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The energy needed for Domestic Hot Water (DHW) represents an important share in the total energy use of well-insulated and airtight buildings. One of the main reasons for this high energy demand is that DHWis produced at temperatures above 60°C to mitigate the risk of contaminating the hot water system with Legionellapneumophila. However, this elevated temperature is not necessary for most DHWapplications, and has a negative effect on the efficiency of hot water production units. A Modelica simulation model has been developed thatproposes an alternative to this constant 60°C by predicting the L.pneumophilaconcentration dynamically throughout the DHWsystem. Based on this knowledge, the topic of this paper is coupling the simulation model with a virtual DHWcontroller prototype. The DHWcontroller sets a comfortable DHWset point temperature in combination with heat shocks. The simulation model algorithm predicts the concentration of L. pneumophila present in the system, as this concentration cannot be measured in real time. When this predicted concentration passes a predefined threshold level, the controller will increase the set point temperature of the boiler (heat shock) in order to lower the concentration of L. pneumophilapresent until the predicted concentration is below a predefined boundary level.The energy savings by implementing the heat shock regime instead of the constant 60°C regime can be predicted with the simulation model.This new DHWcontroller is expected to become an important alternative for the current, energy intensive, constant high temperature tap water heating systems.

Coupling of Modelica Domestic Hot Water Simulation Model with Controller