Lighting in Design Q2 2019

The building’s peak electrical demand is actively reduced through a photovoltaic solar system on the roof that will tie in to the grid. All enclosed spaces are individually switched, making it easy to light only occupied areas; and hot water will be provided efficiently with small, high-performance electric under-counter geysers installed in each bathroom, which alleviate the need for long runs of insulated hot water pipes. Geyser electric requirements will be supplemented by the PV array on the roof. Separate energy sub-meters are provided for lighting and power to accurately monitor energy consumption. The behaviour of occupants and users of the building is critical to reducing con- sumption, and the owners are targeting an overall consumption of 75 kWh/m 2 /year, far less than the 200 kWh/m 2 /year SANS10400 XA require- ment. Carbon emissions have been reduced to 92 kgCO 2 /m 2 /year. The design allows a direct visual connection to the external environment for 80% of the of- fice useable area, thus optimising natural daylight within. A high level of thermal comfort is ensured by addressing the internal operative temperatures through modelling and ensuring they are within the ASHRAE Standard 55-2004 Acceptability Limits for at least 98% of occupied hours. 100% of the usable area is mechanically venti- lated and provides ample good quality outside air by demonstrating a 66% improvement over and above the SANS 10400-O:2011 requirements. Cooling is provided to the building via air cooled chillers, which means that the building does not need to use water to cool the building.

PROJECTTEAM DEVELOPERS: Legaro Properties ELECTRICAL ENGINEER: PWP Taemane Consulting Engineers ARCHITECTS: Daffonchio & Associates Architects MECHANICAL ENGINEER: Graeme Page Consulting Engineers MAIN CONTRACTOR: Legaro Properties SUSTAINABLE BUILDING CONSULTANT: Solid Green Consulting ENVIRONMENTAL CONSULTANT: LEAP Landscape Architect Environmental Planner

14

LiD Q2 - 2019