Waste heat recovery from thermal water – Therme Wien
THERMA FLEX DEMO PROJECT: Use of waste heat from thermal water
This demo is part of the lead-project ThermaFLEX that has been completed. Download the ThermaFLEX Publishable Final Report here.
Objective of the ThermaFLEX project Waste heat recovery from thermal water – Therme Wien
The use of waste heat from different sources is an important building block for the decarbonisation of heating networks. The main objective of the demonstration was to utilise the waste heat stored in the thermal water after it has been used internally by the Therme Wien thermal spa in the Oberlaa district. In order to achieve this, the residual heat of the waste water, which is still around 30 degrees, was used.
Approach and methodology of the project ThermaFLEX Waste heat recovery from thermal water – Therme Wien
Two identical water-cooled compact heat pumps have been designed to supply approx. 2.2 MW of power at a temperature of up to 85°C to the heating network (secondary network) of the city of Vienna. An additional P2H system allows the temperature to be increased further if required (e.g. when the outside temperature is below -5°C). The system was installed in the underground car park of the thermal bath and connected to the city’s 20 kV electricity grid. Commissioning and a trial period were scheduled for early 2022. The innovative waste heat recovery system supplies heat to around 1,900 households and save 2,600 tonnes of CO₂ per year.
