Abstract
In this paper the ventilation through a rooftop greenhouse situated at Coronia Gardens in the Johannesburg Central Business District is investigated. This is done through analysing the greenhouse numerically using computational fluid dynamics. Results indicated that the temperature was unevenly distributed along the length and width of the rooftop greenhouse. The greenhouse was then modified to have roof openings which were recommended by researched literature. The CFD simulation demonstrated a more even distribution of temperature throughout the greenhouse. Less dead spots were seen, and flow was encouraged throughout the greenhouse. However, a relatively large velocity was measured at the inlet at the beginning of the greenhouse which could cause a slight nonuniform crop yield. Overall, the modified greenhouse is a possible solution to the problem areas found in the original greenhouse.