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BuildingEQ Demonstration Building Kreuzgebäude Essen (Germany)

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Kreuzgebaeude - Essen

Kreuzgebaeude - Essen

The Kreuzgebäude is a typical office building from the 1980ies. The analysis done in the framework of the Building EQ project revealed a saving potential of about 20 % of the heating energy. The main saving potential was the correction of the night setback of the heating. Before the correction the pumps were operated day and night 7 days a week. The analysis showed that this was unnecessary as the building is not used during the night and on weekends. Consequently a new opera tion schedule was introduced that turns off the pumps during unoccupied periods. Even though, this measure is comparably simple it became obvious that a continuous monitoring is necessary to guarantee an energy efficient building operation.
Kreuzgebäude, Essen (Germany)

Building owner
The ThyssenKrupp Real Estate concern manages buildings having different uses within the scope of the Corporate Real Estate Management concept, designated as the success-oriented management and marketing of office real estate.

The owner of the building rents the areas to other subcompanies of ThyssenKrupp. At the moment, all users are of the ThyssenKrupp AG, although  other tenants would also be possible.

The "Kreuzgebäude" is a typical office building of the 1980´s. About 90% of the rooms are used as office rooms, mostly single offices, including the computer design rooms. The standard size for a single office is approx. 20 m². Further special uses for the building are a cafeteria, small kitchen, small kiosk, server room and copy area. Altogether approx. 400 employees work in the building.

Building concept
The  building floor plan has the form of a cross, therefore the name "Kreuzgebäude" was derived. A central staircase connects 4 wings with a long corridor and office rooms on both sides of the corridor. The straight facade of the wings are partly broken by honeycomb-shaped structures. In these structures open-plan offices are situated which were converted to single rooms during a renovation that is going on since 2002. Small kitchens and WCs are placed near the staircase. The building construction has a double leaf facade with clinkers and a flat roof. Since the building´s construction in 1985, no renovation was carried out on the exterior components.

HVAC concept
The heating of the building occurs through district heating delivered by the company Steag, which runs a gas-cogeneration-unit. All rooms are provided with heating elements, which can be adjusted manually by the users. Originally the small offices were not equipped with a cooling or ventilation system. However, little by little the building owner installed multi-split devices in order to provide cool air to the rooms. At the moment about 50% of the offices are equipped with these devices. Ventilation is performed manually through the windows like before and causes no disconnection of the air conditioners. The office spaces in the honeycomb structures are supplied via a supply/exhaust air system located on the roof. These 6 ventilators are equipped with reheating registers and heat recovery. The owner will gradually shut down this system and replace it with multi-split devices as in the other rooms. Additionally, several exhaust air systems are available, e.g. for the cafeteria, WC, copying area, garbage/waste area. None of these are equipped with any heat recovery system. Hot water is supplied via a heat exchanger from the district heating system and is stored in a warm water storage. All lights are fluorescent from 1985 and have been not replaced since then.

General data

Owner ThyssenKrupp Real Estate GmbH
Year of erection 1985
Use Office building
Net floor area 19.500 m²
Consumption of electricity 1.000.000 kWh/a (2006)
  51 kWh/(m²a)
Consumption of heating 1.500.000 kWh/a (2006)
  77 kWh/(m²a)
HVAC equipment heating, ventilation, air conditioning,
  building automation system
Energy source district heating

Acronym of the case


Lessons learnt

Results of the Building eQ project - Energy saving potential in the operation of buildings 5 - 30 % - Realisiation 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

Award labels

Additional documents

Available link languages

Start date - End date

Monday, 1 January, 2007 to Thursday, 31 December, 2009

Source of funding