Windvent SV » How It Works »
The Windvent SV unit combines the benefits of a passive stack and an active stack system with the bonus of a free power source.
By design, the terminal utilises the passive stack capability of our Windvent system - delivering fresh air and removing stale air (CO²) from internal spaces, effectively eliminating the need for expensive air conditioning units - and combines it with a solar powered fan to create the option of an active stack system.
The Windvent SV terminal operates on the well-established aerodynamic principal of the stack-effect: air flowing in the terminal generates positive and negative pressure areas. On the positive side, air entering the louvres is directed downwards into the room below. On the negative side, air is induced to leave and stale air (with high CO² content) from the room below rises and is expelled through the leeward louvres.
The addition of a fan transforms this passive stack unit into an active stack where supplementary air can be forced into the system as necessary to boost it’s effectiveness in adverse climatic conditions. The PV solar panels capture solar energy which is then converted to electricity to power the fan’s battery via the internal charge controller unit.
The Windvent SV roof-mounted solar array is positioned at an 11° angle to enable as much daylight capture as possible.
The photovoltaic panels collect daylight and convert this to electricity that is regulated via the PWM charge controller which in turn charges the gel acid battery pack. The battery is charged whenever there is enough available daylight to do so. The standard Windvent SV systems are sized to supply up to 4 hours daily fan usage at all times. This daily/hourly fan usage rate can be increased through suitably sized solar panels and batteries if required; however, the low powered fan can run continuously for up to 16hrs to full battery discharge.
The low powered fans are set as standard to simply switch on/off at maximum dampers or as an optional feature they can be speed controlled variably in conjunction with the damper positions.
