Acceptability of wall exhaust discharges in residential ventilation

Keijo Kovanen, Jorma Heikkinen, Veijo Siitonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The usual way of extracting the waste air from a building is to convey the air above the roof. However, it would be easier to install exhaust and intake vents on the outer wall of the building. This paper presents the results of full-scale experiments thal were carried out on a three-storey building using tracer gas and video recording. To assess the measured concentration on the building wall, the odour threshold values of exhaust air during cooking or smoking were used. The results were in agreement with the theory underlying the use of roof exhausts near the exhaust opening but at longer distances (5-10 m) the measured concentrations were higher than predicted The highest two-minute mean intake air concentration was 0.5% of the exhaust air concentration. This relative concentration is smaller than the odour threshold value of 0.6%. The averaging time over which concentrations were measured is important. In this study two-minute averages were used. Instantaneous values were almost an order of magnitude higher. On the basis of the tests performed so far (exhaust and intake are located on the same straight wall, exhaust jet and wind have no obstruction and wind velocity is rather low), the wall exhaust system seems to be acceptable in residential buildings.
Original languageEnglish
Pages (from-to)381-386
Number of pages6
JournalBuilding and Environment
Volume29
Issue number3
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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Ventilation exhausts
Ventilation
ventilation
air
Odors
Air
Roofs
odor
roof
Video recording
Vents
Air intakes
Cooking
smoking
residential building
video recording
wind velocity
tracer
building
Gases

Cite this

Kovanen, Keijo ; Heikkinen, Jorma ; Siitonen, Veijo. / Acceptability of wall exhaust discharges in residential ventilation. In: Building and Environment. 1994 ; Vol. 29, No. 3. pp. 381-386.
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title = "Acceptability of wall exhaust discharges in residential ventilation",
abstract = "The usual way of extracting the waste air from a building is to convey the air above the roof. However, it would be easier to install exhaust and intake vents on the outer wall of the building. This paper presents the results of full-scale experiments thal were carried out on a three-storey building using tracer gas and video recording. To assess the measured concentration on the building wall, the odour threshold values of exhaust air during cooking or smoking were used. The results were in agreement with the theory underlying the use of roof exhausts near the exhaust opening but at longer distances (5-10 m) the measured concentrations were higher than predicted The highest two-minute mean intake air concentration was 0.5{\%} of the exhaust air concentration. This relative concentration is smaller than the odour threshold value of 0.6{\%}. The averaging time over which concentrations were measured is important. In this study two-minute averages were used. Instantaneous values were almost an order of magnitude higher. On the basis of the tests performed so far (exhaust and intake are located on the same straight wall, exhaust jet and wind have no obstruction and wind velocity is rather low), the wall exhaust system seems to be acceptable in residential buildings.",
author = "Keijo Kovanen and Jorma Heikkinen and Veijo Siitonen",
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}

Acceptability of wall exhaust discharges in residential ventilation. / Kovanen, Keijo; Heikkinen, Jorma; Siitonen, Veijo.

In: Building and Environment, Vol. 29, No. 3, 1994, p. 381-386.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Acceptability of wall exhaust discharges in residential ventilation

AU - Kovanen, Keijo

AU - Heikkinen, Jorma

AU - Siitonen, Veijo

N1 - Project code: RTE14171

PY - 1994

Y1 - 1994

N2 - The usual way of extracting the waste air from a building is to convey the air above the roof. However, it would be easier to install exhaust and intake vents on the outer wall of the building. This paper presents the results of full-scale experiments thal were carried out on a three-storey building using tracer gas and video recording. To assess the measured concentration on the building wall, the odour threshold values of exhaust air during cooking or smoking were used. The results were in agreement with the theory underlying the use of roof exhausts near the exhaust opening but at longer distances (5-10 m) the measured concentrations were higher than predicted The highest two-minute mean intake air concentration was 0.5% of the exhaust air concentration. This relative concentration is smaller than the odour threshold value of 0.6%. The averaging time over which concentrations were measured is important. In this study two-minute averages were used. Instantaneous values were almost an order of magnitude higher. On the basis of the tests performed so far (exhaust and intake are located on the same straight wall, exhaust jet and wind have no obstruction and wind velocity is rather low), the wall exhaust system seems to be acceptable in residential buildings.

AB - The usual way of extracting the waste air from a building is to convey the air above the roof. However, it would be easier to install exhaust and intake vents on the outer wall of the building. This paper presents the results of full-scale experiments thal were carried out on a three-storey building using tracer gas and video recording. To assess the measured concentration on the building wall, the odour threshold values of exhaust air during cooking or smoking were used. The results were in agreement with the theory underlying the use of roof exhausts near the exhaust opening but at longer distances (5-10 m) the measured concentrations were higher than predicted The highest two-minute mean intake air concentration was 0.5% of the exhaust air concentration. This relative concentration is smaller than the odour threshold value of 0.6%. The averaging time over which concentrations were measured is important. In this study two-minute averages were used. Instantaneous values were almost an order of magnitude higher. On the basis of the tests performed so far (exhaust and intake are located on the same straight wall, exhaust jet and wind have no obstruction and wind velocity is rather low), the wall exhaust system seems to be acceptable in residential buildings.

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