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Influence of different ventilation levels on indoor air quality and energy savings: a case study of a single-family house
KTH.
Högskolan Dalarna, Akademin Industri och samhälle, Byggteknik.ORCID-id: 0000-0002-9943-9878
KTH.
2015 (Engelska)Ingår i: Sustainable cities and society, ISSN 2210-6707, Vol. 19, s. 165-172Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The influence of different ventilation levels on indoor air quality (IAQ) and energy savings were studied experimentally and analytically in a single-family house occupied by two adults and one infant, situated in Borlänge, Sweden. The building studied had an exhaust ventilation system with a range of air flow rate settings. In order to find appropriate ventilation rates regarding CO2, relative humidity (RH) and temperature as indicators of IAQ, four ventilation levels were considered, as follows: (I) A very low ventilation rate of 0.10 L s-1 m-2; (II) A low ventilation rate of 0.20 L s-1 m-2; (III) A normal ventilation rate of 0.35 L s-1 m-2; (IV) A high ventilation rate of 0.70 L s-1 m-2. In all cases, the sensor was positioned in the exhaust duct exiting from habitable spaces. Measurements showed that, for case I, the CO2 concentration reached over 1300 ppm, which was higher than the commonly referenced threshold for ventilation control, i.e. 1000 ppm, showing unacceptable IAQ. In case II, the CO2 level was always below 950 ppm, indicating that 0.20 L s-1 m-2 is a sufficient ventilation rate for the reference building. The case III showed that the ventilation rate of 0.35 L s-1 m-2 caused a maximum CO2 level of 725 ppm; showing the level recommended by Swedish regulations was high with respect to CO2 level. In addition, measurements showed that the RH and temperature were within acceptable ranges in all cases. An energy savings calculation showed that, in case II, the comparative savings of the combined energy requirement for ventilation fan and ventilation heating were 43% compared with case III.

Ort, förlag, år, upplaga, sidor
2015. Vol. 19, s. 165-172
Nyckelord [en]
Energy savings, Indoor air quality, Site measurements, Ventilation level
Nationell ämneskategori
Samhällsbyggnadsteknik
Forskningsämne
Energi, skog och byggd miljö
Identifikatorer
URN: urn:nbn:se:du-19805DOI: 10.1016/j.scs.2015.08.004ISI: 000367398900017Scopus ID: 2-s2.0-84944054031OAI: oai:DiVA.org:du-19805DiVA, id: diva2:862661
Tillgänglig från: 2015-10-23 Skapad: 2015-10-23 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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