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Duka house, Gothenburg (Sweden)

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Due to massive problems with the acquisition of measured data, it was not possible to perform the full analysis as in the other demonstration buildings of Building EQ. Concerning the fault detection and diagnosis as well as the optimization, only preliminary observations could be achieved. Therefore, it was not possible to calculate any quantitative savings potential and a related costbenefit. However, the possible energy saving potentials are as follows: - Adjustment of the pressure set points for the supply and exhaust fan respectively to avoid unbalanced air flows (supply/ exhaust) - Adjustment of the pressure set points for the supply and exhaust fan respectively to avoid unbalanced air flows (supply /exhaust), decrease fan energy and increase efficiency of heat recovery - Adjust forward temperature set point curves for the heating system to avoid comfort problems - Adjust set points for the fan-coil units in the two lower floors - Adjust set point for the supply air temperature - Adjust operation schedule of dampers in the ventilation duct to the two upper floors
Duka house, Gothenburg (Sweden)

Building owner
AP Fastigheter is Swedens largest property company with around 3.4 million m² property floor area and locations in Stockholm, Uppsala, Malmö, Lund and Gothenburg. Office and retail buildings dominate the building stock of AP Fastigheter. AP Fastigheter owns, manages and constructs buildings.

Duka Home AB and Aniaragymnasiet (Affärseffekt Evert Jansson AB)

Two bottom floors of retail with home furnishing, mainly china, glasses, cutlery, etc. The two upper floors with a private upper secondary school (Aniaragymnasiet).

HVAC concept
District heating: Hydronic radiator systems, one for floors 1 and 2, one for floors 3 and 4.
District cooling: Floor 1 and 2: fan coil units in the ceiling and chilled supply air. Floor 3 and 4: chilled supply air.
Ventilation: Air handling unit on the attic, floor 5. Balanced ventilation with air-to-air heat exchanger. Constant pressure control of the supply and exhaust air fans. Combined air heating/cooling coil supplied from the district heating and cooling substations.

General data


AP Fastigheter

Year of erection

1810, refurbishment 1995, 2003


Retail, offices

Net floor area

1.770 m²

Consumption of property electricity 

62.000 kWh

35 kWh/(m²a)

Consumption of heating/cooling

230.000 kWh

130 kWh/(m²a)

HVAC equipment

heating, cooling, ventilation, air conditioning,

building automation system

Energy source

district heating/cooling

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

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