The International                        UPDATED 22nd May 2011
Journal of Ventilation
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IJV Volume 7 No 4 March 2009 Abstracts

Paper 3

Wind Turbulence and Multiple Solutions for Opposing Wind and Buoyancy

D.W. Etheridge
School of the Built Environment, University of Nottingham, Nottingham, UK.

Abstract

The well-known case of a simple naturally ventilated building with two openings, uniform internal temperature and opposing wind and buoyancy forces is re-visited. In particular, it is shown that the effect of wind turbulence can play a deciding role on whether or not multiple solutions occur. It is also argued that in practice the number of possible solutions is three rather than two.

Key words:  natural ventilation, multiple solutions, wind, buoyancy.

References

Andersen KT: (2007). “Airflow rates by combined natural ventilation with opposing wind – unambiguous solutions for practical use”. Building and Environment, 42, pp534-542.

Carey PS and Etheridge DW: (1999). “Direct wind tunnel modelling of natural ventilation for design purposes”. Building Serv. Eng. Res. Tech., 20, (3), pp131-142.

CIBSE AM10:2005: (2005) “Natural ventilation in non-domestic buildings. The Chartered Institution of Building Services Engineers, London, UK.

Dabidian N and Etheridge DW: (2007) “Simulation of a novel heat pipe system for cooling of naturally ventilated buildings”. Proc. of IAQVEC 2007, Tohoku University, Sendai, Japan, Oct. 28-31.

Etheridge DW: (2000a). “Unsteady flow effects due to fluctuating wind pressures in natural ventilation design - mean flow rates”. Building and Environment, 35, (2), pp111-133.

Etheridge DW: (2000b). “Unsteady flow effects due to fluctuating wind pressures in natural ventilation design - instantaneous flow rates.” Building and Environment, 35, (4), pp321-337.

Heiselberg P, Li Y, Andersen A, Bjerre M and Chen Z: (2004). “Experimental and CFD evidence of multiple solutions in a naturally ventilated building”. Indoor Air, 14, pp43-54.

Hunt GR and Linden PF: (2004). “Displacement and mixing ventilation driven by opposing wind and buoyancy”. Jnl. of Fluid Mechanics, 527, pp27-55.

Li Y and Delsante A: (2001). “Natural ventilation induced by combined wind and thermal forces”.  Building and Environment, 36, pp59-71.

Yuan J and Glicksman: (2008). “Multiple steady states in combined buoyancy and wind driven natural ventilation: The conditions for multiple solutions and the critical point for initial conditions”. Building and Environment, 43, pp62-69.

Contents

Paper 1
Plane-Air-Jet Corner Zone Modelling in a Room Ventilated by an Active Chilled Beam

Paper 2
A Novel Method to Measure the Air Entrainment Ratio of an Active Chilled Beam

Paper 3
Wind Turbulence and Multiple Solutions for Opposing Wind and Buoyancy

Paper 4
Stream Tube based Analysis of Problems in Prediction of Cross-Ventilation Rate

Paper 5
Development of Effective Ventilation System for Electric Multiple Unit (EMU) Train for Mumbai Suburban Railway

Paper 6
Integrating Active Thermal Mass Strategies with HVAC Systems: Dynamic  Thermal Modelling  

Paper 7
Roof Thermal Design for Naturally Ventilated Houses in a 
Hot Humid Climate

Paper 8
Book Review
Tropical Urban Heat Islands - Climate Buildings and Greenery

 

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