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ENGINEERING EARTH’S DEVELOPMENT, PRESERVING EARTH’S INTEGRITY GOLDER BUILDING 1 EXCEEDS SUSTAINABILITY TARGET ORIGINALLY PUBLISHED IN: PLUMBING AFRICA, AUGUST 2015 ARTICLE RE-PRINT AUTHOR(S): ILANA KOEGELENBERG Golder House Building 1 exceeded its target to achieve a 5-Star Green Star SA Existing Building performance PILOT rating, achieving a 73% reduction in water consumption (compared to a similar building) and realising a significant energy saving. Building 1, Golder House is one of seven buildings situated in the Maxwell Office Park, as part of the greater Waterfall Development precinct. The development has easy access to Johannesburg and Pretoria via Allandale road and the N1 highway, and is situated near the Waterfall Netcare hospital and the future Mall of Africa retail centre. The building comprises of 5 412m2 grade A office space, spread over three office floors with two basement parking levels accessed by means of a vehicle ramp on the south-western corner of the building. The entrance foyer on the south side incorporates a triple volume atrium which allows ample daylight into the space. The office area on each floor is split into two wings with the ablutions and circulation area in the middle. Light-wells have been introduced on either side of the central ablutions to allow sorne daylight into the adjacent office areas. Two roof lights with clerestory windows further allows daylight to penetrate into the top floor. The base building design also allows extensive opportunity for external views. The benchmark consumption for the building is set at 245,69kWh/ m2/annum. According to the energy performance benchmarking of this building, the annual energy consumption is approximately 182,51 kWh/m2/annum. This is based on the Green Building Council of South Africa's Energy Benchmarking Tool. Based on the current City of Johannesburg of R1 ,00/kWh an estimated total saving of R171 929,60 per annum can be realised. ENERGY AND ENVIRONMENTAL STRATEGIES Building 1, Golder House has various strategies and initiatives in place that accommodate the reduction of energy demand and consequently greenhouse gas emissions. THIS ARTICLE HAS BEEN REPRINTED WITH PERMISSION FROM “NAME OF PUBLICATION HERE”. THE LAYOUT HAS BEEN CHANGED FOR THE PURPOSE OF THIS REPRINT. Building 1, Golder House's energy efficiency strategy incorporates: • Appropriate zoning of mechanical system; • Variable Speed Drives for mechanical equipment to reduce operational energy consumption; • Carbon Monoxide (CO) sensors in the basement to reduce energy consumption of extraction fans; • Efficient lighting and occupancy sensors; • HVAC management system; and • High performance glazing system and external shading devices. RAINWATER HARVESTING Rainwater is drained from the roof via the Geberit Pluvia system and collected in the Kyasol underground rainwater harvesting tank located in the garden to the west of the building. GEBERIT PLUVIA SYSTEM The special construction of the Geberit Pluvia roof outlet ensures a closed water column forms in the pipes which generates negative pressure in the piping system and causes the water to be suctioned off as a result. The discharge velocity and capacity increases considerably in comparison with conventional outlets, despite the smaller pipe dimensions. The high flow velocity of the water improves the self-cleaning forces and minimises the danger of blockages in the pipes. RAINWATER HARVESTING SYSTEM To slow down the water velocity from the Pluvia system, a Pluvia speed breaker sump is installed. From there, the water gravity flows to an Optimax pre-filter unit before entering the two 6 500 underground tanks. A floating suction strainer is used to take of the water 10cm from the surface to allow the cleanest possible quality of water to be used. A submersible priming pump delivers the water on demand to the internal booster pump (in Basement- 1) that boost the rainwater to the water closets 0/VCs) and urinals of the building. The booster system is equipped with an expansion vessel to reduce the pumps running time. The system is also equipped with automatic switchover to municipal water. If the tanks are empty or in the event of a power failure the switchover device would automatically switch to municipal supply. METERING AND SUB METERING Metering and sub-metering of energy and resource use is a critical component of comprehensive operations and maintenance. Metering provides the information that allows the building operations staff to make informed decisions on how to best operate mechanical, electrical and water systems and equipment. Building 1, Golder House is equipped with Echelon electronic smart meters for energy metering. Besides the main bulk meter, separate sub-metering is done for loads larger than 1OOkVA. The smart meters are remotely monitored by UAS utility management services contracted by Atterbury for Maxwell Office Park. There is a City of Tshwane electricity and water council meter installed at the building and UAS supplies the meter readings for electricity to Eskom and water to the City of Johannesburg municipality. The predicted municipal water consumption of the building is approximately 0,17kVm2/annum. The water metres accurately inform the performance of the building durin goperations, therefore allowing for any deviations to be detected timeously and addressed quickly thereafter. WATER REDUCTION The following water reduction initiatives are currently in place at Building 1, Golder House: • To reduce the annual water consumption of the building for the flushing of WCs, dual flush cisterns are installed throughout the building which reduces the average flush volume. This means only a small quantity of water will be used when light flushing is needed. • All taps are fitted with flow restrictors which reduce the flow rate of the water leaving the tap,this ensures that no water is wasted through unnecessary use. • Building users and visitors are encouraged to use water sparingly through initiatives such as closing all taps and not letting them run unnecessarily; using dual flush toilet systems in the intended manner and reporting any leaks to the facilities manager immediately. and second floor. Under-counter energy-efficient geysers were installed for hot water in kitchens and advanced hydro- Zip systems supply boiling water for tea/coffee and filtered chilled drinking water. There is an additional insulated hot water circulation system located in Basement -1 that provides hot water to the showers and taps in the cyclists change rooms. Circulation pumps circulate hot water around the building with electrical motors calculated to perform at the minimum energy levels required to equal the heat losses of the inslulated reticulation. The hot water circulation pumps will be controlled via a timer to reduce energy losses in times when the building is unoccupied. The entire hot water circulation system is insulated against any unnecessary heat losses and to ensure that only small hot water circulation pumps are needed. OTHER SUSTAINABLE FEATURES Even the Paint, carpets, blinds, furniture, cleaning detergents of Golder Building One was specially selected. Care has been taken to ensure that 'green' principles apply to the above during construction, fit-out and operation of the building. A waste sorting and recycling facility has also been established in the basement. Owner Developer Architect/Designer Sustakinability Consultant Consultilng Engineer Contractors Product Suppliers DOMESTIC HOT WATER The main water supply will be from the municipal water connection which is reticulated through the site up to the building boundary. An HDPE tank of 5 500 m3 is located in Basement 1 and domestic water is redistributed from here to the rest of the building by a variable speed booster pump. Hot water for the building is generated by a geyser located on the first floor; this supplies hot water to the bathroom taps on the ground, first . Golder Associates Atterbury Skyscape Architects Aurecon Electrical : Quad Africa Mechanical : WSP Wet Services : WSP Civil : DG Consulting Main Building : Group 5 Mechanical : Temp-U-Air Wet Services : JLM Plumbing Civil : DG Consulting Smart meters : Echelon Rainwater harvesting tank : Kyasol Storage tank: JoJo/Kyasol Pluvia system : Geberit Pre-filter unit : Optimax Hot water system : Stiebel-Eltron Sanitaryware : Vaal Pumps : Grundfos Cisterns : Grohe Hydrotaps : Zip Hot water geyser : Kwikot The modern design of Building 1 Building users and visitors are encouraged to use water sparingly through many initiatives The hydro tap in the kitchen area ABOUT GOLDER As a global, employee-owned organisation with over 50 years of experience, Golder Associates is driven by our purpose to engineer earth’s development while preserving earth’s integrity. We deliver solutions that help our clients achieve their sustainable development goals by providing a wide range of independent consulting, design and construction services in our specialist areas of earth, environment and energy. For more information, visit golder.com. THIS ARTICLE HAS BEEN REPRINTED WITH PERMISSION FROM PLUMBING AFRICA. THE LAYOUT HAS BEEN CHANGED FOR THE PURPOSE OF THIS REPRINT.