Wind Driven Roof Terminals
Gilberts Model VNT
As well as Natural Ventilation Exhaust turrets we are also able to design and manufacture wind powered roof top terminals accommodating a large variety of sizes, heights and shape profiles.
A wind powered system operates somewhat differently than a stack effect natural ventilation system relying more instead on the wind driving cool fresh air down into the building with the warmer air then exhausting back both through buoyancy and incoming air pressure displacement.
In order to facilitate this airflow routing the turret is fitted with specialised internal splitters that provide four separate, individual air paths. Air is driven down into the occupied zone through one or more of these airways to cool the space with the warmer exhaust air then evacuated through the remaining airways. Due to the design the wind direction is not important and the unit can operate very effectively using wind from any and all directions, although wind direction will determine which airways are used at any particular point in time.
Cooling incoming air is turned through 90 degrees inside the turret and directed down towards the occupied zone. Turrets are typically fitted to the roof using a matching installation sleeve with built in thermal barrier. This sleeve conduits air down through the roof void into the occupied zone but before doing so, at the sleeve outlet, passes through an insulated blade motorised volume control damper which allows the air to stop, pass or modulate as demand and climatic conditions require. The damper will typically be linked to the natural ventilation building management system for fully automated operation.
Wind powered terminals can be an effective and energy efficient means of providing cooling utilising little or no energy.
Different shapes styles and profiles are available to position the device both as a functional natural ventilation solution and an aesthetic design solution.