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The International                        UPDATED 24th February 2010
Journal of Ventilation
Published Quarterly www.ijovent.org.uk          Buy Journal  Online 

March 2010 Edition of the IJV now Published

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August 15 - 18 2010  Syracuse, New York, USA

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Paper 3:  Volume 3 No.4 March 2005 Edition

Derivation of a Theoretical Model to Explain the Functioning of a Window as a Pre-Heat Ventilation Device and its Verification using Physical Models

M E McEvoy and R Southall

Department of Architecture, University of Cambridge, The Martin Centre, 6 Chaucer Road,
Cambridge, UK, CB2 2EB
 

Abstract

‘Supply air’ windows are designed with an air gap between the inner panes of glass that is used as the incoming air path for room ventilation; air is pre-warmed within the window and thereby avoids the sensation of draughts.  A series of tests, verified by model simulations, were carried out to determine those aspects of the window’s specification that govern the extent to which air is pre-warmed by the windows before entering rooms.  The first was a laboratory experiment investigating the influence that the width of gap between the glass panes had on the pre-heating of the airflow, the results from which were simulated using an algebraic model based on fluid dynamics principles.  The following experiments were carried out in test cells analysing the influence of the location of a low emissivity coating within alternative glazing assemblies, the relationship between pre-heat temperature and ambient temperature, and its variation with ventilation rate.  The later stages were modelled by the use of the Computational Fluid Dynamics program FLOvent.  The outputs of these experiments and simulations has enabled a clearer understanding of the physical processes at work, and the development of simulations that accurately predict the window’s performance as a pre-heat device.

Key words:  ventilation pre-heat, windows, sustainability, indoor air quality, measurements, CFD.

References

BRE: (1994) “Passive Stack Ventilation Systems: Design and Installation”. UK Building Research Establishment (BRE). Information Paper IP 13/94.

CIBSE: (2001) Guide B2, Ventilation and Air Conditioning Chartered Institution of Building Engineers.

Faist A and Gay JB: (1977) “The Semi-Transparent Solar Wall Collector Concept”, Proceedings of the 1st International Conference on Solar Building Technology, 25-29 July 1977, pp308-315.

Hemmilä K and Kovanen K (2000) “Advanced Supply Air Window”. Technical Research Centre of Finland (VTT). 2000 Rakennustaito Nr: 4, pp52–53.

Jones PJ and Sullivan PE: (1986) “The Role of Trickle Ventilators in Domestic Ventilation Design” Proceedings of the 7th AIVC Conference: Occupant Interaction with Ventilation Systems, Air Infiltration and Ventilation Centre, pp91-97.

McEvoy M and Baker P: (1999) “An Investigation into the Use of a Supply Air Window as a Heat Reclaim Device”, BSERT Series A, 20, (3) pp105-112.

McEvoy M and Baker P: (2000) “Test Cell Analysis of the Use of a Supply Air Window as a Passive Solar Component”, Solar Energy Journal, 69, (2), pp113-130.

McEvoy M and Southall R: (2002) “Dynamic and Steady State Simulations of Real World ‘Supply Air’ Window Installations” In: Proceedings of the ROOMVENT Conference, Copenhagen, 8th – 11th September, pp465-468.

McEvoy M, Southall R and Baker P: (2003) “Test Cell Evaluation of Supply Air Windows to Characterise their Optimum Performance and its Verification by the Use of Simulation Techniques”, Energy and Buildings, 35, pp1009-1020.

Norlen U and Andersson K: (1993) “The Indoor Climate in the Swedish Housing Stock”. Swedish Institute for Building Research.

Parkins LM (1991) “Experimental Passive Stack Ventilation Systems for Controlled Natural Ventilation”, Proceedings of the CIBSE National Conference 1991, pp508-519.

Yuill GK: (1987) “Laminar Air Flow Super Window”.  GK Yuill and Associates Ltd. for Energy Mines and Resources Canada.

 

IJV Volume 3 No 4
Contents

Paper 1: Case Studies

Paper 2: Field Measurement

Paper 3: Pre-Heat Window

Paper 4: Buried Pipe

Paper 5: Plane Jet

Paper 6: Centrifugal Blower

Paper 7: Simplified Model

Paper 8: Thermal Comfort

 

 

    

                                              

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