This project is supported by the European Commission under the H2020 Framework Programme N.767180
The ‘ENVISION’ concept consists of a fourfold approach:
1. Development and demonstration of efficient solar-radiation absorbing façade elements
ENVISION will develop aesthetic pleasant technologies for the energy harvesting in facades by using the invisible part (NIR) of the solar spectrum, which represent the 50% of the total solar radiation. Besides the harvesting heat technologies, novel integrated PV solutions for glasses with reduced shading effects will be implemented. The integral ENVISION approach will also include the usage of the building roof surfaces for the installation of standard PV(-T) solutions.
2. Development of a flexible harvesting façade concept consisting of modular elements
Implementation, installation time and/or investment costs are the key showstoppers towards the development of nearly-zero-energy buildings (NZEB) or energy positive buildings. Therefore, the ‘ENVISION’ project will develop modular, easy to install façade elements provided with a click on positioning system and the transparent harvesting elements will be designed in a way that the different glazing solutions can be fitted in easily as well.
3. Integration and interaction of the energy harvesting technologies with district networks
To efficiently use the ENVISION energy harvesting building skin, an adaptive, model-based energy control system will be developed enabling the interaction among the different energy systems at both building and district network levels.
The control system at the building level will have three major features ensuring the highest energy performance: 1) it will act based on the model-based response behaviour of each module, 2) it will relate to the response function of the building, 3) it will take into account the weather predictions. In addition, a direct link with the end users will be implemented, allowing the building occupants to interact with the energy harvesting systems in a simple and effective way, thus increasing their awareness of their prosumers role.
The control system at district level will be optimised through a dedicated real-time management tool performing also thermo economic analyses. The tool will operate the available generators as a function of the actual requests and of the energy price evolution, together with other boundary conditions, in order to satisfy local energy demands.
4. Demonstration and validation of the ENVISION technologies will take place at different stages through the project in order to ensure effective development.
At TRL 5 we focus on testing separate façade components in the laboratory environment, such as the collector functions of the aesthetic coloured façade collectors, the performance of the ventilated glass, and PV glazing. At TRL 6, we focus on one real case-study of subsystem prototypes (façade element) at the SOLAR-Beat of TNO/SEAC.
At TRL 7, the full façade will be demonstrated at the BESTlabs of EDF, where the systems will be demonstrated in an operational environment.
Finally, in two major renovation sites the technologies will be tested to study the link to the district network and the grid connection, and in a real case study of a renovation action.