Article
Energy & Fuels
Piotr Kosinski, Przemyslaw Brzyski, Maria Tunkiewicz, Zbigniew Suchorab, Damian Wisniewski, Pawel Palczynski
Summary: The article presents a study on the thermal insulation properties of raw hemp shives obtained from the Polish crop of industrial hemp. The focus of the study is on pore size distribution, thermal conductivity, and air permeability. The results show that the thermal conductivity coefficient increases with the increase in bulk density. The shives have a high porosity, with the majority of pores in the diameter range of 0.9-3 μm. The article also provides an example of using the tested material as thermal insulation for wooden frame walls and observes the clear influence of variables on temperature distribution through heat flow analysis.
Article
Chemistry, Multidisciplinary
Jiaying Zhu, Yeling Zhu, Yuhang Ye, Zhe Qiu, Yifan Zhang, Zhengyang Yu, Xia Sun, David C. Bressler, Feng Jiang
Summary: A simple strategy for scalable production of hemp microfibers and their assembly into aerogels with interconnected porous structures via an ice-templating technique is reported. These aerogels demonstrate low density, high superelasticity, and over 80% compressive strain. They also exhibit low thermal conductivity due to high porosity and structural tortuosity, suggesting potential in thermal insulation applications. Hydrophobic modification further reduces water affinity of these aerogels.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Thermodynamics
Lei Ni, Zhaofeng Chen, Phalguni Mukhopadhyaya, Xinyang Zhang, Qiong Wu, Qianhua Yu, Ganhua Miu
Summary: The study utilizes numerical simulation to investigate the thermal conductivity of fiber/powder porous media under vacuum conditions. Results show that finer powder diameter leads to smaller pore size and better ability to maintain lower effective thermal conductivity at higher pressure.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Materials Science, Textiles
Ajay Kumar, Dinesh Babu Shakyawar, Nehru Lal Meena, Syed Mohammed Khursheed Naqvi
Summary: Dumba fleece is a blend of fine wool and coarse hairy fibers, with recovered fine wool fibers accounting for 19.6% of fleece weight. These fibers can be spun into yarn with the use of carrier fiber, and when mixed with nylon staple fiber and fine crossbred wool, they create a harsh feel in the fabric. However, surface properties of the fabric can be improved through enzyme treatment and softener application.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Thermodynamics
Daniel Lopez Pedrajas, Manuel Carmona Franco, I Garrido Saenz, Francisco J. Ramos Mellado, Juan F. Rodriguez Romero, Ana M. Borreguero Simon
Summary: Lightweight gypsum composites with improved thermal and waterproof properties were produced by adding polystyrene nanoparticles. The addition of nanoparticles reduced the density and thermal conductivity of the composites while increasing the porosity. The synthesized gypsum blocks met the European standard regulation for compressive and flexural strengths.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Construction & Building Technology
Ritvars Freimanis, Andra Blumberga, Ruta Vanaga, Zigmars Zundans
Summary: Energy consumption in historic buildings is high compared to current energy efficiency standards. External insulation is limited by the heritage value of facades and limited external space in urban streets. Internal insulation can be an alternative but it is considered riskier due to moisture-related damage. This study evaluates the effect of vapor-open capillary-active calcium silicate internal insulation on the hygrothermal behavior of masonry in cold climates.
Article
Engineering, Multidisciplinary
Xianglong Hu, Min Huang, Nizao Kong, Fei Han, Ruixuan Tan, Qizhong Huang
Summary: Coating SiC ceramic layer on mesophase pitch-based carbon fibers surface can improve thermal conductivity and electrical insulation, offering a new approach for thermal conductive fillers in electronic packaging.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Textiles
Jian Hu, Xiaojun Li, Ruonan Han, Jieyu Xue, Zhaoying Zhang, Jing Peng, Jiayu Tian, Yong Yang
Summary: In this paper, glass fiber felt (GFF) was prepared using the papermaking technique. The study investigated the relationship between the characteristics of the glass fiber suspension and the physical properties (uniformity, air permeability, and sound insulation) of GFF. The results showed that increasing the dispersing times and speeds improved the viscosity and fiber hanging property of the glass fiber suspension, as well as the uniformity of GFF. However, it had no significant impact on the air permeability of GFF. Increasing the dispersing times decreased the sound transmission loss (STL), while changing the dispersing speeds enhanced STL. The optimal dispersing speed was 3000 r/min, achieving an STL of 15.78 dB at 6300 Hz. Overall, GFF can be used as an acoustic material for building and transportation.
JOURNAL OF INDUSTRIAL TEXTILES
(2023)
Article
Engineering, Environmental
Hai M. Duong, Nathaniel R. B. Ling, Quoc B. Thai, Duyen K. Le, Phuc T. T. Nguyen, Xue Yang Goh, Nhan Phan-Thien
Summary: In this study, fly ash is converted into an advanced aerogel with properties such as low density, high porosity, excellent thermal and acoustic performance, and high compressive Young's modulus. The newly developed fly ash aerogel is considered a potential material for applications in thermal insulation, sound absorption, and lightweight composites.
Article
Thermodynamics
Shanshan Cai, Zifan Liu, Xu Li, Hongyang Xu, Lizhi Xia, Lorenzo Cremaschi
Summary: This study proposes a multiscale effective thermal conductivity model combined with liquid phase distribution to investigate the influence of internal structure on the thermal behavior of closed-cell thermal insulation in the presence of moisture. The correlations between structural parameters, saturation, and effective thermal conductivity are analyzed. A critical saturation point is proposed and its impact factors are discussed. The influence of liquid phase distribution is mainly seen at low saturation at the REV scale, while significantly reduced at the macro scale.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Ceramics
Yang Liu, Zhiyang Zhao, Yong Kong, Chen Chu, Jinqiong Tang, Jian Ren, Xiaodong Shen
Summary: This study investigates a low-cost, high-performance preparation method for nano-SiO2 composites, demonstrating their potential in thermal insulation. The introduction of SiC significantly improves the thermal insulation performance.
CERAMICS INTERNATIONAL
(2022)
Article
Polymer Science
Sohrab Veiseh, Ali A. Yousefi
Summary: The relationship between EPS density and compressive stress at 10% deformation and thermal conductivity was studied. Experimental results showed that thermal conductivity decreases non-linearly with increasing EPS density, while compressive stress at 10% deformation increases linearly with the increase of EPS density.
IRANIAN POLYMER JOURNAL
(2021)
Article
Construction & Building Technology
Lexi Tu, Huimin Zhang, Jilong Wang, Jiahui Sun, Guangbiao Xu, Fumei Wang, Hua Shen
Summary: In this study, a three-dimensional model was used to investigate the fluid motion and heat transfer in both air inflatable and fiber-filled textiles. The experimental and numerical results showed good agreement, validating the proposed model. Various parameters, including thickness, surface emissivity, and ambient temperature, were found to significantly affect heat flux, thermal resistance, and fluid flow behavior.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Brahim Mazhoud, Florence Collet, Sylvie Pretot, Christophe Lanos
Summary: This study experimentally investigates the effects of clay stabilization and hemp content on hygric and thermal performances of composites. It reveals that the designed composites exhibit excellent moisture buffering properties and thermal conductivity suitable for distributed insulation. The linear relationships between hemp content, binder types, density, and water content are identified in this study.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Textiles
Przemyslaw Brzyski, Piotr Kosinski, Aneta Zgliczynska, Pawel Iwanicki, Jakub Poko
Summary: The study demonstrates that raw flax shives can be used as thermal insulation material, with satisfactory thermal conductivity and water vapor permeability. Additionally, the shives have high water absorption capacity and the ability to quickly uptake water through capillary action.
JOURNAL OF NATURAL FIBERS
(2021)
Article
Chemistry, Physical
Piotr Kosinski, Przemyslaw Brzyski, Zbigniew Suchorab, Grzegorz Lagod
Article
Chemistry, Physical
Piotr Bilko, Aneta Skoratko, Andrzej Rutkiewicz, Leszek Malyszko
Summary: This study utilized Arkan shear tests with digital image correlation to evaluate the shear properties in the plane defined by the two principal axes of material orthotropy, considering different grain orientation directions. Two methods were used to obtain elastic properties based on DIC results, and a continuum structural model was used for failure analysis. The numerical simulations after implementing the model showed failure mechanisms observed in experimental tests.
Article
Chemistry, Physical
Jacek Katzer, Aneta Skoratko
Summary: The research validated the quasi-plastic behavior of concrete-plastic columns, showing they can withstand certain strains and maintain load capacity. By utilizing columns with fractal-based cross-sections, it is possible to achieve greater strain resistance.
Review
Chemistry, Physical
Aneta Skoratko, Jacek Katzer
Summary: Additive manufacturing technology, particularly 3D printing of plastics, has gained increasing interest in the construction industry in recent years. Printing plastic reinforcements for concrete elements can greatly improve efficiency, reduce waste, and optimize shapes. Various applications and challenges for further research and practical applications were discussed in this review.
Review
Construction & Building Technology
Shady Attia, Piotr Kosinski, Robert Wojcik, Arkadiusz Weglarz, Dariusz Koc, Oriane Laurent
Summary: The study evaluates the current state and future trends of the Polish energy market, indicating a significant gap in the energy efficiency sector. It suggests enhancing awareness and capacity building, as well as developing accessible guidelines to ensure the transformation is correctly implemented.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Jacek Katzer, Aneta Skoratko
Summary: The concept of steel fibre reinforced concrete-plastic columns is proven and discussed in this paper. The 3D printed plastic stay-in-place formwork acts as a substitute for traditional formwork. The experiment demonstrates that columns with fractal-based cross-sections exhibit smooth destruction processes and significant formwork deformations, while columns with traditional circular and square cross-sections experience sudden destruction. These results prove the feasibility of using 3D printed plastic and steel fibre reinforced concrete as an alternative to traditional formwork and ordinary concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Piotr Kosinski, Przemyslaw Brzyski, Maria Tunkiewicz, Zbigniew Suchorab, Damian Wisniewski, Pawel Palczynski
Summary: The article presents a study on the thermal insulation properties of raw hemp shives obtained from the Polish crop of industrial hemp. The focus of the study is on pore size distribution, thermal conductivity, and air permeability. The results show that the thermal conductivity coefficient increases with the increase in bulk density. The shives have a high porosity, with the majority of pores in the diameter range of 0.9-3 μm. The article also provides an example of using the tested material as thermal insulation for wooden frame walls and observes the clear influence of variables on temperature distribution through heat flow analysis.
Article
Energy & Fuels
Piotr Kosinski, Aldona Skotnicka-Siepsiak
Summary: This paper presents the need for modernization and implementation of the green university concept at the University of Warmia and Mazury in Olsztyn. The energy analysis of a selected lecture hall is conducted, comparing different scenarios and considering thermal comfort for users. The optimal solution is found to be a combination of heat pump and photovoltaic panels. The research results can serve as a reference for similar projects in Central and Eastern Europe.
Article
Construction & Building Technology
Shady Attia, Jarek Kurnitski, Piotr Kosinski, Anatolijs Borodinecs, Zsofia Deme Belafi, Kistelegdi Istvan, Hrvoje Krstic, Macedon Moldovan, Ion Visa, Nicolay Mihailov, Boris Evstatiev, Karolis Banionis, Miroslav Cekon, Silvia Vilcekova, Karel Struhala, Roman Brzon, Oriane Laurent
Summary: This study examines the barriers to implementing nearly zero-energy buildings (nZEB) in ten Eastern European countries. The results show that most of these countries face challenges in complying with guidelines and cost-optimality approaches. The paper ranks each country and recommends specific measures to refine the nZEB definitions, providing opportunities for the future development of climate-neutral high-performance buildings.
ENERGY AND BUILDINGS
(2022)
Article
Construction & Building Technology
Aneta Skoratko, Tomasz Szatkiewicz, Jacek Katzer, Marcin Jagoda
Summary: This text discusses the application of 3D printed plastic spatial reinforcing elements in civil engineering. Despite the lower mechanical properties of 3D printed plastics compared to traditional steel re-bars, the spatial geometric shapes of plastic reinforcement can minimize some of these differences. Experimental results show that the properties of plastic-mortar elements are similar to good-quality steel fiber-reinforced concrete, making them a possible substitute for steel reinforcements. Future research directions and current applications are also discussed in the article.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Multidisciplinary
Piotr Kosinski, Bartosz Kask, Malgorzata Franus, Magdalena Pilat-Rozek, Joanna Szulzyk-Cieplak, Grzegorz Lagod
Summary: The storage and disposal of sewage sludge from municipal wastewater treatment plants is a growing global problem. Researchers are searching for innovative technologies to manage this waste. Firing sewage sludge in furnaces and producing lightweight aggregates and granules presents a potential solution, as these granules can be used as substitutes for commonly used materials in construction. However, the incomplete decomposition of sewage sludge during biogas production remains a challenge. The purpose of this research was to evaluate the heat-insulating properties of granules produced from sewage sludge.
ADVANCES IN SCIENCE AND TECHNOLOGY-RESEARCH JOURNAL
(2023)
Proceedings Paper
Chemistry, Physical
Piotr Kosinski, Przemyslaw Brzyski, Zbigniew Suchorab, Grzegorz Lagod
THERMOPHYSICS 2020: 25TH INTERNATIONAL MEETING
(2020)
Proceedings Paper
Thermodynamics
Przemyslaw Brzyski, Piotr Kosinski, Aneta Skoratko, Wojciech Motacki
CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST)
(2019)
Proceedings Paper
Thermodynamics
Przemyslaw Brzyski, Piotr Kosinski, Aneta Skoratko
CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST)
(2019)
