AHU CFM to TR Calculator Guide
Convert airflow (CFM) into cooling capacity (TR) quickly and accurately. This AHU CFM to TR calculator helps engineers, HVAC technicians, and beginners size systems with ease. Use this simple guide to understand calculations, formulas, and real-world applications.
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CFM to TR Converter Guide
How to Use AHU CFM to TR Calculator Guide
Follow these simple steps to use the AHU CFM to TR calculator:
- Enter Airflow (CFM): Input the airflow value in cubic feet per minute (CFM). You can find this value from AHU specifications or duct design.
- Enter Temperature Difference (ΔT): Input the temperature difference between return air and supply air. Typical value ranges from 16°F to 22°F.
- Apply the Formula: The calculator uses a standard HVAC formula to convert CFM to TR.
- Get Instant Result: The tool displays the cooling capacity in Tons of Refrigeration (TR).
- Adjust Inputs if Needed: Modify CFM or ΔT to see how capacity changes.
Conversion / Calculation Guide
Formula to Convert AHU CFM to TR
Where:
- CFM = Airflow (Cubic Feet per Minute)
- ΔT = Temperature Difference (°F)
- 1.08 = Air constant
- 12000 = BTU/hr per Ton
Step-by-Step Example
Example:
CFM = 4000
ΔT = 20°F
Step 1: Multiply CFM and ΔT
4000 × 20 = 80,000
Step 2: Multiply by air constant
80,000 × 1.08 = 86,400
Step 3: Divide by 12,000
86,400 ÷ 12,000 = 7.2 TR
Final Answer: Cooling capacity = 7.2 TR
AHU CFM to TR Conversion Chart Guide
Approximate values (ΔT = 20°F)
| CFM | TR |
|---|---|
| 400 | 0.72 |
| 800 | 1.44 |
| 1200 | 2.16 |
| 1600 | 2.88 |
| 2000 | 3.60 |
| 3000 | 5.40 |
| 4000 | 7.20 |
| 5000 | 9.00 |
| 6000 | 10.80 |
| 8000 | 14.40 |
| 10000 | 18.00 |
Note: Values may vary based on actual temperature difference and system conditions.
FAQs – AHU CFM to TR Calculator Guide
It is a tool that converts airflow (CFM) into cooling capacity (TR) using a standard HVAC formula.
ΔT represents the temperature difference. It directly affects cooling capacity. Higher ΔT increases TR.
Most systems use 18°F to 20°F. However, actual values depend on design conditions.
Yes, you can use it for most air conditioning and ventilation systems using airflow-based cooling.
Cooling capacity (TR) increases proportionally with airflow.
It provides a quick estimate. For precise design, include humidity, load calculations, and system losses.
Proper airflow ensures efficient heat removal. Low airflow reduces cooling efficiency.