Chimney Effect on Natural Convection Cooling of Electronic Components
نویسندگان
چکیده
The thermal impedance Zth(jω) has been measured for a transistor fixed on a cooling fin. We have put the setup inside a cilindrical chimney with an inner diameter around cm and various heights H ranging from to cm. The enhancement of the natural convection cooling by the chimney is clearly demonstrated by means of Nyquist plots of the thermal impedance. Depending on the insertion distance of the setup into the chimney, the case-to-ambient thermal resistance ∆Rth could be reduced by more than . We also propose a simple hydraulic model for the chimney. The theoretical analysis predicts that 1/∆Rth is proportional to H. The experimental results agree quite well with this tendency.
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Chimney Effect on Natural Convection Cooling of a Transistor Mounted on a Cooling Fin
The thermal impedance Zth j has been measured for the junction of a transistor mounted on a cooling fin. The setup was put inside a chimney in order to enhance the natural convection cooling. From the thermal impedance Zth j the influence of the chimney on the reduction in thermal resistance Rth Zth j 0 is clearly visible. A maximum improvement of almost 20% has been observed experimentally. Me...
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