The document summarizes a case study on the East Gate Center in Harare, Zimbabwe. The building employs natural ventilation techniques inspired by termite mounds to cool the building without air conditioning. It uses vertical ducts to draw in fresh air from open spaces and push it up through the building, replacing rising stale air exhausted through ceiling ports. This fractal cooling design has been highly successful, using less than 10% of the energy of a standard office building and saving owners $3.5 million while keeping rents for tenants 20% lower.

1. CASE STUDY ON THE SUSTAINABLE BUILDING
ENVIRONMENTAL SCIENCE OR INTERIORS
MASTER OF ARCHITECTURE 1ST YEAR 1ST SEM
JNFAU
ON EAST GATE CENTER ,HARARE , ZIMBAMBAE
BY -
JAGADESHA RAGHAVA.K
SUBMITTED TO-
AR.SOWJANYA VALLURI

2. INTRODUCTION
Zimbabwe in Africa
Harare in Zimbabwe
Zimbabwe is one of the country located in the southern part
of the Africa continent , Zimbabwe has a subtropical
climate with many local variations.
Harare
By the Köppen climatic classification, Zimbabwe has
different climatic zones, In which Harare comes under
Humid sub tropical climate
Humid sub tropical climate
A humid subtropical climate is a zone of climate
characterized by hot and humid summers, and cool to mild
winters. These climates normally lie on the southeast side of
all continents (except Antarctica), generally between latitudes
25° and 40° and are located pole ward from adjacent
tropical climates. It is also known as warm temperate climate
in some climate classifications
Under the Köppen climate classification, Cfa and Cwa
climates are either described as humid subtropical climates or
warm temperate climates.
Harare comes under cwa classification
Cfa: C = Mild temperate f = Fully humid a = Hot Summer
Cwa: C = Mild temperate w = Dry Winter a = Hot Summer
Annual Highest temperature: 98.1° F (36.7°c)
Annual lowest temperature: 54.1° F(12.3°c)
Average annual temperature: 64.4° F (18°c)
Diurnal temperature shift: 12° F
Average annual rainfall: 32.5 inch

3. Architect: Pearce Partnership
Location: Harare, Zimbabwe
Year of completion: 1996
Cost: $35 Million
Area:
Office space- 279861.67 SFT(26,000Sqmts)
Retail - 60277.9 SFT(5,600Sqmts)
Parking -3,229 SFT(300Sqmts)
The East gate Centre is a shopping centre and office block in
central Harare, Zimbabwe, designed by Mick Pearce. Designed
to be ventilated and cooled by entirely natural means, it was
probably the first building in the world to use natural cooling
to this level of sophistication. It opened in 1996 on Robert
Mugabe Avenue
EAST GATE CENTER
EAST GATE CENTER ,HARARE ,ZIMBABWE
Second floor plan of east gate center
Interiors of east gate center

4. Some pictures of east gate center building
Some of the Materials used
majorly are:-
1. Concrete
2. Steel
3. clay Bricks
Its style defines “old meets new”, where the
traditional stone architecture of Zimbabwe is
combining with the modern brick and glass
construction.
It employs the 19th-century modernist
technology of lattice steelwork; glass
suspension bridges and glass roof, along with
localized stone masonry techniques.

5. INSPIRATION
TERMITE NEST CONSTRUCTION
• Termite tower functions as a lung to the nest
• The hot air goes up and the cold air enters through smaller vents
at the sides of the termite nest
• Wind and sun shape the tower. Daytime wind from the
southeast evaporates the pheromones on the most exposed
surfaces, which means the termites work in sheltered areas only.
Termite tower construction
Termite tower
HOW VENTILATION WORKS…
CHALLENGE: HOW CAN WE DESIGN A
BUILDING THAT MINIMIZES THE HIGH COST OF
IMPORTING AND MAINTAINING AIR-
CONDITIONING IN ZIMBABWE?

6. HOW VENTILATION WORKS…
Working of ventilation in office space
Cactus
FRACTAL COOLING
Smooth bodies v/s prickly bodies
Fractal cooling by prickly bodies
Waffle flooring

7. • Eastgate uses this process well, “Air is continuously drawn from
this open space by fans on the first floor.
• It is then pushed up vertical supply sections of ducts that are
located in the central spine of of the two buildings.
• The fresh air replaces stale air that rises and exits through
exhaust ports in the ceilings of each floor.
• Ultimately it enters the exhaust section of the vertical ducts
before it is flushed out of the building through chimneys

8. SUCCESS:
-EASTGATE USES LESS THAN 10% THE
ENERGY AS A STANDARD OFFICE BUILDING
-OWNERS SAVE $3.5 MILLION
-TENANTS’ RENTS ARE 20% LOWER THAN
SURROUNDING OFFICE BUILDINGS
Daily Temperature readings of east gate center in April 1998