A 0.15 m square circuit board is to be cooled in a vertical position as shown. The board is insulated on one side while on the other, 100 closely spaced square chips are mounted, each of which dissipated 0.06 W of heat. The board is exposed to air at 25?C and the maximum allowable chip temperature is 60?C. Investigate the following cooling options(a) Natural convection(b) Air cooling with upward flow at a velocity of 0.5 m/s(c) Air cooling with downward flow at the same velocity as (b)GIVENSquare vertical circuit board insulated on one side, chips on the other sideLength of each side (L) = 0.15 mHeat dissipation per chip (q) = 0.06 WNumber of chips (N) = 100Ambient air temperature (T??) = 25?CMaximum allowable chip temperature (Ts) = 60?CASSUMPTIONSSteady stateUniform surface temperatureRadiative heat transfer isnegligible

Transcribed Image Text:

Insulation Chips Alr T= 25°C To-60°C Max -L=0.15 m