Article
Construction & Building Technology
Nuno Simoes, Marcio Goncalves, Catarina Serra, Shahaboddin Resalati
Summary: The study indicates that the use of VIPs in buildings can be economically viable in high rental cost cities, presenting potential economic benefits and successfully penetrating the market.
BUILDING AND ENVIRONMENT
(2021)
Article
Energy & Fuels
Qianqian Sun, Jun Xu, Chaobo Lu, Shiyun Zhu, Gengye Lin, Mizi Fan, Jun Li, Kefu Chen
Summary: A new strategy was developed to prepare vacuum insulation panel (VIP) core materials using light, ecofriendly, and renewable kapok fibres. The kapok fibre VIPs showed excellent thermal insulation performance, with a thermal conductivity as low as 6.12 mW/(m center dot K) at an internal pressure of 0.05 Pa. These VIPs also demonstrated outstanding thermal performance stability, with only a 9-13% increase in thermal conductivity when the ambient temperature increased from 15 to 55 degrees C. The low density of the VIPs, below 105 kg/m(3), was attributed to the special thin-walled and large cavity structure of kapok fibres. Therefore, kapok fibres are a potential alternative to fume silica for sustainable, green, renewable, and eco-friendly VIPs.
Article
Thermodynamics
Ankang Kan, Xuexiang Zhang, Zhaofeng Chen, Dan Cao
Summary: A new type of vacuum insulation panels (VIPs) with recycled cotton fiber core was prepared and investigated in this study. The micromorphology of the recycled cotton core material, as well as the barrier and thermal conductivity of the prepared VIPs, was experimentally and mathematically analyzed. The results showed that VIPs with AF barrier envelopes performed better in terms of thermal conductivity, and the optimum gas pressure for VIPs' effective thermal conductivity was less than 0.1Pa. The VIPs with cotton fiber core material have good thermal properties and the dual characteristics of low cost and environmental protection.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Takao Katsura, Takato Miyata, Saim Memon, Ali Radwan, Katsunori Nagano
Summary: The issue of how to improve the insulation of windows is important for existing buildings. Structured-core transparent vacuum insulation panels (TVIPs) are proposed as a method to improve the insulation performance of existing building windows. The experimental results show that the use of coated core material and encapsulated getter agent can reduce the pressure rise and gas flow rate in TVIPs, making them closer to the actual application requirements.
Article
Agricultural Engineering
Xu Dong, Qianqian Zhang, Yuling Lan, Qinzhi Zeng, Mizi Fan, Lihui Chen, Weigang Zhao
Summary: In this study, a hybrid composite material made from bamboo fiber and glass fiber was used as the thermal insulation material for vacuum insulation panels (VIPs). The results demonstrated that the composite material exhibited a uniform fiber dispersion and a three-dimensional network structure, leading to a significant reduction in thermal conductivity while maintaining excellent aging performance.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Thermodynamics
Sankarshan Verma, Harjit Singh
Summary: Expanded perlites have been identified as potential core material candidates for vacuum insulation panels due to their lower cost compared to fumed silica. By altering their structural properties, such as particle size and porosity, the insulation properties of expanded perlites can be improved. Numerical calculations using finite element method showed a correlation between the thermal conductivity of perlite cores and their packing structures, providing a framework for designing cost-effective thermal insulation systems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Construction & Building Technology
Pedro Santos, Laura Sousa, Luis Godinho, Joao R. Correia, A. M. P. G. Dias
Summary: The experimental study focused on the acoustic and thermal behavior of a novel sandwich panel solution based on CLT, named CIT. Results showed that CIT panels had lower sound insulation than equivalent-thickness CLT panels due to mass differences, and analytical models failed to describe their behavior accurately. Variability in thermal resistance was found in both CLT and CIT panels, with the influence of wood's thermal conductivity being marginal due to the lower thermal conductivity of PUR in CIT panels.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Hideya Yamamoto, Daisuke Ogura
Summary: This study validates the theoretical model of the long-term performance of VIPs by measuring the internal pressure of VIPs and the construction environment on-site. The results show that the adsorption and release of gas by the getter are influenced by environmental conditions, and the temperature dependence is crucial for stabilizing the performance of VIPs.
ENERGY AND BUILDINGS
(2022)
Article
Green & Sustainable Science & Technology
Weigang Zhao, Wen Yan, Zhicheng Zhang, Haili Gao, Qinzhi Zeng, Guanben Du, Mizi Fan
Summary: Thermal insulation is a key technology in reducing energy consumption, and this study proposes an efficient method to develop innovative and cost-effective core materials for vacuum insulation panels (VIPs). The study investigates the effect of adding glass fiber to wood pulp fiber on the thermal insulation performance of the composite core materials. The results show that the thermal conductivity of the VIPs decreases with increasing glass fiber content, and the developed VIPs have comparable thermal insulation to commercial products.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Hideya Yamamoto, Daisuke Ogura
Summary: This study investigates the use of laminated films with metallized EVOH layers to prevent the permeation of dry air in vacuum insulation panels with a glass fiber core. The effect of temperature and humidity on the water-vapor transmission rate (WVTR) of metallized EVOH films is examined, and a new model that accounts for desiccant saturation is proposed and validated to accurately predict the long-term performance of VIPs under mixed gas permeation.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Mingli Li, Zhibin Lin
Summary: This study evaluates the feasibility of an energy-saving building wall by coupling VIP with PCM as a compact unit, which can significantly reduce heat flux through the wall, thereby leading to a tremendous reduction in energy consumption.
ENERGY AND BUILDINGS
(2021)
Review
Green & Sustainable Science & Technology
Houda Ajabli, Amine Zoubir, Rabie Elotmani, Mohamed Louzazni, Khalid Kandoussi, Abdelmajid Daya
Summary: Since the 1930s, thermal comfort has been a crucial topic in the construction industry. The use of natural materials, including vegetal fibers or recycled waste products, is being explored to enhance thermal comfort in buildings. This study examines the origins and progression of thermal comfort concepts and evaluates the potential of integrating bio-based materials in building envelopes for maintaining thermal comfort. The findings suggest that alternative insulation materials made from unusual sources can compete with conventional materials and offer good thermal conductivity.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Construction & Building Technology
Mahmood Alam, Marco Picco, Shahaboddin Resalati
Summary: This research proposes a holistic methodology for accurately assessing the financial and environmental feasibility of using thermal insulation materials in building retrofitting. The methodology is applied to a case study of an office building, where different types of insulation materials are simulated and analyzed under various climate conditions. The results show that the holistic approach, taking into account heating and cooling loads as well as space value, favors the use of advanced materials such as vacuum insulation panels, with a payback time of 1.3 to 4.2 years. However, the environmental assessment reveals that traditional materials like mineral wool have a significantly lower carbon payback time compared to vacuum insulation panels, suggesting the need for environmentally-friendly production processes.
BUILDING AND ENVIRONMENT
(2022)
Review
Construction & Building Technology
Ankang Kan, Ni Zheng, Wenbing Zhu, Dan Cao, Wei Wang
Summary: This paper introduces the research and application of vacuum insulation panels (VIPs) in China, which are high-performance insulation materials. It summarizes the concept, structure, and insulation mechanism of VIPs, as well as the latest achievements in core materials, barrier layers, and getters. The applications of VIPs in various fields are also discussed. The main current problems, such as optimizing thermal conductivity and improving service life, are defined, along with proposed solutions for further development.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Akos Lakatos, Zsolt Kovacs
Summary: In order to reduce the energy use of buildings, the use of insulation materials is a possible solution to improve energy efficiency. However, as regulations become stricter, thicker insulation materials are required. Research has started to focus on decreasing the thickness and thermal conductivity of materials, leading to the development of new types of insulation materials with lower thermal conductivity.
ENERGY AND BUILDINGS
(2021)
Article
Nanoscience & Nanotechnology
Zeinab El-Moussawi, Ali Nourdine, Lionel Flandin
Summary: This manuscript introduces the use of nitrophenyl-functionalized single-walled carbon nanotubes in organic photovoltaic cells and explores their potential as a replacement or doping material for the universal buckminsterfullerene PCBM acceptor. The study optimized the energy band position and functional degree, as well as the morphology of the active layer, to improve the device performance. The results suggest that controlling the nanotube functional degree and film morphology is crucial to avoid short circuits and achieve high efficiency.
APPLIED NANOSCIENCE
(2022)
Article
Chemistry, Physical
Emilie Planes, Lara Perrin, Muriel Matheron, Manon Spalla, Solenn Berson, Lionel Flandin
Summary: This study explores the stability of an uncharted mixed perovskite material optimized for low-temperature processable device architectures. The system showed remarkable stability under certain conditions but was jeopardized under more severe aging conditions. Advanced characterization techniques helped identify the degradation mechanisms and revealed an unexpected protective effect of gold electrodes.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Dorina T. Papanastasiou, Nicolas Charvin, Joao Resende, Viet Huong Nguyen, Abderrahime Sekkat, David Munoz-Rojas, Carmen Jimenez, Lionel Flandin, Daniel Bellet
Summary: In this study, intentionally prepared non-homogenous silver nanowire networks were used to investigate the mechanisms of failure under electrical stress. It was found that regions with higher current density are correlated to the origin of degradation. Additionally, the influence of a zinc oxide (ZnO) layer on electrical performances of non-homogeneous specimens was studied, showing improved performance compared to bare networks.
Article
Chemistry, Multidisciplinary
Ali Nourdine, Marwen Abdelli, Nicolas Charvin, Lionel Flandin
Summary: Nanostructuration of solar cells using ZnO nanowires as electron transport layer and nanocollectors of electrons within the active layer has been developed. The 3D hybrid photovoltaic solar cells show improved performance with a photovoltaic conversion efficiency of 7.7%, thanks to the meticulously controlled morphology and structure of the ZnONWs.
Article
Chemistry, Physical
Emilie Planes, Huu-Dat Nguyen, Thi Khanh Ly Nguyen, Nicolas Charvin, Lionel Flandin, Sandrine Lyonnard, Cristina Iojoiu
Summary: This work systematically studied the interplay between humidity-induced mechanical behavior and proton transport mechanism in multiblock aromatic ionomers, compared with Nafion. The water vapor transport mechanism was investigated using dynamical vapor sorption, and the impact of hydration and dehydration on membrane mechanical properties was elucidated using a dynamic mechanical analysis device with temperature- and humidity-controlled chamber, leading to an innovative understanding of these polymers and the estimation of relative amount of isolated and clustered water molecules.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Electrochemistry
Roselyne Jeanne-Brou, Nicolas Charvin, Gilles de Moor, Lionel Flandin, Sebastien Issa, Trang N. T. Phan, Renaud Bouchet, Didier Devaux
Summary: Research on solid polymer electrolytes (SPEs) based on poly(ethylene oxide) (PEO) is important for proposing an alternative to conventional liquid electrolytes, with the aim of improving both mechanical properties and ionic conductivity. Various strategies have been explored to increase the ionic conductivity of SPEs, such as developing new polymer architectures, lithium salt compositions, plasticizers, and additives. Furthermore, applying external fields or mechanical deformations onto SPEs can modify the resulting ionic transport properties, which presents challenges in determining the instantaneous evolution of the conductivity.
ELECTROCHIMICA ACTA
(2023)
Article
Energy & Fuels
Lara Perrin, Lionel Flandin, Cynthia Farha, Stephanie Narbey, David Martineau, Emilie Planes
Summary: In this study, perovskite deposition on mesoporous scaffolds based on metal oxide and carbon was achieved using inkjet infiltration, allowing for a clean industrial process for large-scale and stable perovskite devices. By implementing a maturation step, the photovoltaic performances of the devices were significantly enhanced from 10% to 14%. Various characterization techniques were used to investigate the mechanisms behind this enhancement, as well as the impact of the maturation step on performance durability.
Review
Materials Science, Multidisciplinary
Mirella Al-Katrib, Lara Perrin, Lionel Flandin, Emilie Planes
Summary: This article combines a critical review and experimental data to explore the use of electrodeposition in the manufacturing of perovskite solar cells. It evaluates the pros and cons of electrodeposition technique and investigates the impact of optimization parameters on the performance of perovskite solar cells through experiments. This research provides guidance for future development and large-scale application.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Chemical
Nikoleta Kyranaki, Lara Perrin, Lionel Flandin, Emilie Planes, Cynthia Farha, Lukas Wagner, Karima Saddedine, David Martineau, Stephane Cros
Summary: This study compares the efficiency of glass-glass and glass-backsheet encapsulations for carbon-based perovskite solar cells. The research identifies TiO2 and carbon layers as important barriers against moisture permeation, ensuring similar durability for both encapsulations in protecting perovskite from damp-heat aging.
Article
Energy & Fuels
Emilie Planes, Cynthia Farha, Gilles De Moor, Stephanie Narbey, Lara Perrin, Lionel Flandin
Summary: This study investigates the impact of maturation phenomenon on carbon-based perovskite solar cells and compares the effects of drop casting and inkjet printing. The results show that maturation affects the perovskite layer in drop-cast cells and the interfaces in inkjet-printed cells. This observation also highlights the influence of cell architecture and morphology on the maturation process.
Article
Chemistry, Physical
Thibault Lemercier, Emilie Planes, Lionel Flandin, Solenn Berson, Lara Perrin
Summary: This study evaluates the compatibility of two sputtering recipes for integrating a transparent ITO top electrode in perovskite solar cells. The optimized PIN-type semitransparent device architecture shows promising potential for tandem applications. The study demonstrates that semitransparent perovskite cells can recover their performance even after possible damage during the ITO integration process.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
T. Lemercier, L. Perrin, S. Berson, L. Flandin, E. Planes
Summary: To develop high-performance tandem cells, the optimization of PIN-type architecture with TFB as the HTL can significantly increase PCE. The methodology of observing defects in the perovskite layer is used for optimization.
MATERIALS ADVANCES
(2021)
Proceedings Paper
Energy & Fuels
Lara Perrin, Thibault Lemercier, Emilie Planes, Solenn Berson, Lionel Flandin
Summary: This paper focuses on the development of PIN devices using a mixed cations and anions perovskite and optimizing their performance to be comparable to NIP architectures.
2021 IEEE 48TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2021)
Proceedings Paper
Energy & Fuels
Emilie Planes, Lara Perrin, Muriel Matheron, Manon Spalla, Solenn Berson, Lionel Flandin
Summary: This study examines the stability of PSCs and evaluates the influence of ETL, HTL, and metallic electrode on their degradation, with the main results summarized in the paper.
2021 IEEE 48TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
(2021)
Article
Chemistry, Multidisciplinary
Nicolas Charvin, Joao Resende, Dorina T. Papanastasiou, David Munoz-Rojas, Carmen Jimenez, Ali Nourdine, Daniel Bellet, Lionel Flandin
Summary: Metallic nanowire networks are a promising solution for transparent and flexible devices, but they lack stability under thermal and electrical stresses. The degradation mechanism in the network is attributed to the formation of hot spots and the propagation of disruptive cracks. Comparisons with simulations on a 2D surface and in a metal thin film help deduce the average junction resistance between nanowires and understand the spatial correlation in network damage.
NANOSCALE ADVANCES
(2021)
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)
