The temperature rise inside a sealed cabinet without forced ventilation can be approximated as follows.
First calculate the surface area of the enclosure and, from the expected heat load and the surface area, determine the heat input power in
watts/ft.2
Then the expected temperature rise can be read from the Sealed Enclosure Temperature Rise graph. Find where the input power
intersects the line for the enclosure material and read the approximate expected temperature rise at the left.
example:
What is the temperature rise that can be expected from a 48 x 36 x 16 in. painted steel enclosure with 300 W of heat dissipated within it?
solution:
Surface Area = 2[(48 x 36) + (48 x 16) + (36 x 16)] ÷ 144 = 42 ft.2
Input Power = 300 ÷ 42= 7.1 W/ft.2
From the Sealed Enclosure Temperature Rise graph:
Temperature Rise = approximately 30 F (16.7
0 comments:
Post a Comment