Providing post-war European buildings with energy efficient solutions is a tricky task, mainly due to the limited options available for installing new piping and wiring. The iNSPiRe credo also prohibits developments that force dwellers out of their home for any period of time. Due to these specifics, the project team has to work on solutions that involve minimum invasive methods and maximum prefabricated installation technologies, which finally have to be felt as ‘comfortable’ by inhabitants. Working under these constraints, Bartenbach GmbH have been pushed to the limits of their imagination in
their efforts to bring lighting standards of these buildings into the 21st century.

The flats being renovated have a characteristic size all over Europe, with a living room size of around 20m2. To refurbish these flats with green energy solutions, Bartenbach GmbH, specialist in daylighting systems as well as artificial lighting, have embarked upon creating lighting solutions connected to heating and cooling suspended ceilings, together with the complete iNSPiRe team.

Usually, radiant ceiling heating systems are more expensive to run than conventional radiators or even to radiant floor heaters. However, in refurbishment applications, the use of radiant ceilings is often the only available solution that allows for the use of heating and cooling components like very low enthalpy water heat pumps (around 30°C in heating and 18°C in cooling mode), without the inhabitants or users of the building having to leave during renovation works.

These panels will use customised lighting fixtures to illuminate the room using existing power outlets on the ceiling. In offices, suspended ceilings will integrate heating, cooling, artificial lighting and daylight redirection.

The design that Bartenbach GmbH have created is a suspended luminaire that offers a glare free experience with direct and even illumination of the dining table and well-balanced indirect ambient illumination. It further reduces the multi-shadow effect and allows specific zoning of the room independent of the position of the suspended panel.

The main part of the luminaire is a complex surface lens,designed and engineered by Bartenbach GmbH and produced by LUXeXceL. It provides direct luminous flux that allows it to precisely illuminate a rectangular table. LUXeXceL were selected for the task due to their expertise in producing individual optics and as being the only company in the world capable of creating 3D printed optics.

To date LUXeXceL have provided the first set of mockups of the central lens, which are currently being researched at the Bartenbach GmbH laboratories. The printing technology delivered will be further tested and implemented in the Bartenbach Development and Research Centre.

More information can be found on “report D4.1”.

Additionally to the artificial lighting product described, a number of natural lighting solutions have been also studied by Bartenbach, Università di Venezia and Fraunhofer ISE. “report D3.1