A Study Of Ventilation And Carbon Dioxide In A Lecture Room

Norlidawati, Dadan (2006) A Study Of Ventilation And Carbon Dioxide In A Lecture Room. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This study was conducted to investigate the relationship between carbon dioxide (C02) concentration with air flow rate and indoor temperature inside a lecture room. Furthermore, it was conducted to determine the average and maximum carbon dioxide concentration in an occupied space. Lecture room that is using the mechanical ventilation system was selected as the occupied space for the physical measurement in this study. Environmental parameters considered in this study are C02 concentration, air flow rate, indoor temperature and relative humidity. Meanwhile the subjective measurement was involving 32 students as the untrained subjects. Their votes for Perceived Thermal Votes (PTVc), Perceived Airflow (PAF)and Skin Dryness (SD) were analyzed to determine their perception towards their environment. The measurement results stated that the C02 concentration was ranging from 769 - 2001 ppm, indoor temperature was ranging from 21.9 - 23.5°C, and the relative humidity was ranging from 54.4- 65.7%. All these values were compared to the recommended values given by ASHRAE Standard. The statistical model was also developed to obtain the relationship between COi concentration and air flow rate.Vote analysis conducted gave additional information regarding on the occupants' response towards the indoor environmental. Based on the result, majority of occupants (37.5 %) were having medium overall satisfactory level with their indoor environment. However, there were also large percentages of them (31.3%) to have low overall satisfactory level. Some suitable guidelines of building maintenance procedures were recommended based on the outcomes from this study.

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