On the calculation of heat migration in thermally stratified environment of large space building with sidewall nozzle air-supply

Wang, Haidong; Zhou, Pengzhi; Guo, Chunsheng; Tang, Xiaocen; Xue, Yuantao; Huang, Chen

doi:10.1016/j.buildenv.2018.10.003

Cited by 35 publications

(10 citation statements)

References 30 publications

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“…Yong Wang et al [20] research on the air conditioning system in a large space shows that the air supply speed, air supply angle, and air supply temperature are increased reasonably, and the air supply height is appropriately reduced, and the airflow organization effect is good. Comparing the main influencing factors, it is found that the influence of the air supply speed and cooling temperature difference is strong, while the influence of air supply height, air supply angle and air vent specifications is weak [21]. The air distribution diagram of a stratified air conditioner is shown in Figure 1.…”

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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“…The most important reason is that the proportion of large-scale or large space public buildings in the building sector-for instance, transportation buildings-has been rising rapidly [4]. Large space buildings refer to those that have great floor height, large enclosed space volumes, and diverse ventilation systems [5]. Energy consumption of transportation buildings per square metre is two to three times that of conventional public buildings such as offices and schools, indicating their greater impact on energy and environment [6] (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Reduction Strategies for Greenhouse Gas Emissions from High-Speed Railway Station Buildings in a Cold Climate Zone of China

Wang

Satoła

Wiberg³

et al. 2020

Sustainability

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Implementing China's emission reduction regulations requires a design approach that integrates specific architectural and functional properties of railway stations with low greenhouse gas (GHG) emission. This article analyzes life cycle GHG emissions related to materials production, replacement and operational energy use to identify design drivers and reduction strategies implemented in high-speed railway station (HSRS) buildings. A typical middle-sized HSRS building in a cold climate zone in China is studied. A detailed methodology was proposed for the development and assessment of emission reduction strategies through life cycle assessment (LCA), combined with a building information model (BIM). The results reveal that operational emissions contribute the most to total GHG emissions, constituting approximately 81% while embodied material emissions constitute 19%, with 94 kgCO 2eq /m 2 ·a and 22 kgCO 2eq /m 2 ·a respectively. Optimizing space can reduce operational GHG emissions and service life extension of insulation materials contributes to a 15% reduction in embodied GHG emissions. In all three scenarios, the reduction potentials of space, envelope, and material type optimization were 28.2%, 13.1%, and 3.5% and that measures for reduced life cycle emissions should focus on space in the early stage of building design. This study addresses the research gap by investigating the life cycle GHG emissions from HSRS buildings and reduction strategies to help influence the design decisions of similar projects and large space public buildings which are critical for emission reduction on a larger scale.

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“…where eff k is the effective thermal conductivity of air (which may be higher than the physical thermal conductivity of air, air k , due to turbulence mixing [20,28]…”

Section: Descriptionmentioning

confidence: 99%

Validation of a transient zonal model to predict the detailed indoor thermal environment: Case of electric radiators and wood stoves

Georges

Thalfeldt

Skreiberg

et al. 2019

Building and Environment

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In building performance simulation (BPS), zonal models are intermediate models between standard models assuming perfectly-mixed room air and Computational Fluid Dynamics (CFD): they aim to predict the air temperature and velocity fields as well as the pollutant distribution inside a room using a computational time significantly lower than using CFD. The article aims at validating a transient zonal model that is currently implemented in the commercial BPS tool, IDA ICE. In theory, this onedimensional model can address a large variety of airflows and requires almost no a priori knowledge of the flow to be computed. The model is validated against measurements in a laboratory heated by either electric radiators or an electric stove designed to mimic surface temperatures of real stoves. Unlike radiators, the case of stoves has never been addressed in the literature and is challenging due to the strong thermal coupling between the room air and walls. Heat emitters have been placed either in the middle of the room or along walls. The zonal model remarkably well predicts the time evolution of the air temperature stratification in the room for all test cases. For a heat emitter in a central position, the wall surface temperatures are predicted correctly. Nevertheless, for a heat emitter along walls, these walls cannot be considered isothermal anymore, an assumption found in most BPS tools. The paper suggests that an automatized method to divide walls in the vicinity of heat emitters is necessary for a reliable prediction of the wall surface temperatures.

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On the calculation of heat migration in thermally stratified environment of large space building with sidewall nozzle air-supply

Cited by 35 publications

References 30 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

Reduction Strategies for Greenhouse Gas Emissions from High-Speed Railway Station Buildings in a Cold Climate Zone of China

Validation of a transient zonal model to predict the detailed indoor thermal environment: Case of electric radiators and wood stoves

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