EASTGATE HARARE PDF

Whether the building has begun to attain a life of its own since occupation is a matter of judgement. This was an attempt to design a building based on the metaphor of a living system more like a termitary. An ecosystem not a "machine for living in. It must also be embedded in its natural and social environment. Eastgate in Harare is an expression of two architectures; the new order of brick and reconstructed stone and the old order of steel and glass.

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Whether the building has begun to attain a life of its own since occupation is a matter of judgement. This was an attempt to design a building based on the metaphor of a living system more like a termitary. An ecosystem not a "machine for living in. It must also be embedded in its natural and social environment. Eastgate in Harare is an expression of two architectures; the new order of brick and reconstructed stone and the old order of steel and glass.

The new order moves away from the international glamour of the pristine glass tower archetype towards a regionalized style that responds to the biosphere, to the ancient traditional stone architecture of Great Zimbabwe and to local human resources. In the new order massive protruding stone elements not only protect the small windows from the sun but also increase the external surface area of the building to improve heat loss to space at night and minimize heat gain by day.

The horizontal protruding ledges are interrupted by columns of steel rings supporting green vines to bring nature back into the city. The model used was the termitary; an ecosystem not a "machine for living in. It is the architectural expression of the technology brought to Zimbabwe by the mineral hungry settlers in the late 19th century.

Eastgate comprises two buildings side by side linked together by a glass roof. Below this, steel bridges and lifts suspended on cables from steel lattice beams span over the atrium below. The lifts connect with a suspended glass skywalk which runs the length of the atrium at level 2.

Along the ridge of the red tiled roof are 48 brick funnels topping internal stacks which pull the exhaust air out of the seven floors of offices below. Under the office floors is a mezzanine plant room behind the cross chevron screen where 32 banks of low and high volume fans draw air from the atrium through filters. This air is pushed up through the supply section of vertical ducts in the central spine core of each office wing.

From the duct the air is fed through the hollow floors to low level grilles under the windows. As it is warmed by human activity it rises to the vaulted ceiling where it is sucked out via the exhaust ports at the end of each vault through a system of masonry ducts to the exhaust sections of the central vertical stacks. In the office space uplighters use the concrete vaulted ceiling to reflect light downwards and to absorb their heat.

The sandwich of the vaulted ceiling and the voided floor above acts as a heat exchanger. Normally the high volume fans run at night to give ten air changes per hour and low volume fans run during the day giving two air changes per hour. By timing the change over from low to high air velocities the optimum use of the diurnal swing of the biosphere can be utilized. During the frequent shut downs of mains power, or of HVAC due to poor maintenance in the other buildings, Eastgate continues to operate within acceptable comfort levels with its system running by natural convection.

This measures: the outside air temperature. The buildings performance has been equal to or slightly better than that originally predicted by Ove Arup the Engineers. People and machines add 1. However, by altering our control system we have reduced this week day build up.

The difference between low level and high level temperatures in the room is 1. The challenge for improvement is in the following two areas.

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Eastgate Centre, Harare: Address, Eastgate Centre Reviews: 4/5

Glass office blocks are typically expensive to maintain at a comfortable temperature, needing substantial heating in the winter and cooling in the summer. They tend to recycle air, in an attempt to keep the expensively conditioned atmosphere inside, leading to high levels of air pollution in the building. Artificial air-conditioning systems are high-maintenance, and Zimbabwe has the additional problem that the original system and most spare parts have to be imported, squandering foreign exchange reserves. Mick Pearce, the architect, therefore took an alternative approach. Passive cooling[ edit ] Passive cooling works by storing heat in the day and venting it at night as temperatures drop.

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