1. What is Cooling Tower Capacity?

Definition: This calculator determines the heat rejection capacity of a cooling tower based on water flow rate, temperature difference, and latent heat.

Purpose: It helps HVAC engineers and facility managers properly size cooling towers for various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total cooling capacity (BTU)
• \( m \) — Mass flow rate of water (lb)
• \( c \) — Specific heat of water (1.0 BTU/lb·°F)
• \( \Delta T \) — Temperature difference (°F)
• \( Q_{latent} \) — Latent heat from evaporation (BTU)

Explanation: The formula calculates both sensible heat (from temperature change) and latent heat (from evaporation).

3. Importance of Cooling Tower Capacity

Details: Proper capacity calculation ensures efficient heat rejection, prevents system overload, and maintains optimal process temperatures.

4. Using the Calculator

Tips: Enter water mass flow rate, specific heat (default 1.0 for water), temperature difference, and optional latent heat. All main values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical specific heat for water?
A: Water's specific heat is approximately 1.0 BTU/lb·°F, but can vary slightly with temperature and impurities.

Q2: How do I determine the temperature difference?
A: Measure the difference between entering and leaving water temperatures at the cooling tower.

Q3: When should I include latent heat?
A: Include latent heat when significant evaporation occurs (typically 1-2% of circulating water flow).

Q4: How do I convert GPM to lb/hr?
A: Multiply GPM by 500 (for water: 1 GPM ≈ 500 lb/hr at 60°F).

Q5: What's a typical approach temperature?
A: Most cooling towers operate with a 7-15°F approach to wet bulb temperature.