1. What is Cooling Tower Efficiency?

Definition: Cooling tower efficiency measures how effectively the tower transfers heat from water to air, expressed as a percentage.

Purpose: It helps HVAC engineers and facility managers evaluate cooling tower performance and identify maintenance needs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \eta \) — Cooling tower efficiency (%)
• \( \Delta T_{range} \) — Temperature range (°F) = Hot water temp - Cold water temp
• \( \Delta T_{approach} \) — Approach temperature (°F) = Cold water temp - Wet bulb temp

Explanation: The formula compares the actual cooling achieved (range) to the maximum possible cooling (range + approach).

3. Importance of Cooling Tower Efficiency

Details: Higher efficiency means better heat transfer, lower energy costs, and reduced water consumption. Typical efficiency ranges from 60-75%.

4. Using the Calculator

Tips: Enter the temperature range and approach temperature in °F. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a good efficiency for a cooling tower?
A: Most well-maintained towers achieve 60-75% efficiency. Values below 50% indicate potential problems.

Q2: How do I measure the wet bulb temperature?
A: Use a sling psychrometer or electronic wet bulb thermometer at the tower's air inlet.

Q3: Why does approach temperature affect efficiency?
A: Smaller approach temperatures mean the tower is cooling closer to the wet bulb limit, indicating higher efficiency.

Q4: Can efficiency exceed 100%?
A: No, 100% would require approach temperature of 0°F, which is theoretically impossible.

Q5: How often should I check cooling tower efficiency?
A: Monthly checks are recommended, with more frequent monitoring during peak usage periods.