Experimental study on effect of the air flow rate on ventilation effectiveness in lecture room
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 Ve...
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| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1997/ http://eprints.uthm.edu.my/1997/1/Mohd_Shahrizal_Salleh_FKMP_(QIR2011)pdf.pdf |
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| Summary: | 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. |
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