Article
Environmental Sciences
Prashant Kumar, Nidhi Rawat, Arvind Tiwari
Summary: A naturally-ventilated operational classroom was monitored to assess the spatial variations of classroom air pollution, thermal comfort, and ventilation indicators under different scenarios. The study found that CO2 and PM10 concentrations varied over time rather than space. Two air purifiers were most effective when placed in the most polluted area of the classroom. This study provides high-resolution data for validating detailed numerical models and informing decision-making to reduce children's exposure to air pollution and re-breathed CO2.
ENVIRONMENTAL RESEARCH
(2023)
Article
Construction & Building Technology
Chia-Ren Chu, Kai-Jie Yang
Summary: This study found that natural ventilation in buildings can effectively remove indoor particulate contaminants, while also potentially introducing outdoor pollutants that affect indoor air quality. Deposition rates are higher in long buildings compared to short buildings, due to sluggish airflow inside the long buildings.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Zhiqiang Zhou, Ran Jiao, Liang Dong
Summary: Perceived control has a significant impact on outdoor thermal comfort, expanding the range of acceptable thermal environment and reducing thermal sensitivity.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Kuniaki Mihara, Chandra Sekhar, Yuichi Takemasa, Bertrand Lasternas, Kwok Wai Tham
Summary: In an actual university building, a design studio equipped with DOAS-CF provided better thermal comfort and air quality compared to the computer lab with FCU, with a 27.7% energy consumption saving due to higher setpoint temperature and occupants' behavioral adaptation.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Antonio J. Aguilar, Maria L. de la Hoz-Torres, Maria Dolores Martinez-Aires, Diego P. Ruiz
Summary: This study assessed the impact of natural ventilation efficiency and university students' thermal perception during the cold season. The results showed that while the CO2 concentration was within the recommended range in most classrooms, only a small percentage of classrooms had thermal conditions that met the national regulations for comfort. These thermal conditions affected students' satisfaction and academic performance.
Article
Metallurgy & Metallurgical Engineering
Mou Di, Cao Bin, Zhu Ying-xin
Summary: Kunming has a unique climate and most residential buildings are naturally ventilated. Despite the indoor temperature being lower than the comfort range, most residents still feel neutral and comfortable. The neutral temperature in Kunming is determined to be 16.96 degrees C, with an acceptable thermal sensation vote (TSV) range of -0.72 to 1.52.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Environmental Sciences
Xiwen Feng, Zhimin Zheng, Yanping Yang, Zhaosong Fang
Summary: The study found that people have varying sensitivities to different thermal parameters in different seasons, with air temperature being the most sensitive parameter and relative humidity having little effect on thermal sensitivity. SET* showed the best consistent thermal sensitivity among the people in Guangzhou, compared to PET and UTCI. The research results can provide a reference for urban planning.
Article
Construction & Building Technology
Kevin Ka-Lun Lau, Chun Yin Choi
Summary: The study examined the impact of perceived aesthetics and acoustics on outdoor thermal comfort in Hong Kong during hot summers. It found that perceived environmental quality plays a significant role in thermal comfort, with groups having higher satisfaction in perceived acoustics and aesthetics showing higher comfort levels.
BUILDING AND ENVIRONMENT
(2021)
Article
Environmental Sciences
Ahmad Hassan, Muhammad Zeeshan, Muhammad Faraz Bhatti
Summary: The study found a difference in indoor and outdoor microbial air quality in public university libraries, with bacteria and fungi mainly originating from indoor activities and outdoor environments respectively. The indoor/outdoor ratio was less than 1 for fungi and higher than 1 for bacteria.
ATMOSPHERIC POLLUTION RESEARCH
(2021)
Article
Construction & Building Technology
Olivier Dartevelle, Geoffrey van Moeseke, Erwin Mlecnik, Sergio Altomonte
Summary: This study evaluates the summer thermal comfort of 23 nZEB houses in Wallonia and finds that despite the temperate climate, summer thermal discomfort is frequent. The results emphasize the importance of better integrating environmental controls even in temperate climates to mitigate overheating risks in nZEB houses.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Kyohei Kondo, Takashi Asawa
Summary: This study examined the effects of air temperature and wind speed on sleep quality in naturally ventilated rooms during autumn. The results showed that a nocturnal mean temperature of 23-24 degrees C was associated with the lowest percentage of wake after sleep onset (WASO), regardless of the window opening conditions. Subjective sleep satisfaction and WASO did not show significant differences between the conditions.
Article
Construction & Building Technology
Chali Yadeta, Madhavi Indraganti, Gudina Terefe Tucho, Esayas Alemayehu
Summary: This study investigates thermal comfort, adaptive models, and behavioral adaptations in naturally ventilated residential buildings in Jimma town, Ethiopia. The research finds that a majority of occupants feel uncomfortable with the environmental temperature but are able to adapt through environmental adjustments, clothing choices, and activity levels.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Hardi K. Abdullah, Halil Z. Alibaba
Summary: This study proposes a performance-based window design model for optimised natural ventilation potential by reducing indoor CO2 concentration and improving thermal comfort. The model includes stages such as knowledge acquisition, establishing relationships, determining performance criteria, conducting experiments, evaluating findings, and making decisions.
Article
Construction & Building Technology
Weixin Zhao, Sami Lestinen, Panu Mustakallio, Simo Kilpelainen, Juha Jokisalo, Risto Kosonen
Summary: The objective of the study was to compare the performance of four typical air distribution methods in both heating and cooling modes in a mock-up classroom. The study found that the displacement ventilation concept and ceiling diffuser were suitable solutions for classroom environments.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Weixin Zhao, Panu Mustakallio, Sami Lestinen, Simo Kilpelainen, Juha Jokisalo, Risto Kosonen
Summary: The challenge of air distribution in classrooms is to ensure ventilation performance under different usage conditions. This study compares the indoor climate in summer and winter conditions with different occupancy densities using different air suppliers. The results show that displacement ventilation performs the best in the occupied zone and achieves a higher air change efficiency compared to other air diffusers. Ceiling diffusers also provide a reasonably low air velocity and uniform indoor climate.
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)