• Acceptable air velocities using demand-controlled ventilation for individual cooling 

      Thunshelle, Kari; Nordby, Henrik S.; Solberg, Håkon Rikoll; Holøs, Sverre Bjørn; Schild, Peter (E3S Web of Conferences;Volume 172, 2020. 12th Nordic Symposium on Building Physics (NSB 2020). Article Number: 09002, Journal article; Peer reviewed, 2020-06-30)
      One of the main challenges in highly insulated buildings is the increasing share of energy demand for cooling. New solutions for low energy cooling are needed. Individual cooling by demand-controlled ventilation and use ...
    • Demand-controlled ventilation in schools: Influence of base ventilation rates on subjective symptoms, perceived indoor environment and young adults' learning performance 

      Holøs, Sverre Bjørn; Yang, Aileen; Thunshelle, Kari; Mysen, Mads (SINTEF Proceedings;9, Chapter; Peer reviewed; Conference object; Journal article, 2021)
      The ventilation airflow rates in a demand-controlled ventilation strategy typically vary between a base (Vmin) and a maximum ventilation rate (Vmax). Classrooms have relatively short but intense hours of occupancy and a ...
    • Demand-controlled ventilation: do different user groupsrequire different CO2-setpoints? 

      Haugland, Martine Borgen; Yang, Aileen; Holøs, Sverre Bjørn; Thunshelle, Kari; Mysen, Mads (IOP Conference Series: Materials Science and Engineering;Volume 609, Journal article; Peer reviewed, 2019)
      The aim of this study is to investigate whether children's bioeffluent generation rate is proportional to their carbon dioxide (CO2) generation rate. Consequently, to assess if there is a need to differentiate the CO2- ...
    • Effect of filter type in ventilation systems on NO2 concentrations in classrooms 

      Yang, Aileen; Nikolaisen, Kristian Fredrik; Holøs, Sverre Bjørn; Thunshelle, Kari; Dauge, Franck Rene; Mysen, Mads (Springer Proceedings in Energy;Cold Climate HVAC 2018 - Sustainable Buildings in Cold Climates, Chapter; Conference object; Peer reviewed, 2018-12-12)
      This study was conducted to assess how different filter types in the ventilation system affect the indoor NO2 concentrations. Measurements were carried out in two classrooms and air intakes in a primary school located in ...
    • Effect of ventilation on perceived air quality in 18 classrooms 

      Holøs, Sverre Bjørn; Yang, Aileen; Thunshelle, Kari; Mysen, Mads (IOP Conference Series: Materials Science and Engineering;Volume 609, Journal article; Peer reviewed, 2019)
      The aim of this paper is to assess whether reducing the minimum ventilation airflow rate (Vmin) has any negative impacts on perceived air quality (PAQ) upon entering an unoccupied room. Seventeen healthy young adults were ...
    • How Does Low Relative Humidity Affect Perceived Air Quality, Thermal Comfort and Symptoms in Modern Office Buildings in Cold Climates? 

      Lind, Merethe; Holøs, Sverre Bjørn; Thunshelle, Kari; Yang, Aileen; Mysen, Mads (Springer Proceedings in Energy;Cold Climate HVAC 2018 - Sustainable Buildings in Cold Climates, Chapter; Conference object; Peer reviewed, 2018-12-12)
      To assess how people are influenced by relative humidity (RH) in cold climates, a study was conducted in an open office landscape in Oslo, Norway. The study took place during three cold days in February 2017. Fourteen ...
    • Impact of Typical Faults Occurring in Demand-controlled Ventilation on Energy and Indoor Environment in a Nordic Climate 

      Andersen, Kamilla Heimar; Holøs, Sverre Bjørn; Yang, Aileen; Thunshelle, Kari; Fjellheim, Øystein; Jensen, Rasmus (E3S Web of Conferences;Volume 172, 09006 (2020, Journal article; Peer reviewed, 2020-06-30)
      This study evaluates typical faults occurring in demand-controlled ventilation (DCV) system and the impact on three output results: energy use, thermal comfort, and indoor air quality. The methodologies used in this study ...
    • Should we differentiate ventilation requirements for different user groups? 

      Holand, Nora; Yang, Aileen; Holøs, Sverre Bjørn; Thunshelle, Kari; Mysen, Mads (Springer Proceedings in Energy;Cold Climate HVAC 2018 - Sustainable Buildings in Cold Climates, Chapter; Conference object; Peer reviewed, 2018-12-12)
      The aim of our study is to investigate whether it is necessary to adjust the venti-lation requirements according to different user groups. This study is focusing es-pecially on teenagers, who might have a higher odour load ...
    • Temperature-dependent ventilation rates might improve perceived air quality in a demand-controlled ventilation strategy 

      Yang, Aileen; Holøs, Sverre Bjørn; Opsahl Resvoll, Marie; Mysen, Mads; Fjellheim, Øystein (Building and Environment;Volume 205, November 2021, 108180, Peer reviewed; Journal article, 2021-07-24)
      The aim of the Best Vent project was to find the optimal control strategy for demand-controlled ventilation (DCV) without compromising on indoor air quality. In this paper, we discuss control strategies that would ensure ...
    • VOC contributions from building materials, furniture, and user equipment in low emitting and modular classrooms 

      Yang, Aileen; Holøs, Sverre Bjørn; Hak, Claudia; Vogt, Matthias; Schmidbauer, Norbert; Fjellheim, Øystein (SINTEF Proceedings;9, Chapter; Peer reviewed; Conference object; Journal article, 2021)
      This study aimed to assess whether building materials, furniture, and user equipment are sources of pollution that would influence the need for ventilation. Between 2017-2020, measurements were taken in four regular ...
    • VOC emission rates in newly built and renovated buildings, and the influence of ventilation – a review and meta-analysis 

      Holøs, Sverre Bjørn; Yang, Aileen; Lind, Merethe; Thunshelle, Kari; Schild, Peter; Mysen, Mads (The International Journal of Ventilation;, Journal article; Peer reviewed, 2018-02-20)
      Few field studies have evaluated ventilation strategies, such as temporarily increasing the ventilation rate, to counter the high pollutant-load from off-gassing of volatile compounds from new materials in these buildings. ...
    • What should the Minimum Ventilation Rate Be in a Demand-Controlled Ventilation Strategy? 

      Mysen, Mads; Holøs, Sverre Bjørn; Yang, Aileen; Thunshelle, Kari; Schild, Peter (Springer Proceedings in Energy;CCC 2018: Cold Climate HVAC 2018, Chapter; Conference object; Peer reviewed, 2019)
      Demand-Controlled Ventilation is emerging as a dominant ventilation strategy in non-residential buildings in Norway. The ventilation airflow rate is controlled between pre-set minimum (Vmin) and maximum (Vmax) values, based ...