전산유체역학을 통한 간척지 내 벤로형 온실의 자연환기량 분석
Analysis of Natural Ventilation Rates of Venlo-type Greenhouse Built on Reclaimed Lands using CFD
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Recently, the Korean government announced a new development plan for a large-scale greenhouse complex in reclaimed lands. Wind environments ofreclaimed land are entirely different from those of inland. Many standard books for ventilation design didn’t include qualitative standard for naturalventilation. In this study, natural ventilation rates were analyzed to suggest standard for ventilation design of venlo type greenhouse built on reclaimedland. CFD (Computational Fluid Dynamics) simulation models were designed according to the number of spans, wind conditions and vent openings. Thewind profile at a reclaimed land was designed using ESDU (Engineering Sciences Data Unit) code. Using the designed CFD simulation model,ventilation rates were computed using mass flow rate and tracer gas decay method. Additionally computed natural ventilation rates were evaluated bycomparing with ventilation requirements. As a result of this study, ventilation rates were decreased with increasing of the number of spans. Ventilationrates were linearly increased with increasing of wind speed. When the wind speed was 1.0 m·s-1, only side vent was open and wind direction was 45°,homogeneity of ventilation rate at 0∼1 m height is the worst. Finally, chart for computing natural ventilation rate was suggested. The chart was expectedto be used for establishing standard of ventilation design.
Abstract
Recently, the Korean government announced a new development plan for a large-scale greenhouse complex in reclaimed lands. Wind environments ofreclaimed land are entirely different from those of inland. Many standard books for ventilation design didn’t include qualitative standard for naturalventilation. In this study, natural ventilation rates were analyzed to suggest standard for ventilation design of venlo type greenhouse built on reclaimedland. CFD (Computational Fluid Dynamics) simulation models were designed according to the number of spans, wind conditions and vent openings. Thewind profile at a reclaimed land was designed using ESDU (Engineering Sciences Data Unit) code. Using the designed CFD simulation model,ventilation rates were computed using mass flow rate and tracer gas decay method. Additionally computed natural ventilation rates were evaluated bycomparing with ventilation requirements. As a result of this study, ventilation rates were decreased with increasing of the number of spans. Ventilationrates were linearly increased with increasing of wind speed. When the wind speed was 1.0 m·s-1, only side vent was open and wind direction was 45°,homogeneity of ventilation rate at 0∼1 m height is the worst. Finally, chart for computing natural ventilation rate was suggested. The chart was expectedto be used for establishing standard of ventilation design.
참고문헌 (27)
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