Practices

Nordea Bank Building Helsinki, Finland

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The building has an air-conditioning system with mechanical supply and exhaust ventilation and chilled beams. Outdoor air is filtered and heated or cooled in central air handling units and supplied to rooms. Supply air is heated in the central air handling units partly with heat recovered from extract air and partly with heating coils. When cooling is needed, supply air is first cooled in the central air handling units and then cooled further in the chilled beam units in rooms. Both systems use chilled water cooled by compressor chillers. Rooms are heated with hot water radiators, controlled by thermostatic valves. All the heating systems in the building are connected to a district heating network through heat exchangers.

Key points concerning the design

  • Each room has room controller which enables the highest thermal comfort standard.
  • Chilled beams, low velocity induction devices, provide silent air distribution with low air velocities.
  • The ventilation system is easy to control as it is basically CAV system where cooling and heating is separated from ventilation.
  • Compared to VAV systems, low air velocities and silent operation are major advantages.
  • An effective heat recovery of about 80% and low specific fan power ensure an excellent energy performance.

Acronym of the case

AdVent Case 7

Author(s) information

Name

J Kurnitski

Address

Helsinki University of Technology.

Email

Name

J Palonen

Address

Helsinki University of Technology.

Email

Lessons learnt

In a cold climate, heating of the ventilation air is the most significant component of heating load especially in the non-residential buildings. Hence, to achieve adequate energy performance of the building, the use of controlled ventilation rates and heat recovery is essential. For that reason the use of natural ventilation systems are inappropriate. In addition to the use of heat recovery, an additional benefit is provided by the low specific fan power resulting from the relatively low ventilation rates, reducing electricity consumption. Ventilation rates are based only on occupancy requirement and are significantly lower compared to all-air systems where the volume flow of air is based on cooling or heating need. Low specific fan power is further achieved by the low pressure design of ductwork and demand-controlled air supply to meeting rooms.

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Source of funding

EC

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