Civil 3811 Tutorial Solutions - Week 10 PDF

The University of Sydney School of Civil Engineering Civil 3811 – Tutorial Solutions – Week 10 Question 1 ABS Building: Airflow is currently acquired through the V-shape wings and the specimen tree that is on the south-eastern side (fig. 4). On the ground floor, cross ventilation happens from...

The University of Sydney School of Civil Engineering Civil 3811 – Tutorial Solutions – Week 10 Question 1 ABS Building: Airflow is currently acquired through the V-shape wings and the specimen tree that is on the south-eastern side (fig. 4). On the ground floor, cross ventilation happens from East to West by aligning the entrance with the central axis of the building (fig.3). The cluster pattern in the planned design of the building (fig.5), has enhanced cross ventilation as well as providing stack effect for the upper levels this is due to the central atrium-void in the entrance of the building. This can assist the hot air in going up and through the openings. Additionally, the spiral stair case provides buoyancy driven ventilation that assists the warm air to rise above the cold air and creates an upward air-stream, resulting from the density differences between interior and exterior air. Figure 3. ABS Plan Figure 4. ABS ventilation by the tree  Figure 5. ABS atrium Tyree Building: The ventilation process follows the same rules in Tyree building. In this building as the ABS building , ventilation is mainly provided by buoyancy driven ventilation through the central atrium (fig.6). In the Tyree building, the ventilation is not as effective as ABS because of the design and arrangement of the space which lacks a clear leeward opening. Through the entrance on the ground floor, air goes into the building and rises to the upper level by exchanging hot air with the cold air. Automated glazed areas on the sawtooth roof bring natural light down into a large central atrium and enable it to be naturally ventilated. Figure 6. Tyree Atrium Question 2 Solar systems to increase energy efficiency: ABS Building: In this building, the atrium provides some natural lighting (fig. 5). To control the sun and the natural lighting into the building, a double skin façade made of a glass curtain on the inner side and aluminium louvres on the outer side is used. These louvers have been located with a space between them on the southern side as there is minimal direct sunlight. But on the nothern side, the space between the louvres is smaller. The big tree outside the entrance provides more shade especially during the summer season. Tyree Building: The roof of the building contains photovoltaic cells to gain solar energy. There are glass panels facing south on the roof that assist is gaining natural light while controlling the indoor heat. There are trees on the north side of the building that increases the shade in the summer season. A passive thermal design is provided by the angled horizontal louvres of the upper levels. On the other two sides (east and west), the louvres are placed vertically to increase the control on the light early in the morning and late in the afternoon. This leads to a reduction in solar gain and glare. Because of the orientation of the building, the south-east side receives less sun light. Thus, there is an unshaded curtain wall on this side.