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Chimney effect on natural convection cooling of electronic components

(2008) p.1-6
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Abstract
The thermal impedance Zth (j*omega) 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 5cm and various heights H ranging from 20 to 60cm. 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 Delta Rth could be reduced by more than 15%. We also propose a simple hydraulic model for the chimney. The theoretical analysis predicts that 1/Delta Rth is proportional to H^1/4 . The experimental results agree quite well with this tendency.
Keywords
thermal impedance, dynamic analysis, chimney effect, natural convection, hydraulic model

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Chicago
Vermeersch, Bjorn, Gilbert De Mey, M. Wojcik, J. Pilarski, M. Lasota, Jedrzej Banaszczyk, Andrzej Napieralski, and Michel De Paepe. 2008. “Chimney Effect on Natural Convection Cooling of Electronic Components.” In , 1–6.
APA
Vermeersch, B., De Mey, G., Wojcik, M., Pilarski, J., Lasota, M., Banaszczyk, J., Napieralski, A., et al. (2008). Chimney effect on natural convection cooling of electronic components (pp. 1–6). Presented at the IMAPS Advanced Technology Workshop on Thermal Management.
Vancouver
1.
Vermeersch B, De Mey G, Wojcik M, Pilarski J, Lasota M, Banaszczyk J, et al. Chimney effect on natural convection cooling of electronic components. 2008. p. 1–6.
MLA
Vermeersch, Bjorn, Gilbert De Mey, M. Wojcik, et al. “Chimney Effect on Natural Convection Cooling of Electronic Components.” 2008. 1–6. Print.
@inproceedings{678483,
  abstract     = {The thermal impedance Zth (j*omega) 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 5cm and various heights H ranging from 20 to 60cm. 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 Delta Rth could be reduced by more than 15\%. We also propose a simple hydraulic model for the chimney. The theoretical analysis predicts that 1/Delta Rth is proportional to H\^{ }1/4 . The experimental results agree quite well with this tendency.},
  author       = {Vermeersch, Bjorn and De Mey, Gilbert and Wojcik, M. and Pilarski, J. and Lasota, M. and Banaszczyk, Jedrzej and Napieralski, Andrzej and De Paepe, Michel},
  keyword      = {thermal impedance,dynamic analysis,chimney effect,natural convection,hydraulic model},
  language     = {eng},
  location     = {Palo Alto, CA (USA)},
  pages        = {1--6},
  title        = {Chimney effect on natural convection cooling of electronic components},
  year         = {2008},
}