- 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[(48×36) + (48×16) + (36×16)] divided by 144 =
42 square feet
Input Power = 300/42 = 7.1 Watts/SqFt.
From Curve: Temp. Rise = 30Â°F (16.7Â°C)