Buildings are responsible for ~40% of energy consumption and 36% of CO2 emissions in the EU, making them the largest energy consumer in Europe. Currently, around 35% of EU buildings are over 50 years old and almost 75% of the building stock is energy efficient. Specific measures for the construction sector to decarbonise the building sector by 2050 should focus on nature-based solutions that ensure the insulation and shading of buildings, thereby helping to reduce energy demand by improving the energy performance of a building; exploring and testing new solutions to improve the energy performance of historic buildings; seeking high-efficiency alternative systems, where technically, functionally and economically feasible, while also addressing the issues of healthy indoor climate and fire safety. The delimiting element of the building, the main element separating the indoor from the outdoor space, is very important for the comfort and well-being of the buildings. This affects the requirements for heating and cooling services, while maintaining comfort, indoor air quality and safety.This project aims to address the challenges of energy-efficient sustainable building envelopes by developing a conceptually multifunctional aerogele system that will ensure simultaneous thermal insulation and uninterrupted thermal energy production and storage using the temperature difference between the exterior of the building and the interior. The system will consist of an environmentally friendly solid-state carbon and silicon dioxide aerogel based thermally rechargeable sodium ion battery, which is placed in a 3D printed housing with an embedded electrode system. Industrial research.The project is not related to economic activity.The project manager is Dr. Fiz. Jana AndzāneThe project will be implemented by three partners: University of Latvia (LU) and limited liability associations SIA 3D Strong and SIA VVRI. The project corresponds to the activity ‘Performing other research and experimental development in natural sciences and engineering’, NACE code 72.19, FORD broad classification code 2 (Engineering and technology), FORD second level classification codes 2.5, 2.10, 2.11.The project will make a significant contribution to the following areas of the National Research and Innovation Strategy for Smart Specialisation (RIS3):Joma No. 3 - Photonics and smart materials, technologies and engineering systemsJoma No. 4 - Smart energy and mobility. Developing innovative environment-friendly and circular economy supportive lightweight and cost-effective thermoelectric thermal insulation system solutions with electrochemical energy storage function for building envelopes will increase the energy efficiency of buildings and reduce annual thermal energy consumption. This will significantly contribute to the achievement of EU and Latvian targets for reducing overall energy consumption and CO2 emissions in order to transition to a climate neutral economy. In addition, the developed battery components (electrodes, polymer electrolyte) can be used in environmentally friendly, efficient, safe, lightweight and recyclable Na-ion rechargeable batteries.In the implementation of the project will be involved at least 3 students, who will be employed with a load of 0.45-0.5 of normal working time per month for the entire duration of the project, which is approximately 35% of the total employment of the project staff. The competence of students, doctoral students and young researchers involved in the project will increase. Renewed academic staff will improve the quality of studies and research and thus attract new students and additional funding for science. Project partners will gain new knowledge and competences in the niche of thermoelectrics, energy-efficient buildings, safe and environmentally friendly solid-state sodium ion batteries, renewable energy sources and circular economy, as well as gain or expand experience in cooperation with research institutions.The project is divided into 5 basic activities:1. Development and characterisation of internal system components (carbon and silica aerogels and thermoionic polymer electrolyte);2. Development of non-conductive and electrically conductive 3D printing materials;3. System body modelling and 3D printing with embedded contact and power collector electrode system;4. Development and characterisation of prototypes of small (single) and large (multi-leg) scale systems.5. Project management and dissemination of project results.During the project it is planned to reach the technology readiness level TRL 4.The planned results of the project are: 4 original scientific publications submitted for publication in high-level peer-reviewed scientific journals; 1 Latvian patent application filed; 6 new technological instructions; 2 prototypes of new products (thermoelectric thermal insulation systems with the possibility of energy storage and storage), presentation of project results at 8 international confe