The HUBER Heat Exchanger RoWin plays a key role in heat recovery. It recovers 50% of the waste heat from wastewater, which has a temperature of about 23°C, from the huge amount of water required for the kitchen and especially the wellness area. The wastewater is discharged into the sewerage system with a temperature of approx. 10°C. With over 15%, the contribution of the wastewater heat to the total heat requirement of the hotel complex is very significant and contributes to an important CO2 reduction.
The entire installation for waste heat recovery with the HUBER Heat Exchanger RoWin is located in the technical equipment room and is an encapsulated, odourless installation. The plant is accessible at any time and operation is fully automatic. Before the wastewater is fed to the RoWin heat exchanger, it is pre-screened with a 6 mm perforated screen (modified HUBER Wash Press WAP® 4).
In the Valsana project, only the hotel’s own wastewater is used, the public sewerage system is not used for heating purposes. This example clearly shows that even with low wastewater flows of 1 litre per second on average, the HUBER Heat Exchanger RoWin can be applied successfully. For optimum heat yield, batch operation was implemented in the project.
The HUBER Heat Exchanger RoWin is suitable for new construction projects and for the rehabilitation of existing heat generation plants. In combination with alternative energy systems, this technology can be used to tap a significant, previously unused energy source.
Many thanks go to the owner of the Valsana (www.valsana.ch), the Tschuggen Hotel Group, the energy planner Broenner AG (www.broenner.ch) and to all those involved who made it possible that this pioneering project could become reality.