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Experimental facility for analysis of supported mixed convection on active cooling wall.

Number: pap. n. 121

Author(s) : VENKO S., PAVLOVIC E., MEDVED S.

Summary

Primary energy usage for buildings cooling needs to be reduced in the coming years. This goal can be achieved with a combination of different approaches; one of possibilities with high potential is low exergy cooling based on high temperature environmental sources combined with thermally activated room surfaces. Vertical walls present a major part of the room envelope and can therefore be used for surface cooling. Convective heat transfer on a vertical cooled wall can be enhanced by plane jet of supply air from a diffuser mounted parallel on the top of the wall. A plane jet of air causes mixed convection a with higher convective heat transfer coefficient than that of natural convection. In practice, convective heat transfer of mixed convection has to be known for suitable and effective implementation of the cooling system with enhanced convective heat transfer. This paper presents two approaches for specifying the convective heat transfer coefficient of mixed convection regarding the definition of the temperature difference and it shows the principle of measuring local convective heat transfer using heat flux sensors and a calorimetric method. In this article the whole experimental set-up for measurements of supported mixed convection on a cooled vertical wall is presented and includes many advice and suggestions concerning what requires special care in the design of similar experimental facilities.

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Pages: 10 p.

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Details

  • Original title: Experimental facility for analysis of supported mixed convection on active cooling wall.
  • Record ID : 30008665
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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