Energy Benefit of the Underfloor Air Distribution System for Reducing Air-Conditioning and Heating Loads in Buildings

Lim, Tae Sub; Schaefer, Laura; Kim, Jeong Tai; Kim, Gon

doi:10.1177/1420326x11419345

Cited by 27 publications

(18 citation statements)

References 13 publications

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“…The performance of ventilation and air distribution systems not only influences the indoor air quality directly [11,12], but also strongly affects the total energy consumptions in buildings [13]. Among the evaluation indices referring to ventilation and air distribution systems, there are airflow patterns (such as trajectory, impingement, separation, circulation, reattachment, buoyancy, vortices etc) and airflow field (temperature, velocity and pressure).…”

Section: Introductionmentioning

confidence: 99%

Particle Tracking Velocimetry for indoor airflow field: A review

Biwolé

Mathis

2015

Building and Environment

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International audienceAirflow field measurement plays a significant role in creating a thermally comfortable indoor environment, by providing adequate quantitative information of indoor air distribution and local air velocity. In recent years, the Particle Tracking Velocimetry (PTV) technique has gradually become a promising and powerful tool for indoor airflow field measurement. This paper firstly gives an overview of the equipments and methods involved in typical PTV applications to indoor environments, and then introduces related applications of PTV for measuring indoor airflow fields. The Particle Streak Velocimetry (PSV) technique for indoor airflow measurement is also introduced. This paper shows how the quantitative and detailed turbulent flow information obtained by PTV measurement is critical for analyzing turbulent properties and developing numerical simulations. The limitations and future developments of PTV and PSV techniques are also discussed

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Section: Introductionmentioning

confidence: 99%

Particle Tracking Velocimetry for indoor airflow field: A review

Biwolé

Mathis

2015

Building and Environment

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“…The heating, ventilating, air-conditioning (HVAC) system is very important for buildings in sub-tropical and tropical climates and is a major contributor to energy consumption, 2,[9][10][11] and there have also been reports that air conditioners could have an impact on health of occupants. [12][13][14][15][16][17] As well as the energy consumption and CO 2 emission issue that are associated with the use of HVAC system, the use of refrigerant for air cooling would also pose greenhouse warming (global warming potential, GWP) and stratospheric ozone depletion potential (ODP) problems on the global environment.…”

Section: Introductionmentioning

confidence: 99%

A new comprehensive evaluating method for assessing the sustainability credentials of the central air-conditioning system

Ding

Zou

2016

Indoor and Built Environment

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A new comprehensive evaluation method for assessing the sustainability credential of central airconditioning systems is proposed in this paper. The method is based on the relative coefficient index (K) of costs and benefits of the air-conditioning system. The paper introduces the concept and defined the parameters of costs (energy consumption costs, economic running costs and environmental impact) and benefits (indoor air quality and thermal comfort) and the mathematical principles for the determination and evaluation of these parameters. The parameters are then ranked with an index value for each component that make up the air-conditioning system, and the total index value would be used for the overall evaluation of the costs and benefits to determine the overall index, K. The feasibility of the method is illustrated by three case studies included in this paper. The evaluation index can identify shortcomings of components in the air-conditioning system and to identify the relative environmental impacts and costs as well as the performance in using the system. The evaluation index would thus allow designers and building managers to target performance improvements and guide designers to optimize functions in terms of costs and benefits to minimize environmental impacts. The index method would provide a rating classification of air-conditioning systems for standard specification and selection in terms of cost effectiveness for appropriate building service required.

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“…Moreover, some studies have been conducted to investigate the performance of UFAD for heating mode. Tae et al [5] used Energyplus to evaluate the energy performance of the UFAD and MV systems for heating and cooling in the interior zone of an theatre complex. Their study demonstrated that the heating energy consumption for UFAD was lower than that for MV during the winter heating season (from December to January).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Effects of Air Return Height on Performance of an Underfloor Air Distribution System for Heating and Cooling

Fan

Zheng

et al. 2020

Energies

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The exhaust/return-split configuration is regarded as an important upgrade of traditional under-floor-air-distribution (UFAD) systems due to its higher energy efficiency. Moreover, existing studies are mostly focused on the effect of the return vent height on the performance of an UFAD system under cooling conditions. Knowledge of the performance under heating conditions is sorely lacking. This paper presents a numerical evaluation of the performance characteristics of an UFAD system with six different heights of the return vents in heating operation by comprehensively considering thermal comfort, air quality, and energy consumption. The results show that, in the heating mode, the general thermal comfort (predicted mean vote-predicted percentage dissatisfied (PMV-PPD) values) and indoor air quality indices (mean age of air and volatile organic compounds (VOCs) concentration) were greatly improved and energy consumption was slightly reduced with a lower return vent height. Although these were opposite to the findings of our previous study regarding the performance in cooling mode, an optimal return vent height in terms of the comprehensive all-year performance can be recommended. This method provides insight into the design and optimization of the return vent height of UFAD for space heating and cooling.

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Energy Benefit of the Underfloor Air Distribution System for Reducing Air-Conditioning and Heating Loads in Buildings

Cited by 27 publications

References 13 publications

Particle Tracking Velocimetry for indoor airflow field: A review

Particle Tracking Velocimetry for indoor airflow field: A review

A new comprehensive evaluating method for assessing the sustainability credentials of the central air-conditioning system

Numerical Study on Effects of Air Return Height on Performance of an Underfloor Air Distribution System for Heating and Cooling

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