Vienna, Austria
The overall system was developed to utilise the waste heat of the thermal (waste)water of “Spa Vienna” located in district “Oberlaa”. The system based on heat pumps with a supply of about 2,2 MW to the DH network of the City, depending on the temperature and the mass flow of the source. The heat pumps are designed to get a maximum output temperature of 84 °C. An additional electrical boiler of 375 kW thermal energy increases the temperature up to 90 °C if the outdoor temperature is below -5 °C. Yearly produced heat amounts to around 11 GWh.