Heating and cooling with lake water.

We are quite proud of the Seehotel’s facade which towers skywards above the Kaiserstrand like an icon And is, of course protected by a preservation order, which means that renovation and the addition of insulation to the facade is out of the question. Tricky! But not insoluble as a lake water utilization system now provides sufficient energy for heating (using a heat pump) and cooling (direct cooling). Water with a temperature of approximately 7 °C is extracted from the lake at a distance of 160 meters from the shore and a depth of 35 meters, and conveyed via a pumping station to the building services room where it is fed into a heat exchanger. The heat exchanger extracts both heat and cold from the lake water and supplies our building with energy. The water is finally returned to the lake at a depth of 25 meters and with a maximum temperature difference of 3 °C.

It goes without saying that the plant meets the strict protection targets of the Austrian Water Act and the Lake Constance Guidelines. But above all, it avoids the generation of 190,000 kg of CO₂, the consumption of 99,500 m³ of natural gas and 22,000 kWh of electricity every year. Thanks to water!