Article
Construction & Building Technology
Mingwu Tang, Xiaozhou Wu, Jianyi Xu, Jiying Liu, Zhengwei Li, Jie Gao, Zhen Tian
Summary: This paper investigates the effect of control methods on temperature fluctuations and energy consumption in the radiant ceiling cooling system. The results show that the deep reinforcement learning (DRL) control method outperforms traditional control methods in reducing temperature fluctuations and saving energy.
Article
Construction & Building Technology
Pei Peng, Chen Zhang, Wenqiang Li, Michal Pomianowski, Guangcai Gong, Xi Fang, Liang Chun, Rui Guo
Summary: This study systematically investigates the application of diffuse ceiling ventilation (DCV) in indoor airflow and contaminant dispersion for space heating and cooling. The results show that DCV provides a satisfying thermal environment in both heating and cooling modes, and there is no reverse flow from the room to the plenum. The study also reveals that DCV performs better for space cooling and the exhaust positions have a greater influence on the system than the air change rates.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Xing Daoming, Li Nianping
Summary: In this study, a numerical program was developed to quickly and inexpensively determine the mean radiant temperature (MRT) of indoor environments controlled by radiant cooling systems. The program was validated against experimental results and data from previous studies. Radiant temperature fields of different shaped surfaces were predicted, and the thermal comfort level was preliminarily evaluated.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Construction & Building Technology
Wufeng Jin, Yi Wang, Cheng Wang, Lizhi Jia, Deokkyu Moon, Sungwoo Song
Summary: This study develops a novel cooling capacity prediction model for open-type cooling radiant ceiling panel systems (O-CRCP) considering the impact of panel size, layout, and installation position. Experimental results show that the heat flux of O-CRCP is significantly higher compared to closed-type systems (C-CRCP). A detailed analysis reveals that natural convective heat transfer is the main factor enhancing cooling capacity. A new prediction model using multi-regression method is developed and evaluated, showing good agreement with measured values and acceptable for engineering applications. The model provides support and guidance for selecting and arranging O-CRCP in real applications.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Ji-Su Choi, Gun-Joo Jung, Kyu-Nam Rhee
Summary: Ceiling radiant cooling panel (CRCP) systems have been widely used for space cooling due to their high thermal comfort and energy efficiency. However, the cooling capacity of CRCP systems can be limited due to the need to maintain the panel surface temperature above the dew-point temperature. In this study, a fan-assisted ceiling radiant cooling panel (FCRCP) system was developed using small and low-cost fans to enhance the cooling capacity without major modifications to the existing architectural or mechanical elements. Experimental and numerical analysis results showed that the FCRCP system can significantly improve the cooling performance compared to conventional CRCP systems.
ENERGY AND BUILDINGS
(2023)
Article
Construction & Building Technology
Xingguo Guo, Shuangshuang Wan, Wenhua Chen, Hui Zhang, Edward Arens, Yuanda Cheng, Wilmer Pasut
Summary: This study evaluates the heat transfer from radiant ceilings with suspended acoustical panels and investigates the impact of an upward-directed ceiling fan on heat exchange. The simulation results show that increasing the fan speed enhances convective and total heat transfer for the radiant panel. Additionally, increasing the fan speed and decreasing the coverage ratio of acoustical panels can reduce temperature nonuniformity and improve thermal comfort in the occupied part of the room. The study suggests that using an upward-directed ceiling fan is a valuable approach to increase radiant surface temperatures, save cooling energy, and reduce surface condensation risk.
ENERGY AND BUILDINGS
(2023)
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
Construction & Building Technology
Ali Radwan, Takao Katsura, Lan Ding, Ahmed A. Serageldin, Ahmed EL-Seesy, Katsunori Nagano
Summary: This article presents a new type of CRCP based on multi-segmented mini-channels, which achieves higher cooling capacity and lower power consumption compared to the traditional flat sheet-and-tube panels. By inclining and increasing the area, the new design significantly enhances the cooling capacity at the same indoor temperature.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Wei Liao, Jinqing Peng, Yimo Luo, Yingdong He, Nianping Li, A. Yongga
Summary: Comparative experimental studies were conducted on convective air-conditioning and radiant ceiling terminals to examine their differences in energy consumption and thermal comfort. The results showed that the radiant ceiling terminal outperformed the convective air-conditioning terminal in terms of energy savings and indoor thermal comfort.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Baisong Ning, Youming Chen
Summary: Traditional cooling load calculation theories and methods based on convection heat transfer were found to be insufficient for systems that use both radiation and convection to remove room heat gains. A new radiant and convective time series method was proposed, which showed good accuracy in simulations and verification, suitable for calculating cooling loads of various systems.
BUILDING AND ENVIRONMENT
(2021)
Article
Thermodynamics
Aminhossein Jahanbin, Giovanni Semprini
Summary: The present study investigates the integrated effects of ceiling radiant cooling and ventilation on the dispersion and deposition of indoor airborne particles. A CFD model is developed and validated to predict airflow characteristics, thermal performance, and particle trajectories. Results show that the particle decay rate is influenced by the temperature difference between the surface of the cooling panel and surrounding walls, and the surface temperature of the panel is a more effective parameter than the inlet air velocity in particle deposition rate.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Construction & Building Technology
Qiong Chen, Nan Li
Summary: The research developed a physics-based model for radiant ceiling cooling systems and applied model predictive control to improve zone air temperature control, achieving better thermal comfort and energy efficiency. By simplifying the system model and utilizing advanced control strategies, the proposed approach demonstrated significant potential for enhanced performance compared to traditional control methods.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Wei Liao, Caifeng Wen, Yimo Luo, Jinqing Peng, Nianping Li
Summary: In this study, the energy consumption and indoor thermal environment of a radiant ceiling heating and cooling system with different transparent building envelopes were investigated. The results show that the type of transparent envelope affects the energy saving rate and thermal environment distribution.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Xiaozhou Wu, Hao Gao, Mingming Zhao, Jie Gao, Zhen Tian, Xiangli Li
Summary: This study experimentally investigated the indoor air distribution and thermal environment in a ceiling cooling room. The results showed that the type of ventilation system significantly affected the indoor air distribution and thermal environment in the ceiling cooling room.
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)
Editorial Material
Construction & Building Technology
Chunwen Xu, Xilian Luo, Chuck Yu, Shi-Jie Cao
INDOOR AND BUILT ENVIRONMENT
(2020)
Editorial Material
Construction & Building Technology
Junyan Yang, Yi Shi, Chuck Yu, Shi-Jie Cao
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Construction & Building Technology
Dong Xie, Chenhua Wang, Chuck W. Yu, Hanqing Wang
Summary: The study found that increasing the air supply speed of the purifier is an effective solution to reduce indoor radon pollution, especially when the purifier is placed in the middle of the room. Under mechanical ventilation conditions, the purification function is more effective when the air supply angle is 60 degrees.
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Joost van Hoof, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Construction & Building Technology
Dong Xie, Chenhua Wang, Chuck Wah Yu, Yun Wang, Hanqing Wang
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Multidisciplinary Sciences
Liyuan Zhang, Junwei Su, Yu Huang, Qiyuan Wang, Renjian Zhang, Yunfei Wu, Yue Zhang, Yan Cheng, Yuanping He, Shuncheng Lee, Chuck Yu, Zhaolin Gu
SCIENTIFIC REPORTS
(2020)
Article
Construction & Building Technology
Li Bai, Chunhui Li, Chuck Wah Yu, Zijian He
Summary: In recent years, air pollution in Northeastern China, specifically in Jilin Province, has been increasing due to coal burning and automobile emissions. By analyzing the data using ArcGIS, PCA, and non-carcinogenic risk models, it was found that pollutants have a temporal distribution trend of winter > spring > autumn > summer, with a spatial distribution decreasing from northwest to southeast. The main sources of air pollution were identified as coal-fired and automobile emissions.
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Xilian Luo, Yuexi Dang, Chuck Wah Yu, Zhaolin Gu
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Jianguo Wang, Shi-Jie Cao, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Qiang Ye, Shunyi Wang, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2021)
Review
Construction & Building Technology
Chengjun Li, Hanqing Wang, Chuck Wah Yu, Dong Xie
Summary: The study found that the main acting forces for submicron aerosol particles include drag force, Brownian force, Saffman lift force, and thermophoresis force. Brownian force cannot be ignored when the particle diameter is below 0.3 µm, promoting irregular particle movement and enhancing diffusion ability. Smaller particle sizes, higher heat source temperatures, and lower initial particle velocities all lead to increased horizontal dispersity (D-H).
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Chenhua Wang, Dong Xie, Xiaomin Yang, Hanqing Wang, Chuck Wah Yu
Summary: The study found that temperature difference and water content in concrete have significant effects on Rn-222 exhalation rate, with varying rates observed under different conditions.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Construction & Building Technology
Dong Xie, Yangxi Wu, Chenhua Wang, Chuck Wah Yu, Ling Tian, Hanqing Wang
Summary: This study investigated the indoor radon diffusion from building materials and found that ventilation strategies can effectively reduce indoor radon concentration and stabilize radon distribution, consequently minimizing occupants' exposure to high radioactive levels of radon in urban environments.
SUSTAINABLE CITIES AND SOCIETY
(2021)
Article
Construction & Building Technology
Chenhua Wang, Dong Xie, Chuck Wah Yu, Hanqing Wang
Summary: The study conducted an experimental evaluation on radon exhalation from concrete blocks, finding that an increase in sand content led to higher radon exhalation rate, while an increase in thickness and water content reduced the rate. Additionally, indoor radon concentration and effective dose were evaluated for concrete blocks with cover layers, showing that adding a cover layer could reduce both indoor radon concentration and the radon dose on exposure to occupants.
INDOOR AND BUILT ENVIRONMENT
(2021)