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Numerical Modeling of a Complex Diffuser in a Room with Displacement Ventilation
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energiteknik.ORCID-id: 0000-0003-2023-689X
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Energiteknik.ORCID-id: 0000-0003-3472-4210
2010 (engelsk)Inngår i: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 45, nr 10, s. 2240-2252Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A micro/macro-level approach (MMLA) has been proposed which makes it possible for HVAC engineers to easily study the effect of diffuser characteristics and diffuser placement on thermal comfort and indoor air quality. In this article the MMLA has been used to predict the flow and thermal behavior of the air in the near-zone of a complex low-velocity diffuser. A series of experiment has been carried out to validate the numerical predictions in order to ensure that simulations can be used with confidence to predict indoor airflow. The predictions have been performed by means of steady Reynolds Stress Model (RSM) and the results have good agreement both qualitatively and quantitatively with measurements. However, measurements indicated that the diffusion of the velocity and temperature was to some extent under-predicted by the RSM, which might be related to high instability of the airflow close to the diffuser. This effect might be captured by employing unsteady RSM. The present study also shows the importance of detailed inlet supply modeling in the accuracy of indoor air prediction.

sted, utgiver, år, opplag, sider
2010. Vol. 45, nr 10, s. 2240-2252
Emneord [en]
Displacement ventilation, Inlet supply, Numerical simulation, Reynolds stress model
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-10303DOI: 10.1016/j.buildenv.2010.04.008ISI: 000279464900019Scopus ID: 2-s2.0-77953541457OAI: oai:DiVA.org:hig-10303DiVA, id: diva2:442671
Tilgjengelig fra: 2011-09-22 Laget: 2011-09-22 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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