InDeWaG is the acronym of title "Industrial Development of Water Flow Glazing Systems" - Innovation action project funded under Horizon 2020, a Public Private Partnership on "BUILDINGS DESIGN FOR NEW HIGHLY ENERGY PERFORMING BUILDINGS". Support for innovation is provided to actions where partners focus together and join forces to remove existing barriers through market uptake measures in order to build capacity and provide support for sustainable energy policy implementation. Their mission is to foster sustainable energy investments and the uptake of technologies relevant to energy efficiency in buildings.

InDeWaG establish new technical knowledge and explore the concept of a new improved technology and product. Demonstration activity will show technical feasibility in a near to operational environment. InDeWag project introduce a new, disruptive building envelope system which has at least 15% building cost reduction potential and could be brought to industrial ripeness. The unique approach of InDeWaG is to enable maximum use of daylight by a transparent glass façade and at the same time meet nZEB performance. The consortium will undertake a quantitative analysis of different "modular" approaches: the active fluid flow glazing will combine water as heat transfer media with compressed air and solar-thermal energy conversion with BIPV (Building Integrated Photovoltaic), to enable the optimal ZEB performance for a multitude of building types in different climates.


The ambition of InDeWaG project is to bring to industrial ripeness a façade and interior wall system based on radiant heating and cooling glass surfaces made from water and/or air flow glazing, abbreviated as WFG and AFG, which harvests solar energy for various use at large scale. Such building elements will be made ready for commercial application in the building sector and will be designed to become easy adoptable for 21st century façade and overall building technology, especially for cost effective ZEB technology with increased daylight use, variable ventilation and individual control comfort. The benefits of fluid flow glazing façade technology were proven over the past 8 years on the level of few demonstrator projects, but there are still many difficulties for the right practical implementation.

The concept for extending the State of Art in water flow glass façade systems is oriented towards a system that will be able to satisfy the cooling requirements and the hot water needs for a whole building. This is achieved through the integration of a series of transparent, translucent or opaque solar thermal absorbers which operate at different nominal temperatures, namely 30ºC for heating and seasonal energy storage, 60ºC for sanitary hot water supply and 90ºC for cooling through absorption chillers. In this way, a complete glass curtain wall façade will be able to deliver all the levels of thermal energy required by a building while retaining its architectural aesthetics. In addition, implementation of radiant surfaces inside the building will be investigated by building simulation with IDA ICE and TRNSYS. The components will be tested in Demonstrators situated in two different climate zones - Bulgaria and Spain.

A proven design method, a tested and certified façade system unit, application possibilities and a focused market analysis are crucial for the fast market uptake of the Fluid Flow Glazing. The industrial development of this exciting façade technology is the main goal of InDeWaG consortium, enabling an important step forward towards achieving nZEB standard /stated by the 2020 EU policy in the Directive 31 from May 19th 2010/.



The main objective of InDeWaG is to develop an industrial technology for fabrication of cost affordable general-purpose Fluid Flow Glazing façade elements, which give maximum daylight utilization and maximum interior comfort at energy consumption level of nZEB. In addition, also interior radiant elements will be developed. This technical development is accompanied by the development of an open access software tool for design of buildings with this new type of façade and interior radiant cooling and heating elements.

The cost reduction of at least 15% is achieved by following the LowExergy9 principle and adjustment of the temperature difference between the exterior environment and the interior to a minimum value which is relevant for significant reduction of HVAC energy demand and lighting energy consumption.

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InDeWaG Partners

Universität Bayreuth (UBT)

The coordination institution (University of Bayreuth, UBT) has an excellent reputation as a foremost academic institution with many prestigious awards. UBT is among the Top Ten of the Humboldt Foundation ranking list and 2nd place in Germany and the 40 rank worldwide in Times Higher Education ranking list of 100 best "young" Universities. Researchers at UBT have a huge experience in leading and managing collaborative national and international research projects such as the proposed InDeWaG project.

Contact person: Prof. Dr.-Ing. Dieter Brüggemann

Bollinger & Grohmann Consulting GmbH (B+G)

Bollinger + Grohmann Consulting GmbH as a large industry partner contributes to InDeWag with their long-standing experience in energy efficient buildings design, structural and facade engineering, building physics and engineering and consulting for energy efficient and sustainable buildings.

Contact person: Prof.Dr.-Ing. Daniel Pfanner

ETEM Bulgaria AD (ETEM)

Industry partner ETEM complements the industry participation in the project with their experience in designing façade systems which are cost effective, user friendly and ready for mass production. Their main contribution in the project will be the set up of technical requirements for the system solution, the design and production of the aluminium profiles for the façade system as well as active involvement in the business cases and market uptake.

Contact person: Dipl. Eng. Veneta Novakova


The SME HTCO as a leading engineering company in the field of fluid flow and heat transfer simulation will be responsible for the development and optimization of the geometrical design and physical performance of the active solar multi-layered facades.

Contact person: Dr. Axel Müller

Savior Venture Capital (GMAE Transforma S.L.) (SVC)

The SME Savior Venture Capital - SVC was founded in 2008 by an ex McKinsey engagement manager to strengthen companies' competencies in industrial processes and help disruptive technologies become business by devising sound business models. In 2015 SVC took over IntelliGlass operations in active glazing technology. The company aims to end the research phase and market the technology.

Contact person: Dr. Antonio Manzanera

Fraunhofer Institut für Solare Energieforschung (Fraunhofer)

For testing and measuring the fluid glass facades, the large research organisation Fraunhofer will provide their cutting-edge test facilities, e.g. to investigate transmittance, reflectance, energy performance, accelerated as well as outdoor exposure tests to assess the reliability of the proposed materials and of demonstrators. Furthermore, they will mainly contribute to Life Cycle Environmental Assessment LCEA as well as Cost and Market Analysis.

Contact person: Dr. Christoph Maurer

Polytechnic University of Madrid (UPM)

Universidad Politecnica de Madrid (UPM) is a public university in Madrid area that comprises Engineering and Architecture Faculties. UPM Members hold patents related to Building Energy Management. They have developed devices and systems to monitor and to reduce energy consumption in buildings. UPM's laboratory is equipped with all the necessary facilities to perform measurements and reports related to Thermal Energy, Acoustic Properties and Electric Consumption.

Contact person: Dr. Juan A. Hernández

Cerviglas S.L. (CV)

To complete the consortium, the SME Cerviglas will be responsible for the production and technical advice of glasses and prototypes for the InDeWaG facades. With more than 30 years experience in the design and development of facade glass projects, the company plays a major role in the consortium, especially for technological advice and anticipating marked demands.

Contact person: Mr. Carles Almela

Architectonika (ARCH)

The architectural bureau and SME Architectonika with its focus on energy efficient building solutions contributes to the project with architectural design aspects and applications, the impact on architectural aesthetic and forms as well as daylight/artificial light aspects. They will closely collaborate with the industry partners to work on a solution for the multilayer façade system and the integration with other building systems.

Contact person: Arch. Dimitar Paskalev

Central Laboratory for Solar Energy and New Energy Sources (CL SENES)

The Central Laboratory of Solar Energy and New Energy Sources (CL SENES) as a research institution in Bulgaria is focused in doing primarily fundamental and applied research in the field of renewable energy sources and in particular solar energy. They will contribute strongly to the project regarding the Bulgarian demonstration site.

Contact person: Assoc. Prof. Dr. Miglena Nikolaeva-Dimitrova