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dc.contributor.authorRønneseth, Øystein
dc.contributor.authorLiu, Peng
dc.contributor.authorAlonso, Maria Justo
dc.contributor.authorMathisen, Hans Martin
dc.date.accessioned2019-11-06T06:16:29Z
dc.date.available2019-11-06T06:16:29Z
dc.date.created2019-11-05T09:02:36Z
dc.date.issued2019
dc.identifier.issn1755-1307
dc.identifier.urihttp://hdl.handle.net/11250/2626756
dc.description.abstractHeat recovery in ventilation is essential to reduce energy use and thus mitigate greenhouse gas emissions from the building sector. Heat recovery efficiency of at least 80% in new buildings is required according to Norwegian standards. However, measurements show that the real heat recovery efficiency during operation is commonly 10-20 % lower. Measuring heat recovery efficiency in buildings is challenging, mainly due to difficulties measuring airflow rates close to the air handling unit (AHU). This study assesses the following duct airflow measurement techniques and equipment: pressure differential, velocity traversal technique, ultrasound and tracer gas. The pressure differential method can provide accurate flow rates and thus it is used as the reference measurement. However, it is not suitable for duct flow measurements due to its high pressure penalty and long straight duct requirement. Velocity traverse and tracer gas methods introduce less disturbance to the flow. Nevertheless, both methods require intensive labour work and cannot track quick changes of the airflow with time. The application of ultrasound to measure airflow is relatively novel and it can automatically measure constant and fluctuating airflows with low pressure drop and acceptable accuracy when the proper installation and minimum straight duct are provided.nb_NO
dc.language.isoengnb_NO
dc.publisherIOP Publishing LTDen
dc.relation.ispartof1st Nordic conference on Zero Emission and Plus Energy Buildings
dc.rightsCC BY 3.0*
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/*
dc.titleTechniques for airflow measurements to determine the real efficiency of heat recovery in ventilation systemsen
dc.typeConference objectnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.rights.holder© The authorsnb_NO
dc.subject.nsiVDP::Teknologi: 500en
dc.source.volume352nb_NO
dc.source.journalIOP Conference Series: Earth and Environmental Science (EES)eb
dc.identifier.doi10.1088/1755-1315/352/1/012068
dc.identifier.cristin1744025
cristin.unitcode7401,30,40,0
cristin.unitnameArkitektur, byggematerialer og konstruksjoner
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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