mm/day in hot, dry, windy conditions.

Q5: How does evaporation affect pool chemistry?
A: Evaporation concentrates chemicals in the water, requiring periodic dilution with fresh water to maintain balance.