Article
Thermodynamics
Ayman Alazazmeh, Muhammad Asif
Summary: Climate change is a major challenge for mankind, with efforts to reduce greenhouse gas emissions. The building sector, responsible for a significant amount of energy consumption and emissions, especially HVAC systems, plays a crucial role. Retrofitting commercial buildings can significantly improve energy performance and indoor air quality, with potential cost savings.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Review
Construction & Building Technology
Soheil Roumi, Fan Zhang, Rodney A. Stewart, Mattheos Santamouris
Summary: This paper provides a comprehensive review of 25 studies on the development of IEQ evaluation models in commercial buildings. The studies differentiate between objective and subjective measurement approaches, as well as three types of IEQ models. The analysis discusses five commonly used methods and evaluates the interaction effects and relative contributions of IEQ factors. The paper proposes five key criteria for developing quality IEQ models and presents a ranking and scoring system for their evaluation.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Lin-Rui Jia, Jie Han, Xi Chen, Qing-Yun Li, Chi-Chung Lee, Yat-Hei Fung
Summary: The study suggests that the thermal comfort prediction model should consider factors such as genders, ages, and socioeconomic backgrounds, and that mixed-mode ventilation combining natural and mechanical approaches is preferred for its lower energy consumption and improved thermal comfort. Optimization of passive design parameters of buildings can significantly reduce ventilation demands while maintaining indoor thermal comfort.
Article
Engineering, Multidisciplinary
Amr Sayed Hassan Abdallah, Ahmed Makram, Mohamed Abdel-Azim Nayel
Summary: The study analyzed the electrical energy consumption and indoor environment of the terminal building at Assiut International Airport in Egypt. It was found that the HVAC system accounted for 70% of the overall building electricity demand, with an Energy Use Intensity (EUI) of 300 kWh/m(2)/year. By adjusting the HVAC set temperature, a significant reduction of 24.5% in total energy consumption during hot months was achieved.
AIN SHAMS ENGINEERING JOURNAL
(2021)
Article
Construction & Building Technology
Raul Berto, Francesca Tintinaglia, Paolo Rosato
Summary: The study highlights the importance of indoor comfort on people's quality of life and values. It reveals that thermal comfort is the aspect that people are willing to pay the highest price for, indicating a high level of appreciation for indoor comfort.
BUILDING AND ENVIRONMENT
(2023)
Review
Construction & Building Technology
Ahmet Yuksel, Muslum Arici, Michal Krajcik, Mihriban Civan, Hasan Karabay
Summary: This review highlights the interrelationship between thermal comfort, indoor air quality, and energy consumption in holy temples, revealing the need for more comprehensive studies in order to improve the indoor environment and reduce energy costs.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Graham Coulby, Adrian K. Clear, Oliver Jones, Suzanne McDonald, Alan Godfrey
Summary: This study aims to monitor the impact of long-term changes in individuals and their environment on indoor environmental quality, and proposes a new approach to environmental perception gathering. The protocol has the potential to reveal the correlation between environmental changes and individual behavioral and physiological responses, which is significant for building performance monitoring and individual health and well-being.
Article
Construction & Building Technology
Joao Gabriel Carrico de Lima Montenegro Duarte, Bruno Ramos Zemero, Ana Carolina Dias Barreto de Souza, Maria Emilia de Lima Tostes, Ubiratan Holanda Bezerra
Summary: This study aimed to improve energy efficiency in buildings through the use of BIM technology. A case study was conducted on two classrooms in an educational building in the Amazon region, evaluating and implementing energy-saving strategies to enhance the overall energy performance of the building.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Ahmet Yuksel, Muslum Arici, Michal Krajcik, Mihriban Civan, Hasan Karabay
Summary: This study investigated the impact of pandemic restrictions on energy consumption, thermal comfort, and indoor air quality in mosques in Turkey. The results showed that lighting energy consumption decreased due to less usage during the pandemic, while heating and cooling costs increased in one mosque despite restricted usage. Keeping windows open and limiting occupancy improved indoor air quality, evidenced by lower CO2 concentration during the pandemic. The study also found that acceptable thermal comfort was achieved at night during the summer period under pandemic measures.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Construction & Building Technology
Ghogare Abhijeet Ganesh, Shobha Lata Sinha, Tikendra Nath Verma, Satish Kumar Dewangan
Summary: This article reviews the literature on Indoor Environment Quality (IEQ) with a focus on thermal comfort, discussing various factors affecting thermal comfort and the complexity of the relationship between comfort parameters, occupant well-being, and IEQ. Efforts have been made to simplify this complex relationship for designers, engineers, and researchers in the field.
BUILDING AND ENVIRONMENT
(2021)
Article
Energy & Fuels
Marek Borowski, Klaudia Zwolinska, Marcin Czerwinski
Summary: Ensuring the comfort and health of occupants is crucial for building systems, especially in hotels where indoor environmental quality directly affects guest satisfaction and financial benefits. This study analyzed the indoor conditions in guest rooms of a hotel in Poland, including temperature, humidity, and CO2 concentrations. The results showed satisfactory temperature and humidity levels most of the time, but two rooms had temporary high CO2 concentrations, suggesting the need for increased ventilation. The dynamic variations in measured parameters were influenced by individual preferences and user behaviors, making detailed analysis challenging.
Article
Thermodynamics
Luis Adrian Lopez-Perez, Jose Jasson Flores-Prieto
Summary: This study presents a comparative analysis of energy savings in an air-conditioning educational building in Aw's tropical climate using different thermal comfort modeling approaches. The results show that the artificial neural network-based model (ANN-BM) is significantly more accurate and efficient in predicting comfort temperature and achieving energy savings compared to other models.
Article
Construction & Building Technology
Xi Meng, Lianyu Yan, Fudan Liu
Summary: Combining a living wall with air-conditioning can improve the indoor thermal environment, reduce CO2 concentration, and enhance subjective evaluation on indoor environment.
BUILDING AND ENVIRONMENT
(2022)
Article
Energy & Fuels
Salah Alghamdi, Waiching Tang, Sittimont Kanjanabootra, Dariusz Alterman
Summary: In this study, the optimization of architectural building design parameters for a single-story educational building in a warm temperate climate was demonstrated. The validated model achieved significant reductions in energy consumption and thermal discomfort hours compared to the baseline simulation model.
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
Thermodynamics
Zhiqiang Guo, XiaoFeng Guo, Qian Yang, Wei Dong
Summary: The study conducted numerical investigations on the flow and heat transfer characteristics of unexpanded jet impingement in piccolo hot air anti-icing chambers of aircraft. It was found that under a small dimensionless impinging distance, the impinging air cannot be fully expanded, resulting in ineffective heating of the surface. Additionally, ambient temperature was identified as a significant factor influencing jet impinging heat transfer.
APPLIED THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Francesca Contrada, Francesco Causone, Yacine Allab, Andrea Kindinis
Summary: The COVID-19 crisis has shown the importance of air exchange efficiency in virus transmission. While standardized procedures for mechanical ventilation have limitations, a new approach has been developed for natural and mixed-mode ventilation strategies. Results indicate that this new procedure is robust and feasible for implementation.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Hong Wei, Xiaofeng Guo, Zhida Li, Xuesen Yang, Zhongfu Tang, Chao Fu, Wei Dong
Summary: The pre-cooler of a hypersonic combined precooling cycle aero-engine utilizes ultra-low temperature coolant to precool incoming air, but faces issues of frost layer formation affecting performance. Experimental studies on microtubule precoolers under different humidity conditions are necessary. Results show that increasing freestream humidity leads to decreased heat transfer rates of the pre-cooler. Optimal mass ratios of anhydrous methanol for defrosting are found to be between 1.0 and 1.2.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hong Wei, Zhida Li, Xiaofeng Guo, Xuesen Yang, Wei Dong
Summary: This study aims to investigate the influence of airflow velocity on the frosting and defrosting performance of a compact precooler under actual air humidity conditions. The experimental results show that frosting has an adverse effect on the performance of the precooler, while defrosting improves the performance. The optimal defrosting performance is achieved when the mass ratio of methanol is approximately 1.1.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Xiao-feng Guo, Ning-ning Nan, Ben-xin Liu, Cheng-ming Fuyang, Jian-ming Gong, Hui-ling Jia, Xin Tan
Summary: In this study, an improved creep damage constitutive model based on the hyperbolic sine function is established, and it is calibrated and validated to reflect the creep behavior of stainless steel at high temperatures. The results show that some creep damage limits in the current ASME-NH code may not be conservative.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Energy & Fuels
Lan Gao, Elyes Nefzaoui, Frederic Marty, Xueyong Wei, Stephane Bastide, Yamin Leprince-Wang, Tarik Bourouina
Summary: This report presents a new class of metamaterials called meta-foams, which are designed for enhanced solar steam generation. The meta-foams are made up of a two-dimensional micro-pore array with precise dimensional control. Two fabrication technologies, plasma etching and 3D printing, were used to demonstrate the efficiency of the meta-foams. Experimental validation showed that the meta-foams achieved an unmatched evaporation rate of 1.34 kg/(h·m(2)) under 1 sun illumination, with a theoretical limit estimated at 1.5 kg/(h·m(2)), corresponding to an 89% conversion efficiency. The proposed model, which considers heat and mass transfer, photothermal conversion, and water phase change, can guide the optimization of meta-foams for various applications like solar heat harvesting and solar water purification.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
Hong Wei, Wei Dong, Xuesen Yang, Xiaofeng Guo, Zhida Li, Zhongfu Tang, Chao Fu
Summary: The compact heat exchanger is critical in the air-breathing combined precooling cycle engine of hypersonic aircraft, but it is prone to frosting, which decreases engine performance. Experimental results show that spraying anhydrous methanol or anhydrous ethanol significantly improves defrosting effectiveness and heat transfer rates.
Article
Physics, Applied
S. Sarkar, E. Nefzaoui, G. Hamaoui, F. Marty, P. Basset, T. Bourouina
Summary: This study explores the effect of surface doping on the radiative properties and absorptance of black silicon (BSi), and proposes a phenomenological explanation based on the dopant concentration profiles and the corresponding incident radiation penetration depth. The experimental results provide simple design rules for using ion-implanted BSi in various applications such as solar energy harvesting, thermo-photovoltaics, and infrared radiation sensing.
APPLIED PHYSICS LETTERS
(2022)
Article
Energy & Fuels
Chuanyu Zhang, Xiaofeng Guo, Laurent Royon, Patrice Chatellier
Summary: Wastewater from urban areas contains a significant amount of thermal energy, which exchanges with its surrounding environment. This study analyzes the thermal exchanges between wastewater and its immediate environment. A mathematical model is constructed to predict the water level and velocity in the sewer, allowing the calculation of heat transfer between the wastewater and surrounding soil. The results reveal the influence of wastewater on soil temperature within a certain distance and emphasize the potential of using the sewer network as an underground thermal storage system to improve urban energy efficiency.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Mechanics
Xiangshu Lei, Yingwen Liu, Peng Yang, Laurent Royon, Xiaofeng Guo
Summary: A theoretical model is established to study the physics of droplet dynamics on a vertical surface driven by vibration. Experimental and theoretical results show that the phase shift between droplet and plate reaches its peak at a lower frequency for larger droplets. Based on this phase shift mechanism, a strategy for promoting droplet coalescence is proposed. An optimal frequency and a large-bandwidth frequency range are identified for achieving maximum phase shift and successful droplet coalescence. These findings are significant for the application of vibrating surfaces in droplet removal.
Article
Optics
Daoming You, Manqing Tan, Xiaofeng Guo, Wentao Guo, Yingchun Cao, Wenbin Chen
Summary: In this study, the reflection index of superluminescent diodes (SLDs) is optimized by designing and fabricating antireflective (AR) films. The double-layer AR film, prepared by reactive magnetron sputtering, effectively reduces the ripple index and modulation index of SLDs. The optimized SLD chips maintain a high output power of 10 mW under a current of 100 mA.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2023)
Article
Physics, Fluids & Plasmas
Geyu Zhong, Yingwen Liu, Xiaofeng Guo, Laurent Royon, Philippe Brunet
Summary: In this paper, the flow structure generated by low-frequency forcing around a sharp tip is studied using direct numerical simulations. The periodic and steady responses are extracted within a large span of amplitude of vibrations. When the amplitude is smaller than the tip radius of curvature, the flow structure is similar to that observed at higher frequencies, with an intense central jet and a quadratic dependence for the streaming velocity with the oscillating velocity. At higher amplitudes, this scaling no longer holds and the streaming flow pattern loses its left-right symmetry. The mechanisms of the instability are analyzed from the careful examination of the instationary flow fields, and possible mechanisms involving the coupling between the streaming jet and instationary vorticity are proposed.
Article
Thermodynamics
Geyu Zhong, Chuanyu Zhang, Xiaofeng Guo, Peng Yang, Yingwen Liu
Summary: This research focuses on the formation and transmission process of oscillatory vortices in oscillatory flow driven by the periodical reverse of flow orientation. It explores the spatial-temporal relationships between fluid dynamics and energy transmission, providing insights into the underlying mechanisms of heat transfer enhancement in oscillating flow.
ASME JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Proceedings Paper
Automation & Control Systems
Hung-Jui Huang, Xiaofeng Guo, Wenzhen Yuan
Summary: This paper investigates dynamic tactile sensing for estimating liquid properties. A data-driven model based on simplified physical principles is proposed, and experiments show its accuracy and generality. The model can classify different liquids accurately and estimate volume and concentration with high precision.
ROBOTICS: SCIENCE AND SYSTEM XVIII
(2022)
Article
Polymer Science
Wencheng Shi, Boyu Wu, Xiaofeng Guo, Anchao Feng, San H. Thang
Summary: Fluorescent end-functional mikto-arm star copolymers were synthesized using a novel method and the linear correlation between fluorescence intensity and polymer concentration was verified. This method enables the quantitative analysis of the arm components of star polymers, providing a new approach for the characterization of star polymers.
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)
