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.

About Vision News Events Partners Internal

InDeWaG Events

SEPTEMBER 25 - 26 2019

'Science is Wonderful!’ exhibition

Science is Wonderful! is an exhibition in the frame of the European Research & Industry Days 2019. Being free and open to everyone, this event gives you the chance to meet researchers from InDeWaG chatting out of the box and demonstrating purpose and functionality of the technology developed within the project.

In case you ever had questions about what we are doing, this might be your best opportunity.

Venue: Brussels, Belgium.

JUNE 10 - 12 2019

European Conference on Renewable Energy Systems

Venue: Madrid, Spain.

ECRES brings together researchers, engineers and natural scientists from all over the world, interested in the advances of all branches of renewable energy systems.

FEBRUARY 05 - 06 2019

2019 EU Industry Days

Venue:Brussels, Belgium (The Egg Congress & Meeting Centre).

The 2019 EU Industry Days will take place on 5-6 February 2019 in Brussels. The European Commission is an organizer of this event which thematic areas are: industry and sustainability, industry and globalization, innovation and digitalization.

University of Bayreuth (UBT) is going to present InDeWaG on the EU Industry Days 2019 by taking part in the exhibition.


World Sustainable Energy Days, 27 Feb-01 Mar 2019

“The World Sustainable Energy Days” attracts more than 600 delegates from over 50 countries from business, public sector, and the research community. It features policies, technologies, innovation and market development through unique combination of conferences and interactive events.

Venue: Wels, Austria.

MAY 15 - 17 2019

Intersolar 2019

Venue: Munich, Germany.

Intersolar Europe is the world's leading trade fair for the solar industry and its partners. The exhibition and the conference focus on the areas of photovoltaics, solar thermal energy, solar power plants, solutions for the integration of renewable energies.

OCTOBER 25 - 26, 2018

Engineered Transparency, International Conference at Glasstec

Venue: Düsseldorf, Germany.

The conference is focused on current developments in façade construction. Main topics are buildings and projects, energy and sustainability, design and construction, research and development of structural glazing. The program is followed by “glass technology live exhibition area”.

In the conference session: Façade – Architectural Design, Prof. Dr. Eng. Daniel Pfanner (Bollinger + Grohmann) gave a presentation titled: "A new building envelope – increasing daylight and energy efficiency with water flow glazing".

Paper in Book publication “Schneider, Jens/Weller, Bernhard (Hrsg.), Engineered Transparency 2018 Glass in Architecture and Structural Engineering, November 2018, ISBN: 978-3-433-03269-5”.

OCTOBER 1-2, 2018

13th Conference on Advanced Building Skins

Venue: Bern, Switzerland.

The Conference is an international platform for scientists, engineers, architects, industry. It is initiated to pay attention to the importance of building skins in total energy consumption within buildings. The aim is putting scientific know-how into practice and strengthen the dialogue between science and industry.

Prof. Dr.-Ing. Daniel Pfanner (Bollinger + Grohmann) delivered a keynote lecture at the Conference and spread the knowledge of InDeWaG. In Session: Dynamic Glazing for Sustainable Building Skins, he gave presentation titled: “Fluid flow glazing façades – future potential in building industries”.

Paper in Book publication “13th Conference on Advanced Building Skins, 1-2 October 2018, Bern, Switzerland, ISBN 978-3-9524883-4-8”.

SEPTEMBER 25-26, 2018

Workshops on Energy Efficiency topic (Project Young Energy Europe )

“Young Energy Europe” enables young professionals in Bulgaria, Czech Republic, Greece and Hungary to extend their education in the fields of energy and resource efficiency.

An interesting information was presented during the seminars by Milan Rashevski (Architectonika) who shared the knowledge about InDeWaG and the Demonstrational pavilion with Water Flow Glazings which will be set up in Bulgaria. There are a few existing buildings till now - in Spain and Qatar. The WFG system is a cutting edge technology aiming to industrial ripeness.

Venue: Plovdiv & Sofia, Bulgaria

SEPTEMBER 24-28, 2018


The European Photovoltaic Solar Energy Conference (EU PVSEC) is the largest international Conference for Photovoltaic research, applications and technologies. At the same time it serves as a top international PV exhibition and a platform.

On behalf of Fraunhofer ISE, Dr. Eng. Christoph Maurer participated in the Conference and in his presentation he also mentioned the general characteristics of the Water Flow Glazing Systems - energy performance, solar thermal behaviour, aesthetic qualities, sustainability.

Venue: Brussels, Belgium

SEPTEMBER 19-21, 2018

IEA SHC Task 56 - 6th Experts Meeting

“The 6th Task 56 Experts meeting” was arranged by the Centre for Zero Energy Building Studies at Concordia University. 22 experts from 10 research institutions and 4 companies participated at the event. Central topic in the Meeting was “Integration of Solar Envelope solutions into the building’s HVAC and lighting systems through a systemic approach”.

With regard to a subtask in the Meeting “Apllications, case studies” in a thematic area “Solar thermal façade systems – An interdisciplinary approach”, Dr.-Ing. Christoph Maurer (Fraunhofer ISE) participated with a presentation.

Venue: Concordia University, Montreal, Canada

AUGUST 26-30, 2018


Venue: Inter Expo Center (IEC), Sofia, Bulgaria

On 28 AUGUST 2018, in Conference Section 13:”Alternative Sources of Energy”, InDeWaG project was disseminated among the scientific audience on behalf of CL SENES. Eng. PhD Plamen Ivanov gave a presentation titled “New generation nZEB – demonstrational pavilion with Water Flow Glazing and roof mounted PV system”. The report gave an overview of the InDeWaG objectives, results and next steps. A special attention was paid to the simulation IDA ICE software with additional modules that can calculate the dynamic thermal behaviour of the WFG. Simulation overview and results - Annual Behaviour of WFG were presented.

A publication with title: New generation nZEB – demonstrational pavilion with Water Flow Glazing and roof mounted PV system, authors: Miglena Nikolaeva-Dimitrova, Maya Stoyanova, Plamen Ivanov, Kalina Tchonkova, Rumen Stoykov is accepted in the Conference proceedings which are published in a Special Volume of the AIP Conference Proceedings. The American Institute of Physics (AIP) Conference Series is a very well-known series of Conference Proceedings, which is included in the leading databases of scientific & engineering literature.

JUNE 18-19, 2018

SEES'18 International Conference on Sustainable Energy and Environment Sensing

Venue: Fitzwilliam College, University of Cambridge, United Kingdom.

The conference was aimed to both academic and industrial communities. New trends and challenges, emerging technologies in the field of Sustainable Energy and Environment Sensing were the topics of the event.

UPM-ETSIAE participated in the conference with a paper titled "The use of Water Flow Glazing with variable g value in Net Zero Energy residential and office buildings". Authors: Del Ama Gonzalo F., Moreno, B., Hernandez J.A. (2018)

JUNE 13-16, 2018

C4E Forum 2018 Central & Eastern European Energy Efficiency Forum

Venue: Serock, Poland.

C4E Forum 2018 aims to present many interesting projects in the field of energy efficiency, policies and programmes in the region of Central and Eastern Europe. Capacity building, Innovation in the building sector, Multiple benefits of energy efficiency, Role of buildings in the energy system are some of the key topics of the Forum.

Dipl. Eng. Veneta Novakova (ETEM) introduced to the participants in this community-building event the perspective of InDeWaG in her presentation titled “Light, Glass and Water in the Future Building Envelope”.

MAY 24-25, 2018

2nd Annual Advanced Materials in Construction Summit

Venue: Berlin, Germany.

The 2nd Annual Advanced Materials in Construction Summit brings together professionals in the construction industry to exchange practice and ideas in the current developments and future trends in advanced construction materials.

The Group R&D Director Veneta Novakova (ETEM) participated in the Summit as one of the key speakers. She gave an overall presentation titled “Light, Glass and Water in the Future Building Envelope”, disseminating the innovative approach, objectives and results of InDeWaG project.

MAY 24-25, 2018


The topics at this year’s Glasbau Conference enhanced a comprehensive overview of current issues in structural glass construction. The speakers presented up-to-date research and development results as well as the design and planning processes of outstanding projects.

Prof. Dr.-Ing. Daniel Pfanner (Bollinger + Grohmann) disseminated InDeWaG project results and participated with a keynote lecture: “The Dream of Light – Daylight, Transparency and Energy Efficiency through Fluid Flow Glazing”.

The yearbook “GLASBAU 2018” was published for the conference. It covers all major developments in the field of structural glass construction and facade technology.

Venue: TU Dresden, Germany.

Paper in Book Publication: Weller, Bernhard / Tasche, Silke: Glasbau 2018, April 2018, 414 Seiten, ISBN: 978-3-433-03212-1.

MAY 14 - 15, 2018


Venue: Plovdiv, Bulgaria

First International Scientific Conference ALTERNATIVE ENERGY SOURCES, MATERIALS AND TECHNOLOGIES (AESMT’18) took place in Plovdiv, Bulgaria. Prof. Miglena Nikolaeva-Dimitrova (CL SENES - BAS) was a member of the Scientific Committee. The main topics were: Alternative Energy Sources (Solar and Hybrid Thermal Systems, Solar Photovoltaic Systems, Energy efficiency, etc.), Alternative Materials and Alternative Technologies.

In Parallel Session “Solar and Hybrid Thermal Systems”, Kalina Tchonkova (CL SENES) presented a paper titled “Investigation of thermal behaviour of innovative Water Flow Glazing modular unit” with authors of the publication: M. Nikolaeva-Dimitrova, M. Stoyanova, Pl. Ivanov, K. Tchonkova, R. Stoykov. In this paper the participants from CL SENES – BAS investigate the thermal behaviour of WFG.

The publication is accepted in the Conference proceedings. The reports delivered in the conference will be published after peer-review in Open Access journals with Impact Factor.

APRIL 24, 2018

Congress: The Fascination of the Building Envelope - Function, Material, Aesthetics

Venue: Cologne, Germany

This Architectural Congress gave an insight of latest technologies and innovations, as well as exemplary case studies were presented and discussed during the event.

Prof. Dr.-Ing. Daniel Pfanner (Bollinger + Grohmann) participated in the congress as a renowned expert and speaker. He gave a keynote lecture titled: “Glass, Light, Solar shading – Innovation in Planning and Construction of Building Envelopes”, also introducing the InDeWaG project achievement so far.

FEBRUARY 22, 2018

Architects and Planner Congress: FASSADE 2018 — smart green dynamic , at the Fair BAUTEC in Berlin, Germany

Venue: Berlin, Germany

Two independent lectures by Daniel Pfanner from Bollinger+Grohmann and Teodora Vatahska and Dr. Axel Müller from HTCO GmbH

At one of the most notable international trade fair for building and construction technology – bautec, the congress “FAÇADE 2018” took place on 22 February in Berlin. Around 500 architects, planners and engineers got the latest information about the current trends and developments in the façade sector. In the recent year the façade is accepted more than just a pure externality of the building. Its functionality has an increasingly important role. Designing smart, green and sustainable facades has become a main objective of the planners and manufacturers. That is why innovative technologies are developed, revolutionary materials and new ways of designing are being tried out.

Daniel Pfanner from Bollinger + Grohmann explained from an engineering point of view the variations in functionality possible with the Fluid Flow facades. After all, individual energy-efficient components do not actually lead to energy savings in the building. Only the coordination of the single devices and techniques in a combination brings significant energy savings. A flow simulation in advance of the planning can be groundbreaking in this respect.

The congress covered a large variety of topics and clearly conveyed the many advantages of the modern façade designs. In the upcoming years still it will be exciting to see, which facades will manage to combine the aesthetics, functionality and energy savings in order to be considered facades of the future.