Traditionally, to maintain a comfortable temperature for people seated in rooms with high ceilings, additionally amounts of heating was required. Needless to say, this increased the heating bill. Ever-growing prices for energy should be reason enough to rethink this strategy, since heat recovery technology keeps a lid on those expenses. The heat inside the air indoors is extracted and returned either through a centralised or decentralised system. The warmth that is already present is simply recovered, rendering continuous heating redundant. This provides added comfort and long-term savings.

Decentralised heat recovery

Application of decentralised heat recovery:

• Individual rooms
• Old buildings
• Newly built houses, passive houses
• Environments with high humidity level
• Environments with unpleasant smell

Frequent air change is vital in closed rooms to ensure quality of air and prevents possible damage due to humidity and mould. As long as you are rely on natural ventilation by opening windows in old, not yet renovated buildings, heat escapes to the outside – costing a pretty penny and is not ecologically justifiable in this day and age.

A decentralised ventilation system is a brilliant alternative. It is installed exclusively in rooms that experience a lot of moisture. The system is set up with little effort and does not require too much constructional alteration, making them a good option both in newly built houses and as a means of support of existing heating and ventilation system in old building.

The room in question is supplied with fresh air from outdoors through a small duct in the house wall, e.g. near the window. Otherwise the duct can be attached to an exhaust shaft. A powerful fan extracts used and humid air by creating negative pressure and transports it to the outside through the ventilation shaft or duct. Incoming fresh air is supplied the same way.

Decentralised ventilation systems with heat recovering units can collect between 70 to 75 percent of the heating energy inside the used air and return it to the same room! There are two different functional modes:

Recuperators (preheater)
Supply and exhaust air stream at the same time, the heat inside the extracted air is transferred directly to the incoming air by a plate heat exchanger, for instance.

Regenerators (short-term heat accumulator)
In ventilation systems with alternating supply and exhaust air a heat store, e.g. ceramic element, is warmed up during the extraction phase. The material has an outstanding temperature endurance so that incoming air is heated up.

A tip for maintenance:
Take costs for frequent cleaning and maintenance work into account! Professional checks and replacement of the filters (if need be) in accordance with the manufacturers guidelines are important to prevent contamination of the ventilation system. Pay attention to the recommended specifications when purchasing new filter units. Coarse, medium and fine particle filters are available on the market, and they must be compatible with your system. Fresh air filters remove pollen and other allergens from the incoming supply. Extractor filters protect the device against impurities such as dust, etc. Improper use can cause the system to clog up and lead to the growth of mould. Furthermore it is essential to make sure possible condensate will not drain off directly on the building envelope before installing the air ducts. Special grilles can be added in this situation to avoid unnecessary damage of the building material.

Stuffy, muggy indoor air usually measures about 20°C as it has had enough time to heat up by itself. In the shape of an airflow it is driven past the incoming supply flow, for instance through a cross-flow heat exchanger, thus passing on the heat. A major part of the heat in the extracted air is transferred to the fresh supply. Alternatively, a temperary storage passes on the heat: The extracted air gives off its heat when it leaves the building, later this heat is picked up by the incoming airflow.

As quite a few constructional alternations need to be done to implement a centralised ventilation system, it has to be planned by a professional architect or energy consultant. Only then a sufficient air change is guaranteed in all rooms. The ventilation shafts should be layed in a way that provides easy access for maintenance. The amount of maintenance required in a centralised system can be rather extensive, because air filters need to be replaced on a regular basis to ensure cleanness of the indoor air. However, the effort is worth the trouble, the enormous energy savings redeem the initial costs quickly and once the system has been implemented completely it will last decades when maintained by a professional.

Summary ventilation systems with heat recovery

The TDA system combines your heating system with a ceiling fan in one big cycle that is automatically controlled by sensors. These TDA ceiling fans fall in the category “decentralised“ too and offer various benefits that make the best of your current heating system! They operate by making use of thermodynamics by circulating air in the environment, generating an exchange of energy. The warm layer of air underneath the ceiling forced down to the ground and spread evenly across the room. The temperature of the upper layer then blends with the cooler layer on the ground. The heat transferring process is finished once the entire air in the room has reached a homogenous temperature. This method is very efficient, saving expenses when used in large buildings and hangars!

The taller the room or building, the more heating costs can be saved - as much as 30%! Even in a heat insulated building the heating load can be reduced by more than 20%. Investing in a TDA model pays off quickly due to the low acquisition costs. Seeing that fans consume only a minimum of power, the operational costs reach less than 5% of the saved heating costs on average.
Gas, fuel, geothermal energy or solar panels – TDA fans can be combined with any type of heating system without much constructional alteration or effort. Another plus is the use during summer where the rotating blades provide cooling by circulating the otherwise hot stagnant air. Switching back from summer to winter mode is done by a central controller unit.
In professional environments, e.g. in assembly hangars, several fans have to be operated at the same time to achieve optimum results. For instance, a 1000m² area with 10m ceiling height requires 6 type 1200 or 1400 TDA fans. We are happy to help you decide about the right quantity for your place of application.

We recommend a fully automated control of the TDA ceiling fans via thermostats in domestic and professional environments. The sensors inside two temperature detectors constantly monitor the temperature difference between the ceiling and the floor and even it out whenever it is required. This allows you to experience maximum comfort in the room. The basic TDA control 6 takes measurements about once in a minute and regulates the rotation speed of the fan blades. The best part is: You do not have to move a single muscle to achieve results. Once the desired room temperature is reached the fans switch off automatically.

Accessories – Everything you need for your system

Upgrade your ventilation systems with tried and tested branded accessories. This category offers useful add-ons for your ventilation units, for instance controllers and regulators, environmental sensors and shutters, as well as everything you need for a successful installation. Extras designed specifically for ceiling fans are also available here.

Rely on the competence of our hand-picked suppliers and our quality requirements for branded goods. The ventilation systems we offer all comply with international safety standards, you will often find that materials can be recycled and are easy to install. A long service life is guaranteed!

A few clicks around our webshop take you to your new product. Use the filter function to sort out specific requirments like airflow or IP ratings. Our detailed product description tells you more about the technical data – simple and convenient, guidance could not be easier.

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