Influence of air-conditioning systems on buoyancy driven air infiltration in large space buildings: A case study of a railway station

Liu, Xiaochen; Liu, Xiaohua; Zhang, Tao

doi:10.1016/j.enbuild.2020.109781

Cited by 44 publications

(13 citation statements)

References 32 publications

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“…When the stratified air conditioner is operated alone, part of the air is affected by thermal buoyancy and rises and stays in the non-air-conditioned area. When it is operated in conjunction with natural ventilation, part of the stagnant hot air is discharged outside through the induction of natural ventilation, effectively reducing the retention of hot air in the upper non-air-conditioned area [22]. It can be seen that the use of natural ventilation in the stratified air conditioning system improves the quality of the indoor thermal environment and reduces the heat consumed by the ventilation and cooling system [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

et al. 2021

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Stratified air distribution systems are commonly used in large space buildings. The research on the airflow organization of stratified air conditioners is deficient in terms of the analysis of multivariable factors. Moreover, studies on the coupled operation of stratified air conditioners and natural ventilation are few. In this paper, taking a Shanghai Airport Terminal departure hall for the study, air distribution and thermal comfort of the cross-section at a height of 1.6 m are simulated and compared under different working conditions, and the effect of natural ventilation coupling operation is studied. The results show that the air distribution is the most uniform and the thermal comfort is the best (predicted mean vote is 0.428, predicted percentage of dissatisfaction is 15.2%) when the working conditions are 5.9% air supply speed, 11 °C cooling temperature difference and 0° air supply angle. With the coupled operation of natural ventilation, the thermal comfort can be improved from Grade II to Grade I.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

et al. 2021

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“…In 2015, existing buildings accounted for approximately 30% of global energy final consumption and 28% of energy-related greenhouse gas emissions [2] . Large buildings, which are different from ordinary buildings such as residences and offices, have enclosed spaces with high internal height, but to some extent, they are used by internal occupants [3] . This type of build-ing today in metropolises such as airport terminals [4][5][6] , railway stations [7] , commercial buildings [8] , stadiums [9] , theaters [10] , buildings industries [11] are extensive.…”

Section: Introductionmentioning

confidence: 99%

“…Also, to improve the current design standards, interior design air parameters contribute to low energy consumption and comfortable surface. Chen Liu et al [3] showed that air conditioning systems have a significant effect on air infiltration in large space buildings. A CFD model was created from a railway station with conventional air conditioning systems, for example, mixed ventilation (MV), displacement ventilation (DV), and radiant floor with displacement ventilation (RF + DV).…”

Section: Introductionmentioning

confidence: 99%

Analysis and Evaluation of Thermal-cooling Loads of Office Buildings Using Carrier Software in Iran

Ghodusinejad¹,

Zahedi²,

Gitifar³

et al. 2022

j. of smar. build. and constr. technol.

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The importance and necessity of energy saving in the world have been discussed for many years, but achieving a logical and transparent solution isstill one of the main challenges and problems of the world’s economy. Therapid growth of energy consumption in the last two decades has caused thesecurity of the domestic energy supply of buildings to face serious problems. In this research, first by entering parameters such as the type of materials, doors and windows, and the type of soil on the floor connected to theground, etc. in the heat and cold load calculation software (HAP Carrier) asthe design calculations and then in the second step entering the specifications inferred from the Iran’s national building code as a reference for energy saving calculations, calculations are performed and compared as the firstcriterion, and finally these two outputs are compared. The actual energyconsumption and determination of the building energy consumption indexare determined as another criterion, as well as the degree of deviation fromthe actual consumption. The results showed that the theoretical method andthe thermal and refrigeration load calculations of the Zanjan Gas Companybuilding have 6% difference in cooling load but the heating load is about34% different, which means for cooling loads, the theoretical model can beused with high accuracy but for heating loads, the national building codeneeds fundamental changes.

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“…4 Therefore, the UFAD system has the advantages of providing better IAQ, 5 thermal comfort 2,[6][7][8] and energy efficiency. [9][10][11] Moreover, the UFAD system is efficient in large-space buildings, such as theatres, 1,12 large halls, 13,14 large offices, 15 railway station 16 and stadiums. 17 However, the experimental theatre has a lower ceiling height and the stepped layout results in a larger proportion of occupied zone in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Ceiling displacement ventilation system in an experimental theatre: A method to optimize thermal comfort

Wan

Liu

Zhang

et al. 2022

Indoor and Built Environment

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Compared to traditional theatres, experimental theatres have a lower floor height and the lights are closer to the audience. The large vertical temperature gradient caused by the underfloor air distribution (UFAD) system extremely impairs thermal comfort. Thus, an improved method by introducing the ceiling displacement ventilation (CDV) system was evaluated. CFD models of the experimental theatre were established and verified by field tests. The influence of designing and operation parameters of the CDV systems on thermal comfort was investigated. Effects on energy consumption and air quality were also analyzed to improve application feasibility. The results indicated that the increment of air temperature at the audience head (AHA temperature) was reduced by 51.0% with the help of the CDV system. Thermal comfort was improved as the installation height was extended higher. Furthermore, under constant total air supply rate, the AHA temperature of the last row was decreased with the increase in the air supply ratio of the UFAD to CDV systems (RUtoC), and the total power consumption was declined by 3.1% through adjusting RUtoC compared to the traditional UFAD system. Additionally, the air quality could be significantly improved. The results are helpful to the design and operation of HVAC systems in experimental theatres.

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Influence of air-conditioning systems on buoyancy driven air infiltration in large space buildings: A case study of a railway station

Cited by 44 publications

References 32 publications

Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

Numerical Study on Coupled Operation of Stratified Air Distribution System and Natural Ventilation under Multi-Variable Factors in Large Space Buildings

Analysis and Evaluation of Thermal-cooling Loads of Office Buildings Using Carrier Software in Iran

Ceiling displacement ventilation system in an experimental theatre: A method to optimize thermal comfort

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