CONCRETCOOL – a symbiosis between component temperature control and supply air provides comfort with high energy efficiency owing to maximum utilisation of free cooling. Almost completely invisible introduction of supply air. Above-average customer satisfaction.

Cooling tubes, made of aluminium with high thermal conductivity and with diameters of 60 or 80 mm, are cast into concrete ceilings in a grid. The internal surface is ribbed to improve heat transfer. The supply air is not fed directly to the rooms: it firstly flows through the cooling tubes within the concrete ceilings. This warms the cold supply air to approximately ceiling temperature, the required  heat being taken from the ceiling. This withdrawal of heat provides the cooling for the ceiling. This supply air is then fed to the room through Kiefer air diffusers, meeting the hygiene requirement for fresh air. An outlet temperature of approximately 21°C is achieved for the supply air without using a supplementary heater. The process is self-regulating and virtually free of variation. The temperature is extremely stable owing to the high storage capacity of the concrete ceilings. Heat recovery by the ventilation system is increased to over 95 % by the addition of the CONCRETCOOL system. As a result, the requirements set out in the German Renewable Energies Act are exceeded. Combined with the potential of free cooling, this results in unparalleled operating costs and high energy savings.

Cooling capacity (unsteady): 30 - 70 W/m²
Tube diameter. 60 and 80 mm
Material: Aluminium
Heat transfer: up to 90%
Ceiling strength: 22 – 35 cm
Specific air flow rate: 6 - 7,5 m³/hm²