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Bosch Energy and Building Solutions Global
Renewable local heating

The 100-percent project

In the Black Forest, Bosch Energy and Building Solutions supplies Sozialwerk Am Bruckwald and the residential district with community heating from renewable energy.

Bosch employee Felix Böttcher and managing director Michael Danner-von Wilpert from Sozialwerk

The idyllic community of Waldkirch is located at the edge of the Black Forest. The road in and out of town leads to the Sozialwerk am Bruckwald. 300 people live at the site, and there are 250 jobs for adults with special needs in a large number of workshops that produce high quality food, do gardening work and devote their energy to crafts and manual work. “The site was built just under 25 years ago. Back then, our wood chip-fired system made us pioneers in the area of renewables,” says Michael Danner-von Wilpert, business manager at the facility. “Even then, it was important to us to ensure that our energy supply was sustainable and our carbon footprint small.”

Managing Director Sozialwerk Breisgau, Michael Danner-von Wilpert, Portrait

People who come here are part of our community, whether they’re a visitor, craftsperson or, as on this project, an energy expert.

Michael Danner-von Wilpert, Managing Director Sozialwerk Breisgau

The Sozialwerk has continued to grow over the years, which ultimately necessitated an expansion. The old system just didn’t have the capacity anymore and a new solution was required to supply newly constructed buildings and the adjacent site with a decentralized heating network. Infrastructure was built that allowed five new buildings to be connected to the existing community heating network. “It was clear that we wanted to continue using wood as a fuel. The existing wood chip-fired system was unable to supply the new buildings with both heat and warm water,” recalls Felix Böttcher from Bosch Energy and Building Solutions. As a planning engineer, he managed the project throughout the consultancy, planning and final implementation stage before handing the project over to the Bosch Operations Team. The on-site work was something special for him. “The Sozialwerk is a wonderful thing. We felt like we really belonged to the community right from the beginning.” As Michael Danner-von Wilpert adds: “People who come here are part of our community, whether they’re a visitor, craftsperson or, as on this project, an energy expert. That means, for instance, that we all sit down to lunch together – everyone talks to everyone. This allows us all to get to know each other. And once the Bosch Team got down to work, our residents found it exciting and interesting.”

Wood chip plant at Sozialwerk Am Bruckwald, interior, view into the combustion chamber with Peter Buehler from Bosch
A 500 kW wood chip-fired boiler system forms the heart of the new solution. For this photo, Peter Buehler from the Bosch Operations Team gives us a look inside the combustion chamber.
Wood chip plant at Sozialwerk Breisgau, interior, screw conveyor transports wood chips
The untreated wood chips used in the wood-fired boiler are sourced regionally.
Wood chip plant at Sozialwerk Breisgau, interior, facility manager and Bosch employees in front of the heat distribution system
The facility managers have on-site operations under control. The Bosch team has remote access to the building control system and have a remote view of energy and resource requirements.
Aerial view of Sozialwerk Am Bruckwald near Freiburg, exterior view
The Sozialwerk "Am Bruckwald" continues to grow. New buildings have been added in the last 25 years, and construction is currently ongoing. The new local heating supply is designed to handle increasing requirements.
Building of the Sozialwerk Am Bruckwald, exterior view
In addition to the energy supply, sustainability is also important in the construction of the buildings.
Employees in the bakery of the Sozialwerk Am Bruckwald at work in the bakehouse
Various organic-certified baked goods are produced in the in-house bakery and distributed regionally. Pasta will also be produced at the Sozialwerk Breisgau.
Sign with bread advertising
Very delicious: We were allowed to taste and can only confirm.
Entrance area brokkolise, logo
The "brokkolise" is an inclusionary concept that combines meaningful engagement with sustainable food purchasing.
Employee fills a box with fruit
From the field to the plate in organic quality and unpackaged: the “brokkolise” offers an organic market and also many boxes to order online.
Team from Bosch and Sozialwerk Breisgau, group picture
Consistent teamwork from the initial idea to implementation and operation: (from left to right) business manager Michael Danner-von Wilpert, facilities managers for the Sozialwerk, Reinhard Donner and Ewald Weindl, Peter Buehler and Felix Böttcher from Bosch

100% team power for the new wood chip heating system

The new solution is based around a 500 kW wood chip-fired boiler system. “Right from the moment we first contacted the engineers at Bosch up to the inventory analysis, everything proceeded quickly, and we soon had the foundations for a grant proposal. In the future, we’ll have the means to supply the social campus, which is currently being developed at the periphery our site, with energy. That’s in keeping with our philosophy of opening up spaces for development within the community,” explains Michael Danner-von Wilpert. These ideas and goals remained front and center during the planning phase. “This is how the site will develop and change. How will people live and work here in the future? Factoring in these considerations allowed us to extrapolate our power requirements and adapt our supply of heat to our future needs,” says Böttcher, describing the planning phase. “The required capacity will continue to grow, but the building where the heating system is located won’t. This meant we had to get creative.” Böttcher and his team planned a new heat distribution system. Three pipelines supply heat to the different building clusters that have gone up over the years. One line, sections of which were newly laid, supplies the new buildings on the other side of the road. Each of these lines is supplied by a new, high-efficiency pump of its own. When modernizing the central power station, the control and regulation systems were updated, and an energy management system from Bosch was installed. Since then, the central heating station and the substations of the individual buildings have also been equipped with heat flowmeters. These are all measures that are critical to increased efficiency and a reliable monitoring system.

  • View of the buffer storage of the Sozialwerk Am Bruckwald, exterior view
  • Aerial view of the area of the Sozialwerk Am Bruckwald

Remote everything at a glance

“Using our energy management system , we receive data from all users, providing us with a comprehensive overview. If anything should go wrong because, for instance, a valve is defective, we’ll see it and pass that information along to the facilities managers,” explains Böttcher. The energy management system allows energy data from several sources to be recorded and analyzed. For the Bruckwald site, for example, the system gives us a picture of the wood-fired boiler and measures the fill level of the bunker and the heat storage units on the heat generation side, as well as key parameters on the consumer side. “Our employees have remote access to the building control system and the energy management system. Even the on-site facilities managers can use their computers for direct access to information about whether everything is running smoothly,” says Böttcher. In the background, the energy management system is supplying even more information to the Operations Team from Bosch. Over the long term, data can be evaluated that could point to potential new approaches to energy efficiency. This will allow the energy and resource requirements to be monitored precisely and managed to ensure optimal use. The Bosch Operation Team monitors the system parameters, optimizes the system during operation, manages maintenance, thereby ensuring that the energy supply is 100% reliable.

In the central heating system, almost nothing has been left untouched

The 10,000 liter hot water containers are a thing of the past, having been replaced by a new storage tank – located outside the facility – that has double the capacity. “This provided more space for a new, larger wood-fired boiler in the central heating system, the new pressure maintenance system and a new gas condensing boiler,” explains Böttcher. An old, now-dismantled gas boiler was used for the interim to ensure a supply of heat until the new wood-fired boiler could be installed. In the future, the new gas condensing boiler will provide a reserve. “We’ve installed an intelligent control system that can monitor the temperature and fill level. If the values are too low, the gas boiler is automatically activated,” explains Böttcher.

Felix Böttcher from Bosch in front of the display control unit at Sozialwerk Am Bruckwald

Biomass facilities to reduce CO₂

The untreated wood chips are transported short distances by truck from regional sources and dumped directly into the underground bunker. “Our team has years of experience in planning and operating biomass facilities. Using wood chips as fuel remained the obvious solution here in the Sozialwerk Breisgau,” Böttcher explains. A push floor is used to transport the wood chips onto a screw conveyor, which carries the material into the central heating system and, from there, into the combustion chamber of the furnace. The ash produced is collected in special containers and later added to lime as fertilizer for the forest. A high-efficiency electric filter is used to reduce the particulate matter which the flue gas contains.

  • The team inspects the material, wood chips
  • View into the silo with wood chips at the Sozialwerk Am Bruckwald


The Sozialwerk am Bruckwald made doing more than the bare minimum its mission right from the beginning. “It’s not about doing what’s necessary, but doing the maximum possible,” says Böttcher. The engineering team gave 100%, and the result is that the regenerative heating is produced using nearly 100% renewable energy sources.

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