the new sanral head office - Alive2green

A DESIGN PROCESS M 

A CASE STUDY: THE NEW SANRAL HEAD 

OFFICE

DESIGN CRITERIA 

• A modern building 

• Energy efficiency 

• High levels of IEQ 

DESIGN PROCESS CLIENT REQUIREMENTS E

financial services 

horizontal hierarchy 

all departments on the same level (first floor) 

CEO 

the connector 

Connections between departments, public & private 

corporate services 

engineering services 

landscaped courtyard 

staff zone 

public zone parking 

main entrance 

server room 

ground floor amenities 

board rooms, lounges & staff canteen 

spills into landscape garden 

SANRAL DESIGN HEAD PROCESS OFFICE 

VAL DE GRACE, CITY OF TSHWANE 

SPATIAL ORGANISATION 

E

•Step away from the residential suburb 

•Press the building up to busy street 

•Follow the contours 

•Pick up on the principle views 

•Control the orientation 

DESIGN PROCESS SITE ISSUES 

E

• Mesh sun screening of glazed facade 

• Deep overhangs for sun control 

• Indigenous plant screening of glazed façade 

• Solar reflective glass 

• Double glazing 

• Cavity walls 

• Thermal mass concrete turf roof 

• Site top soil preservation 

• Environmental management plan 

• Xeriscape planting on roof (no irrigation) 

• Daylight harvesting 

• Controlled lighting power density 

• Generous Views out for all occupants 

• Low energy lighting 

• High frequency ballasts 

• Light switching zones / individual control /motion sensors 

• Peak energy reduction strategy with ice storage on HVAC 

• Solar domestic water heating 

• Solar water heating for fresh air heating 

• Heat exchange wheel on fresh air / exhaust air 

• Displacement air reticulation 

• High volume air change rates 

• Good air change effectiveness 

• 4 pipe circulated water HVAC system 

• Individual comfort control 

• Elimination of ODP refrigerants 

• Refrigerant leak detection 

• Elimination of ODP insulation materials 

• Extraction of air pollutants 

• No tobacco smoking in building 

• Low internal noise levels 

• Fully integrated BMS system 

• Indigenous site landscaping 

• Drip irrigation 

• Low VOC paint and carpets 

• Reduction in products containing formaldehydes 

• FSC certified timber flooring, 

• FSC certified doors & joinery 

• Reduction of use of PVC 

• Demountable indoor partitions 

• Recycled steel content 

• Reduced cement use 

• Recycled aggregate 

• Reduced structural frame design 

• Water saving toilet flushing 

• Water saving taps 

• Public Transport integration 

• Bicycle storage, lockers and showers 

• Parking for pool cars 

• Car parking minimisation 

• Site location with good public amenity connectivity 

• Water metering and sub metering 

• Water Leak detection 

• Electricity metering and sub metering 

• Accredited green professionals 

• Provision of recycling initiatives 

• Construction waste management plan 

• Local sourcing of building materials 

• Comprehensive commissioning 

• Post Occupancy building tuning 

WHAT MAKES IT A GREENER BUILDING? 60 INITIATIVES 

M










• Xeriscape planting on 

WATER 

roof (no irrigation) 



































• Elimination of fire sprinklers 


















M














MATERIALS 

















































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• Individual control /motion sensors 




















• Reduction in formaldehydes 



















IEQ 








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• Light switching zones / motion sensors 

• Peak energy reduction strategy with ice storage 







• Centralised chiller 4 pipe fan coil HVAC 





















ENERGY 


















M

FACADES 

ROOF 

FLOOR 

WHAT SANRAL IS THE CRITICAL HEAD ASPECT OFFICE OF DESIGN OF 

VAL DE GRACE, AN ENERGY CITY EFFICIENT OF TSHWANE 

BUILDING? 

ENCLOSURE : 

THE BUILDING ENVELOPE 

M

ORIENTATION 

45 degrees to north 

To achieve maximum energy efficiency we 

need to try to: 

• KEEP THE SUN OFF THE FACADES IN SUMMER 

• ALLOW CONTROLED PENETRATION OF 

WINTER SUN IN THE MORNING AND 

AFTERNOON 

• MAXIMISIE PENETRATION OF DAY LIGHT 

WITHOUT GLARE 

Without compromising DECENT VIEWS OUT 

FOR ALL OCCUPANTS 

Neutralise the notion that there is a 

good and bad side to the building 

DESIGN PROCESS ORIENTATION VS OPPORTUNITY 

E

SUNSCREENING MESH 

MESH SCREENS AND DEEP ROOF OVERHANGS KEEP HEAT LOAD OFF THE FACADES 

FIN SCREEN SCREEN LINE 

DESIGN PROCESS MESH SCREEN SHADING 

E 

GLASS FACADE

SOUTHWEST SUN SCREENING 1 

Southern corner engineering services-twisted mesh sun 

screen 

NORTHEAST SUN SCREENING 1 

Northern corner engineering services -alternating mesh sun screen 

DESIGN PROCESS MESH SCREEN TYPES 

E

Planted Screen wall allows views and dappled 

light 

SANRAL DESIGN HEAD PROCESS OFFICE 

PLANTED SCREEN 

E 

VAL DE GRACE, CITY OF TSHWANE

DESIGN PROCESS THERMAL MASS ROOF 

E

Project specific benefits (internal): 

• Improved energy efficiency via thermal mass and high insulation 

• Increased roof membrane durability and longevity 

• Increased fire retardation 

• Increased noise reduction (Rain and Hail) 

• Use for grey water for irrigation 

• Potential for urban agriculture 

• Increased shielding from electromagnetic field radiation 

• Marketing potential 

Public benefits (external) 

• Aesthetic improvements 

• Potential for increased ecological diversity 

• Storm water management and attenuation 

• Mitigation of urban heat island affect from buildings 

• Improved air quality, CO2 sink / absorption 

DESIGN PROCESS THERMAL MASS ROOF 

E

SCREENS AND OVERHANGS PROTECT GLASS AND ALLOW VIEWS OUT 

FIN SCREEN 

TRANSPARENT 

MESH SCREEN 

GREEN PLANTING 

SCREEN 

DESIGN PROCESS MAKING ENCLOSURE: 

E 

THE BUILDING ENVOLOPE

HEAT LOAD 467.7KW HEAT LOAD 252.2 KW 

NOTIONAL BUILDING 

SANS 204 BENCHMARK 

WHAT MAKES IT AN ENERGY EFFICIENT 

BUILDING? 

ACTUAL BUILDING 

ENVELOPE PERFORMANCE 

M

HVAC 

SUMMER DESIGN 

SANRAL HEAD OFFICE 


M

HVAC 

WINTER DESIGN 



M

*R 36,984,330 *R 17,254,236 

NOTIONAL BUILDING 

SANS 204 BENCHMARK 

WHAT MAKES IT AN ENERGY EFFICIENT 

BUILDING? 

Quantity Surveyor: KDMQS 

ACTUAL BUILDING 

*Nett Present value of LCC over 25 years of HVAC system energy consumption assuming 12% annual escalation 

LIFE CYCLE COST ANALYSIS FOR THE HVAC 

SYSTEM 

M













21 INITIATIVES 

1

the new sanral head office - Alive2green

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