Article
Environmental Sciences
Chenxi Liao, Mizuho Akimoto, Mariya Petrova Bivolarova, Chandra Sekhar, Jelle Laverge, Xiaojun Fan, Li Lan, Pawel Wargocki
Summary: The survey found that bedrooms with mechanical ventilation tended to improve sleep quality, while having carpet or lacking mechanical ventilation in the bedroom may lead to sleep disturbance from stuffy air. The median PSQI score of respondents suggests generally low sleep quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Thermodynamics
Wei Yu, Yan Zhang, Chenqiu Du, Baizhan Li, Hong Liu, Yue Zhang, Shen Wei
Summary: A comfortable sleeping environment is crucial for improving sleep quality. This study conducted pre-sleep and during-sleep experiments to determine an optimal fan control strategy that mimics the circadian rhythm of sleep, resulting in increased sleep efficiency and proportion of deep sleep.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Construction & Building Technology
Xiaojing Zhang, Guanzhang Luo, Jingchao Xie, Jiaping Liu
Summary: This study found that in naturally ventilated bedrooms during transition seasons with mild outdoor climate, a slightly warmer pre-sleep environment than neutral is beneficial for sleep quality, with a positive impact on the percentage of deep sleep. Additionally, indoor air quality is significantly correlated with sleep quality.
Article
Thermodynamics
Jingxian Xu, Yehu Lu, Lanjun Yin, Haibo Song
Summary: This study aimed to find the preferred thermal properties of sleeping bags for children and provide guidance for engineers and adults on dressing and choosing appropriate sleeping bags. Regression equations were proposed to establish the relationship between skin temperature and fabric thickness, thermal conductivity, and air temperature.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Sheikh Ahmad Zaki, Mohamad Faizal Rosli, Hom Bahadur Rijal, Farah Nurhanis Hassan Sadzli, Aya Hagishima, Fitri Yakub
Summary: Most participants were thermally comfortable in both cases, with lower energy consumption and better thermal comfort reported in Case B. Sleep quality was reported to be calm and satisfied in both cases, with maintained Comfort temperature and Sleep Efficiency Index (SEI).
Article
Construction & Building Technology
T. W. Tsang, K. W. Mui, L. T. Wong
Summary: The study found that thermal comfort and satisfaction can influence university students' sleep quality, with females possibly choosing bedding with higher total thermal resistance in the same thermal conditions. Sleep quality is mainly influenced by thermal comfort and satisfaction, with thermally satisfied individuals and those with neutral thermal sensation having better sleep quality.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Cho Kwong Charlie Lam, Jian Hang, Dida Zhang, Qiong Wang, Meng Ren, Cunrui Huang
Summary: This study examines the relationship between short-term physiological and psychological thermal adaptation and outdoor thermal comfort of exercising people from different climate zones in China. Non-local students reported higher thermal sensation and discomfort under similar PET conditions, and physiological and psychological factors are both important in understanding thermal perception. Addressing thermal discomfort at an early stage can prevent more severe heat-related illnesses.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Yuxin Wu, Zixuan Zhang, Hong Liu, Baizhan Li, Baofan Chen, Risto Kosonen, Juha Jokisalo
Summary: There are differences in thermal perception and physiological responses between the elderly and young people in unstable thermal environments. The elderly have smaller variations and time lag in thermal responses, and reported less discomfort and complaints of sick building syndrome and perceived air quality. The skin temperatures of the arms and head of the elderly were lower in some conditions, indicating the need for more careful consideration of health risks.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Xiaxia Li, Bo Zhou, Liming Shen, Zhihui Wu
Summary: A study found that selecting suitable mattress materials can increase the interface temperature between the human body and mattress, thereby improving sleep quality. In colder climates, people tend to prefer a warm thermal sensation. More attention should be paid to thermal insulation of body extremities.
INDOOR AND BUILT ENVIRONMENT
(2021)
Article
Construction & Building Technology
Omar A. Ismail, Mahmoud A. Kassem, Muhammed A. Hassan
Summary: Sleeping pods with radiant cooling panels can maintain a comfortable thermal environment with high supply air temperature and relatively high panel temperature, reducing the risk of local thermal discomfort and condensation.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Chenxi Liao, Xiaojun Fan, Mariya Bivolarova, Jelle Laverge, Chandra Sekhar, Mizuho Akimoto, Anna Mainka, Li Lan, Pawel Wargocki
Summary: This study measured bedroom environment and sleep quality in actual bedrooms in Denmark and found a correlation between subjectively-assessed sleep quality and indoor air quality. The study also found that enhanced ventilation improved sleep quality and indoor air quality.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Heng Du, Zhiwei Lian, Dayi Lai, Lin Duanmu, Yongchao Zhai, Bin Cao, Yufeng Zhang, Xiang Zhou, Zhaojun Wang, Xiaojing Zhang, Zhijian Hou
Summary: This study compares indoor thermal environment and thermal comfort between radiant and convective systems in continuous operating mode. The analysis includes hypothesis tests on thermal environment parameters and human subjective responses. The results show evidence of overheating in radiant systems during heating season, but no practical difference in air temperature between the two systems during cooling season. The study also analyzes and compares different indexes, finding little practical difference in thermal comfort vote between the two systems at the same PMV interval. The findings provide insights for thermal environment design and thermal comfort evaluation under different HVAC systems.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Songtao Hu, Rujin Liu, Hui Li, Hui Zhu
Summary: Through an epidemiological investigation and experiment, it was found that air temperature plays a crucial role in the mucosal immunity of the respiratory system. The concentrations of immunoglobulin in the blood and saliva were positively correlated with indoor and outdoor temperatures, and keeping a higher air temperature can enhance mucosal immunity.
INDOOR AND BUILT ENVIRONMENT
(2023)
Article
Construction & Building Technology
Guanyu Fang, Shiming Deng, Xuefeng Liu
Summary: A bed-based ASHP (B-ASHP) system combining ASHP and Chinese-Kang heating system was proposed, with studies on design/operating parameters for sleeping thermal comfort. Factors like bed surface temperature, mattress and quilt thermal resistance have significant impacts on sleeping thermal comfort.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Xin Wang, Tianqi Liu, W. L. Lee
Summary: This study is the first attempt to investigate the optimal positioning for installation of reversible RACs in a representative bedroom. Through CFD simulations and experiments, it was found that slightly higher air diffusion performance indices (ADPIs) can be obtained when the reversible RAC is installed at high level on the longer side of the bedroom.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Junmeng Lyu, Jinbo Li, Zisheng Zhao, Xiongwei Miao, Heng Du, Dayi Lai, Yuxin Yang, Zhiwei Lian
Summary: This study analyzed the differences in household A/C temperature setpoint behaviors in three climate zones and applied five machine learning algorithms to model the A/C temperature setpoint behavior. The results showed that the behavior is related to time, indoor/outdoor air temperature, temperature setpoint before settings, and cumulative time the A/C is turned on. The ML algorithms performed well in predicting user behavior with large data sizes.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
Xinbo Xu, Li Lan, Yuxiang Sun, Zhiwei Lian
Summary: Noise exposure is common in urban areas, but its impact on sleep is still controversial. This field study aimed to conduct a comprehensive examination of the effects of noise exposure on sleep quality. The results showed that the majority of bedrooms did not meet the minimum requirements for noise levels, and a high percentage of participants experienced harmful noise. Additionally, the study found that noise exposure negatively affected both physiological and psychological aspects of sleep, with an impact on the duration of REM sleep, deep sleep, and subjective sleep quality.
BUILDING SIMULATION
(2023)
Article
Thermodynamics
Heng Du, Zhiwei Lian, Li Lan, Dayi Lai
Summary: Determining the required sample size in surveys of occupant responses to indoor environmental quality is crucial for reproducible and reliable results. This paper introduces statistical models to determine the sample size for different data analysis methods commonly used in this field. Monte Carlo simulations are used to verify the statistical methods and demonstrate the impact of sample size on study accuracy and reliability. Examples are provided to guide researchers in determining parameter values based on previous research or existing databases. The paper concludes that the required sample size can vary depending on the study design and outcome, and provides guidance on interpreting results when the desired sample size is not achievable.
BUILDING SIMULATION
(2023)
Article
Construction & Building Technology
Yan Yan, Li Lan, Mengyuan Kang, Haodong Zhang, Xiaojun Fan, David Peter Wyon, Pawel Wargocki
Summary: This study measured and examined the mechanisms impacting carbon dioxide emission rates (CERs) in elderly sleeping individuals. The results showed that the CERs in older adults were slightly lower than those in young adults and children. These findings provide important information for estimating ventilation rates in bedrooms.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Qiantao Zhao, Zhiwei Lian, Xinbo Xu
Summary: The current calculation methods of mean skin temperature did not perform well in some thermal comfort evaluations. In this study, a new calculation method for mean skin temperature was developed, taking into account factors such as receptor distribution, gender differences, ambient temperature, and local thermal stimulation. An experiment was conducted to test the new method, which showed higher accuracy in predicting thermal comfort compared to conventional methods, especially for females. This new calculation method provides an improved tool for thermal comfort assessment and has implications for future research.
INDOOR AND BUILT ENVIRONMENT
(2023)
Article
Biology
Xinbo Xu, Yuxin Yang, Ting Cao, Ting Nie, Zhiwei Lian
Summary: This research focused on the influence of skin temperature on thermal perception and found that both skin temperature and breath temperature had significant changes with ambient temperature and were significantly related to subjective thermal perception. The prediction accuracy of breath temperature for thermal perception was comparable to that of skin temperature.
JOURNAL OF THERMAL BIOLOGY
(2023)
Article
Thermodynamics
Ting Cao, Li Lan, Zhiwei Lian, Jingyun Shen
Summary: This article explores the effect of bedroom lighting on sleep and mood. It shows that suitable artificial lights (2700K) can provide relaxation and improve sleep quality. There is also a correlation between sleep quality and pre-sleep psychological states. The study emphasizes considering psychological states and sleep physiological responses when creating comfortable lighting conditions in bedrooms.
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT
(2023)
Review
Construction & Building Technology
Chao Guo, Li Lan, Yige Liu, Naiqing Meng, Cunming Li
Summary: This paper reviews 83 standards and studies on the conservation environment of collections worldwide, comparing the environmental parameters for preservation in different regions. The results show that the average temperature and humidity specified in the standards are 20 degrees Celsius and 45%, respectively, with variations for different material types. Additionally, the paper analyzes and compares the light intensity and pollutant concentrations in the collection's conservation environment.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Fanzhuo Zhou, Zhaojun Wang, Yuxin Yang, Chang Liu, Lin Duanmu, Yongchao Zhai, Zhiwei Lian, Bin Cao, Yufeng Zhang, Xiang Zhou, Jingchao Xie
Summary: Individual differences in thermal sensation are influenced by age, gender, and BMI. Among these factors, age has the greatest impact, followed by gender, and then BMI. The results showed that the neutral temperature increases with age, females have a higher neutral temperature compared to males, and an increase in BMI leads to an increase in neutral temperature.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Heng Du, Zisheng Zhao, Junmeng Lyu, Jinbo Li, Zhiqiang Liu, Xiangyang Li, Yuxin Yang, Li Lan, Zhiwei Lian
Summary: This paper investigates the impact of gender differences on thermal comfort under coupled environmental factors, with previous studies primarily focusing on air temperature alone. The experiment involved 27 subjects, 13 males and 14 females, experiencing various combinations of air temperature and air velocity. The findings reveal significant gender differences in colder environments with low air temperatures and elevated air velocity, while in hotter environments, males tend to feel more uncomfortable compared to females. The study emphasizes the need to consider gender differences when designing indoor thermal environments, especially in colder conditions.
ENERGY AND BUILDINGS
(2023)
Article
Environmental Sciences
Yuchen Hou, Bin Cao, Yingxin Zhu, Hui Zhang, Liu Yang, Lin Duanmu, Zhiwei Lian, Yufeng Zhang, Yongchao Zhai, Zhaojun Wang, Xiang Zhou, Jingchao Xie
Summary: This study investigated the relationship between outdoor temperature, indoor temperature, and thermal sensation from a global perspective. The influence of spatiotemporal heterogeneity on health studies was also explored. It was found that considering indoor temperature or individual thermal exposure is important in temperature-related health studies.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Engineering, Industrial
Yongxiang Shi, Jialin Wu, Li Lan, Zhiwei Lian
Summary: This paper quantitatively studied the interactions among operative temperature, relative humidity, and ventilation rate, and their effects on work performance. The results showed that there were antagonistic effects between operative temperature and relative humidity, between operative temperature and ventilation rate, and among the three factors on perception and expression tasks. However, there was a synergy effect between relative humidity and ventilation rate. For reasoning tasks, there was an antagonistic effect among the three factors and their combinations.
Article
Environmental Sciences
Xiaojun Fan, Chenxi Liao, Kazuya Matsuo, Kevin Verniers, Jelle Laverge, Brecht Neyrinck, Ivan Pollet, Lei Fang, Li Lan, Chandra Sekhar, Pawel Wargocki
Summary: A four-week-long field intervention experiment was conducted to investigate the effects of different ventilation rates on sleep quality and cognitive performance in bedrooms. The study found that lower ventilation rates resulted in significantly less deep sleep, more light sleep, and more awakenings. Additionally, a clear difference in deep sleep duration was observed between high and low ventilation rate conditions. However, no differences in cognitive performance were observed between the different ventilation conditions. These findings highlight the importance of proper ventilation control for optimal sleep quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Construction & Building Technology
Parth Bansal, Steven Jige Quan
Summary: This study investigates the relationship between urban form and canopy layer urban heat island (CUHI) using a relatively large sample of microclimate sensors in Seoul, Korea. The study compares different statistical models and finds that the spatially explicit gradient boosting decision tree (GBDT) model has the highest accuracy. The study also shows that the effect of urban form on CUHI varies at different time instances during the day. These findings provide valuable insights for planners to understand the complexity of urban climate and reduce CUHI magnitude.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Miaomiao Liu, Salah Almazmumi, Pinlu Cao, Carlos Jimenez-bescos, John Kaiser Calautit
Summary: Windcatchers provide effective low-energy ventilation and summer passive cooling in temperate climates. However, their use in winter is limited due to significant ventilation heat loss and potential discomfort. This study evaluates the applicability of windcatchers in low-temperature conditions, highlighting the need for control strategies to reduce over-ventilation and the integration of heat recovery or thermal storage to enhance winter thermal conditions.
BUILDING AND ENVIRONMENT
(2024)
Review
Construction & Building Technology
Behrouz Nourozi, Aneta Wierzbicka, Runming Yao, Sasan Sadrizadeh
Summary: This article presents a systematic review of ventilation solutions in hospital wards, aiming to enhance pathogen removal performance while maintaining patient and healthcare staff comfort using air-cleaning techniques. The study reveals the importance of proper ventilation systems in reducing infection risk and adverse effects of cross-contamination.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Zhen Yang, Weirong Zhang, Hongkai Liu, Weijia Zhang, Mingyuan Qin
Summary: The study examines the influence of personalized local heating on the thermal comfort of occupants in old residential buildings. The findings reveal that personalized local heating can increase the overall thermal sensation of occupants, but only a few methods are effective in enhancing thermal comfort. The chosen heating methods and background temperature affect the participants' selection of heating parts.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Hong Cheng, Dan Norback, Huilin Zhang, Liu Yang, Baizhan Li, Yinping Zhang, Zhuohui Zhao, Qihong Deng, Chen Huang, Xu Yang, Chan Lu, Hua Qian, Tingting Wang, Ling Zhang, Wei Yu, Juan Wang, Xin Zhang
Summary: The home environment and sick building syndrome (SBS) symptoms in five southern Chinese cities have been studied over time. The study found a decrease in asthma prevalence and an increase in allergic rhinitis. Cockroaches, rats, mice, mosquitoes or flies were identified as consistent biological risk factors for SBS symptoms, while redecoration, buying new furniture, and traffic air pollution were identified as other risk factors.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Chaojie Xing, Zhengtao Ai, Zhiwei Liu, Cheuk Ming Mak, Hai Ming Wong
Summary: This study experimentally investigated the emission characteristics of droplets around the mouth during dental treatments. The results showed that the peak mass fraction of droplets occurs within the size range of 20 μm to 100 μm, and droplets with a diameter less than 200 μm account for over 80% of the mass fraction. The dominant emission direction of droplets is towards the dummy's head and chest, forming an approximately cone shape.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Zhijian Liu, Zhe Han, Lina Hu, Chenxing Hu, Rui Rong
Summary: This study compared the effects of different respiratory behaviors on the distribution of aerosols in a ward and the risk of infection for healthcare workers using numerical simulation. It was found that talking in the ward significantly increased aerosol concentrations, particularly short periods of talking. Wards designed with side-supply ventilation had lower overall infection risk. Talking alternately between healthcare workers and patients slightly extended the impact time of aerosols.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yan Yan, Mengyuan Kang, Haodong Zhang, Zhiwei Lian, Xiaojun Fan, Chandra Sekhar, Pawel Wargocki, Li Lan
Summary: In a high-density city, opening windows for sleep may lead to increased indoor temperature, higher PM2.5 concentration, and noise disturbance, which can negatively impact sleep quality.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yan Bai, Liang Liu, Kai Liu, Shuai Yu, Yifan Shen, Di Sun
Summary: This study developed a non-intrusive personal thermal comfort model using machine learning techniques combined with infrared facial recognition. The results showed that the ensemble learning models perform better than traditional models, and the broad learning model has a higher prediction precision with lower computational complexity and faster training speed compared to deep neural networks. The findings provide a reference for optimizing building thermal environments.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Yue Lei, Zeynep Duygu Tekler, Sicheng Zhan, Clayton Miller, Adrian Chong
Summary: Mixed-mode ventilation is a promising solution for achieving energy-efficient and comfortable indoor environments. This study found that occupants can thermally adapt when switching between natural ventilation (NV) and air-conditioning (AC) modes within the same day, with the adaptation process stabilizing between 35 to 45 minutes after the mode switch. These findings are important for optimizing thermal comfort in mixed-mode controls, considering the dynamic nature of thermal adaptation.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Nan Mo, Jie Han, Yingde Yin, Yelin Zhang
Summary: This study develops a method based on the LCZ framework for a comprehensive evaluation of urban-scale heat island effects, considering the impact of geographic factors on LST. The results show that Guilin's geomorphological conditions lead to abnormal heat island effects during winter, and the cooling effects of mountains and water bodies vary seasonally in different built areas, with LCZ 2 exhibiting the strongest cooling effect.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Tunga Salthammer
Summary: Monitoring the potential formaldehyde emission of wood-based materials through test chamber investigations has significantly contributed to reducing indoor formaldehyde concentrations. However, the different methodologies used in these procedures prevent direct result comparison. Empirical models for converting formaldehyde steady-state concentrations based on temperature, humidity, air change rate, and loading were developed in the 1970s and have been modified to accommodate the development of lower-emitting materials. Formaldehyde emissions from wood-based materials are complex and require nonlinear regression tools for mathematical analysis.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Katarina Stebelova, Katarina Kovacova, Zuzana Dzirbikova, Peter Hanuliak, Tomas Bacigal, Peter Hartman, Andrea Vargova, Jozef Hraska
Summary: This study investigated the impact of reduced short-wavelength light on the hormone melatonin metabolite 6-sulfatoxymelatonin (u-sMEL) and examined the association between previous day's light exposure and u-sMEL. It was found that reducing short-wavelength light during the day did not change the concentration of u-sMEL. Personal photopic illuminance was positively correlated with u-sMEL in the reference week. The illuminance had a significant impact on u-sMEL, as shown by the evaluation of the mean of all three urine samples. However, this correlation was not found in the experimental week.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Ruoxin Xiong, Ying Shi, Haoming Jing, Wei Liang, Yorie Nakahira, Pingbo Tang
Summary: This study proposes a data-model integration method to identify and calibrate uncertainties in machine learning models, leading to improved thermal perception predictions. The method utilizes the Multidimensional Association Rule Mining algorithm to identify biased human responses and enhances prediction accuracy and reliability. The study also evaluates different calibration techniques and discovers their potential in enhancing prediction reliability.
BUILDING AND ENVIRONMENT
(2024)
Article
Construction & Building Technology
Beichao Hu, Zeda Yin, Abderrachid Hamrani, Arturo Leon, Dwayne McDaniel
Summary: This paper introduces an innovative super-resolution approach to model the air flow and temperature field in the cold aisle of a data center. The proposed method reconstructs a high-fidelity flow field by using a low-fidelity flow field, significantly reducing the computational time and enabling real-time prediction.
BUILDING AND ENVIRONMENT
(2024)
