Abstract
The purpose of the study is to find out the effect of the enhancement of natural cross ventilation on the cooling load of mechanical air conditioners for the residential buildings with voids in hot and humid region. We conducted the numerical experiment based on CFD analysis and thermal and airflow network analysis, together with two building models of different voids ratio, and the results are as followed : 1)The provision of multi-directional ventilation openings on the building facades is effective in the introduction of natural cross ventilation into the building using the outdoor wind condition. 2)The air change rate of natural cross ventilation increases with the introduction of voids in the building. 3)In Naha city, the residential building with void ratio of 50%, under the condition of increased natural cross ventilation during the investigation period, has20%reduction of the indoor cooling load compared to the one without. 4)In summer and during intermediate seasons, the thermal environments of residential rooms with void ratio of either O% or 50% are acceptable comfort condition with hybrid air conditioning system utilizing both mechanical and natural ventilations.
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