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
Thermodynamics
Muslum Arici, Feyza Bilgin, Michal Krajcik, Sandro Nizetic, Hasan Karabay
Summary: Using two layers of phase change material (PCM) is an effective method to reduce thermal loads in buildings. This study maximized the utilization of latent heat by splitting the PCM into two layers and adjusting their melting temperature, demonstrating that the design of two PCM layers can result in higher energy savings and improved thermal comfort.
Article
Chemistry, Multidisciplinary
Md Hasan Zahir, Mohammad Mominur Rahman, Salem K. S. Basamad, Khaled Own Mohaisen, Kashif Irshad, Mohammad Mizanur Rahman, Md Abdul Aziz, Amjad Ali, Mohammad M. Hossain
Summary: In this study, PEG-10MgCaCO(3) has been found to have the smallest particle size and a good porous structure, allowing for an impregnation rate of 69% of PEG and a high latent heat of 152.5 J/g, surpassing comparable materials.
Article
Green & Sustainable Science & Technology
Mohammad S. Bagazi, Ammar A. Melaibari, Ahmed B. Khoshaim, Nidal H. Abu-Hamdeh, Abdulmohsen O. Alsaiari, Hani Abulkhair
Summary: The study found that using phase change materials (PCMs) as insulators in buildings in Saudi Arabia can reduce energy consumption and provide a more comfortable indoor temperature. In the experiment, PCM RT35 provided better cooling effects at the highest temperature, while PCM RT35HC performed better in saving energy and keeping rooms warm at the lowest temperature.
Article
Energy & Fuels
Wondu Lee, Jooheon Kim
Summary: This study prepared novel phase change material composites with high thermal conductivity and latent heat by grafting palmitic acid and expanded graphite onto poly(dimethylsiloxane) (PDMS). These composites show potential in thermal management and electronic packaging fields.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
V Ljungdahl, K. Taha, J. Dallaire, E. Kieseritzky, F. Pawelz, M. Jradi, C. Veje
Summary: This study investigates the theoretical and experimental aspects of a Phase Change Material (PCM)-based ventilation system module, developing a numerical model to predict the system's dynamic performance. The optimal PCM melting temperature is found to significantly increase cooling capacity compared to the reference temperature. The study highlights the importance of PCM mass and melting temperature in optimizing the efficiency and performance of the PCM-driven ventilation system.
Article
Energy & Fuels
Atef Chibani, Slimane Merouani, Fouzi Benmoussa
Summary: This study numerically investigates the melting process of phase change materials and metal foams in a latent thermal energy storage unit, finding that metal foam-PCM systems outperform nano- and pure-PCM systems, significantly reducing melting time and showing potential for practical applications and energy waste reduction.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Philani Hlanze, Aly Elhefny, Zhimin Jiang, Jie Cai, Hamidreza Shabgard
Summary: This paper presents a novel energy storage solution using phase change material panels in supply ducts to increase a building's thermal storage capacity and demand flexibility. The simulations show that PCM storage can significantly reduce on-peak energy consumption and seasonal cooling electricity cost.
Article
Energy & Fuels
Takahiro Kawaguchi, Hiroki Sakai, Ryosuke Ishida, Yuto Shimizu, Ade Kurniawan, Takahiro Nomura
Summary: This study presents an improved method for the preparation of microencapsulated PCM with high heat storage density and cyclic durability, showing promise for future medium-to-high temperature heat applications.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Yuto Shimizu, Takahiro Kawaguchi, Hiroki Sakai, Kaixin Dong, Ade Kurniawan, Takahiro Nomura
Summary: In this study, an MEPCM using Al-5 wt.%Ni alloy was developed, which exhibited high latent heat capacity with a higher melting and solidification point. The developed MEPCM maintained its original shape and high latent heat capacity, even after multiple cycles of melting and solidification. Al-Ni alloy-based MEPCM is expected to be applied in the next-generation high-temperature latent heat thermal energy storage systems.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Engineering, Multidisciplinary
Wondu Lee, Jooheon Kim
Summary: In this study, novel thermally conductive PCM composites were prepared by grafting cellulose nanofibers and covering with aluminum nitride, exhibiting high through-plane thermal conductivity and latent heat. These composites enable efficient thermal management and have high tensile strength.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Energy & Fuels
Alireza Mirshekar, Mohammad Reza Goodarzi, Davod Mohebbi-Kalhori, Mohammad Hossein Shafiei Mayam
Summary: This study conducts an experimental investigation on the effects of using phase change materials (PCMs) embedded in open-cell copper foam in the heat sink during the heating and cooling process. Paraffin RT55 is employed as the phase change material. The results show that the sample with copper foam partially filled with paraffin has the lowest temperature compared to other samples, and the introduction of paraffin in the heat sink reduces the temperature during the heating and cooling processes.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Energy & Fuels
Yongliang Shen, Abdur Rehman Mazhar, Shuli Liu
Summary: This study reviewed literature on cascaded latent heat storage (CLHS) technology to analyze the research progress, challenges, and future directions. The results showed that the thermal advantages of CLHS can be further enhanced by optimizing the structure of the heat storage unit and the physical properties of the phase change material (PCM). The main challenges of this technology are the selection, development, and distribution of PCMs. Future research should focus on developing more accurate intelligent optimization algorithms and dynamic models, as well as studying practical applications in low-temperature thermal energy storage and cold storage.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Yuto Shimizu, Shunsuke Cho, Takahiro Kawaguchi, Keita Tanahashi, Kaixin Dong, Tomokazu Nakamura, Ade Kurniawan, Melbert Jeem, Takahiro Nomura
Summary: A core-shell-type microencapsulated phase change material (MEPCM) with a ternary eutectic alloy system was successfully developed for the first time in this study. The MEPCM exhibited a high melting point and latent heat, and had a significantly higher heat storage density compared to other reported MEPCMs. Furthermore, it showed great durability, retaining over 90% of its latent heat capacity after 100 cycles of heat storage and release tests.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Thermodynamics
Madhu Agarwal, Brijesh Kuldeep, Annie P. John, Karishma Maheshwari, Rajeev Dohare
Summary: In this study, beeswax was used as a phase change material to store heat, and its thermal conductivity and melting point were improved by adding nanoparticles and other phase change materials. FeO nanoparticles were found to give the best result for enhancing thermal conductivity, and the addition of coconut oil helped lower the melting point of the beeswax. The composite of beeswax and coconut oil with FeO nanoparticles showed the best performance in terms of charging time reduction.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Donghoon Yoo, Joohyun Lee, Byeongchan Lee, Suyong Kwon, Junemo Koo
HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Seongmi Kang, Seok-gil Yong, Jinho Kim, Heungshin Jeon, Hunhee Cho, Junemo Koo
BUILDING SIMULATION
(2018)
Article
Construction & Building Technology
Jinkyun Cho, Yundeok Kim, Junemo Koo, Woopyeng Park
ENERGY AND BUILDINGS
(2018)
Article
Agriculture, Dairy & Animal Science
Samuel Mezemir Yimenu, Junemo Koo, Ji-Young Kim, Jong-Hoon Kim, Byeong-Sam Kim
Article
Thermodynamics
Hajin Song, Jiyoung Kim, Byeong-Sam Kim, Junemo Koo
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
(2019)
Article
Engineering, Mechanical
Kyungmin Kim, Joohyun Lee, Junemo Koo
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2019)
Article
Agriculture, Dairy & Animal Science
Samuel Mezemir Yimenu, Junemo Koo, Byeong Sam Kim, Jong Hoon Kim, Ji Young Kim
Article
Construction & Building Technology
Seok-Gil Yong, Jinho Kim, Jinkyun Cho, Junemo Koo
JOURNAL OF BUILDING ENGINEERING
(2019)
Article
Construction & Building Technology
Sungmin Yoon, Doosam Song, Jaehun Kim, Joowook Kim, Hyunwoo Lim, Junemo Koo
BUILDING AND ENVIRONMENT
(2020)
Article
Food Science & Technology
Ji-Young Kim, Byeong-Sam Kim, Jong-Hoon Kim, Seung-Il Oh, Junemo Koo
Article
Energy & Fuels
Younhee Choi, Doosam Song, Sungmin Yoon, Junemo Koo
Summary: This study compares the accuracy of predicting energy loads in building design using Latin Hypercube Sampling (LHS) and Fractional Factor Design (FFD) methods. It was found that window insulation and Solar Heat Gain Coefficient have nonlinear characteristics on cooling and heating loads within the considered range of design parameters. LHS showed better prediction accuracy than FFD by considering the nonlinear impacts for a given number of treatments.
Article
Construction & Building Technology
Soo Bhin Park, Ju-Hyeong Park, Young Min Jo, Doosam Song, Sujeong Heo, Tae Jeong Lee, Sowoo Park, Junemo Koo
Summary: The study developed a dynamic mass balance model to predict indoor particle concentrations, finding that the operation of an air purifier effectively reduced indoor PM2.5 concentrations but had little impact on PM2.5-10 concentrations. Proposed guidelines recommended starting the air purifier when indoor PM2.5 concentrations were close to the standard without operation, and stopping it when concentrations fell below the standard without operation.
BUILDING AND ENVIRONMENT
(2022)
Article
Engineering, Chemical
Sowoo Park, Doosam Song, Young Min Jo, Ju-Hyeong Park, Tae Jeong Lee, Junemo Koo
Summary: Due to the hazardous effects of particulate matter (PM) exposure on students and teachers and the high PM concentration issue in South Korea, air purifiers have been installed in most classrooms to improve air quality. However, challenges such as operational costs and noise have hindered their continuous operation. This study develops a grey-box model using measured data and physical differential equations to dynamically predict indoor PM concentration and activate air purifiers when necessary.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Construction & Building Technology
Junemo Koo, Young Min Jo, Tae Jeong Lee, Sowoo Park, Doosam Song
Summary: During the COVID-19 pandemic, schools in South Korea faced a trade-off problem between airborne transmission risks and elevated indoor PM2.5 concentrations due to increased ventilation rates. This study quantitatively analyzed the impact of ventilation rate on indoor PM2.5 concentrations and COVID-19 transmission risk in classrooms. The results provide important insights into the trade-off between ventilation rate and COVID-19 transmission risk, and can be used to develop strategies for mitigating both risks and ensuring safety.
BUILDING AND ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Kisoo Kim, Junemo Koo, SangJun Moon, Won Gu Lee
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)