Assessment of indoor air quality in an air-conditioning split units (ACSU) office building

Nurul Adilah Mohd Badroldin, . and Nor Azam Ramli, . and Mohd Rodzi Ismail, . and Nur Baitul Izati Rasli, . and Mohammad Zaip Ahmad, . Assessment of indoor air quality in an air-conditioning split units (ACSU) office building. pp. 266-284. ISSN 2672-7226

The indoor air quality (IAQ) in Air-Conditioning Split Units (ACSU) offices depends mainly on recirculated indoor air that has gone through filters. Workers usually spend eight hours in the office space with restricted air circulation. An IAQ assessment was conducted at the administrative office space USM to investigate conditions in an ACSU office space; from 8.00 a.m. to 6.00 p.m. It starts with a walkthrough survey followed by the filling of questionnaires with a sample size of 11 workers for insights into the office operations. The specific physical parameters (T RH and AM) and indoor air contaminants (CO CH‚‚ O O‚ PM‚�‚ TVOC TBC TFC and CO‚‚ ) were conducted at three points indoor and one point outdoor. The T and RH were within the acceptable range of 23-26C and 40-70 respectively by ICOP while the AM was very low and less than the acceptable threshold range of 0.15-0.5 m/s at 0.08 m/s 0.04 m/s and 0.02 m/s at Point 1 Point 2 and Point 3 respectively. The indoor air contaminants (CO CH‚‚ O O‚ TVOC PM‚�‚ and TFC) met the standard level of ICOP except for TBC and CO‚‚ . TBC exceeded the ICOP limit (500 cfu/m) at 1000 cfu/m and 1500 cfu/m at Point 1 and Point 2 respectively whereas CO‚‚ concentrations exceeded it (1000 ppm) at 1008.93 ppm at Point 2. In essence the results indicated that the ACSU office space with restricted air circulation was inadequately ventilated as the AM were low resulting in high CO‚‚ concentrations and high TBC. Secondly the indoor air contaminants (CO CH‚‚ O TVOC and CO‚‚) were higher than those outdoors. The questionnaire survey results reported that the highest present symptom experienced by the workers was drowsiness with 64 . Therefore it is prudent to ensure the IAQ is within the acceptable limit to avoid any possible health effects on workers within an office space.

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Abstract

The indoor air quality (IAQ) in Air-Conditioning Split Units (ACSU) offices depends mainly on recirculated indoor air that has gone through filters. Workers usually spend eight hours in the office space with restricted air circulation. An IAQ assessment was conducted at the administrative office space USM to investigate conditions in an ACSU office space; from 8.00 a.m. to 6.00 p.m. It starts with a walkthrough survey followed by the filling of questionnaires with a sample size of 11 workers for insights into the office operations. The specific physical parameters (T RH and AM) and indoor air contaminants (CO CH‚‚ O O‚ PM‚�‚ TVOC TBC TFC and CO‚‚ ) were conducted at three points indoor and one point outdoor. The T and RH were within the acceptable range of 23-26C and 40-70 respectively by ICOP while the AM was very low and less than the acceptable threshold range of 0.15-0.5 m/s at 0.08 m/s 0.04 m/s and 0.02 m/s at Point 1 Point 2 and Point 3 respectively. The indoor air contaminants (CO CH‚‚ O O‚ TVOC PM‚�‚ and TFC) met the standard level of ICOP except for TBC and CO‚‚ . TBC exceeded the ICOP limit (500 cfu/m) at 1000 cfu/m and 1500 cfu/m at Point 1 and Point 2 respectively whereas CO‚‚ concentrations exceeded it (1000 ppm) at 1008.93 ppm at Point 2. In essence the results indicated that the ACSU office space with restricted air circulation was inadequately ventilated as the AM were low resulting in high CO‚‚ concentrations and high TBC. Secondly the indoor air contaminants (CO CH‚‚ O TVOC and CO‚‚) were higher than those outdoors. The questionnaire survey results reported that the highest present symptom experienced by the workers was drowsiness with 64 . Therefore it is prudent to ensure the IAQ is within the acceptable limit to avoid any possible health effects on workers within an office space.

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Item Type:	Article
AGROVOC Term:	Ventilation
AGROVOC Term:	Atmospheric circulation
AGROVOC Term:	Air conditioning
AGROVOC Term:	Split applications
AGROVOC Term:	office
AGROVOC Term:	Biological contamination
AGROVOC Term:	Health risks
AGROVOC Term:	Health hazards
AGROVOC Term:	Public health
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9969

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