1. What is a Cooling Tower Capacity Calculator?

Definition: This calculator determines the water circulation capacity needed for a cooling tower based on heat rejection and temperature range.

Purpose: It helps HVAC engineers and facility managers properly size cooling towers for efficient heat dissipation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( C \) — Capacity (gallons per minute)
• \( H \) — Heat rejection (BTU per hour)
• \( R \) — Temperature range (°F)
• 500 — Constant (BTU/min per gpm per °F)

Explanation: The heat rejection is divided by the product of temperature range and the constant 500 to determine required water flow rate.

3. Importance of Cooling Tower Capacity Calculation

Details: Proper capacity calculation ensures efficient cooling system operation, prevents overheating, and optimizes energy usage.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the 500 constant in the formula?
A: It represents the heat transfer capacity of water (500 BTU/min per gpm per °F).

Q2: How do I determine heat rejection?
A: Heat rejection equals the chiller capacity plus the compressor work (typically 1.25-1.3 × chiller capacity).

Q3: What's a typical range for cooling towers?
A: Most systems operate with a 10-15°F range, but this varies based on system design.

Q4: Does this account for system losses?
A: No, consider adding 10-15% to the calculated capacity for safety margin.

Q5: Can I use this for other fluids?
A: No, this is specifically for water. Other fluids have different heat capacities.