1. What is a Cooling Tower Size Calculator?

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

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:

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

Explanation: The calculator first computes the sensible heat transfer then adds any latent heat from evaporation if provided.

3. Importance of Cooling Tower Sizing

Details: Proper cooling tower sizing ensures efficient heat rejection, prevents system overload, and optimizes energy consumption.

4. Using the Calculator

Tips: Enter water mass flow rate, specific heat (default 1.0 BTU/lb·°F for water), temperature difference, and latent heat (if applicable). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is latent heat in cooling towers?
A: Latent heat represents the energy absorbed during water evaporation, which is a significant part of cooling tower operation.

Q2: How do I convert GPM to lb/hr?
A: Multiply gallons per minute (GPM) by 500 (for water at standard conditions: 1 gallon ≈ 8.33 lb, 60 minutes/hour).

Q3: What's a typical ΔT for cooling towers?
A: Most cooling towers operate with ΔT between 10-30°F, depending on design and application.

Q4: Should I include latent heat in my calculations?
A: For precise sizing, yes. For initial estimates, sensible heat alone may suffice as latent heat is often 70-80% of total.

Q5: How does this relate to cooling tower tons?
A: 1 cooling tower ton = 15,000 BTU/hr. Divide your result by 15,000 to get cooling tower tons.