EXTRUSIONS > FORCED
AIR COOLING > Correction Graph
Some thermal performance
figures shown in this catalogue are given for natural
air convection cooling. For forced air cooling the above
graph may be used to obtain the relevant correction factor
against a known air velocity.
e.g.
The thermal resistance is 0.37deg/watt. Assuming this
heat sink is placed in an air velocity of 2.0 m/s then
0.37x0.435 becomes 0.16 deg/watt approx.
To convert a known cfm to
m/s for a particular heat sink, the following
equation may be used :
m/s =
471
cfm
-------------------
NHW
where: m/s = metres
per second
cfm = cubic feet per minute
N = number of channels
H = channel height (mm)
W = channel width (mm)
