1. What is the GPM to TR Conversion Formula?

The GPM to TR (Tons of Refrigeration) conversion formula calculates the cooling capacity from water flow rate and temperature difference. It is commonly used in HVAC and refrigeration systems to determine system capacity.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

• \( TR \) — Tons of Refrigeration
• \( GPM \) — Flow rate in gallons per minute
• \( \Delta T \) — Temperature difference in °F

Explanation: The formula converts the heat transfer rate (based on water flow and temperature change) to equivalent tons of refrigeration, where 1 ton of refrigeration = 12,000 BTU/hr.

3. Importance of TR Calculation

Details: Accurate TR calculation is essential for proper sizing of refrigeration systems, chiller selection, and ensuring efficient cooling system operation in various applications.

4. Using the Calculator

Tips: Enter flow rate in GPM and temperature difference in °F. All values must be valid positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a ton of refrigeration?
A: One ton of refrigeration is equal to the cooling effect of melting one ton of ice in 24 hours, equivalent to 12,000 BTU per hour.

Q2: Why is the divisor 24 in the formula?
A: The divisor 24 comes from the conversion factors between GPM, BTU/hr, and tons of refrigeration (1 GPM × 500 × ΔT°F = BTU/hr, then ÷ 12,000 = TR).

Q3: Can this formula be used for any fluid?
A: This specific formula is designed for water. For other fluids, additional factors like specific heat and density must be considered.

Q4: What are typical GPM values for chillers?
A: Typical chiller flow rates range from 2-3 GPM per ton for water-cooled systems and 3-4 GPM per ton for air-cooled systems.

Q5: How does ΔT affect system efficiency?
A: Higher ΔT generally indicates more efficient heat transfer, but extremely high ΔT may indicate flow problems or other system issues.