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
Xiaoyu Tian, Junyu Yu, Weiwei Liu
Summary: This study investigates the application of facial skin temperature in evaluating thermal sensation. The experimental results show significant differences in skin temperature at different measurement points, with an increased uneven distribution as air temperature decreases. The study finds that nose skin temperature and the average skin temperature of the forehead, nose, and chin are the most suitable indicators of thermal sensation.
Article
Metallurgy & Metallurgical Engineering
Liu Chang, Wang Zhao-Jun, Su Xiao-wen, Yang Yu-xin, Zhou Fan-zhuo, Xu Run-pu
Summary: This study investigated the effects of perceived control on human thermal sensation and comfort in heated environments through a psychological experiment. The results revealed that the influence of perceived control on thermal sensation was related to individuals' thermal expectations. For those with strong expectations for a neutral environment, perceived control improved thermal sensation by meeting their expectations. However, for those with low thermal expectations, perceived control decreased their tolerance to the environment, ultimately leading to thermal discomfort.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Construction & Building Technology
Yijia Zhou, Maohui Luo, Hang Yu, Xiang Zhou
Summary: This study investigates the dynamic characteristics of thermal sensitivity in the arm and face. Results show that within the first 4 seconds of stimulation, the skin temperature change reaches 52% of the final variation. The arm and face show higher sensitivity to cooling stimuli compared to heating stimuli, with overshooting rates of 1.6 and 1.9 times for the arm, and 1.8 and 2.0 times for the face. Gender and body part significantly affect warm sensitivity, while cold sensitivity remains consistent across body parts.
INDOOR AND BUILT ENVIRONMENT
(2023)
Article
Construction & Building Technology
Yuxin Wu, Zixuan Zhang, Hong Liu, Baizhan Li, Risto Kosonen, Juha Jokisalo, Weining Wang
Summary: Understanding thermal comfort in dynamic environments is crucial for developing air temperature control strategies. This study investigated the effects of air temperature change rates and directions on thermal perceptions and physiological responses. The results showed that temperature change direction had an impact on thermal sensation, with decreasing temperatures leading to lower thermal sensation votes. The study also proposed preliminary thermal comfort models suitable for hot summer climates.
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
Changyong Yu, Baizhan Li, Yuxin Wu, Baofan Chen, Risto Kosonen, Simo Kilpelainen, Hong Liu
Summary: This study compares the performance of individual thermal comfort prediction models using professional and practical data settings with different machine learning algorithms. Results show higher accuracy with professional data and the Cosine KNN and ensemble of Subspace KNN are identified as the best ML algorithms for professional and practical settings, respectively.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Yeyu Wu, Bin Cao
Summary: This study focuses on identifying individual thermal comfort requirements using infrared images and proposes prediction models based on machine learning algorithms. The results show that the machine learning models based on local skin temperature have similar prediction accuracy to traditional models and have significant feasibility for practical application.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Xiaomeng Si, Jiuhong Zhang, Mingxiao Ma
Summary: This study explored the response patterns of human physiological parameters to sudden temperature changes in a shopping mall. The results showed that when the indoor temperature did not exceed 24 degrees Celsius and the temperature difference between hot and cold environments was greater than 30 degrees Celsius, it took an average of 12-18 minutes for the body to reach a new physiological equilibrium. Children required less time to return to a steady state compared to other age groups, and middle-aged adults preferred a slightly warmer indoor temperature.
Article
Construction & Building Technology
Ruhang Zhang, Jianhua Liu, Liang Zhang, Jindi Lin, Qingqing Wu
Summary: The experiment explores the effects of wearing medical surgical masks on human thermal sensation, thermal comfort, and breathing comfort in office buildings in summer. Results show that wearing masks significantly impacts subjective thermal sensation, comfort, and breathing, with high-temperature and high-humidity microclimates causing poor tolerance and discomfort. As environmental temperature rises, the impact of wearing masks becomes more significant.
Article
Construction & Building Technology
Shan Zhou, Baizhan Li, Chenqiu Du, Runming Yao, Linyuan Ouyang, Haixia Zhou, Risto Kosonen, Arsen Krikor Melikov, Liangyue Shang, Hong Liu
Summary: This study investigates the impact of daily temperature changes on the thermal responses of the elderly and establishes thermal prediction models specifically for them. The findings suggest that temperature changes and neutral thermal experiences significantly influence the thermal responses of the elderly, and they exhibit different responses compared to young people.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Xinbo Xu, Zhiwei Lian
Summary: The application of skin temperature in assessing thermal sensation has been important but limited. Individual differences in gender, age, and region are not properly represented by a single skin temperature, as core temperature and thermal sensitivity should be considered. In scenarios with dynamic core temperature, a single skin temperature is not suitable for comparing thermal sensation within or between groups. In this paper, a comprehensive thermal sensation evaluation index is proposed based on the latest thermo-physiology perspective.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Yuxin Wu, Hong Liu, Baizhan Li, Risto Kosonen, Shen Wei, Juha Jokisalo, Yong Cheng
Summary: The study found that considering thermal history is crucial for the accuracy of individual thermal comfort models. Results show that incorporating historical air temperature as an input parameter can significantly improve the prediction accuracy of thermal comfort and thermal demand.
BUILDING SIMULATION
(2021)
Article
Construction & Building Technology
Shuai Zhang, Neng Zhu
Summary: Current studies show that stable indoor thermal environments don't guarantee the thermal comfort of residents, and unreasonable temperature settings can lead to discomfort and high energy consumption. Temperature ramps in indoor environments can affect human thermal responses. Female participants are more sensitive to humidity perception during temperature ramps, while a 2 degrees C temperature ramp-up doesn't significantly impact the thermal comfort of participants. Male participants are more receptive to ambient temperatures, while female participants are more sensitive to cool environments. Good fitting relationships between thermal sensation and thermal comfort, as well as thermal sensation and facial thermal sensation, were observed.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Abdelkader Bassoud, Hamid Khelafi, Abderahmane Mejedoub Mokhtari, Abdelmalek Bada
Summary: The study used the ASHRAE-55 adaptive model to evaluate thermal comfort and climatic adaptation in old buildings made of adobe in a hot and arid region. The results showed that these buildings offer better thermal comfort compared to modern concrete buildings during extreme heat, due to their high thermal insulation properties.
BUILDING AND ENVIRONMENT
(2021)
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)