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Modern House

Capillary Heating and Cooling

A Healthier way to heat and cool your home

Capillery Heating
Capillary Cooling

Quiet Interiors install Capillary heating and cooling options for your home


Capillary Tube Mats are installed directly under the surface of one or several room enclosing surfaces – these can be the ceiling, the walls or the floor.

For heating or cooling spaces, warm or cold water flows through the very thin capillary tubes having outer diameters of 3.4 or 4.3 mm. The surfaces equipped with our mats are maintained at an even surface temperature. They ensure a quick dissipation of the cooling load or a quick supply of the heat requirement, mainly through radiation and partly through convection.

Due to the large exchange surfaces, considerable amounts of energy can be transferred draught-free and silent even at minor temperature differences between the active room surfaces and the room air.


For COOLING purposes, Capillary Tube Mats are preferentially installed either in or on the ceiling; in this case the surface temperature of the ceiling is, depending on the supply temperature, approx. 19 °C at only 2 to 3 K spreading between supply and return (supply temperature = usually 16 °C; return temperature = 18 °C or 19 °C). Depending on the type of ceiling or the way the capillary tube mats are installed, cooling capacities of up to 100 W/m² (Δ=10 K) can be achieved for closed radiant cooling ceilings.

Surface cooling systems bear the risk of dew point exceedance and of condensation on the cold surface. This risk can be safely ruled out! Therefore each control zone is equipped with one or several dew point sensors. To avoid condensation on the cooling surface, in case of a dew point risk the flow through the capillary tube mats is stopped by closing the control valve. Switching off the individual zones can be counteracted by using an enthalpy-based supply temperature control.

In large and intensively used office buildings cooling ceilings are often combined with a supporting ventilation system, so that dew point exceedance happens very rarely. This is necessary as a rule in order to provide all users with the required fresh air as well as to remove the bad air. The relative humidity is controlled by ventilation and maintained at a comfortable and dew point non-critical range for the users of approx. 50% relative humidity.

Due to the fact that the dissipation of the cooling loads, with this type of system combination, is performed by the cooling ceiling, the air change rate can be reduced to the hygienic minimum necessary (approx. two to three air changes per hour) and the size of the ventilation system can be considerably reduced.


For HEATING purposes, warm water with a temperature between 28 °C and 35 °C flows through the capillary tube system. In this case, the surface temperature of the ceilings is at approx. 27-30 °C. That way, even during the heating phase, the radiant energy from the user is transferred to the ceiling.

Studies have shown that, when the entire ceiling surface is activated, up to an output of approx. 60-70 W/m², depending on the symmetry in radiation, no losses of comfort are expected when heating by the ceiling.

Higher outputs can be achieved via the floor surface (100 W/m² according to DIN) and the wall surface (130 W/m²), with full comfort.

Due to their considerably larger surface, capillary tube mats are much more efficient than conventional systems. This is evident from the fact that they require substantially lower supply temperatures to obtain the same heating capacity. Therefore, our capillary tube technology is the ideal heat transfer system for heat pumps, whose coefficient of performance increases accordingly. Furthermore, capillary tube mats allow the realisation of extraordinary low installation heights. For floors e.g. it is possible to apply the capillary tube mats not only in the screed, but also in the thin-layer process directly under the floor covering.

In general, Heating and Cooling Systems are considerably more responsive than conventional systems due to the position and geometry of the capillary tubes.

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