Experimental study of thermal comfort in a field environment chamber with stratum ventilation system in winter

Cheng, Fanghui; Wu, Yuxin; Gao, Shuang; Liao, Chunhui; Cheng, Yong

doi:10.1016/j.buildenv.2021.108445

Cited by 31 publications

(5 citation statements)

References 53 publications

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“…Hence, in this section, the thermal performances of children were analyzed respectively for naturally ventilated classrooms and mechanical ventilated classrooms. And the types of the mechanical ventilation system are discussed in reference [60] and illustrated in Figure 7. The references reviewed in this section have been summarized in Table 3, presenting the characteristics of the education levels, ventilation operation modes, age groups, etc.…”

Section: Thermal Comfort In Primary School and Secondary Schoolmentioning

confidence: 99%

Interaction between Thermal Comfort, Indoor Air Quality and Ventilation Energy Consumption of Educational Buildings: A Comprehensive Review

Jia¹,

Han²,

Chen

et al. 2021

Buildings

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Thermal comfort and indoor air quality (IAQ) of educational buildings can affect students’ academic performance and well-being and are closely related to ventilation energy consumption. Demands of the indoor environmental quality within the classroom generally vary with the education levels and result in ventilation energy consumption accounting for a considerable proportion of the total energy use in bulk educational buildings. Its huge energy-saving potential is attracting worldwide attention from scholars and governments. Therefore, appropriate operation strategies of ventilation systems should be adopted to effectively reduce energy consumption without sacrificing thermal comfort and IAQ. However, the absence of relevant standards and guidelines for designing a quality classroom environment considering the special features of educational buildings remains an important research question. This study conducts a comprehensive review to determine research gaps and identify future directions for the interaction between thermal comfort, IAQ and ventilation energy consumption for educational buildings. The review results show that: (1) The thermal comfort prediction model should consider the influences of genders, ages and socioeconomic backgrounds; (2) The mixed-mode ventilation coupling the natural and mechanical approaches is preferred given its advantage of lower energy consumption and improved thermal comfort, but its control strategies need further exploration; (3) Optimizing passive design parameters of buildings (e.g., window to wall ratios, window orientations and sun shading installations) can significantly reduce the ventilation demands while maintaining indoor thermal comfort; (4) More studies are required for investigating thermal comfort in educational buildings during the heating period; and (5) IAQ of university buildings clearly requires further studies, especially on bacterial and fungal aerosol pollutants, for a more comprehensive assessment of the built environment.

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Section: Thermal Comfort In Primary School and Secondary Schoolmentioning

confidence: 99%

Interaction between Thermal Comfort, Indoor Air Quality and Ventilation Energy Consumption of Educational Buildings: A Comprehensive Review

Jia¹,

Han²,

Chen

et al. 2021

Buildings

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“…Although this study focuses on mixing ventilation with a uniform indoor thermal environment, the two-scenariosbased evaluation framework (Section 2.2) can be used to compare the performances of the two occupancy-aided ventilation methods under non-uniform air distribution such as stratum ventilation (Cheng et al 2022a), attachment ventilation (Yin et al 2021) and displacement ventilation (Fan et al 2022) in the future. This study evaluates the airborne infection risk from the perspective of the individual indicated by the mean rebreathed fraction as the existing studies do (Rudnick and Milton 2003;Andrews et al 2013;Li et al 2022).…”

Section: Discussionmentioning

confidence: 99%

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

2022

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Ventilation is an important engineering measure to control the airborne infection risk of acute respiratory diseases, e.g., Corona Virus Disease 2019 (COVID-19). Occupancy-aided ventilation methods can effectively improve the airborne infection risk control performance with a sacrifice of decreasing working productivity because of the reduced occupancy. This study evaluates the effectiveness of two occupancy-aided ventilation methods, i.e., the continuously reduced occupancy method and the intermittently reduced occupancy method. The continuously reduced occupancy method is determined by the steady equation of the mass conservation law of the indoor contaminant, and the intermittently reduced occupancy method is determined by a genetic algorithm-based optimization. A two-scenarios-based evaluation framework is developed, i.e., one with targeted airborne infection risk control performance (indicated by the mean rebreathed fraction) and the other with targeted working productivity (indicated by the accumulated occupancy). The results show that the improvement in the airborne infection risk control performance linearly and quadratically increases with the reduction in the working productivity for the continuously reduced occupancy method and the intermittently reduced occupancy method respectively. At a given targeted airborne infection risk control performance, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the working productivity by up to 92%. At a given targeted working productivity, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the airborne infection risk control performance by up to 38%.

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“…If data were not normally distributed, a nonparametric Wilcoxon test was adopted. 45 All results were considered statistically significant when p < 0.05 and particularly significant when p < 0.01. Significant tests on the votes of overall and local thermal sensation and overall and local thermal comfort were carried out.…”

Section: Methodsmentioning

confidence: 99%

Experimental study on the supply air characteristics and thermal comfort of a novel personalized ventilation air terminal device

Feng

Liao

Cheng

2023

Indoor and Built Environment

Self Cite

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Personalized ventilation (PV) has a significant potential for improving thermal comfort, inhaled air quality and energy efficiency. A novel PV air terminal device (ATD) based on the function of bath showers was evaluated to determine discomfort related to thermal sensation, draughts, dry eyes and skin irritation. The supply air characteristics and thermal comfort were analyzed using objective and subjective experiments in an environmental chamber. Thirty college students participated in the subjective experiments. Results showed that the proposed PV ATD could provide uniform distributions of air velocity at the human head and chest. Compared with the conventional round-monitor panel ATD, the proposed PV ATD can provide an improved cooling effect, wherein overall thermal sensation was reduced by 0.56 scale, showing a potential for energy saving. Moreover, the proposed PV ATD could produce a highly uniform distribution of local thermal sensation (LTS). Compared with the conventional PV, the proposed PV ATD could reduce the standard deviation of distribution of LTS by 41.7% and reduce overall thermal discomfort by 45.5%. Fewer sick building syndrome symptoms at a lower supply airflow rate of 6.3 L/s was achieved. Consequently, the proposed PV ATD could improve the comfort performance with the usage of lower supply airflow rates.

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Experimental study of thermal comfort in a field environment chamber with stratum ventilation system in winter

Cited by 31 publications

References 53 publications

Interaction between Thermal Comfort, Indoor Air Quality and Ventilation Energy Consumption of Educational Buildings: A Comprehensive Review

Interaction between Thermal Comfort, Indoor Air Quality and Ventilation Energy Consumption of Educational Buildings: A Comprehensive Review

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

Experimental study on the supply air characteristics and thermal comfort of a novel personalized ventilation air terminal device

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