Experimental house EB2020 – Research and experimental measurements of an energy roof

Abstract

The paper focuses on the experience with research of combined building-energy systems such as energy roofs, ground heat storage and active thermal protection. The EB2020 experimental house was largely designed in accordance with the patented ISOMAX system (SK 284 751, author: Dipl.-Ing., Phys. Edmond D. KRECKÉ), which represents a high potential for the use of renewable energy sources. When designing the experimental house EB2020, we eliminated the problem of this system by designing top heat sources, whose heat sources are exclusively solar and geothermic energy. The investigated building is designed with the following heat sources and energy systems: energy roof, low-temperature gas boiler, fireplace with hot water exchanger, ground heat storage, storage water heat storage with electric reheating, active thermal protection, large-area radiant low-temperature heating / high-temperature cooling, liquid cooling circuit in the ground outside the building, recuperative air handling unit and air ground heat exchanger. In this paper we describe the theoretical procedure for calculating the efficiency of the energy roof, comparison with a classic solar collector, experimental measurements of the energy roof during one season and evaluation of the measured data. The application of an energy roof requires lower investment costs than conventional solar collectors, but experimental measurements have shown that the energy gain and the achieved temperatures of the working substance at the outlet are significantly lower. For higher efficiency energy roof, it is worth considering installing a dark roofing and installing more circuits with a suitable orientation according to cardinal directions. This may be the subject of further research.