With FVPpulse, LTG presents a new development that replicates the natural movement of the air and consequently helps buildings “breathe”. The FVPpulse decentralised supplied air and return air unit extends the principle of easy-to-implement, non-stationary air flow to office premises. Unlike conventional facade-mounted ventilation units, FVPpulse does without separate air ducts for outside and exhaust air: instead, it has only a single opening in the building skin per unit and uses a system of dampers to switch cyclically between the intake and outlet functions. This non-stationary ventilation results in the thorough mixing of the air in the room at low air velocities and high air volumes. Despite its slimline design, FVPpulse can supply air at a rate of up to 75 cfm (150 cfm in hybrid ventilation mode). The FVPpulse units have fewer main components than conventional facade-mounted ventilation units. While offering the same performance, they are more compact, prevent flow short-circuits at the facade and ensure a comfortable air flow through the room.
Heat recovery unit protected against freezing
A shut-off damper, a large-format air filter and a regenerator for heat recovery purposes are mounted between the fan chamber and the facade-mounted weatherproof grille. The changeover between “breathing” in and out protects the regenerator against freezing because the return air constantly reheats the slats. The air velocity in the regenerator is low because, unlike in the case of counterflow heat exchangers, the air flow passes the entire heat exchanger cross-section in only one direction, thus making silent operation possible. The achievable heat recovery level depends on the length of the intake/outlet cycle and can reach up to 90 percent.
Non-stationary indoor air flow for maximum thermal comfort
The post-treated and filtered outside air is periodically injected into and drawn out of the room. The resulting flow pattern in the room is a pulsed flow in which the supplied air penetrates deep into the frequented area. The periodic nature of the flow results in a greatly reduced air flow velocity. Only a time-lapse video of the flow characteristics can illustrate how harmonious waves of fresh air slowly spread out through the entire room. And there is another advantage: since supplied air and return air are never conveyed at the same time, it is almost impossible for a short-circuit to occur in the air flow.
Using multiple FVPpulse units lets buildings breathe
Buildings that can breathe thanks to the installation of FVPpulse units do not need any cost-intensive air ducts or central return air unit: all that is required are soundproofed overflow ports (LTG type LDO-T) to the corridor areas, for example above the doors. These apertures permit the exchange of air with the corridor area, thus reducing the CO2 concentration and ensuring the effective ventilation of the indoor zones.
When buildings breathe in this way, it is neither necessary nor desirable to synchronise the individual decentralized FVPpulse units. The differing “breathing” in and out cycles of the individual units promote a cyclical air exchange in the combined building areas and prevent unwanted local pressure increases in the building.
The unique mode of operation of these units makes it easy to implement innovative ventilation concepts: