1. What is a Cooling Coil Capacity Calculator?

Definition: This calculator estimates the cooling capacity of a coil based on water flow rate and temperature difference.

Purpose: It helps HVAC professionals and engineers determine the thermal performance of cooling coils in various systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Capacity — Cooling capacity (BTU/h)
• Flow — Water flow rate (gallons per minute)
• ΔT — Temperature difference between supply and return (°F)
• 500 — Constant for water (8.33 lb/gal × 60 min/h × 1 BTU/lb-°F)

Explanation: The formula calculates the heat transfer rate based on water flow and temperature change.

3. Importance of Cooling Coil Capacity Calculation

Details: Proper capacity estimation ensures adequate cooling performance, energy efficiency, and proper system sizing.

4. Using the Calculator

Tips: Enter the water flow rate in gpm and temperature difference in °F. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 500 used?
A: It combines water density (8.33 lb/gal), time conversion (60 min/h), and specific heat (1 BTU/lb-°F).

Q2: What's a typical ΔT for chilled water systems?
A: Most systems are designed for 10-20°F ΔT, with 12°F being common.

Q3: Does this work for other fluids?
A: No, this is specific to water. For glycol mixtures, use appropriate specific heat values.

Q4: How accurate is this calculation?
A: It provides theoretical maximum capacity. Actual performance depends on coil design and airside conditions.

Q5: What if I need capacity in tons?
A: Divide BTU/h by 12,000 to convert to refrigeration tons.