ENERGETIC BEHAVIOUR OF A SOLAR THERMAL SYSTEM PRODUCING DOMESTIC HOT WATER AND PREHEATING THE VENTILATION AIR

摘要

As a result of the evolution of the thermal regulation in Europe, buildings are better isolated and more airtight, therebyreducing their heating needs. Efficient systems from the energetic point of view, using preferably renewable sources,must cover the new distribution of needs. Indeed, domestic hot water (DHW) becomes a more important load thanspace heating in residential buildings. In this context, solar thermal systems are appropriate for supplying a significantpart of the heat demand in energy efficient housing. Thus, this paper focuses on an innovative solar thermal systemproducing DHW and preheating the ventilation air. A co-simulation between Dymola (Modelica language) andEnergyPlus forecasts the energy performance of the system in a low-energy individual house for different Frenchcities. The results show an improved collector efficiency as well as a higher solar productivity in comparison to aclassical solar domestic hot water system. Although energy savings are achieved for the majority of the studiedclimates with the studied system, a different control strategy may be interesting in order to improve the distributionof the collected solar energy. To this end, a parametric analysis provides some clues for increasing the energyperformance of the innovative system when modifying the design and control parameters.