Most natural ventilation systems introduce fresh air into sealed offices without difficulty in summer. But once temperatures drop below 15℃ they are either switched off, or use heaters to warm the cold air- a solution which demands a lot of energy. Now, a Cambridge University spin-off, Breathing Buildings, thinks it has a better solution. It involves mixing the fresh (but cold) incoming winter air with the interior air. The latter is of course much warmer. Combining the two can produce air which is fresh, but does away with the cold draughts typical of many ventilation systems in winter.
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