Autonomous energy supply
The system does not come into contact with water, but rather draws its energy chiefly from the temperature differences in the environment, for example between a water or wastewater main and the earth. In one variation, highly efficient solar cells are used. This energy harvesting enables devices above and below ground to be used in the water infrastructure. “Energy harvesting based on temperature differences is, to be sure, less efficient than solar energy, but it can be put to use nearly everywhere,” explains project leader Marcel Meli of the ZHAW Institute of Embedded Systems. “The combination of various heat sources – depending on location and season – assures a continuous energy supply.” Using this method, the system can acquire the needed power even deep within the earth.
Successful field tests
The system is already in use at Eawag’s demonstration site as well as in Winterthur’s municipal utilities, which have placed their infrastructure at the researchers’ disposal. The research team has shown everywhere that ADAWIM can supply enough energy within the water infrastructure to measure parameters like water flow or soil moisture. The data gathered are prepared locally and sent to a gateway by wireless transmission. This then transmits the information – in real time or at a later time – to a server for further preparation and visualisation.
Invitation to Brussels
As part of the “Zero Power Water Prize” of the EU research programme Horizon 2020, Marcel Meli and his team were able to demonstrate the ADAWIM solution in Brussels as one of five finalists in the competition. Now that the demonstration of the system prototype in the operating environment has proved so successful, the researchers want to find a business partner so that they can move on to the next stage of their smart-sensor solution: the development of a marketable product.