Cooling Tower Efficiency Calculation Formula

Cooling Tower Efficiency Formula:

\[ E = \frac{T_{in} - T_{out}}{T_{in} - T_{wb}} \]

Cooling Tower Efficiency:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Cooling Tower Efficiency?

Definition: Cooling tower efficiency measures how effectively the tower transfers heat from the water to the atmosphere compared to the maximum possible heat transfer.

Purpose: It helps HVAC professionals and engineers evaluate cooling tower performance and identify potential issues.

2. How Does the Efficiency Calculation Work?

The calculator uses the formula:

\[ E = \frac{T_{in} - T_{out}}{T_{in} - T_{wb}} \]

Where:

\( E \) — Cooling tower efficiency (factor)
\( T_{in} \) — Hot water inlet temperature (°F)
\( T_{out} \) — Cooled water outlet temperature (°F)
\( T_{wb} \) — Ambient wet-bulb temperature (°F)

Explanation: The formula compares the actual temperature drop to the maximum possible temperature drop (approach to wet-bulb).

3. Importance of Efficiency Calculation

Details: Monitoring efficiency helps optimize energy use, maintain system performance, and schedule maintenance when needed.

4. Using the Calculator

Tips: Enter all temperatures in °F. T_in must be greater than T_wb for valid results. Efficiency is displayed as both a factor and percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is a good efficiency value?
A: Typical values range from 60-75%. Higher values indicate better performance.

Q2: Why use wet-bulb temperature?
A: Wet-bulb represents the lowest possible cooling temperature under current atmospheric conditions.

Q3: How often should efficiency be calculated?
A: Regular monitoring (weekly/monthly) helps track performance trends and detect issues early.

Q4: What affects cooling tower efficiency?
A: Factors include air flow, water flow, fill condition, ambient conditions, and maintenance quality.

Q5: Can efficiency exceed 100%?
A: No, 100% would mean outlet water reaches wet-bulb temperature, which is theoretically impossible.