Article
Energy & Fuels
Pradeep Shakya, Gimson Ng, Xiaoli Zhou, Yew Wah Wong, Swapnil Dubey, Shunzhi Qian
Summary: The study examined a hybrid cooling system that combines natural ventilation with radiant cooling, overcoming condensation issues on the chilled ceiling. It was found that thermal comfort was only acceptable in limited outdoor conditions. Comparison of energy consumption showed that the hybrid system significantly saved primary energy compared to traditional cooling systems.
Article
Thermodynamics
Palanisamy Dhamodharan, Bakthavatsalam Kannappan Ayalur, J. Judefelix, Rajendran Prabakaran, Sung Chul Kim
Summary: The applicability of recovered air-conditioning condensate in a Ceiling Mounted Radiant Cooling Unit (CMRCU) for achieving thermal comfort in a cabin has been studied. The study includes field assessment, exergy analysis, simulation, and experiments. The results show that using the recovered condensate can enhance the system performance and achieve thermal comfort in the cabin. Additionally, a thermal energy storage system can prolong the thermal comfort period. Energy and economic analysis demonstrate that effective use of the condensate can save energy and fulfill the requirements for green building certification.
APPLIED THERMAL ENGINEERING
(2024)
Article
Construction & Building Technology
Zhihao Ma, Dongliang Zhao, Faming Wang, Ronggui Yang
Summary: Personal thermal management techniques have great potential for improving thermal comfort and energy saving. Researchers have investigated novel radiative cooling/heating textiles, but there is a lack of effective evaluation methods for their thermal performance. This study aims to build a comprehensive model to evaluate the thermal comfort and energy saving effectiveness of novel textiles, considering factors like air gap thickness.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Yuying Liang, Nan Zhang, Huijun Wu, Xinhua Xu, Ke Du, Jianming Yang, Qin Sun, Kaijun Dong, Gongsheng Huang
Summary: The study shows that the thermal environment and thermal comfort created by the DRCU under low radiant cooling temperatures meet the comfort criteria of the ASHRAE Standard.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Marie Rugholm Krusaa, Ida Orduk Hoffmann, Christian Anker Hviid
Summary: This paper experimentally investigates the cooling performance of a concept where a radiant ceiling is suspended from a hollow-core concrete slab and ventilation air is distributed without ducts and air terminals. The results show that the concept performs well in terms of thermal comfort and draught, and offers streamlined installation procedures.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Nagham Ismail, Djamel Ouahrani
Summary: The personalized cooling radiant cubicle (PCRC) combined with a conventional HVAC system can maintain a comfortable microclimate in office rooms in hot climates, reduce thermal asymmetry, improve predicted dissatisfaction index, and save energy with a payback period between 6 and 7 years.
Article
Construction & Building Technology
Bin Yang, Yuyao Guo, Shuaixing Xu, Wei Su, Mengchun Wu, Faming Wang
Summary: This study investigated the influence of different porous ceiling opening rates on the flow field distribution and human thermal comfort in a radiant heating room through numerical simulations and subjective experiments. The results showed that non-uniform opening on the porous ceiling can optimize the thermal environment and reduce airflow discomfort, while adjusting the ceiling opening rates can maintain the neutral level in the room.
BUILDING AND ENVIRONMENT
(2022)
Article
Thermodynamics
Reza Mokhtari, Roghayeh Ghasempour
Summary: The emergence of daytime radiative cooling as a promising cooling technology has attracted scientists to investigate its performance in different applications. This paper proposes an active radiative cooling system for a single-family house in Isfahan city, Iran, which utilizes a hydroponic cooling system inside the house. The feasibility study shows that the rooftop panels can provide up to 96 W/m2 cooling and a total of 6 kW cooling. The system can provide thermal comfort for the occupants in 99% of the hours in summer.
APPLIED THERMAL ENGINEERING
(2023)
Review
Construction & Building Technology
K. Dharmasastha, Ziwen Zhong, Jianlei Niu, Haobin Liang
Summary: Radiant cooling systems assisted by cover-shields have the potential to save energy and improve thermal comfort. By using infrared-transparent membranes or aerogels, condensation on the cooling surface can be avoided. This study reviews the system configurations, use of cover materials, heat transfer modeling, cooling capacity ranges, and thermal comfort performance of cover-shield-assisted radiant cooling systems.
ENERGY AND BUILDINGS
(2023)
Article
Thermodynamics
K. Dharmasastha, D. G. Leo Samuel, S. M. Shiva Nagendra, M. P. Maiya
Summary: A holistic energy conservation approach is needed to reduce the energy consumption of buildings. The innovative TAGFRG system integrates the energy-efficient TABS with eco-friendly GFRG, reducing both operational and embodied energies.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Michal Krajcik, Martin Simko, Ondrej Sikula, Daniel Szabo, Dusan Petras
Summary: The radiant wall heating and cooling system, tested with pipes attached to thermally insulating bricks, is suitable for building retrofit and new buildings due to its affordability and ease of installation. It provides fast thermal response and low thermal losses, benefiting energy efficiency. Installation on multiple walls can lead to a more uniform thermal environment compared to installing on a single wall.
ENERGY AND BUILDINGS
(2021)
Article
Construction & Building Technology
Henrikki Pieska, Adnan Ploskic, Qian Wang
Summary: As sustainable development becomes more significant in policy-making, quantifying the sustainability of a project is increasingly important. This study conducted a life-cycle assessment (LCA) of a radiant cooling system for a retrofit project, comparing it with a conventional alternative. The results showed that the radiant system had a lower environmental impact in all impact categories, but the conventional system was more sensitive to decarbonization of electricity production.
BUILDING AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Helene Teufl, Matthias Schuss, Ardeshir Mahdavi
Summary: This article discusses the consequences of global warming and urban heat islands on cooling-related energy use and environmental emissions. It introduces an alternative user-centric radiant cooling solution aimed at addressing the limitations of conventional radiant cooling systems by positioning panels closer to occupants and incorporating drainage systems for potential condensation. A preliminary laboratory study showed both the potential and limitations of this user-centric approach.
ENERGY AND BUILDINGS
(2021)
Article
Energy & Fuels
Henrikki Pieska, Adnan Ploskic, Sture Holmberg, Qian Wang
Summary: Global climate change has increased the demand for space cooling, and radiant cooling systems provide improved thermal comfort but may have reduced energy efficiency due to dehumidification. A study comparing the performances of radiant cooling systems with and without dehumidification was conducted, showing that the system with dehumidification produces better thermal comfort conditions at the cost of higher energy and exergy consumption.
Article
Construction & Building Technology
Eun Sub Kim, Seok Hwan Yun, Dong Kun Lee, Na Youn Kim, Zheng Gang Piao, Sang Hyuck Kim, Seunghwan Park
Summary: The energy flux of Vertical Greening System (VGS) is crucial for optimizing cooling performance and mitigating heat stress in outdoor thermal comfort. Analysis shows that VGS can significantly reduce net radiation and Mean Radiant Temperature (MRT), and the cooling efficiency of transpiration in VGS is 7.38 times more effective than evaporation from soil without plants.
DEVELOPMENTS IN THE BUILT 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)