Engineering tools
Control Panel Heat Calculator
Calculate component heat losses, assess the natural heat-dissipation capacity of a control-panel enclosure and estimate the airflow required where forced ventilation is needed.
Build a traceable heat-loss schedule, configure the enclosure dimensions, material and installation arrangement, and produce a calculation report for engineering review.
All calculations run locally in the browser. Calculation data is not uploaded to a server.
Project and document information
Calculation engine: CP-heat v1.0
Calculation summary
Connected, diversified and allowance losses are derived from trusted included rows.
Component heat-loss schedule
Enter maximum manufacturer heat losses. Invalid and excluded rows do not contribute to trusted totals.
| ID | Qty | Manufacturer | Part number | Description | Max temp °C | Unit loss W | Diversity | Connected W | Diversified W | Included | Actions |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 12 | ||||||||||
| 4.5 | 4.5 | ||||||||||
| 0.42 | 0.42 | ||||||||||
| 0.315 | 0.315 | ||||||||||
| 0.21 | 0.21 |
Allowances and additional losses
Diversity is applied once. Detailed conductor-loss entry is deferred; enter its calculated total here.
Terminal 0.1682 W · Cabling 0.1682 W
Enclosure and environment
Material coefficients are workbook/project assumptions, not certified universal values.
Enclosure preview
Normalized isometric preview of enclosure proportions and installation constraints.
Against a wallAmbient 26.0 °C
Internal 31.5 °C · Pass — natural cooling
Painted Carbon Steel enclosure, 400 mm wide, 500 mm high and 210 mm deep. Against a wall. Ambient 26.0 °C, predicted internal 31.5 °C. Pass — natural cooling.
Natural cooling results
Natural heat dissipation is based on effective surface area, coefficient and allowable temperature rise.
Forced ventilation
Airflow is an idealized minimum estimate; allow for filters, pressure loss, derating and real fan curves.
Natural cooling is adequate; forced ventilation is not required.
Warnings and review items
Resolve errors before relying on trusted totals.
No calculation warnings.
Calculation report
Preview the immutable engineering report before opening the browser print dialog.
About the calculation
The calculator totals diversified component heat losses, applies terminal and cabling allowances once, adds manually calculated conductor or other internal losses, and compares the result with the estimated natural heat-dissipation capacity of the enclosure.
Natural cooling and fan airflow
Natural temperature rise is estimated from panel dissipation, the selected material coefficient and effective exposed surface area. Where the resulting heat exceeds the permitted natural capacity, the calculator estimates an idealized minimum ventilation airflow and checks a selected fan duty.
Engineering limitation
This is an engineering thermal estimate based on the supplied calculation workbook. It is not a complete IEC TR 60890 or IEC 61439 temperature-rise verification.
Final design must consider manufacturer derating, local hot spots, air paths, filter pressure loss, solar gain, cable and busbar losses, altitude, contamination, maintenance requirements and applicable project standards.