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Experimental study on effect of the air flow rate on ventilation effectiveness in lecture room

Salleh, Mohd Shahrizal and Hariri, Azian and Leman, Abd Mutalib (2011) Experimental study on effect of the air flow rate on ventilation effectiveness in lecture room. In: 12th International Conference on QiR (Quality in Research), 4-7 July 2011, Bali, Indonesia.


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This study is conducted to investigate the effect of the air flow rate of cassette ceiling air conditioning on the ventilation effectiveness in lecture room. This study was done by analyzing the measurement data based on experiments conducted in the lecture room using measuring equipments such as Velocicalc, Accubalance Capture Hood and Q-Trak. Parameters consider in this study is CO2, CO, relative humidity (RH), air flow rate, air velocity and temperature. Nine points had been selected to calculate the average parameters value and the experiment was carried out repetitively with different air flow rates (low, medium and high). Despite of 80 students occupied the room with two out of ceiling cassette air-conditioning in these experiments were not unable to fully operate with its maximum performance, the result obtained shows that the lecture room’s concerning parameters for indoor air quality was still under the allowable limit suggested by ASHRAE for all investigated flow rate. The increase in flow rate should increase the ventilation effectiveness, since the indoor CO2 concentration was oppositely decreased as the flow rate increased. However, through simple mass balance calculation, the ventilation effectiveness for pollutant removal was calculated only on pollutant dispersion. This is caused by the simple mass equation derived from 1D steady state and cannot predict 3D effect such as the recirculation and stagnation zone. It is suggested to investigate this study through CFD analysis to understand the 3D effect for more accurate ventilation effectiveness analysis.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: air flow rate; IAQ; ventilation effectiveness; air conditioning
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD881-890 Air pollution and its control
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 05 Oct 2011 03:55
Last Modified: 05 Oct 2011 04:25
URI: http://eprints.uthm.edu.my/id/eprint/1997
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