High-Performance Tower in Australia

HIGH-PERFORMANCE TOWER IN AUSTRALIA Adaptable Platform “Urban” vertical neighborhoods replace the horizontal “suburban” model for workplace. shading by panel with integrated PV internal operable screen reflection 60%; transmission 20% window opennings high selective solar protection glazing: g-Value 0.35 U-Value 1.8 W/m 2 K infiltration: 0.2 ACR/h 4m 4m perimeter: 60% radiant panel center: 20% radiant panel acoustic panel overhead fresh air supply with textile ducts spill over to Park 36 m³/hPers ~ 2.4 ACR elevated air speed 0.3 to 0.5 m/s PMV: +/- 0.5 Top: 22 .. 28 °C tempered Air cooling: at 18°C temp. and Dew Point heating: at 21 °C shading by panel with integrated PV Resiliency mode: supply of filtered air from mechanically controlled zones ceiling fans, occupant controlled IGU with low-e coating on #2 visual transmission 70% U-Value 1.8 W/m²K external operable screen reflection 60% transmission 20% elevated air speed 0.4 to 1.0 m/s PMV: +/- 0.5 openable facade ~ 40% openable natural ventilation ~ 10 ACR single glazing, 18° inclined: wind and rain protection U-Value 5.6 W/m²K with 70/41 XIR film controlled natural ventilation of Park solar gains in winter wind and rain protection Infiltration: 0.5 ACR/h Top: 22 .. 24 °C natural ventilation with BMS operated openings (underfloor) convecor for heating ventilation Infiltration: 0.2 ACR/h single glazing with high selective XIR foil daylight 70%, SHGC 41% wind and rain protection U-Value 5.6 W/m 2 K shading by panel and frame structure controlled natural ventilation external operable screen transmission 10% ceiling fans, occupant controlled natural ventilation in summer, max. 10 ACR infiltration 0.2 ACR openable facade louvers, min. 1.5 m 2 openable per 30m 2 room bathroom exhaust Resiliency mode/ambient Temp >27 °C: tempered air supply with 18 °C 36 m 3 /h per person facade convectors for heating elevated air speed 0.4 to 0.8 m/s PMV: +/-0.5 internal loads: 4 W/m 2 el. Equipment 4.5 W/m 2 artificial light (daylight controlled) internal screen fully glazed facade return air fresh air mixed ventilation return air exhaust air exhaust air mixed ventilation fresh air return air mixed ventilation return air internal screen fully glazed facade internal screen fully glazed facade displacement ventilation chilled accoustic ceiling (60%) overflow to central core area fresh air via raised floor central exhaust via core area elevated air speed operable facade natural ventilation outdoor gardens wind protection as required Thermal zoning in typical Atlassian Habitat The thermal zoning will provide a rich diversity of highly comfortableandhealthyworkingenvironments. Thearrangement of the zones can be described as a gradient from mechanically controlled to naturally conditioned to outdoors. This climate concept is unlocking the high potential of natural ventilated spaces and creating thermal comfort in the climate of Sydney. The innovative mechanically and the natural ventilated zones are both for permanent typical office use. The protected Park is designed as co-office space. We also refer to the zones as Type A, Type B and Type C office spaces. Protected Park - designed for co-office spaces The Park areas are facing North and West and are protected by a single glazed facade against wind, gusts, and rain. The Park areas are well ventilated but not heated or cooled. The Park areas are designedasprotectedoutdoorareas.Assuch,people’sexpectation is set to outdoor comfort. Expectations are to find a comfortable naturally ventilated protected outdoor environment. In these environments, people have adaptive choices to move, change location, adapt clothing and activity, and extend or shorten time of stay. The Park is not intended to be used as a permanent office space with working at desk conditions where tightly controlled conditions are expected and required. There is shading by trees, facade, building structure, and shades. The conditions are rated as excellent for co-office spaces with temporary and flexible use. Because of the comfortable conditions the Parks are rated as NLA. Resiliency concept Natural ventilation is expected to provide excellent fresh air conditions in the Park and naturally ventilated zones all year round. For the rare case of heat waves and air pollution by bush fires, air from the mechanically suppled areas is spilled over to the natural ventilated areas and then to the Park. Based on a fresh air supply of 36 m³ per h per person the average fresh air amount in this rare working condition is in average 28 m³ per h and all persons in the habitat which is rated as good for normal conditions and excellent for extreme conditions. Ready for climate change To consider future climate change and temperature rise in the building design, the Ersatz Future Meteorological Year 2030 Most Warmest was purchased for the location. Adaptive comfort concepts in general are robust when it comes to climate change. Stil, to prove, the purchased data are used to test and verify all comfort and energy calculations. For the fully conditioned zones (Type A office spaces) an innovative mechanical system with radiant panels and tempered air supply is proposed. The cooling effect will be augmented by ceiling fans, which can be locally controlled to the user preference. Designed for a gentle breeze of max 0.7 m/s the perceived cooling effect is equivalent to a temperature drop of 3 degrees. The operative temperature level is designed to be between 22 °C to 26 °C, with some hours peaking to 28 °C, the PMV between -0.5 and +0.5 which can be rated as an excellent thermal comfort. Locally, tempered air of minimum 36 m³/h per person will be supplied on a temperature and dewpoint level of 18 °C in cooling mode. The total mechanical ventilation system is designed to provide up to 45 m³/h fresh air per person. The CO 2 level in the space will be in the range of 600 to 800 ppm, which creates excellent IAQ. Themoderate coastal climate of Sydney allows to widely open the facades and flush the space with natural ventilation for most of the year. At very hot days, elevated air speed by ceiling fans will provide excellent comfort without any additional cooling. A high air change rate removes internal and solar loads. The natural ventilated areas have large sliding doors to the protected Park. These doors are operated manually by the occupants but BMS controlled in winter mode. The openings are sized for minimum 10 air change rates per hour in summer, providing excellent IAQ. In winter, the BMS controlled sliding doors open just enough for fresh air supply without compromising comfort. Small convectors along the facade to the Park will provide heating. The natural ventilated office spaces are designed to achieve operative temperature levels ranging between 21 °C to 28 °C, with some hours peaking to 29 °C the PMV between -0.5 and +0.5 which can be rated as an excellent thermal comfort. For heat waves and times of bush fire a resiliency mode is in place. The YHA is currently undergoing a design review for program areas, floor plates and facade. So, as example, only the design intent for the dorms is sketched out here. Most likely the design of the facade will change from a double facade to a single layered facade. The team is working on re-engineering a single layer facade to provide the functions of excellent solar gain control, daylight autonomy, functional natural ventilation maintaining the high esthetical quality of the original design. The Dorms shall be naturally ventilated throughout most time of the year. In case of high outdoor temperatures (>27 °C) or extreme events like bush fires, windows can be closed, and tempered air of 18 °C and 36 m³/hPers will supply the rooms with cool and fresh air. Like in other naturally ventilated areas, elevated air speed will be applied to enhance comfort. Rooms will be heated. With a good functional facade design there is no need for additional active systems for cooling in the Dorms. Anyhow, at the current status of the design, the YHA is requesting an additional conventional low temperature cooling system for the Dorms. _______ Model Predicted Mean Vote (PMV) The target range -0.5 to + 0.5 for PMV indicates excellent comfort according to ASHRAE. _______ Type C Co-office space in Park (NE) Considering adaptive comfort choices people have, the protected Park will be comfortable for more than 90% of the time, if rated with PMV against the high thermal standards for indoor conditions. _______ Type B Office (NE) The thermal comfort in the natural ventilated areas is excellent. For about 8% of the time the resiliency mode is activated for the extreme climate data set. _______ Type A Office (SE) The combined effects of radiant control and elevated air speed create excellent conditions for 100% if the operation times. _______ YHA Dorm Level 3 (SW) The comfort concept of the dorms will create an excellent comfort. The users will engage with the climate and their personal preferences given the manual control of openings, shades, and ceiling fans. The thermal conditions are rated as excellent. The ground level of the Park zone (green) is at level 1 of each Habitat. Level 1 to level 4 are connected by this Park volume on the northwest side of the building. Every fourth level, the Habitats are separated horizontally from each other. A typical Atlassian Habitat has four thermal zones: innovative mechanically conditioned 55%, natural ventilated 15%, protected Park 10%, and core 20%. The blue zones indicate the innovative mechanically conditioned zones. These are predominately orientated towards the East and South side of the building. Adjacent to the Park zone are the naturally ventilated areas (yellow). These zones are ventilated from and to the Park zone. In level 2 and level 3, the naturally ventilated areas are increased and wrap around the West and North orientation. On level 4 there are no more permanently naturally ventilated areas. The space has opening towards the park but relies on mechanical ventilation to allow flexible use of the large open area. min. 25% naturally ventilated office zones in the tower building min. green plot ratio of 2.5 in the tower building Innovative mechanically conditioned Natural ventilated Protected outdoor _______ Design intent for thermal zoning and comfort Future workspaces will be closer to nature. Thermal comfort is more than air temperature In general, thermal comfort of humans is influenced by a total of 8 environmental parameters. Comfort design considers all these parameters with advanced thermal comfort indices such as PMV (Predicted Mean Vote). The model allows to evaluate adaptive comfort concepts considering complex details of the radiant environment together with effects of elevated air speed. The results are plotted into human-biometeorological charts with PMV comfort index over room temperature and humidity, indicating the hourly comfort including effects of elevated air speed and adaptive choice of clothing in winter and summer. _______ Schematic of a habitat _______ Innovative mechanically conditioned zone _______ Natural ventilated conditioned zone, summer _______ Natural ventilated conditioned zone, winter _______ Naturally Ventilated – YHA Dorms (guest rooms) “Process is key to unlock the potential of sustainable design. The challenge design teams face, is to engage in a framework for integral design verifying design decisions early on all relevant levels. Designing for people, designing for comfort supports that paradigm shift towards buildings that interact actively and positively with the environment and give something back on the location. As an outcome goals for low energy, for low carbon emissions and more holistically for sustainability and wellbeing are automatically achieved.” ____ _______ _______ __________ Transsolar Climate Engineering, Director Wolfgang Kessling “The design approach for this tower is clearly driven by performance and efficiency, and Sustainability -Atlassian’s definitive identity value-, became the main metric that facilitated decision making during the entire creative journey. Among many others, some of our key driving factors include responsible energy consumption, materials carbon footprint, indoor optimization of local climate, responsible sourcing and utilization of local resources. In summary, the combination of a clear early green focus and a talented and committed team, resulted in the creation of a building that not only accurately captures Atlassian’s values and future aspirations, but also differentiates it as the new paradigm of “responsible citizen” in the city of Sydney. ” ____ _______ _______ __________ Atlassian, Global Head of Workplace Design David del Villar “The Atlassian headquarters occupies an interesting position relative to sustainability and the transformed workplace priorities implied by the Covid-19 pandemic,” Corie Sharples said. “The design was in place prior to the current crisis—with its spaces largely determined by environmental parameters—still, the typology it pioneers holds great promise for wider adoption in the post-Covid future.” ____ _______ _______ __________ SHOP Co-Founder Corie Sharples From box to space ADAPTIVE COMFORT, CLIMATE AND NATURALLY VENTILATED TOWER _______ View into co-office space in habitat