Workshops in Lindenberg
End of the year 2005 a new sheltered workshop was established in Lindenberg (Allgäu, Germany). The building accommodates 140 workplaces (expandable to 200) for diverse trades, 40 office work stations for the local administration and a recreation area. The building has a A/V value of 0,39. The technical building equipment comprises a wood pellet boiler to cover the peak load (capacity 140 kW), two photo-voltaic modules (capacity 24 kW) as well as three groundwater heat pumps for base load operation.
| Country | Germany |
| City | Lindenberg (Allgäu) |
| Client name | Lebenshilfe für Menschen mit Behinderung e.V. Kreisvereinigung Lindau |
| Building type | Office building |
| Year of construction | 2004 |
| Heat source/sink | Water/Water |
| Heat pump type | Electric heat pump |
| Year of installation | 2004 |
| Purpose | Heating only |
| Heat source system | Aquifer/wells |
| Design heating temperature | supply: 0°C return: 0°C |
| Design cooling temperature | supply: 0°C return: 0°C |
| Operation mode | Bivalent |
| Refrigerant | R407C |
| Contact name | Alois Sellner HVAC |
| Contact E-mail | internedienste@lh-lindau.de |
| Contact website | http://www.lh-lindau.de |
| Supported by | Federal Ministry of Economics and Technology (BMWi) |
Project description
Building, overall energy concept
After an ecological-economical comparison the decision was made to build a wooden house. An evaluation of the energy demand for producing the house showed that concerning primary energy and CO2 equivalent this solution was three times more favourable than a solid building.
Photo 1: View of the community centre
Energy concept:
- Ventilation and space heating in wintertime:
The building is equipped with a forced ventilation system. A reason for that are the remarkable dimensions of rooms (up to 18 meters, e.g. workshops). The exhaust air heat exchangers have an efficiency of 70%.
Space heating coming from the heat pumps is distributed via a floor heating system. The northward located workshops got ceiling radiation heaters. Solar heated air from the workshops can be used in the offices located upstairs as preheated fresh air.
- Ventilation and cooling in summertime:
Space cooling in summertime is provided from ground water via a water-to-water heat exchanger to the floor heating system. The cooling capacity of this direct cooling system is limited to approximately 20 W/m².
Dampers and windows can be opend manually, especially exposed areas are equipped with electrically driven dampers. The glass roof got a horizontal shadow equipment.
Photo 2: View of the southern fassade with PV plant
Technical data:
- Useful floor area: 3.198 m²
- Annual heat demand: 19,4 kWh/m²a
- A/V factor: 0,39 1/m
- Average U-value: 0,37 W/(m²K).
Heat pump system
Photo 3: Heat pump room
Three groundwater heat pumps are used for space heating. The groundwater is extracted from the supply well and after usage in the heat pump fed into a creek nearby.
The peak load is covered by a wood pellet boiler with a capacity of 140 kW. It provides high temperature heat for domestic hot water preparation, ceiling radiation heaters and heater coils of the ventilation system.
Operation experiences
Originally only one heat pump had been planned. However, to be able to react on a possible falling of the ground water level finally two heat pumps were installed. Now, the plant is fail-proof and more flexible due to stepwise capacity control.
Incidents, problems:
- collapse of the groundwater well
- ground water level control problematic
Costs, economic efficiency, incentives
Investment cost:
- building construction: 999 Euro/m² net floor area
- technical installations: 452 Euro/m²
Total investment cost: 6.5 Mio Euro
Supported by the Federal Ministry of Economics and Technology (BMWi) within the incentive programme "Solaroptimiertes Bauen" (SolarBau).
Regulations, guidelines, benchmarking
No information available
References
- Workshops for handicapped people
Database EnOB Forschung für Energieoptimiertes Bauen - Objektbericht: Energieeffizienz mittels Solaroptimierung - Die Neuen Werkstätten für behinderte Menschen der Lebenshilfe Lindenberg e.V., K. Schuster et al., greenbuilding 01/08
| Design value | Measured data | |
|---|---|---|
| Year1 | 2002 | 2006 |
| Heating capacity (kW)2 | 54,3 | |
| Cooling capacity (kW)3 | ||
| COP (Heating, appliance)4 | 6,3 - 6,7 | |
| SPF (Heating) | 5,0 | 5,4 |
| Annual heat delivery (kWh/year) | 90.000 | 111.000 |
| PER (Heating /Cooling)5,6 | 1,85 | |
| Annual CO2 emissions (kg CO2/year)7 |
1 Design phase: 2002-2004
2 Supply temperature: 35°C
3 direct cooling
4 Supply temperature: 35°C
5 Primary Energy Ratio: Useful heating (and cooling) energy delivered / primary energy input (kWhUE / kWhPE)
6 PEER=annual heat delivery/primery energy demand=SPF/fPE, fPE=Average European primary energy factor: 2,35 kWhPE/kWhel, Primary energy factor used in this case: 3,0 kWhPE/kWhel
7 Average European CO2 factor for electricity: 0,45 kg CO2/kWhel
| Institution/Company | A3 Architekten |
| Responsibility/Function | Site management |
| Street/PoBox | Rathausstraße 12 |
| ZIP | 88161 |
| City | Lindenberg |
| Country | Germany |
| Contact Person | Mr. Nottberg |
| Institution/Company | Ingenieurbüro Haulsaden GmbH |
| Responsibility/Function | Building services engineering, energy concept, thermal construction physics, simulations |
| Street/PoBox | Hausen 17 |
| ZIP | 88161 |
| City | Kirchheim |
| Country | Germany |
| Contact Person | Mr. Bauer, Mrs. Jacobsen |
| Phone/Fax | +49-89-991525-0 / Fax: +49-89-991525-99 |
| info@ibhausladen.de | |
| Website (URL) | www.ibhausladen.de |
| Institution/Company | Lebenshilfe für Behinderte e.V. |
| Responsibility/Function | building owner |
| Street/PoBox | Lauenbühlstraße 67 |
| ZIP | 88161 |
| City | Lindenberg |
| Country | Germany |
| Contact Person | Mr. Reisinger |
| Phone/Fax | +49-8381-8907-100 / +49-8381-8907-109 |
| info@lh-lindau.de | |
| Website (URL) | http://www.lh-lindau.de |
| Institution/Company | Lichtblau Architekten BDA |
| Responsibility/Function | architects |
| Street/PoBox | Söltlstraße 14 |
| ZIP | 81545 |
| City | München |
| Country | Germany |
| Contact Person | Mr. Florian Lichtblau |
| Phone/Fax | +49-89-642787-40 / +49-89-642787-99 |
| info@lichtblau-architekten.de | |
| Website (URL) | http://www.lichtblau-architekten.de/ |
