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.

InDeWaG Events

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. Eng. 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 facades – 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 )

Venue: Plovdiv & Sofia, Bulgaria

“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.

SEPTEMBER 24-28, 2018


Venue: Brussels, Belgium

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.

SEPTEMBER 19-21, 2018

IEA SHC Task 56 - 6th Experts Meeting

Venue: Concordia University, Montreal, Canada

“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. Eng. Christoph Maurer (Fraunhofer ISE) participated with a presentation.

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


Venue: TU Dresden, Germany.

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. Eng. 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.

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

MAY 14 - 15, 2018

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. Eng. 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

22 February, 2018 Architects and Planner Congress: FASSADE 2018 — smart green dynamic , at the Fair BAUTEC in 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.

DECEMBER 6, 2017

V International Women4Energy Conference took place on 6th December in Stuttgart, Germany. The topic of this year’s conference was “Next Renewable Energy Solutions” and a special focus on the newest solutions and technologies in the field of Renewable Energies.

Teodora Vatahska, HTCO GmbH gave a Lecture in the event, titled “The dream of light and energy efficiency through water flow glass facades”, presenting InDeWaG.

DECEMBER 6, 2017

Workshop-Series Success Factor Energy Efficiency, Part 8 at Chamber of Industry and Commerce South Oberrhein, Germany, Lecture: Energy concepts, ventilation and air conditioning in modern buildings (Dr. Axel Müller, HTCO GmbH)

NOVEMBER 7, 2017

The ne-xt facades conference place at TUM Department of Architecture, Munich, Germany. It gathered outstanding experts from all over Europe..In the forum where science meets practice have been discussed new developments and technologies for the design and manufacturing of high-performance adaptive building envelopes. Researchers and leading professionals in the facade industry are involved in developing concepts and technologies to increase interior comfort and reduce the energy consumption of buildings. The integrated effort provide successful and holistic concepts in the development, design and construction of a new type of architecture.

The Programme consisted of 4 Sessions. In Session 4 – The Architectural Challenge, Prof. Dr.- Eng. Daniel Pfanner from Bollinger + Grohmann presented InDeWaG in his lecture titled “The Dream of Daylight – Water Flow Glazing”. He shared knowledge about InDeWaG innovation in the context of “a passive radiant surface technology, adoptable to the building envelope”. The contribution gave an overview of the current state of the project and the future potential of the innovative façade technology.

Ne_xt facades, COST Action TU1403 Adaptive Facade Network - Panel discussion

NOVEMBER 6 - 7, 2017

SHARE INTERNATIONAL ARCHITECTURE AND ENGINEERING FORUM acts as an effective platform for networking, business, inspiration and exchange of ideas and transfer of know-how.

During the SHARE FORUM Bucharest 2017 that took place on 6-7 November, more than 500 participants from 13 countries: Romania, the Netherlands, Great Britain, Portugal, Bulgaria, Macedonia, Belgium, Italy, Slovenia, Spain, Norway, France and Poland, attended as both presenters, speakers and guests. The event included some of the most important expo-conferences and debates on architecture and build space, as well as internationally recognized projects were presented.

Hristo Nichev, on behalf of ETEM, presented the InDeWaG project under a presentation, titled “Advanced Building Envelopes”.

Despite the short preview, the project was of great interest for the attendees, as its innovative idea and near-finalized realization is a working proof of the concept, the whole consortium is working on.

OCTOBER 21, 2017

The International ETEM Conference for façade engineering is a global forum for the latest façade technologies designed for creative architecture. It takes place every two years with the objective of presenting the leading architects of the region with the latest ideas a nd concepts in global architecture, as well as state-of-the-art developments in construction technologies.

As a host and a keynote speaker, the R&D Director of ETEM – Veneta Novakova presented the philosophies and approaches, key to creating an innovative and sustainable product. And what better example, than the InDeWaG Façade and Partition Walls Modules.

Her presentation “CONTEMPORARY BUILDING ENVELOPES – IMPACT ON INHABITANTS COMFORT AND WELLBEING” was the perfect opening for this inspiring event, as the 700+ participants, witnessed innovation in the making.

OCTOBER 12, 2017

Prof. Dr. Eng. Daniel Pfanner (Bollinger+Grohmann) held a presentation on a business Conference in Vilnius, Lithuania - “Open House Conference Staticus”.

The topic was on a theme about building envelope. In his talk Daniel Pfanner also introduced to the target audience the InDeWaG innovation concept for industrial development of water flow glazing. Daniel Pfanner presented the project objectives, as well as previous patents, examplaes of “water flow design” (Computational Fluid Dynamic Simulations), “thermal design”, validation and technical design of the facade system. He received important feedback by professionals – comments, appreciations and important questions to be considered further during the project development in near future.

JULY 28, 2017

Prof. Dr. Arch. Benito Lauret and Dr. Arch. Graciela Ovando from UPM – ETSAM gave a presentation with regard to InDeWaG project in the Conference “The Light Façade and Its Sustainability”, which took place in Santa Fe, Argentina . They shared knowledge about the project and its mission to industrial development of “water flow glazing” as a way to improve buildings sustainability, by means of enhanced energy efficiency of glazed facades. The example of the InDeWaG technology strongly drew the attention of attendant professionals, who are concerned with sustainability issues.

JUNE 12 - 16, 2017

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS is a forum for discussion of the latest findings and technologies in different fields of Civil Engineering, Architecture and Urban Planning. It is a platform for future collaborations, sharing knowledge and experiences. WMCAUS 2017 which took place in Prague, Czech Republic during 12- 16 June 2017 is the 2nd of the Annual series. The main mission of the Symposium is to contribute in multidisciplinary studies and to improve interactions between people within these fields.

Abstract collection book is published consisting of the abstracts of papers presented in the forum.

In a Session Titled: BUILDING PERFORMANCE AND SIMULATION, Fernando del Ama Gonzalo, Juan A. Hernandez Ramos, Belen Moreno (UPM-ETSIAE) presented a paper “THERMAL SIMULATION OF A ZERO ENERGY GLAZED PAVILION IN SOFIA, BULGARIA. NEW STRATEGIES FOR ENERGY MANAGEMENT BY MEANS OF WATER FLOW GLAZING”. The researchers held a joint presentation that marked important topics under InDeWaG project, such as: Water Flow Glazing Technology, Description of the Spanish Prototype - Monitoring and Actuating System, Energy Management System, Simulations.

MARCH 23-24, 2017

2nd Annual Innovative Glazing Global Summit, 23-24 March 2017 in Prague, Czech Republic

The 2nd Annual Innovative Glazing Global Summit took place on 23-24 March 2017 in Prague, Czech Republic. Key issues and trending topics within flat glass market were the main theme of the event. Keynotes by professional speakers and networking gave a chance for industry leaders to discuss potential ideas regarding new innovative ways to use glass as a material for many different purposes.

Dipl. Eng. Veneta Novakova from ETEM attended the summit. She gave an inside about InDeWaG project in her presentation titled “Developing a commercial façade system using water flow glazing, which is able to actively control the thermal stability in the interior spaces, and in the same time absorb solar energy, in order to get use of it.”


Dipl. Eng. Veneta Novakova (ETEM) presented InDeWaG concept in Singapore. She had the opportunity to raise awareness about the EU INNOVATION ACTION project InDeWaG in a several meetings held in a prominent companies in the building sector such as: DP Architects, Gensler and Inhabit.

JANUARY 16-21, 2017

InDeWaG at ETEM exhibition booth took place at Hall C1, booth 411 with the exposition of a real-size InDeWaG prototype. At EU projects shared exhibition booth of UBT (B0, booth 212), a functional 1:10 model of the Bulgarian demonstrator was exposed. Promotional InDeWaG materials - small note books 15x15 cm, pens with the InDeWaG logo and brochures, were distributed at both booths for visitors.

DECEMBER 6-8, 2016

UPM–ETSIAE participated with a presentation for the wireless control device for the modular unit (InDeWaG) on the 5th International Conference on Electronic Devices, Systems and Applications (ICEDSA).

NOVEMBER 7 - 8, 2016

Dipl. Eng. Veneta Novakova (ETEM) presented the EU funded project InDeWag in a Training and consultation event in Sofia on 7th – 8th November 2016.

The presentation included detailed information for the research and industrial development of water flow glazing facades. The event was organized as part of the European project Step-2-Sport – renovation of private and public buildings aiming to achieve nearly zero energy consumption.

The target audience were professionals having interest in energy efficiency as well as general users not professionally involved in this topic.

NOVEMBER 7 - 8, 2016

Bulgarian-Indian Scientific Workshop: "Solar energy: strategies, research and applications", 7th – 8th November, 2016

Assoc. Prof. Dr. Maya Stoyanova (CL SENES-BAS) presented the concept of the EU funded project InDeWaG in a Bulgarian-Indian scientific workshop, which took place in Sofia on 7th – 8th November, 2016. The presentation gave an overview on the project objective for Industrial development of innovative façade technology for nearly zero energy buildings. The event was organized by CL SENES with the support of the Ministry of Education and Science of the Republic of Bulgaria. The workshop to "Solar energy: strategies, research and applications" and the target audience were scientists, involved in the topic of RES and energy efficiency, also stakeholders and broaden audience.

OCTOBER 10 - 11, 2016

InDeWaG @ the Advanced Building Skins Conference in Bern, Switzerland, 10-11 October 2016

The project partners elaborated a common paper to be published in the conference proceedings. Architectonika team prepared a poster and Dimitar Paskalev (Architectonika) and Veneta Novakova (ETEM) held a joint presentation under topic D6 "Glass in Advance Building Envelopes" on the 11th of October (second day).

Official website of the event:

OCTOBER 6, 2016

Universidad Politécnica de Madrid (UPM) Escuela Técnica Superior de Arquitectura de Madrid (ETSAM)

Conference in Buenos Aires

Title of paper: Water flow glazing active glass façades: their contribution to zero energy buildings (fachadas de vidrio activo con cámara de agua en circulación: su aportación a los edificios de consumo casi nulo).

Authors: Dr. Lauret Aguirregabiria, Benito; Dra. Ovando Vacarezza, Graciela; Dra. Pérez-Pujazón Millán, Belén Graciela Ovando, on behalf of UPM-ETSAM team presented a paper in Buenos Aires, (6th october) in the conference "XXX Research Conference and XII Regional Meeting SI+ Configurations, Actions and Accounts", held in architecture, design and urban planning faculty of Buenos Aires, Argentina. This paper makes reference to InDeWag project and its objective of developing an active water flow glazing façades for energy efficient buildings.