Research & development of the C+P climate wall

Ecological and innovative building climate control using chilled water film

In collaboration with researchers at the Fraunhofer Institute for Building Physics IBP, we developed, with the patented climate wall, a future-oriented and healthy panel cooling system which eliminates the negative aspects of air conditioning, combines the functions of different cooling systems, and avoids the limited functions of conventional panel cooling systems.

Comparison of a climate wall with conventional cooling systems

In buildings, air conditioning systems create a defined indoor climate with regard to air quality, temperature, and humidity. Usually dry and cold air is blown into the rooms, which can lead to unpleasant consequences for the user. Unpleasant air drafts in the room are accompanied by additional noise pollution. Moreover, excessive room cooling often occurs in countries with hot humid climates, because the air conditioner is regulated according to the – very high – dehumidification requirement and not according to the prevailing temperature.

Large cooling elements such as cooling ceilings are regarded as established alternatives to air conditioners. Their double effect makes them very efficient: the circulating air is cooled, and at the same time a sink is created for long-wave radiation of objects and people in the room. In addition, cooling elements operate completely silently and without unpleasant air drafts. Their limited cooling capacity, however, is a big disadvantage. To prevent mold formation, the surface temperature of a cooling ceiling must be much higher than the dew point of the indoor air. As a result, surface humidity is somewhat under 80 % of the relative humidity so that the cooling temperature of the element is limited. Moreover, cooling ceilings are totally unsuitable for dehumidifying indoor air because condensation of water in the air has to be prevented systematically.

Function of the energy-saving climate wall

Cooled water is circulated over the vertical glass wall of the climate wall, creating a smooth liquid film on the surface. Alternatively, surface cooling can be carried out using a secondary cooling circuit.

The temperature of the cooling liquid is regulated by a cooling unit outside the room, similar to the method used for every active cooling technology.

Compared to a cooling ceiling, the temperatures of the climate walls can also be adjusted below the dew point. In addition to achieving effective radiative cooling, this technology also enables dehumidification of indoor air. If the temperature of the water film is below the dew-point temperature of the indoor air, the indoor air humidity condenses on the water film and is drained off with it into the catch basin. Excess water drains off via a spillway and can be collected for reuse, if desired. Even if the air temperatures in the room are a few degrees above the usual comfort range, they are still perceived as pleasant thanks to the long-wave radiation exchange with the cooled surface of the climate wall and the reduced indoor air humidity. This ensures efficient and sustainable climate control.

Application areas for climate walls

The biggest advantage of the climate wall is the possibility of zonal climate control: defined areas of a room occupied by people can be air-conditioned selectively, while the remaining zones remain unconditioned. This makes it possible to save valuable energy, for example in open space offices, production buildings, or high production halls.

In buildings without air conditioning, a cooling fountain also functions as a pleasant place to rest and relax for the users. During the summer heat, the cooled water film serves as a natural source of relaxation. Such recreational areas also increase the attractiveness of e.g. fitness studios, spa areas, shopping malls, or other leisure facilities. As a natural element, water radiates vitality and freshness, bringing the human body and mind into balance.

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