INAHE   25987
INSTITUTO DE AMBIENTE, HABITAT Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
AIR MOVEMENT IN THE WALL CAVITY OF THE OPAQUE VENTILATED FAÇADE. ANALYSIS OF EXISTING CASES IN BARCELONA.
Autor/es:
PARICIO, IGNACIO; PARDAL, CRISTINA; COCH, HELENA; BALTER, JULIETA; GANEM, CAROLINA
Lugar:
Edimburgo
Reunión:
Congreso; Passive Low Energy Architecture. PLEA.; 2017
Resumen:
The Opaque Ventilated Façade supposes an improvement compared with a conventional façade in terms of thermal comfort and energy efficiency. This is due to the possibility of getting continuous thermal insulation ahead the slab edges and to the protection of the exterior sheet from direct solar radiation.However, in buildings with OVF the constructions characteristics in the wall cavity are often different from that considered in academic studies, performed by simulations or prototype measurements. The present work analyses the air movement in the wall cavity of the OVF of ten buildings in Barcelona. The study cases were specified in their building characteristics, for which the most important variables were determined: opening of air inlet and outlet, open joints surface and dimensions of the wall cavity. Measurements were made in summer using a Testo405i thermal anemometer with management via a smartphone. The methodology consisted in the monitoring of the cases in periods of 30 minutes in the morning and 30 minutes in the afternoon. The data were recorded every two seconds, according to the sequence: 5 minutes outside, 20 minutes inside the wall cavity and 5 minutes outside. The extensible telescope (400mm long) of the anemometer was introduced by the open joints of the outer sheets, so that the sensor is perpendicular to the vertical air flow in the wall cavity. The results show average air internal velocities between 0m/s and 0.68m/s, with average exteriors between 0.16m/s and 2.75m/s. Respect the temperatures, they tend to increase in the interior, which is that there tend to be gains of heat in the wall cavity: the average temperature increase during hours of radiation on the south-west façade reaches 5°C. Based on this methodology, for future work we suggest further analysis of the cases studies with measurements at different heights of the wall cavity.