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
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
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
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
Wonhee Cho, Juneyeong Heo, Myeong Hyeon Park, Hyeong Joon Seo, Kisup Lee, Dong Gyu Lee, Yongchan Kim
Summary: This study aims to provide a ventilation solution for energy-efficient buildings with high indoor moisture content during cooling seasons. An ERV-CC system was proposed to enhance dehumidification effectiveness, and field measurements showed that it improved indoor thermal comfort and energy efficiency compared to the conventional ERV system. The ERV-CC system demonstrated better dehumidification performance and optimum operating conditions were determined to achieve thermal comfort with minimum energy consumption.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Yan Hu, Zhengxuan Liu, Zhengtao Ai, Guoqiang Zhang
Summary: Ventilative cooling is an energy-saving technology that improves indoor air quality while reducing thermal discomfort and overheating risk in buildings. However, the lack of an optimal control strategy hinders its widespread application. This study developed a building model to evaluate the performance of ventilative cooling systems in different cities of China. The findings suggest that an adaptive thermal comfort model may not be optimal in terms of energy efficiency, and considering radiant temperature is important for accurate energy usage estimation. The study also highlights the importance of eliminating drawbacks in the control limits to effectively harness the energy-saving potential of ventilative cooling.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Yuxin Yang, Zisheng Zhao, Junmeng Lyu, Bo Wang, Jinbo Li, Shuguang Zhang, Zhiwei Lian
Summary: A new approach of using a dual-supply vent air conditioner with independent control of the air supply parameters at each vent has been proposed to meet diverse thermal comfort demands of different occupants. The feasibility of this method was tested in a living room environment, and numerical simulation was conducted to explore the differences in thermal environment at various locations under different air supply conditions.
JOURNAL OF BUILDING ENGINEERING
(2024)
Article
Thermodynamics
Kuan-Heng Yu, Yi-An Chen, Emanuel Jaimes, Wu-Chieh Wu, Kuo-Kai Liao, Jen-Chung Liao, Kuang-Chin Lu, Wen-Jenn Sheu, Chi-Chuan Wang
Summary: This study developed a control algorithm for optimizing the energy consumption of air-conditioning and exhaust fans through Deep Q-Learning in reinforcement learning. Results show that with agent control, optimization of indoor air quality, thermal comfort, and energy consumption efficiency can be achieved, achieving up to 43% energy savings.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Construction & Building Technology
Chao Qin, Shu-Zhen Zhang, Zheng-Tong Li, Chih-Yung Wen, Wei-Zhen Lu
Summary: A modified impinging jet ventilation system is proposed and numerically evaluated in a densely occupied classroom mockup. The results show that the system improves indoor air quality significantly, reduces infection probability, and decreases cooling coil load, although thermal comfort level and uniformity are slightly compromised.
BUILDING AND ENVIRONMENT
(2023)
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
Yingdi Yin, Wei Luo, Wenqiang Jing, Jin Zhang, Zeming Qin, Meng Zhen
Summary: This study selects six typical spaces of a university campus in Xi'an to investigate the comprehensive effect of heat and PM2.5 in open spaces. The results show that PM2.5 has a significant impact on thermal sensation and thermal comfort in the afternoon, and air quality comfort decreases with an increase in PM2.5 concentration at a constant physiological equivalent temperature. The findings provide experimental support for establishing a human thermal comfort research system under the interaction of multiple environments and a strategic basis for improving the urban outdoor thermal environment and air quality.
BUILDING AND ENVIRONMENT
(2022)
Article
Energy & Fuels
Maria Jesus Romero-Lara, Francisco Comino, Manuel Ruiz de Adana
Summary: The study evaluated the seasonal performance of three air-cooling systems in four different climate zones in the Mediterranean area, with results showing improvements in thermal comfort for DRIEC and DX by 29.8% and 14.6% in warm climatic conditions. However, DX showed significantly higher energy consumption compared to DRIEC, and RIEC provided the highest percentage of hours with favorable indoor air quality across all climate zones.
Article
Construction & Building Technology
Kraiwuth Kallawicha, Supichaya Boonvisut, H. Jasmine Chao, Tanachai Nitmetawong
Summary: This study investigated the relationship between sleep quality and bedroom characteristics among residents in urban Bangkok. Results showed that the presence of cockroaches and Aspergillus spp. was positively associated with poor sleep quality, while perceived cold indoor air temperature also contributed to poor sleep quality. Regular cleaning to reduce indoor allergens and maintaining a comfortable indoor air temperature are recommended to improve sleep quality among apartment residents in urban Bangkok.
BUILDING AND ENVIRONMENT
(2021)
Article
Engineering, Multidisciplinary
JiaZhen He, YeHu Lu, WenZhen Su, FangMing Wang, WenFang Song, LaiLi Wang, Min Wang
Summary: Maintaining thermal comfort in cold indoor environments is important, and using advanced clothing such as an air inflatable suit can effectively improve personal thermal management. The air-inflated suit not only increases clothing thermal insulation but also alleviates cold strain and provides higher skin and body temperatures. This technology can significantly reduce energy consumption and greenhouse gas emissions.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Thermodynamics
Xiangfei Kong, Lina Jiang, Ye Yuan, Xu Qiao
Summary: In this study, a hybrid phase change material was prepared by mixing microencapsulated phase change material and composite phase change material. Two types of gypsum-based PCM wallboards were then prepared and evaluated. The results showed that the hybrid wallboards exhibited good thermal performance and energy efficiency in different seasons. Overall, the hybrid wallboards are more suitable for practical application in building energy saving.
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
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
Biology
Tze-Huan Lei, Li Lan, Faming Wang
Summary: Thermal comfort in indoor environments is a physiological response regulated by skin and core temperatures. Proper experimental design and standardization are necessary when conducting thermal comfort experiments using indoor occupants. This article aims to provide guidelines for conducting such experiments during normal occupational activities and sleep in a home-based setting, in order to improve the experimental design and standardization. The key takeaway is that prior sample analysis and adherence to the guidelines outlined in this article are essential for studying thermal comfort related to indoor occupants.
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
Samiran Khorat, Debashish Das, Rupali Khatun, Sk Mohammad Aziz, Prashant Anand, Ansar Khan, Mattheos Santamouris, Dev Niyogi
Summary: Cool roofs can effectively mitigate heatwave-induced excess heat and enhance thermal comfort in urban areas. Implementing cool roofs can significantly improve urban meteorology and thermal comfort, reducing energy flux and heat stress.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Qi Li, Jiayu Chen, Xiaowei Luo
Summary: This study focuses on the vertical wind conditions as a main external factor that limits the energy assessment of high-rise buildings in urban areas. Traditional tools for energy assessment of buildings use a universal vertical wind profile estimation, without taking into account the unique wind speed in each direction induced by the various shapes and configurations of buildings in cities. To address this limitation, the study developed an omnidirectional urban vertical wind speed estimation method using direction-dependent building morphologies and machine learning algorithms.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Xiaojun Luo, Lamine Mahdjoubi
Summary: This paper presents an integrated blockchain and machine learning-based energy management framework for multiple forms of energy allocation and transmission among multiple domestic buildings. Machine learning is used to predict energy generation and consumption patterns, and the proposed framework establishes optimal and automated energy allocation through peer-to-peer energy transactions. The approach contributes to the reduction of greenhouse gas emissions and enhances environmental sustainability.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Ying Yu, Yuanwei Xiao, Jinshuai Chou, Xingyu Wang, Liu Yang
Summary: This study proposes a dual-layer optimization design method to maximize the energy sharing potential, enhance collaborative benefits, and reduce the storage capacity of building clusters. Case studies show that the proposed design significantly improves the performance of building clusters, reduces energy storage capacity, and shortens the payback period.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Felix Langner, Weimin Wang, Moritz Frahm, Veit Hagenmeyer
Summary: This paper compares two main approaches to consider uncertainties in model predictive control (MPC) for buildings: robust and stochastic MPC. The results show that compared to a deterministic MPC, the robust MPC increases the electricity cost while providing complete temperature constraint satisfaction, while the stochastic MPC slightly increases the electricity cost but fulfills the thermal comfort requirements.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Somil Yadav, Caroline Hachem-Vermette
Summary: This study proposes a mathematical model to evaluate the performance of a Double Skin Facade (DSF) system and its impact on indoor conditions. The model considers various design parameters and analyzes their effects on the system's electrical output and room temperature.
ENERGY AND BUILDINGS
(2024)
Article
Construction & Building Technology
Ruijun Chen, Holly Samuelson, Yukai Zou, Xianghan Zheng, Yifan Cao
Summary: This research introduces an innovative resilient design framework that optimizes building performance by considering a holistic life cycle perspective and accounting for climate projection uncertainties. The study finds that future climate scenarios significantly impact building life cycle performance, with wall U-value, windows U-value, and wall density being major factors. By using ensemble learning and optimization algorithms, predictions for carbon emissions, cost, and indoor discomfort hours can be made, and the best resilient design scheme can be selected. Applying this framework leads to significant improvements in building life cycle performance.
ENERGY AND BUILDINGS
(2024)
