F.G.H. Koene , R. Schuitema , M. Houkema
Year:
2005
Bibliographic info:
Building Simulation, 2005, Montreal, Canada, 8 p

CFD calculations on night cooling by natural ventilation have been carried out for two different opening geometries: 1) a set of panels and 2) a 'parallel window'. Ventilation rates for these geometries have also been measured in a research facility. A considerable amount of scatter is found in the measurements, due to limitations of the experimental set-up. These are discussed as well as limitations of CFD calculations Both measurements and calculations show a general trend of increasing ventilation rate with increasing temperature difference between indoor and outdoor climate, as expected. In spite of the relatively small opening of the parallel window (3cm all around), ventilation rates measured are only about 30% lower than those found with the panels. Apparently, this window design is quite effective in combining inlet and outlet opening into a single component, simplifying the actions needed for night cooling (manual or automated).