The GPM to Tons Calculator is a tool that helps in converting water flow rate into cooling capacity, expressed in refrigeration tons. This type of calculator is commonly used in HVAC systems, industrial processes, and chilled water applications. By knowing the gallons per minute (GPM) of water flow and the temperature difference across the cooling system, you can quickly estimate the cooling performance in tons of refrigeration. This makes it easier for engineers, technicians, and facility managers to size equipment, balance systems, and ensure efficient operation.
formula
Primary Formula: Calculating Cooling Capacity in Tons
Formula
Tons = (GPM * ΔT) / 24
Variable Definitions
Tons: Cooling capacity, expressed in refrigeration tons.
GPM: Water flow rate in gallons per minute.
ΔT: Temperature difference between entering and leaving water, in degrees Fahrenheit.
24: A constant used for conversion that relates water flow, temperature change, and refrigeration tons.
Conversion Table for Quick Reference
Here is a simple table that gives approximate tonnage values for common GPM and ΔT combinations. This table can help you avoid manual calculations for frequently used values.
| GPM (Flow Rate) | ΔT (°F) | Cooling Capacity (Tons) |
|---|---|---|
| 10 | 10 | 4.2 |
| 20 | 10 | 8.3 |
| 30 | 10 | 12.5 |
| 50 | 10 | 20.8 |
| 100 | 10 | 41.7 |
| 50 | 12 | 25.0 |
| 100 | 12 | 50.0 |
This conversion table allows quick checks without repeatedly applying the formula.
Example
Suppose a chilled water system has a flow rate of 60 GPM and a temperature difference (ΔT) of 12°F. To find the cooling capacity in tons:
Tons = (60 * 12) / 24
Tons = 720 / 24
Tons = 30
So, the system provides 30 tons of cooling capacity.
Most Common FAQs
This conversion helps in determining the cooling capacity of a system based on water flow and temperature difference. It is crucial for properly sizing chillers, pumps, and other HVAC equipment.
This formula is specifically for water. For other fluids, you would need to account for their specific heat properties, which are different from water.
The constant 24 comes from unit conversion factors that relate gallons per minute, temperature difference, and refrigeration tons. It simplifies the calculation to give direct results in tons of cooling.