Low-energy mechanical ventilation: a case study of two new office buildings

Claus Wessel Andersen, Christian Anker Hviid

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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In 2010 an internationally renowned company initiated an architectural competition for two new office buildings to be constructed in Denmark. The design objectives were to construct a sustainable office building according to Danish low energy class 2015, with a good indoor climate and with as
little energy consumption as 41.1 kWh/m2/year including heating and all building services with no use of renewable energy such as PVcells or solar heating. One of the key means of reaching the objectives was to implement mechanical ventilation with low pressure loss and therefore low energy consumption. The project consists of two buildings, building one is 6 stories high, and building two is
4 stories high. The buildings have a gross area of 50,500 m2 including underground parking. The ventilation and indoor climate concept was to use mechanical ventilation together with mechanical cooling and fanassisted
natural ventilation for free night cooling, hence minimizing the energy consumption for cooling. The paper describes the initial ventilation requirements and the implemented ventilation system. The specific fan power, SFP, with maximum air flow rate was measured to be 0.9 kJ/m3 to 1.2 kJ/m3, with an average of 1.1 kJ/m3. The yearly mean SFP based on estimated runtime is
approx. 0.8 kJ/m3. The case shows the unlocked potential that lies within mechanical ventilation for nearzero energy consuming buildings.
Original languageEnglish
Title of host publicationProceedings of the 10th Nordic Symposium on Building Physics
EditorsJesper Arfvidsson, Lars-Erik Harderup, Anders Kumlin, Bitte Rosencrantz
Number of pages8
PublisherLund University
Publication date2014
Article number89
ISBN (Electronic)978-91-88722-53-9
Publication statusPublished - 2014
Event10th Nordic Symposium on Building Physics - Lund, Sweden
Duration: 15 Jun 201419 Jun 2014
Conference number: 10


Conference10th Nordic Symposium on Building Physics
Internet address


  • Mechanical ventilation
  • Low-energy
  • Ventilation
  • Indoor climate
  • Specific fan power

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