Abstract
Problem statement: Impact of air exchange effectiveness on thermal comfort has not been investigated and, therefore, not well understood .Therefore, the influence of air exchange effectiveness on thermal comfort is investigated in this study. Approach: The main objective of this research is to investigate the thermal comfort level of an air-conditioned office room under 14 windows-door opening arrangements as a function of maximum, minimum and mean Air Exchange Effectiveness (AEE), as has not been inquired into already. The tracer gas decay method has been applied during the experimental procedures to estimate air exchange effectiveness, on the basis of room average and local mean age of air. Simultaneously, thermal comfort variables were measured and through these data, the thermal comforts Fanger's indices (PMV and PPD) were calculated. Staff answered a survey on their sensation of the indoor climate. Results: Results of 60 survey responses to thermal comfort questions in office and indoor air quality are presented. This study has shown that there are relationship between AEE and thermal comfort and three linear regression equations of PMV versus AEE can be derived for this air-conditioned office. Conclusion: Studies on the effect of air exchange effectiveness on thermal comfort in an office have shown that Thermal comfort is influenced by AEE, which go beyond the six factors which have been taken into account in PMV modeling.
Highlights
Indoor air quality and thermal comfort are two important aspects of indoor environmental quality that receive considerable attention[1]
With the emergence of energy shortages, climatic changes and sick building syndromes associated with the common usage of airconditioning, natural ventilation can be an appropriate solution for these deteriorating problems[5]
Experimental work was conducted in an office room at the 5th level of Mechanical Engineering Department office building Faculty of Engineering at University Putra Malaysia (UPM)
Summary
Indoor air quality and thermal comfort are two important aspects of indoor environmental quality that receive considerable attention[1]. The study of thermal comfort is very important because it is correlated with occupants' comfort, and with energy consumption[2]. Malaysia’s energy consumption has increased and become comparable to larger energy consumers worldwide. Age of air is an important index to evaluate indoor air quality and air exchange effectiveness greatly influences the indoor air quality, so has become more and more concerned in the past decades In order to assess the air exchange effectiveness and air distribution in room and building, a lot of parameters or indices have been proposed, but the age of air concept is currently used[6]. Applied the tracer-gas techniques to the experimental program, concentration decay of CO2 are used to measure age of air and calculate the air exchange effectiveness
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