Ph.D. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: In this study, contaminant distribution for different room dimensions, opening positions and operating parameters are investigated experimentally and numerically. For this purpose, the effect of air change rate (air change per hour – ACH), inlet/outlet opening location and displacement ventilated & floor heated environment on contaminant distribution are evaluated. Experimental part is completed in a reduced scale model room. Operating parameters are specified regarding to similarity phenomena so that the results obtained are credible for full scale rooms. Flow visualization studies are carried out besides air velocity, air temperature and concentration measurements. In the numerical part RNG k – ε turbulence model is used to analyze the air flow distribution. Within the specified flow field particle trajectories are tracked by using discrete phase modeling (DPM). Moreover, air age, air change efficiency (ACE) and contaminant removal effectiveness (CRE) are calculated. It is seen that increasing ACH may be inadequate in reducing concentration of the air under varying contaminant loads. It is also specified that under constant contaminant load cases the effect of ACH on reducing indoor concentration depends on contaminant source position. It is determined that the contaminant distribution is developed as a function of opening and source locations. It can be stated for a displacement ventilated and floor heated indoor environment that contaminant distribution shows an evolving character up to operating parameter, particle source height and outlet opening position.
Key Words: Indoor air quality, Particle dispersion, Air change rate, Opening position, Displacement ventilation & Floor heating | |||||||||||||||||||||