# Air at 20°C and 101 kPa enters a passage betweenP4-36two printed circuit boards inside a desktop computer. Oneboard contains nine chips each dissipating 2 W and five chipseach dissipating 1.3 W. No heat enters the passage from theother card. If the exit temperature is 28.5°C, find the volumetric flow rate of the air. Neglect kinetic and potential energychanges

Question
Asked Nov 6, 2019
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Step 1

1. Specific heat is taken as constant.
2. The system operates in a steady state.
3. Frictional heating in the fluid is neglected.
4. As mentioned, neglect potential and kinetic energy.
5. No heat is conducted into the card.

The given system is an open system. Apply first law for open system.

Step 2

Thus, the above equation can be written in the form of constant specific heat as,

Step 3

Find the value of avera...

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EngineeringMechanical Engineering