TY - JOUR
T1 - Experimental testing of exterior wall mounted mechanical ventilation exhaust air outlet devices
AU - Palmiste, Ülar
AU - Meier, Tauno
AU - Kurnitski, Jarek
AU - Voll, Hendrik
N1 - Funding Information:
This research was supported by the Estonian Research Council, with Personal research funding grant PUT-652 and by the Estonian Centre of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts, ZEBE (grant No. 2014-2020.4.01.15-0016) funded by the European Regional Development Fund.
Publisher Copyright:
© The Authors, published by EDP Sciences, 2021.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/3/29
Y1 - 2021/3/29
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85103543362&partnerID=8YFLogxK
U2 - 10.1051/e3sconf/202124602001
DO - 10.1051/e3sconf/202124602001
M3 - Conference article
AN - SCOPUS:85103543362
SN - 2267-1242
VL - 246
JO - E3S Web of Conferences
JF - E3S Web of Conferences
M1 - 02001
T2 - International Cold Climate HVAC Conference
Y2 - 18 April 2021 through 21 April 2021
ER -