An experimental study of mixed convection over various thermal activation lengths of vertical TABS

Abstract This paper presents experimental study of supported mixed convection of two-dimensional wall jet over various thermal activation lengths of vertical TABS. It was found out that supported mixed convection upward the jet over vertical TABS is not influenced by thermally inactivated vertical TABS downwards of the wall jet. Practical consequences of this founding were after that tested using TRNSYS simulation tool in energy simulation study for contemporary modern office room having vertical TABS. Results show that office room can be sufficiently cooled by mixed convection even for TABS designs where only upper half of room wall is thermally activated by environmental high temperature cooling sources.

[1]  Chris J. Kobus,et al.  Modeling the local and average heat transfer coefficient for an isothermal vertical flat plate with assisting and opposing combined forced and natural convection , 1996 .

[2]  Hsin Yu,et al.  Scale model study of airflow performance in a ceiling slot-ventilated enclosure: isothermal condition , 2003 .

[3]  Tim Weber,et al.  Validation of a FEM-program (frequency-domain) and a simplified RC-model (time-domain) for thermally activated building component systems (TABS) using measurement data , 2005 .

[4]  Rasmus Lund Jensen,et al.  Experimental investigation of heat transfer during night-time ventilation , 2010 .

[5]  Sašo Medved,et al.  An experimental study of natural and mixed convection over cooled vertical room wall , 2014 .

[6]  Viktor Dorer,et al.  Interaction of an air system with concrete core conditioning , 1999 .

[7]  Jae-Weon Jeong,et al.  Ceiling radiant cooling panel capacity enhanced by mixed convection in mechanically ventilated spaces , 2003 .

[8]  Olli Seppänen,et al.  Experimental investigation and modelling of a buoyant attached plane jet in a room , 2009 .

[9]  Helmut E. Feustel,et al.  Hydronic radiant cooling — preliminary assessment☆ , 1995 .

[10]  Stanley A. Mumma,et al.  Practical cooling capacity estimation model for a suspended metal ceiling radiant cooling panel , 2007 .

[11]  A. K. de Wit,et al.  Hydronic circuit topologies for thermally activated building systems – design questions and case study , 2012 .

[12]  Lieve Helsen,et al.  Evaluation of adaptive thermal comfort models in moderate climates and their impact on energy use in , 2011 .

[13]  Arnold Janssens,et al.  Experimental investigation of the impact of room/system design on mixed convection heat transfer , 2012 .

[14]  Kaitlin Ryan Goldstein.  Convective heat transfer in rooms with ceiling slot diffusers , 2009 .

[15]  Viktor Dorer,et al.  Application range of thermally activated building systems tabs , 2007 .

[16]  Gregor P. Henze,et al.  Primary energy and comfort performance of ventilation assisted thermo-active building systems in continental climates , 2008 .

[17]  Stanley A. Mumma,et al.  Simplified cooling capacity estimation model for top insulated metal ceiling radiant cooling panels , 2004 .

[18]  B. Olesen,et al.  Experimental evaluation of heat transfer coefficients between radiant ceiling and room , 2009 .

[19]  Dietrich Schmidt.  Low Exergy Systems for High-Performance Buildings and Communities , 2009 .

[20]  J. W. Yang,et al.  Effect of Buoyancy on Forced Convection in a Two-dimensional Wall Jet along a Vertical Wall , 1973 .

[21]  Hazim B. Awbi,et al.  Mixed convection from heated room surfaces , 2000 .

[22]  Kate Goldstein,et al.  Convective Heat Transfer in Rooms with Ceiling Slot Diffusers (RP-1416) , 2010 .

[23]  E Forthmann,et al.  Turbulent Jet Expansion , 1936 .