1. What is a Cooling Tower Sizing Calculator?

Definition: This calculator estimates the required cooling tower capacity in gallons per minute (gpm) based on heat load and temperature range.

Purpose: It helps HVAC engineers and facility managers determine the appropriate cooling tower size for their systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Capacity — Cooling tower capacity (gallons per minute)
• Q — Heat load (BTU per hour)
• Range — Temperature difference between inlet and outlet water (°F)

Explanation: The formula converts heat rejection requirements into water flow rate needed for proper cooling.

3. Importance of Proper Cooling Tower Sizing

Details: Correct sizing ensures efficient heat rejection, prevents system overload, and maintains optimal energy efficiency.

4. Using the Calculator

Tips: Enter the total heat load in BTU/h and the desired temperature range in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does the 500 constant represent?
A: It's the conversion factor accounting for water's specific heat (500 BTU/hour per gpm per °F).

Q2: How do I determine my heat load (Q)?
A: Calculate from chiller capacity or sum all heat sources in the system.

Q3: What's a typical range for cooling towers?
A: Common ranges are 10-20°F, but this depends on system requirements.

Q4: Should I add a safety factor?
A: Yes, most designers add 10-20% to the calculated capacity for safety margins.

Q5: Does this work for all cooling tower types?
A: The basic calculation applies to most types, but specific designs may require adjustments.