A breath of fresh air

An innovative air-conditioning system could improve air quality and energy efficiency in the home, its UK developer claims.

Designed at Cambridge University’s Martin Centre for Architectural and Urban Studies, the Dwell-Vent system combines two tried-and-tested technologies: ‘passive stack ventilation’ and ‘supply air’ windows to replace stale air from inside the home with warm fresh air from outside.

Passive stacks are metal tubes typically installed in kitchens and bathrooms that remove warm and humid air by allowing it to rise up through a vent in the roof. This removes condensation but wastes heat.

Supply air windows are similar to double glazing except that the gap between the panes is used as a route for air to enter the building. The gap also helps warm the air before it is released back into the room. The system’s developers estimate that Dwell-Vent could reduce heating costs in an average home by 15–20 per cent.