Cooling radiant water capillary cooling technology

About Capillary Tube Mats:

Capillary tube mat can be used for heating/cooling in the building to replace the conventional radiator heating and air conditioning systems. With the advantages of large exchange surface, uniform and constant heating, It also can be used in agricultural greenhouse. In addition, it can be embedded in the soil or installed in the tunnel as the energy collection device.

To heat or cool rooms, hot or cold water runs through the capillary tube mats system to exchange heat with the space air by radiation. They ensure a quick dissipation of the cooling load or a quick supply of the heat requirement. Due to the large exchange surfaces, large energy quantities can be transmitted with low temperature differences between the active room surface and the room air.

Capillary Mats Parameters

Application

 Ceiling with plaster – heating/cooling;

Metal ceiling panels – heating/cooling;

Ceilings with plasterboard finish – heating/cooling;

Incorporation of water capillary mats in concrete and reinforced concrete ceiling panels – heating/cooling;

Walls with plaster or plasterboard finish –heating/cooling;

Floor heating;

Groundwater geothermal collectors;

Non-standard use (use in greenhouses, swimming pools, various surface heating/cooling)

For COOLING purposes

• Radiant cooling ceilings (with plaster, lined with plasterboard or metal panels) and built-in water capillary mats connected to a single system, contain cooled water at a temperature of +16–17°C.
• A ceiling panel acts as a heat exchange element between the indoor air and cooled water in the water capillary mats.
• The ceiling absorbs heat from the heat sources in the room, exchanging the circulating cooled water.
• The circulating water is continuously pumped to the chiller, cooled and pumped back to the ceiling through the water capillary mats.

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.