Aspects of Sustainability
• Recycling facilities provided with sorting for dry / wet waste ;
• Materials used for construction are selected to suit the requirements of the green design Council requirements ;
• Renewable resources used to fabricate components of the building ;
• Cycle facilities provided . Dedicated routes for cyclists provided in basements ;
• Preferential bays for hybrid cars , motorcycles ;
• Performance glazing used to reduce load on HVAC system ;
• Power factor correction is installed at medium voltage to ensure that the maximum demand of the site is equal to the actual energy used ;
• No incandescent lamps are used ;
• Low voltage lamps are kept to a minimum by using alternative technologies like LED lamps , compact fluorescent and natural daylight ;
• All light fixtures are equipped with electronic ballasts ;
• Light fittings in the office environment are equipped with T5 Technology ;
• Occupancy sensors are used in the office space to ensure that the lighting load is kept to a minimum ;
• In addition , the office lights are switched off after hours by the building management system ;
• The architectural designs incorporate the use of natural daylight in the offices , atrium and entrances ;
• External light fittings are switched via photocell ;
• The building is designed to be a notional building as described in SANS 204 and will yield better efficiencies as described in the Code ;
• The HVAC system incorporates a centrally chilled water system for maximum energy efficiency ;
• The HVAC design also incorporates a full economy cycle thereby using external fresh air during optimal external conditions .
HVAC HVAC is a decentralised variable air volume ( VAV ) system serving the office building and ground floor branch , restaurant , Welcome Centre and other special areas .
A high-efficiency water cooled chiller plant supplies chilled water at approximately 8 º C to the various air handling units on the office floors . Condenser water from the chiller is distributed to dry coolers used for heat rejection . The chilled water plant is located in a double volume plant on basement 3 and the dry coolers are located in a triple volume air cooled plant room ( basement 2 , 3 and 4 ).
The VAV air handling units supply filtered and conditioned air at a varying temperature to the office space . The supply air temperature set-point will automatically be reset according to the zone ’ s cooling requirements thus maintaining better air quality and reducing the terminal reheat load and energy consumption . The units are not supplied with an economy cycle due to high humidity conditions in uMhlanga .
The supply air is distributed throughout the airconditioned areas by means of externally insulated galvanised sheet metal ducting . Supply air is introduced into the airconditioned space by means of ceiling mounted VAV swirl diffusers . The diffusers consist of a motorised damper that controls the amount of conditioned air supplied and electrical heater element .
The indoor air temperature is controlled through a wall-mounted set-point adjuster that allows occupants
FNB Acacia House 299