StoWaDim-WRG – Efficiency and Storage Sizing with Shower Water Heat Recovery

The potential energy savings and the reduction in storage volume depend heavily on three different installation configurations, which are distinguished accordingly in the report. The heat recovery system can either preheat only the cold water for the shower, only the cold water entering the storage tank, or both simultaneously.

However, actual operational efficiency is influenced by numerous other parameters, such as heat losses in the shower cabin, the thermal mass of the unit, or efficiency losses due to fouling. The SPF Institute for Solar Technology conducts dynamic simulations using stochastic load profiles and can calculate these influences. This enables precise, property-specific sizing of the domestic hot water storage tank and recommendations for heat recovery system installation that also take hygiene requirements into account. The project was co-funded by the Swiss Federal Office of Energy (SFOE) and supported by the Lucerne University of Applied Sciences and Arts (HSLU).

Contact: Alexander Schmitt