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Cibse rules of thumb

‘Rules of thumb’ updated

We are still learning how to design and use natural ventilation. Historically, the need for a supply of fresh air at a comfortable temperature resulted in distinctive and eye-catching architectural elements, designed to harness the freely available forces of bratz dolls sexy and cibse buoyancy.

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A classic example is the windcatcher rules badgir in Iran. Today, as we are squeezed for space on the ground and build thumb, more striking building features — thumb as atria, lightwells and solar chimneys — are finding their way into our architectural lexicon.

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Ancient windcatcher towers bagdir. Tall buildings offer opportunities for harnessing natural ventilation, not just from the wind but also from buoyancy.

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A tall atrium, linking multiple floors and filled with buoyant air, is a source of driving pressure for ventilation that, tapped into, can supply fresh air to occupants. The taller the atrium — and the greater the temperature difference from the outside either hotter or cooler rules the greater the potential for natural ventilation. Our model does not capture all facets of a buildings design.

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It is a blueprint for an optimised design; a starting point for more detailed modelling using multizone cibse, CFD and other tools.