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Essentially these devices introduce natural ventilation by the

Mtion of pressure at the inlet, induced by the wing-walls, which effectively 'catch' the wind from a range of directions. The position ,f the wing-walls and air-locks within the plan-form are based on Ye.jng's oyvn assessment, assisted by data from the wind patterns ,1 the locality The overall experimental nature of this system has been subsequently verified by CFD analysi wrth positive results.

The key reason for this experiment lies in the economics of the original project. Because of the low rental rates perceived to be applicable in Penang, the original project was designed for tenants to install their own air-conditioning units. Yeang therefore proposed the use of natural ventilation not simply as a source of fresh air supply, but as a true modifier of comfort conditions internally Consequently, Yeang was able to claim that the UMNO Tower is probably the first high-rise office building that uses wind as natural ventilation relative to internal comfort conditions, as a general overall principle.

The fact that central air-conditioning was subsequently installed, now means that the natural ventilation design provides a back-up system to the building, in the event of Power-failure. This factor, together with the natural ventilation and lighting of the serv'ce cores and stairs and lhe protective measures in orientation of the building's mass, collectively r«ults in a genuinely low-en"gy design proposition.

As,de f'oni the simple an<* brilliant technical 'Solution of a plan-form f'^ated by pure principles ,rorn studies of wind and SvUn pa,h' ^11 of which feed following projects, heh« also extended the **Presslv® dimension of

'orcei ¡n the overall archlt*tural composition

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