Experimental testing of exterior wall mounted mechanical ventilation exhaust air outlet devices

Ülar Palmiste*, Tauno Meier, Jarek Kurnitski, Hendrik Voll

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliConference articleScientificvertaisarvioitu

30 Lataukset (Pure)


The purpose of the study was to experimentally test the performance of four types of wall-mounted mechanical ventilation exhaust air outlet devices. A full-scale mock-up of a segment of an external wall with an exhaust air outlet was constructed. The tested exhaust air devices include a gravity louver, fixed-blade louver, louver plate, and exhaust nozzle. The performance assessment included two types of experiments over the exhaust airflow rate range of 25-94 l/s at isothermal conditions with no influencing wind: (i) the particle tracer method with smoke to visualize the exhaust air jets from the outlets, and (ii) the tracer gas method to measure the dilution of CO2 concentration in the exhaust air jet. Furthermore, the aerodynamic performance was comparatively evaluated in terms of pressure drop and exhaust air face velocity at the outlet. The qualitative comparison of airflow patterns by smoke visualization showed notable differences between the tested device types. Concentration decrease evaluation indicated that the exhaust air pollutants are more efficiently transported away from the building wall by exhaust outlets that discharge at 0-45 degrees downwards from the horizontal plane. Discharge angles 60-90 degrees downwards produced a wall-attached jet and the pollutant tracer concentration remained relatively high in the vicinity of the wall.

JulkaisuE3S Web of Conferences
DOI - pysyväislinkit
TilaJulkaistu - 29 maalisk. 2021
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Cold Climate HVAC Conference - Tallinn, Viro
Kesto: 18 huhtik. 202121 huhtik. 2021


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