Natural ventilation optimization of livestock buildings by numerical simulations

Abstract

Numerical simulations and computational fluid dynamics can be usefully integrated with architectural modeling, providing designers with a powerful single CFD based architectural modeling and design framework. This framework can be interfaced with the building thermal performance modeling integrating further fully thermal and flow domains within the architectural modeling. CFD analysis is generally restricted to the building’s environment flows or indoor single rooms and spaces flows study, and the designer must supply boundary conditions in the form of external and internal building’s envelope/wall surface conditions. In the case of natural and mixed ventilation, this presents a fundamental problem as the outdoor and indoor boundary conditions are dynamic, inter-related and interactive via building’s architecture and in addition are dependent on external weather conditions and indoor environment control/related heat gains. Therefore, in this study both sides’ boundary conditions are dynamically described, and integrated CFD, BPS and architectural modeling, as a unique framework - new design method, are developed, leading to natural and mixed ventilation energy efficiency optimization. In addition to the presented method, paper gives results of its implementation in designing the building complex in Belgrade. Finally, needs for further research and engineering development are outlined.

U radu je dat metod optimizacije prirodne ventilacije u cilju smanjenja potrošnje energije i povećanja energetske efikasnosti, odnosno poboljšanja uslova ugodnosti u objektu. Metod optimizacije uključuje ispitivanje trodimenzionog strujnog i temperaturnog polja numeričkim simulacijama. Ispitivanja simulacijama se sprovode za definisan referentni model okolnih objekata u širem kompleksu posmatranog objekta obuhvatajući sve merodavne prepreke strujanju iz pojedinih pravaca ruže vetrova, i definisan referentni model samog objekta. Na osnovu ovako dobijene strujne slike i definisane prepreke vazdušnoj struji za različite orijentacije pravca vetra, se potom definišu unapređeni modeli i korigovani ulazni podaci za preciznije određivanje i složenije strujne slike oko i unutar objekta.