Plan coil size using airflow, temperatures, and moisture conditions. Compare loads with clear results instantly. Export reports, study formulas, and graph performance trends easily.
The page stays in a single-column flow, while the input controls use a responsive 3-column, 2-column, and 1-column grid.
This sample case uses the default values preloaded in the calculator.
| Airflow | Entering Air | Leaving Air | Evap. Temp | U Value | Total Load | Area with Safety | Estimated Coil Size | Rows |
|---|---|---|---|---|---|---|---|---|
| 8,500.00 m³/h | 30.00 °C / 60.00% | 14.00 °C / 92.00% | 7.00 °C | 55.00 W/m²·K | 89.50 kW | 135.51 m² | 1.23 × 0.77 m | 15 |
W = 0.62198 × Pv / (Patm − Pv)
Here, Pv is the vapor partial pressure from dry bulb temperature and relative humidity.
h = 1.006T + W(2501 + 1.86T)
This estimates moist-air enthalpy in kJ/kg dry air.
Qtotal = ṁdry × (hin − hout)
It gives the evaporator load in kW.
Qsensible = ṁdry × 1.006 × (Tin − Tout)
Latent load equals total load minus sensible load.
LMTD = (ΔT1 − ΔT2) / ln(ΔT1 / ΔT2)
Where ΔT1 = Tin − Tevap and ΔT2 = Tout − Tevap.
A = (Q × 1000) / (U × LMTD)
A safety factor is then added for practical selection.
Aface = V̇ / Face Velocity
This helps estimate frontal dimensions and coil proportions.
Enter the design airflow in cubic meters per hour. Use the project supply air value planned for the evaporator section.
Fill in entering and leaving air dry bulb temperatures and relative humidity values. These conditions define sensible and latent performance.
Enter the evaporating temperature, overall heat transfer coefficient, and design face velocity. These directly affect coil area and frontal size.
Set the safety factor, aspect ratio, surface enhancement factor, and daily operating hours. These improve practical sizing and energy visibility.
Press the calculate button. The results appear immediately below the header and above the form, including graph, summary table, and export options.
It estimates evaporator cooling load, coil area, frontal face area, approximate width and height, coil rows, moisture removal, and daily cooling energy for construction cooling applications.
Humidity affects latent cooling. Without it, the calculator cannot estimate enthalpy change accurately, and total evaporator size may be underestimated.
The U value is the overall heat transfer coefficient. It combines coil, fin, and air-side transfer behavior into one practical sizing input.
A safety factor gives additional coil area beyond the theoretical minimum. It helps cover fouling, selection margins, and real installation conditions.
It is a planning estimate based on required transfer area, face area, and the entered surface enhancement factor. Final manufacturer selection may differ.
Yes. It is useful for retrofit checks, concept design, and quick comparisons. Final procurement should still be confirmed with detailed equipment data.
Check airflow, evaporating temperature, U value, and leaving conditions first. Large loads or small temperature differences can increase required coil area significantly.
Yes. After calculation, both buttons export the summary results. They also include the performance table used for the graph.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.