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Minimal Size Thermal and Electrical Energy Storage System for In-Situ Residential Installation

Periodic Reporting for period 1 - MiniStor (Minimal Size Thermal and Electrical Energy Storage System for In-Situ Residential Installation)

Reporting period: 2019-11-01 to 2021-04-30

The EU building stock has large potential to increase its energy efficiency with solutions that can be integrated to existing dwellings and through different measures. One of them is optimizing the use and management of thermal energy by allowing it to be stored, levelling demand peaks and increasing use of renewables affected by intermittency such as solar-based heating. This will help decarbonize the generation of heat and help achieve overall national targets to offset climate change.
The MiniStor project aims at designing and producing a novel compact integrated thermal storage based on thermochemical materials to achieve sustainable heating, cooling and electricity storage that can be adapted to existing systems in residential buildings. It is based on a reaction of calcium chloride and ammonia, combined with parallel hot and cold phase-change materials for flexibility and usage year-round. It also stores electrical energy in a lithium-ion battery that responds to grid signals and can sell to the electrical grid. The system is managed by a smart Home Energy Management System (HEMS) that connects to the Internet of Things (IoT).
The system can have as input energy obtained from a variety of renewable energy sources such as hybrid photovoltaic thermal panels that collect both electricity and heat from the sun. This arrangement is demonstrated and validated in four demonstration sites (Ireland, France, Greece and Hungary), testing its effectiveness at different local climatic conditions and facilitating market replication.
As an overview, at M18 the Consortium has reached a very advanced design of the system, which can allow manufacture and subsequent deployment of the prototypes to the demonstration sites. The photovoltaic thermal (PVT) panels are very close to final manufacture and delivery. Demonstration sites, except for Santiago de Compostela, have completed the installation of monitoring works and these systems are functional. Control systems are in an advanced design stage and need the manufacture phase to verify the control propositions. A methodology for exploitation and commercialization studies has been laid out, with initial exploitable products detailed. Dissemination strategies have been devised and activities such as launch of project website and social media accounts have been performed. Engagement with other similar projects is starting. Initial market analysis has been performed, with the identification of exploitable results and the first exploitation workshop. In terms of communication, social media channels and the MiniStor website have been setup and are running.
During the first reporting period, the project has progressed beyond the state of the art through establishing an initial analysis of the situation where thermochemical heat storage can be applied. It also has determined a complete set of calculations and design specifications for a heat and electrical energy storage system that can be applied in the project demonstration sites. A monitoring system that can take data from different platforms is also established.
Expected results until the end of the project include working prototypes being demonstrated in the selected sites. Potential impacts include reduction of energy consumption for both thermal and electrical energy, and higher user satisfaction from demo site users due to better control of their built environment and indoor air quality. This can provide the basis for further development of the system.
Schematic explanation of how the thermal storage works