Evaluation of cooling ceiling and mechanical ventilation systems on thermal comfort using CFD study in an office for subtropical region

Chiang, Wei‐Hwa; Wang, Chia-Ying; Huang, Jiansheng

doi:10.1016/j.buildenv.2011.09.002

Cited by 137 publications

(58 citation statements)

References 16 publications

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“…The ability to deal with complex flows within built environments has made CFD an important tool in improving building health and safety ( [9], [10]); ensuring thermal comfort for the occupants ( [11], [12]); testing energy efficient designs ( [13], [14]); and applying required environmental conditions ( [15], [16]). …”

Section: Objectivesmentioning

confidence: 99%

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Hajdukiewicz

Geron

Keane

2013

Building and Environment

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Section: Objectivesmentioning

confidence: 99%

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Hajdukiewicz

Geron

Keane

2013

Building and Environment

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“…10) in the hot and humid climate of Singapore. Chiang et al claimed that a supplementary ventilation system is indispensable when implementing a radiant cooling system in the subtropical climate of Taiwan, because the ventilation system can enhance the cooling capacity of the cooling ceiling [114]. Memon et al showed that cooling towers can be used to regenerate cooling water for the radiant cooling system in the hot and humid climate of Pakistan [115].…”

Section: )mentioning

confidence: 99%

Ten questions about radiant heating and cooling systems

Rhee

Olesen²,

Kim

2017

Building and Environment

254

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“…Since then CFD has become an important scientific tool to predict indoor airflow and ventilation system performance; see e.g. Awbi (1989), Awbi (1998), Tian et al (2006), Lau and Chen (2007) and Chiang et al (2012). It is worth mentioning that it is necessary to validate the reliability of the CFD program with measurements prior to utilizing its advantages, as there are some uncertainties related to CFD simulations.…”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Chen¹

2014

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A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO 2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept.In an impinging jet ventilation system, a high momentum of air jet is discharged downwards, strikes the floor and spreads over it, thus distributing the fresh air along the floor in the form of a very thin shear layer. This system retains advantages of mixing and stratification from conventional air distribution methods, while capable of overcoming their shortcomings.The aim of this thesis is to reach a thorough understanding of impinging jet ventilation for providing a good thermal environment for an office, by using Computational Fluid Dynamics (CFD) supported by detailed measurements. The full-field measurements were carried out in two test rooms located in a large enclosure giving relatively stable climate conditions. This study has been divided into three parts where the first focuses on validation of numerical investigations against measurements, the second addresses impacts of a number of design parameters on the impinging jet flow field and thermal comfort level, and the third compares ventilation performance of the impinging jet supply device with other air supply devices intended for mixing, wall confluent jets and displacement ventilation, under specific room conditions. In the first part, velocity and temperature distributions of the impinging jet flow field predicted by different turbulence models are compared with detailed measurements. Results from the non-isothermal validation studies show that the accuracy of the simulation results is to a great extent dependent on the complexity of the turbulence models, due to complicated flow phenomena related to jet impingement, such as recirculation, curvature and instability. The f v  2 turbulence model shows the best performance with measurements, which is slightly better than the SST k-ω model but much better than the RNG k-ε model. The difference is assumed to be essentially related to the magnitude of turbulent kinetic energy predicted in the vicinity of the stagnation region. Results from the isothermal study show that both the SST k-ω and RNG k-ε models predict similar wall jet behaviours of the impinging jet flow. IVIn the second part, three sets of parametric studies were carried out by using validated CFD models. The first parametric study shows that the geometry of the air supply system has the most significant impact on the flow field. The rectangular air supply device, especially the one with larger aspect ratio, provides a longer penetration distance to the room, which is suitable for industrial ventilation. The second study reveals that the interaction effect of cooling ceiling, heat sources ...

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Evaluation of cooling ceiling and mechanical ventilation systems on thermal comfort using CFD study in an office for subtropical region

Cited by 137 publications

References 16 publications

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Calibrated CFD simulation to evaluate thermal comfort in a highly-glazed naturally ventilated room

Ten questions about radiant heating and cooling systems

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

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