Comprehensive Guide to Cooling Coil Sizing and Physics
Cooling coil sizing is an essential engineering procedure in heating, ventilation, and air conditioning system design. Proper sizing ensures optimal thermal comfort, precise moisture removal, and energy efficiency. When air flows across a cooling coil, both sensible heat (lowering dry-bulb temperature) and latent heat (condensing water vapor) are extracted from the air stream.
Formulas Used in the Calculation
The calculations performed by this tool rely on fundamental principles of thermodynamics and psychrometrics:
- Total Heat (BTU/hr): $Q_{tot} = 4.5 \times \text{CFM} \times (h_{in} - h_{out})$
- Sensible Heat (BTU/hr): $Q_{sens} = 1.08 \times \text{CFM} \times (T_{in,db} - T_{out,db})$
- Latent Heat (BTU/hr): $Q_{lat} = Q_{tot} - Q_{sens}$
- Sensible Heat Ratio (SHR): $SHR = \frac{Q_{sens}}{Q_{tot}}$
- Face Area (sq. ft): $\text{Face Area} = \frac{\text{Airflow (CFM)}}{\text{Face Velocity (FPM)}}$
How to Use This Calculator
Using this advanced physics tool is straightforward. Simply input your specific system parameters categorized into three clear sections: Airflow and environmental data, entering air state properties, and desired leaving air conditions. Click the calculate button to immediately review detailed thermal outputs, heat breakdown loads, and total refrigeration tonnage requirements.