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The comparison of design airflow rates with dynamic and steady-state displacement models in varied dynamic conditions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Lastovets, Natalia
dc.contributor.author Kosonen, Risto
dc.contributor.author Jokisalo, Juha
dc.date.accessioned 2020-11-30T08:11:12Z
dc.date.available 2020-11-30T08:11:12Z
dc.date.issued 2020-11-07
dc.identifier.citation Lastovets , N , Kosonen , R & Jokisalo , J 2020 , ' The comparison of design airflow rates with dynamic and steady-state displacement models in varied dynamic conditions ' , BUILDING SIMULATION . https://doi.org/10.1007/s12273-020-0730-2 en
dc.identifier.issn 1996-3599
dc.identifier.issn 1996-8744
dc.identifier.other PURE UUID: 17f7f8c4-e9bd-45f9-9d9a-18ecbc2961d8
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/17f7f8c4-e9bd-45f9-9d9a-18ecbc2961d8
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85095573210&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/53173718/ENG_Lastovets_et_al_The_Comparison_Of_Design_Airflow_Building_Simulation.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/61643
dc.description.abstract A temperature-based method is usually applied in displacement ventilation (DV) design when overheating is the primary indoor climate concern. Different steady-state models have been developed and implemented to calculate airflow rate in rooms with DV. However, in practical applications, the performance of DV depends on potentially dynamic parameters, such as strength, type and location of heat gains and changing heat gain schedule. In addition, thermal mass affects dynamically changing room air temperature. The selected steady-state and dynamic models were validated with the experimental results of a lecture room and an orchestra rehearsal room. Among the presented models, dynamic DV model demonstrated a capability to take into account the combination of dynamic parameters in typical applications of DV. The design airflow rate is calculated for the case studies of dynamic DV design in the modelled lecture room in both dynamic and steady-state conditions. In dynamic conditions of heavy construction in 2–4 hours occupancy periods, the actual airflow rate required could be 50% lower than the airflow rate calculated with the steady-state models. The difference between steady-state and dynamic multi-nodal model is most significant with heavyweight construction and short occupancy period (17%–28%). In cases with light construction, the dynamic DV model provides roughly the same airflow rates for four-hour occupancy period than the Mund’s model calculates. The dynamic model can significantly decrease the design airflow rate of DV, which can result in a reduction of investment costs and electrical consumption of fans. en
dc.format.extent 19
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Tsing Hua University
dc.relation.ispartofseries BUILDING SIMULATION en
dc.rights openAccess en
dc.title The comparison of design airflow rates with dynamic and steady-state displacement models in varied dynamic conditions en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Mechanical Engineering
dc.contributor.department Energy efficiency and systems
dc.subject.keyword airflow rate
dc.subject.keyword displacement ventilation design
dc.subject.keyword dynamic model
dc.subject.keyword simplified building energy models
dc.subject.keyword temperature gradient
dc.identifier.urn URN:NBN:fi:aalto-2020113020488
dc.identifier.doi 10.1007/s12273-020-0730-2
dc.type.version publishedVersion

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