181 TDA-Control 6 D #983019 Less heat loss Roofs that remain free of snow in the winter are a sign of unnecessarily high heating costs. There are often thermal bridges in the roof due to poor or non-existent insulation, allowing most of the heat accumulated under the roof to escape. Fan-assisted air heater Fan-assisted air heater The right fans Not every ceiling fan is suitable for use in high rooms. Traditional, decorative ceiling fans usually lack the necessary range. The air current “breaks off” far above the ground and flows back up to the ceiling. Although the thermal layers in the top half of the room are mixed, it fails to reach the occupied part of the room at floor level, which is where the heat is needed. The same thing happens with reverse operation, which is useful in low rooms but no longer effective for heat recirculation in rooms more than 2.6 m high. The specially shaped metal blades on TDA fans overcome natural buoyancy even in rooms with high ceilings, allowing the warm air to reach far down the room. With fine-tuning on the TDA-Control, the air speed can be adjusted to suit almost any room conditions and hall construction characteristic. Universal application The TDA system can be configured for many different purposes and situations. There are four sizes that can be combined as required, customisable drop rods in various lengths, and optional IPX5 fans with protection against water jets. Intermediate transformers can reduce air speed in different sections of the room, making it possible for the system to be used in almost any building environment. Cooling in the summer A manual setting on the TDA-Control allows the system to be operated by hand as a speed controller outside the heating season (summer mode), introducing a refreshing air flow into otherwise stuffy, overheated rooms. This improves concentration and physical comfort, which also increases productivity. A simple switch allows the control system to be changed back to winter mode. The intelligent control system The new intelligent control units in the TDA-Control series are equipped with two semiconductor temperature sensors. One of these is installed at ceiling level and one at floor level. Ordinary twisted pair cables up to 50 metres long are used for the wiring. The unit measures the temperatures at ceiling and floor level up to 60 times per minute, calculates the temperature difference, and uses the extent of this difference to control the speed of the fans completely automatically. Once the thermal stratification is reduced and the temperature dif ference drops below a conf igurable threshold, the TDA-Control 6 automatically switches off the units. It is possible to select the minimum temperature differences at which the fans should switch on (threshold), the minimum and maximum fan speed to prevent draf ts, and continuous operation (e.g. for convection cooling in summer). These fully automatic controls perfectly regulate the system without the need for user intervention, which prevents unauthorised persons from playing with the control unit. The TDA system recirculates this warm air back to where it is needed: the occupied part of the room where people work. This significantly lowers the temperature at roof level. And with the area below the roof considerably cooler, less heat can escape. Perfect thermal destratification with the TDA system
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