Soft Ceiling Radiation for Cooling and Heating

Soft heating and cooling by the radiation from the ceiling also avoids any noise and draught feeling.

Water tubes are laid out in the concrete floor slabs and imbedded in the concrete. In this way they are very well protected. For heating water temperatures are used at 24 to 27°C and for cooling temperatures down to 18 to 20°C. Due to the dry air supplied, no condensation can be expected even in high summer. Power densities up to 30 W/m2 of heating and up to 40 W/m2 of cooling can thus be realized without problems. The radiation together with the inner surface temperatures very near to room air temperature create a very comfortable, draught-less well balanced indoor climate.

When the room is held at 20°C in winter with a supply temperature at 26°C, it becomes inertia-less and reacts immediately to changes, as sun shine. If the sun starts shining, the room temperature will rise and immediately the temperature difference between the water and the room will become smaller and therefore also the power supplied until 0 W/m2 at 26°C room temperature. Thus, if one allows a certain variation of the room temperature within the comfort range, the system behaves automatically and with no delay.

Due to the small differences of the supply temperatures to the environment, heat pumps can work very efficiently (power needed only about 1/5 to 1/7 of the power supplied) to produce the necessary heating and cooling power and can use the environment: ground water, earth as source.