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Mixed convection cooling in an enclosure with different inlet and outlet configurations

Kim Goethals (UGent) , Marc Delghust (UGent) and Arnold Janssens (UGent)
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Abstract
Given the large impact of the building sector on the final energy demand, special interest lays in passive cooling techniques, such as night ventilation. In practice, however, architects and engineers still hesitate to implement night ventilation as no apt tools are available to model the case-specific coupling between the air and the building – i.e. the Achilles’ heel of night ventilation. Therefore, the authors of this paper aim to advance the modelling by providing a detailed insight in the impact of air flow patterns on the convective heat transfer. Based on the two-dimensional Annex 20 test case, the paper discusses five different configurations of inlet and outlet while varying the temperature difference between warm surfaces and the incoming cool air. In addition, the location of the warm surface(s) is(are) varied. From the CFD simulations, the following conclusions can be withdrawn. First of all, for small temperature differences, locating the inlet near the warm surface obviously results in the highest convective heat transfer. Secondly, as temperature differences increase, presumably wellperforming configurations might show poor results. Given these observations, further research is regarded necessary to be able to withdraw design guidelines and/or advance the convective heat transfer modelling.
Keywords
outlet, inlet, configuration, IEA Annex 20, computational fluid dynamics, cooling, convection

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Citation

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Chicago
Goethals, Kim, Marc Delghust, and Arnold Janssens. 2010. “Mixed Convection Cooling in an Enclosure with Different Inlet and Outlet Configurations.” In 5th International BUILDAIR-symposium on Building and Ductwork Air-tightness, Proceedings. Copenhagen, Denmark: Energie + Umwelt Zentrum.
APA
Goethals, Kim, Delghust, M., & Janssens, A. (2010). Mixed convection cooling in an enclosure with different inlet and outlet configurations. 5th international BUILDAIR-symposium on building and ductwork air-tightness, Proceedings. Presented at the 5th International BUILDAIR-Symposium on Building and Ductwork Air-tightness, Copenhagen, Denmark: Energie + Umwelt Zentrum.
Vancouver
1.
Goethals K, Delghust M, Janssens A. Mixed convection cooling in an enclosure with different inlet and outlet configurations. 5th international BUILDAIR-symposium on building and ductwork air-tightness, Proceedings. Copenhagen, Denmark: Energie + Umwelt Zentrum; 2010.
MLA
Goethals, Kim, Marc Delghust, and Arnold Janssens. “Mixed Convection Cooling in an Enclosure with Different Inlet and Outlet Configurations.” 5th International BUILDAIR-symposium on Building and Ductwork Air-tightness, Proceedings. Copenhagen, Denmark: Energie + Umwelt Zentrum, 2010. Print.
@inproceedings{1231843,
  abstract     = {Given the large impact of the building sector on the final energy demand, special interest lays in passive cooling techniques, such as night ventilation. In practice, however, architects and engineers still hesitate to implement night ventilation as no apt tools are available to model the case-specific coupling between the air and the building -- i.e. the Achilles{\textquoteright} heel of night ventilation. Therefore, the authors of this paper aim to advance the modelling by providing a detailed insight in the impact of air flow patterns on the convective heat transfer. Based on the two-dimensional Annex 20 test case, the paper discusses five different configurations of inlet and outlet while varying the temperature difference between warm surfaces and the incoming cool air. In addition, the location of the warm surface(s) is(are) varied. From the CFD simulations, the following conclusions can be withdrawn. First of all, for small temperature differences, locating the inlet near the warm surface obviously results in the highest convective heat transfer. Secondly, as temperature differences increase, presumably wellperforming configurations might show poor results. Given these observations, further research is regarded necessary to be  able to withdraw design guidelines and/or advance the convective heat transfer modelling.},
  author       = {Goethals, Kim and Delghust, Marc and Janssens, Arnold},
  booktitle    = {5th international BUILDAIR-symposium on building and ductwork air-tightness, Proceedings},
  keyword      = {outlet,inlet,configuration,IEA Annex 20,computational fluid dynamics,cooling,convection},
  language     = {eng},
  location     = {Copenhagen, Denmark},
  pages        = {8},
  publisher    = {Energie + Umwelt Zentrum},
  title        = {Mixed convection cooling in an enclosure with different inlet and outlet configurations},
  year         = {2010},
}