Transactions of the ASAE · 1998 · 59 citations · 0 references
EngineeringBuilding ScienceBuilding PhysicsComputational Fluid DynamicsVentilationAirflow SimulationNatural VentilationNatural Ventilation SimulationVentilation ModelingVentilation Performance EvaluationVentilation SystemsAir ExchangeAir Exchange Rate CalculationCfd ValidationNatural Ventilation AnalysisNatural Ventilation ModelingSawtooth GreenhousesVentilation Rate PredictionVentilation Rates
A computational fluid dynamics (CFD) program, Fluent V4, was used to predict natural ventilation rates and airflowpatterns of a multi-span, sawtooth greenhouse for various roof and side vent openings and outside wind speeds.Predicted rates were found to be both well above and well below a standard volumetric air exchange rate of 1.0 A.C. min1.The maximum and most acceptable ventilation rates were obtained with the combined use of a windward side vent andleeward roof vents on all multi-span sections. Ventilation rates ranged from 1.4 to 4.01 A.C. min1 for the best two-span caseand 0.14 to 2.0 A.C. min1 for the similar four-span case for outside wind speeds of 0.5 and 2.0 m s1, respectively. Predictedventilation rates ranged from 0.17 to 0.7 A.C. min1 when no side vent was used and the roof vents were fully open.