1. What is a Swimming Pool Heat Pump Size Calculator?

Definition: This calculator estimates the required heat pump size (in BTU) for a swimming pool based on water mass, temperature difference, and heat loss factors.

Purpose: It helps pool owners and professionals determine the appropriate heat pump capacity to efficiently maintain desired water temperatures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total heat requirement (BTU)
• \( m \) — Mass of water (pounds)
• \( c \) — Specific heat capacity of water (1.0 BTU/lb·°F)
• \( \Delta T \) — Desired temperature increase (°F)
• \( Q_{\text{latent}} \) — Additional heat loss (evaporation, wind, etc.)

Explanation: The formula calculates the sensible heat needed to raise the water temperature plus any additional latent heat loss.

3. Importance of Proper Heat Pump Sizing

Details: Correct sizing ensures energy efficiency, proper temperature maintenance, and avoids overworking the heat pump.

4. Using the Calculator

Tips: Enter the pool water mass in pounds, specific heat capacity (default 1.0 for water), desired temperature difference, and any additional heat loss factors.

5. Frequently Asked Questions (FAQ)

Q1: How do I calculate pool water mass?
A: Multiply pool volume (gallons) by 8.34 lb/gal. For example, 10,000 gallons × 8.34 = 83,400 lb.

Q2: What's a typical temperature difference?
A: This depends on your climate and desired temperature. Common ΔT values range from 10-20°F.

Q3: What should I include in latent heat?
A: Consider evaporation (typically 100-300 BTU/ft²/day), wind exposure, and nighttime heat loss.

Q4: How does this relate to heat pump tonnage?
A: 12,000 BTU = 1 ton. Divide your result by 12,000 to get required tonnage.

Q5: Should I add a safety factor?
A: Yes, consider adding 10-20% to the calculated BTU requirement for optimal performance.