Optimum ventilation based on the overall ventilation effectiveness for temperature distribution in ventilated cavities

Xamán, J.; Tun, J.; Álvarez, G.; Chávez, Y.; Noh, F.

doi:10.1016/j.ijthermalsci.2008.12.008

Cited by 36 publications

(13 citation statements)

References 19 publications

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“…Because the efficiency of heat transfer across the substrate/susceptor interface was sufficiently high by virtue of the vacuum chuck system [13], the susceptor temperature was considered to be almost equal to the temperature of the back surface of substrate (T sub ). This enabled us to estimate T surf adequately from the heat flux from the plasma, the thermal conductivity of the substrate material and T sub by carrying out timedependent simulations on temperature distributions around the plasma region using the PHOENICS software, which is a general-purpose three-dimensional numerical simulator for flow and heat transfer [14][15][16].…”

Section: Methodsmentioning

confidence: 99%

Characterization of microcrystalline Si films deposited at low temperatures with high rates by atmospheric‐pressure plasma CVD

Ouchi

Tabuchi

Ohmi

et al. 2010

Phys. Status Solidi (c)

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Low‐temperature and high‐rate depositions of hydrogenated microcrystalline silicon (μc ‐Si:H) films are investigated using stable plasma excited at atmospheric pressure (AP) by supplying 150‐MHz very high‐frequency (VHF) power. VHF power density, H2/SiH4 ratio and plasma gap are varied as parameters under a fixed substrate temperature (Tsub) of 220 ΩC. Increasing VHF power density and H2/SiH4 ratio is primarily important for the sufficient decomposition of source gas molecules, improving both deposition rate and film property. In addition, the plasma gap is found to be another crucial parameter in the deposition process using AP‐VHF plasma. Numerical analyses on the temperature distribution around the plasma region have revealed that the steady‐state surface temperature of the glass substrate becomes approximately 100 ΩC higher than the back surface temperature (Tsub), which is caused by the moderate surface heating effect of the AP‐VHF plasma. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Methodsmentioning

confidence: 99%

Characterization of microcrystalline Si films deposited at low temperatures with high rates by atmospheric‐pressure plasma CVD

Ouchi

Tabuchi

Ohmi

et al. 2010

Phys. Status Solidi (c)

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“…Moureh and Flick (2005), combined numerical and experimental parametric study of inlet and outlet positions of a ventilated cavity and showed how to improve environmental parameters such as temperature and contaminant concentration inside the cavity. More recently Xaman et al (2009) presented results of a numerical study to find the optimum ventilation configuration for overall ventilation effectiveness for temperature distribution inside a ventilated cavity. However, although these authors claim to have found an optimum design through their parametric studies, none of them considered the use of formal techniques of optimization to achieve their results.…”

Section: Problem Formulation: Fluid Flow In a Cavitymentioning

confidence: 99%

Development of a numerical optimization approach to ventilation system design to control airborne contaminant dispersion and occupant comfort

2012

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“…Subudhi et al [33] concluded from their study that natural ventilation depends on the position and size of the openings. Xamán et al [34], Macias-Melo et al [35], Serrano-Arellano et al [36] and Xamán et al [37] too established that ventilation, and hence, thermal comfort is dependent on the position of the opening. Moosavi et al [38] did a comprehensive review of earlier studies done for different design considerations in a building to obtain an optimum and effective ventilation and suggested the outlet opening size as the most influential parameter affecting the behaviors of the ventilation pattern along with the indoor thermal condition.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of a naturally ventilated system using PMV models for different roof inclinations in composite climatic conditions

Vaishnani

Ali

Joshi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Computational analysis has become a very useful tool for a detailed understanding of building physics before actual building constructions and for predicting such system behaviors where massive urbanizations are envisaged. The present study attempts to describe the efficacies of CFD as an "analysis led design" tool, where a computationally modeled cross-ventilation system with asymmetric positions of openings is analyzed to estimate the comfort zones according to the PMV (predicted mean vote) model for evaluating the influence due to roof inclinations, thereby providing opportunities in rectifying any anomalies pertaining to it, prior to the actual construction. A numerical analysis has been carried out to examine the effects of natural ventilation in a wind-driven system using the established extended PMV model (PMV e). The study focuses on thermal comfort and the effect of roof inclination angle over the three different weather conditions in Delhi-winter season (high humidity and low temperature), summer season (low humidity and high temperature) and monsoon season (high humidity and mild temperature). Appropriate roof inclination angles provide a better ventilation rate and air distribution pattern, which significantly affects comfort condition. Study shows that for winter season, the PMV values decrease as the roof inclination angle is increased and the ventilation rate for 30° inclined roof increases about 16% as compared to the flat roof case, while PMV values increase with roof inclination for summer season, signifying zone of discomfort. It also concludes that a moderate roof inclination is beneficial for monsoon season.

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Optimum ventilation based on the overall ventilation effectiveness for temperature distribution in ventilated cavities

Cited by 36 publications

References 19 publications

Characterization of microcrystalline Si films deposited at low temperatures with high rates by atmospheric‐pressure plasma CVD

Characterization of microcrystalline Si films deposited at low temperatures with high rates by atmospheric‐pressure plasma CVD

Development of a numerical optimization approach to ventilation system design to control airborne contaminant dispersion and occupant comfort

Thermal performance analysis of a naturally ventilated system using PMV models for different roof inclinations in composite climatic conditions

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