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Computational Fluid Dynamics (Cfd) Applications At The School Of Architecture, University Of Hawaii: Summary: Summary Conclusion For Occupant Comfort In Naturally Ventilated Spaces
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2015
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[PDF-8.59 MB]
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Alternative Title:Asia-Pacific Research Initiative for Sustainable Energy;Systems (APRISES);
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Description:This report summarizes the research work of the Computational Fluid Dynamics (CFD) research program (Research Program) which is sponsored by the Hawaii Natural Energy Institute (HNEI) and the Office of Naval Research (ONR). The Research Program endeavors to apply advanced building modeling in the context of alternative building conditioning at the Environmental Design and Research Laboratory (ERDL), University of Hawaii at Manoa. The research work of the Research Program, which was conducted in three parts, made important contributions to the understanding of the thermal performance of primarily naturally ventilated buildings. In this context “primarily naturally ventilated” buildings are buildings that might have a mechanical assist ventilation system available for periods of insufficient external wind induced driving forces for air movements inside of buildings. Conventional mechanical space conditioning has to fulfill three main functions, which are space cooling, dehumidification and ventilation. In naturally ventilated buildings the energy demand for these three functions are avoided, since the state of outdoor air entering the buildings is not changed and ventilation is induced by external environmental conditions. Assist ventilation requires some quantity of energy, but this energy demand is significantly lower than mechanical ventilation in a conventional HVAC system. Hawaii’s tropical climate is characterized by extended periods of warm and moist weather. Buildings in such a tropical climate have both high cooling energy demands and also a high energy demand for dehumidification of the outdoor air supply brought into the building. As warm and moist outdoor air supply is cooled, its relative humidity rises. In order to achieve acceptable relative humidity levels, the outdoor air has to be dehumidified, which means humidity has to be expelled from the outdoor air. Conventional dehumidification is accomplished by cooling the air below its dew point and separating condensate from the air. This process requires significant energy. Insufficient dehumidification can cause or contribute to a range of problems in building operations, including health related problems for occupants, such as mold and sick-building syndrome.
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Sea Grant Document Number:HAWAU-T-15-003
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Rights Information:Public Domain
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