COUPLED ENERGYPLUS AND COMPUTATIONAL FLUID DYNAMICS NATURAL VENTILATION SIMULATION
Rui Zhang, Khee Poh Lam, Shi-Chune Yao, Yongjie Zhang
Energy modeling approaches have continued to ad- vance to cater for emerging new design concepts to- wards“greener” solutions that optimize energy consump- tion in buildings while maintaining thermal comfort as well as healthy environment. Increasing attention is given to passive and mix-mode systems in building. Compu- tational Fluid Dynamics (CFD) model has been widely adopted as effective tool for natural ventilation simula- tions. However, CFD become unstable for conjugate heat transfer model, which is the transient heat transfer be- tween solid, e.g., walls, and fluid, e.g., air. Solid and fluid has different respond times. Typically walls respond in hours, and air responds in seconds, causing the system to become stiff. In addressing the issue, a coupled lumped heat transfer model (EnergyPlus) and CFD model (Flu- ent) was implemented, and 8 days of simulation was con- ducted. The airflowrates of openings from the airflownet- work module in EnergyPlus and airflow rates from CFD model were compared. Results show that airflow network model generally predict smaller airflowrates for the open- ings. Airflow network model generates better results for openings on the south and east facade and internal open- ings, with difference ranging from −100% to −200%.
- There are currently no refbacks.