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Thermal Analysis of the necessity of A CPU Heat sink fan

This study analyzes the necessity of a CPU heat sink fan in keeping the CPU at a safe operating temperature. Experimental measurements and theoretical calculations are compared to determine the required air velocity for forced convection cooling. The findings suggest that forced convection through a heat sink is necessary for effective CPU cooling.

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Thermal Analysis of the necessity of A CPU Heat sink fan

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  1. Shaun Heldt and Tyler Merrell Thermal Analysis of the necessity of A CPU Heat sink fan

  2. Background • Most common type of cooling method • Keeps CPU at a safe operating temperature • Has fan to improve overall heat transfer of fins by introducing forced convection.

  3. Materials • 1 Intel I7-26000K Processor heat sink • 1 Fluke 51 Thermometer with K-thermocouple • 1 Soldering Iron • 1 Hot Glue Gun

  4. Experiment • Used glue gun and soldering iron to simulate a hot CPU • Measured temperature of the center of the heat sink and the fin tip while heating • Measured time to cool after heated • Compared with theoretical calculations to solve for Qout and the required air velocity for forced convection

  5. Data

  6. Natural Convection • Solve for Qout from natural convection of the heat sink to find if cooling due to natural convection is sufficient for cooling CPUs • Note: Qin from CPU equals 80W • Therefore, Qout must be greater than or equal to 80W for natural convection to be sufficient

  7. Natural Convection

  8. Thermal Circuit

  9. Compiled Calculations Qout= 6.77W Therefore, natural convection is not sufficient

  10. Forced Convection • Used forced convection calculations to solve for required airspeed from fans to have a Qout = 80W • Using previous calculations, an h value of 143.138 W/m2 would be required to sufficiently cool the CPU • Using Hilpert’s equation for cross flow of a square geometry and thermophysical properties we found that the required airspeed velocity is 2.913 m/s

  11. Conclusion • Approximations were made to form the model used in calculating the presented values, however, we believe that this model was a reasonable approximation of the system. • We found that forced convection through a heat sink is necessary in CPU cooling

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