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Ministry of Economic Affairs and Energy of the State of North Rhine-Westphalia, Düsseldorf (Germany)

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The Ministry of Economic Affairs and Energy of the State of North Rhine-Westphalia is a large administrational building that was constructed in several parts in the 1950's and 1960's. The analysis done in the framework of the Building EQ project revealed a cost saving potential of about 35,000 EUR which corresponds to 12 % of the yearly energy cost.
Ministry of Economic Affairs and Energy of the State of North Rhine-Westphalia, Düsseldorf (Germany)

Building owner
The "Bau und Liegenschaftsbetrieb" is a public owned company that is responsible for the facility management of all buildings belonging to the state of  North Rhine-Westphalia.

Ministry of Economic Affairs and Energy of the State of North Rhine-Westphalia.

The building´s main use is for administrative purposes with offices, conference rooms and a canteen. Most offices are naturally ventilated while most of the conference rooms and the cantine are air-conditioned. Other special uses include a library, a server room, an archive in the basement and a print shop.

Building concept
The building consists of two parts: A tower block with 18 floors and an adjacent L-shaped building with 7 floors. Both parts have classic facades and a basement. Approximately 70% of the whole building is used as office space(mostly single room offices).  Archives and the technical installations for heating and cooling are situated in the besement.  Most of the air handling units are installed on the uppermost floors of the building.

HVAC concept
The majority of the building is heated by radiators which are supplied by district heating. A central compression chiller supplies most of the air handling units which provides cooling for the special use areas like conference rooms and the canteen. Additional compact water chillers and split systems supply further areas like the server room. The building has more than 10 air handling units for the different special use areas.

General data

Owner Bau- und Liegenschaftsbetrieb NRW
Year of erection 1953-1961
Use Office building
Net floor area 30.000 m²
Consumption of electricity 1.300.000 kWh/a (2006)
  44 kWh/(m²a)
Consumption of heating 2.400.000 kWh/a (2006)
  80 kWh/(m²a)
HVAC equipment heating, cooling, ventilation, air conditioning,
  building automation system
Energy source district heating

Acronym of the case


Lessons learnt

The main saving potential is the reduction of the capacity of the district heating supply. Although this reduction does not affect the energy consumption, the corresponding cost savings of about 30,000 EUR shows the importance of a monitoring system. Further energy saving potentials could be identified. Among these are typical ones like simultaneous heating and cooling in air handling units, inefficient (and unintended) part load operation of the major chiller and leaking valves in the heating circuits. Results of the Building EQ project - Energy saving potential in the operation of buildings 5 - 30 % - Realisation of these potentials with low or no investment costs - BuildingEQ methods and tools allow quick and cost efficient detection of these potentials - Ongoing performance evaluation is prerequisite for energy efficient operation - Consortium suggests amendment of EPBD with mandatory performance monitoring

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