Al Asir, RS; (2005) Passive downdraught evaporative cooling in office building - Jordan. Doctoral thesis , UCL (University College London).

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Abstract

Wind driven ventilation presented in wind tower finds its roots in the Middle East vernacular architecture it catches the upper air stream cools and channelled it down to the occupied spaces. This paper explores the cooling potential of passive downdraught evaporative cooling wind catcher to ventilate an office building in Amman/Jordan. Summer comfort zone for Amman is developed to present a thermal assessment tool for the results. Study case of an office building in Amman is introduced based on the regulations. Theoretical model is initiated to establish the measurements for wind tower based on the accepted internal conditions. The later assumption is based on the required cooling load, tower height and the condition of air leaving the evaporative column. The assumption is tested using TAS software. The results are promising as temperature and humidity results were within 1 C and 5% from the calculated values. Although further work is needed to improve the performance of the upper floor. The results demonstrates that as the tower height increases the water consumption steadily increases until 6m-tower height is reached, the increment becomes less progressive. The average internal temperature is gradually decreases as tower height increases till 7m-tower height is reached, then higher tower is not notably improve the internal temperature. Dehumidification is needed to bring the internal conditions over the cooling season into comfort zone. Comparison of air outlet velocity as a function of tower height between the assumption charts and TAS results illustrates contradictions in air flow regimes. It was concluded that PDEC is viable method for passive ventilation in office building, it managed to bring the internal conditions into the thermal comfort zone with minor energy demand. Keywords Mulqaf Badgir Baud Geer Wind tower Wind catcher Cool tower Passive ventilation stack ventilation, Natural ventilation, Natural cooling Passive cooling Downdraught evaporative cooling Design tools Hot dry climate Jordan.

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