# Heat Dissipation in Electrical Enclosures #### Selection Procedure:

1. 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).
2. Locate on the graph the appropriate input power on the
horizontal axis and draw a line vertically until it intersects the
temperature rise curve.
3. Read horizontally to determine the enclosure temperature rise

### Example:

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?

### Solution:

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)
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