Measurement of ventilation rates using tracer gas method in walk-in stability chamber

Husain, Adnan and Md Yusof, Mohamad Zainal and Zamri Tan, Nurul Zakiah and Mohd Basir, Ishak and Leman, Abdul Mutalib (2009) Measurement of ventilation rates using tracer gas method in walk-in stability chamber. Proceedings - 6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009, 2 .

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Abstract

As standard and performance of Walk in Stability Chamber (WiSC) at Universiti Tun Hussein Onn Malaysia (UTHM) has been determined from the previous studies, the current research is focused to establish protocol for air change rate (ACH) measurement inside chamber for various experimental studies on designing for human needs. The scopes include the preparation of zone selection, volume of tracer gas, injecting procedure, mixing time, sampling technique and the interval time within sample. All procedures were to follow ASTM Standard E471 to ensure the accuracy and validity of the data collected. Data collection started within three month from December 2007 to February 2008. Air temperature and relative humidity were set at 24°C and 60% to 70% respectively. An automated tracer gas monitor using SF6 gas as a tracer gas was employed for air change rate measurement. The environmental parameters measured are air temperature, relative humidity, Carbon Dioxide (CO2) and Carbon Monoxide (CO) gases using Indoor Air Quality (IAQ) meter. The results were compared to the ASHRAE Standard 62.1-2004, ASHRAE Standard 55-2004 and U.S. EPA Standard. From the result, the average air change rate per hour (ACH) in the WiSC was 0.598 +/- 0.049 ACH while an average R2 was 0.961. The minimum air change rate was 0.549 ACH while 0.647 ACH was the maximum. The ventilation rates calculated was 1.983 L/s per person for 23.04m2 with four occupants. Mean while, the air temperature was in the range of 23.2°C to 25.4°C and maximum CO2 and CO gases concentration are 836 ppm and 15.80 ppm respectively. As a conclusion the ventilation rates inside WiSC was determine. For further study for many types of building, a wide of data collection is needed. Weather changes and type of mechanical ventilation system used has to take into careful attention. The implication of this study is, for next experiment that involving other type of encloses building this method can be carried out with an improvement of the tracer gas method.

Item Type:Article
Uncontrolled Keywords:air change rates; air temperature; ASTM standards; current researches; data collection; environmental parameter; EPA standards; experimental studies; human needs; IAQ; indoor air quality; interval time; Malaysia; mechanical ventilation system; mixing time; relative humidities; sampling technique; stability chambers; tracer gas; ventilation rate; ventilation rates; weather change; WiSC ; zone selection
Subjects:T Technology > TP Chemical technology > TP363 Heating, drying, cooling, evaporating
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Manufacturing and Industrial Engineering
ID Code:3117
Deposited By:En. Shahrul Md Rizal Shamshuri
Deposited On:06 Mar 2013 12:04
Last Modified:06 Mar 2013 12:04

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