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Passive Downdraught Evaporative Cooling

II. Airflow Modelling

Institute of Energy and Sustainable Development, De Montfort University, Leicester, UK

D. Robinson

Institute of Energy and Sustainable Development, De Montfort University, Leicester, UK

K.J. Lomas

Institute of Energy and Sustainable Development, De Montfort University, Leicester, UK

N.T. Bowman

Institute of Energy and Sustainable Development, De Montfort University, Leicester, UK

H. Eppel

Institute of Energy and Sustainable Development, De Montfort University, Leicester, UK

This is the second in a series of four papers that describe a 3-year EU-funded research project into the application of passive downdraught evaporative cooling (PDEC) to non-domestic buildings. The paper describes the use of computational fluid dynamics (CFD) for modelling PDEC. It describes the modelling techniques used and applica tion to investigate the performance of a hypothetical office building in Seville. From the CFD analysis it is con cluded that: (i) CFD is invaluable for analysing the venti lation performance of PDEC buildings, (ii) wind buffering and appropriate aperture sizes are essential to maintain well-regulated flows, and (iii) a top-down ventilation strategy performs equally well in upflowing mode, e.g. during night venting.

Key Words: Passive downdraught evaporative cooling • Airflow • Ventilation

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