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# Cooling of Chips in Circuit Boards - PowerPoint PPT Presentation

Cooling of Chips in Circuit Boards Problem One way to cool chips mounted on circuit boards is to encapsulate the boards in metal frames that provide efficient pathways for conduction to supporting cold plates.

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### Cooling of Chips in Circuit Boards

• One way to cool chips mounted on circuit boards is to encapsulate the boards in metal frames that provide efficient pathways for conduction to supporting cold plates.

• Heat Generated by the chips is then dissipated by transfer to water flowing through passages drilled in the plates.

Coolant Passages

water

AIR

Cold Plate

T = 32 Celsius

Circuit Board Frames. T=47 Celsius, N=10

Circuit Board Containing Chips

• Isothermal cold plate

• All heated generated by circuit boards is dissipated by cold plates

• Circuit boards may be represented as isothermal at an average surface temperature.

• Air flow over circuit boards approximates that over a flat plate in parallel flow.

• Part A: To find how much heat is dissipated by the circuit boards

• Part B: To find how much of the heat generated by the circuit boards is transferred to air

With a total of N = 10 passages, the total heat dissipation is

50.2 kW

To find how much of the heat generated by the circuit boards is transferred to air.

2,670W 9.5 percent(low) Heat Transfer to the Air

• Air not effect for Cooling Microchips

• The cooling capacity of the cold plates far exceeds that of the air flow. However, the challenge would be one of efficiently transferring such a large amount of energy to the cold plates without incurring excessive temperatures on the circuit boards