Heat Dissipation in Electrical Enclosures
- Determine input power in watts per square feet by dividing the heat dissipated in the enclosure (in watts) by the enclosure surface area (in square feet).
- Locate on the graph the appropriate input power on the horizontal axis and draw a line vertically until it intersects the temperature rise curve.
- Read horizontally to determine the enclosure temperature rise
What is the temperature rise that can be expected from a 48" x 36" x 16" enclosure with 300 watts of heat dissipated within it?
Surface Area = 2[(48x36) + (48x16) + (36x16)] divided by 144 = 42 square feet
Input Power = 300/42 = 7.1 Watts/SqFt.
From Curve: Temp. Rise = 30°F (16.7°C)