Article
Thermodynamics
Zhigang Zhang, Yu Wang, Wanxiang Yao, Feng Gao, Chunhui Shou
Summary: The heat transfer characteristics of a wall implanted with heat pipes differ significantly from that of an ordinary wall, and are crucial in reducing a building's energy consumption.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Zhigang Zhang, Qiaoli Liu, Wanxiang Yao, Wei Zhang, Jingfu Cao, Haiyan He
Summary: In this paper, the internal temperature distribution characteristics of wall implanted with heat pipes (WIHP) were studied through numerical simulation. The thermal conversion efficiency was proposed to evaluate the utilization of solar energy by WIHP. The energy saving potential of WIHP in heating season was also analyzed.
Article
Construction & Building Technology
Zhigang Zhang, Ming Wu, Wanxiang Yao
Summary: The installation of heat pipes on the wall can increase indoor temperature, improve temperature distribution, reduce dissatisfaction rate, and enhance thermal comfort during the transition season.
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Construction & Building Technology
Abdellah Mellaikhafi, Mohamed Ouakarrouch, Abderrahim Benallel, Amine Tilioua, Mahmoud Ettakni, Abdelhak Babaoui, Mohammed Garoum, Moulay Ahmed Alaoui Hamdi
Summary: The study demonstrates that incorporating plant waste fibers into adobes can enhance the thermal properties of the samples, with different types of fibers having varying effects on thermal insulation performance. Pinnate leaf fibers show the best insulation property, significantly reducing heat flux.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Saif Ullah Khalid, Hafiz Muhammad Ali, Muhammad Ali Nasir, Riffat Asim Pasha, Zafar Said, L. Syam Sundar, Ahmed Kadhim Hussein
Summary: Heat pipes are widely used for thermal management, and comparing the performance of sintered copper wick and grooved heat pipes shows significant differences in capillary pressure, operating temperature, and thermal resistance, with grooved heat pipes reaching equilibrium faster.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Construction & Building Technology
Mustapha Mahdaoui, Said Hamdaoui, Abdelouahad Ait Msaad, Tarik Kousksou, Tarik El Rhafiki, Abdelmajid Jamil, Mohammed Ahachad
Summary: The study investigates the use of phase change material (PCM) in Moroccan buildings to improve the thermal performance of external walls. Through physical modeling and numerical analysis, it is found that the use of PCM can stabilize and reduce indoor temperature fluctuations, significantly improving the thermal inertia of buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Oussama Zine, Driss Taoukil, Ikram El Abbassi, Najma Laaroussi, El-Hadj Kadri, Mohammed lhassane Lahlaouti, Abdelmajid El Bouardi
Summary: This study focuses on developing a new bio-sourced insulation material using sawdust waste. The thermal characteristics, time lag, and decrement factor of an external wall insulated with these panels were investigated. The results showed that increasing density led to an increase in thermal conductivity, thermal diffusivity, and volumetric heat capacity, while thermal diffusivity decreased. The position of the insulation layer had a significant effect on thermal inertia properties, and insulation on the outside was found to be the most desirable.
JOURNAL OF BUILDING ENGINEERING
(2023)
Review
Thermodynamics
A. L. Sriram Sudhan, K. Ramachandran, A. Brusly Solomon, C. P. Jawahar
Summary: Heat pipes are silent heat transfer devices that utilize boiling and condensation for operation and have undergone several technological upgrades. This paper reviews the performance of heat pipes with nanoparticles deposition and suitable coatings, summarizing various heat transfer mechanisms involved. The study aims to provide a better understanding of the required improvements in cooling devices for future research and development of advanced cooling gadgets.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Construction & Building Technology
Qudama Al-Yasiri, Marta Szabo
Summary: This study experimentally investigated the optimal thickness of a phase change material (PCM) layer in composite roofs under severe exterior temperatures. The results showed that a 20 mm PCM thickness provided the best thermal performance, significantly reducing room temperature compared to the reference roof.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Environmental Sciences
Shaik Saboor, Arumugam Chelliah, Kiran Kumar Gorantla, Ki-Hyun Kim, S. -H. Lee, Zang Ho Shon, Richard J. C. Brown
Summary: This study presents a design strategy for wall envelopes to improve thermal performance in non-airconditioned buildings and reduce energy costs in air-conditioned buildings. Experimental measurements of building materials were used to optimize composite wall designs, resulting in substantial energy cost savings and enhanced thermal performance, particularly for laterite stone. The findings demonstrate the potential for simple design strategies to promote energy efficiency in buildings.
ENVIRONMENTAL RESEARCH
(2021)
Article
Thermodynamics
Carolina Cardenas-Ramirez, Maryory A. Gomez, Franklin Jaramillo, Andres F. Cardona, Angel G. Fernandez, Luisa F. Cabeza
Summary: In this study, the thermal performance of three SS-PCM based on eutectic fatty acid mixtures was evaluated, and an SS-PCM-based acrylic plaster was tested as a fiber cement siding finish. The results showed that using phase change materials in powder form significantly increased thermal lag, and the SS-PCM-based acrylic plaster coating effectively reduced indoor temperature.
Article
Thermodynamics
Yuguo Gao, Qianchao Hu, Yitao Ren, Xinyu Wang, Shuman Guo, Zhonglan Hou, Pengyan Guo
Summary: Nanofluids have been found to effectively enhance the heat transfer performance of different types of heat pipes. This paper provides a comprehensive literature review on the application of nanofluids in thermosyphon heat pipe, pulsating heat pipe, and wick heat pipe. The influence of important variables such as different nanoparticles, concentrations, packing ratios, inclination angles, and thermal loads on heat pipe performance is discussed. Studies show that there is an optimal nanoparticle concentration for highly efficient utilization. The enhanced heat transfer performance is attributed to the enhanced Brownian motion, improved surface wettability, increased nucleation sites, and inherently high thermal conductivity of nanofluids. Finally, the current problems and future trends of heat pipe technology based on nanofluids are discussed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Review
Energy & Fuels
Andhy M. Fathoni, Nandy Putra, T. M. Indra Mahlia
Summary: Heat pipes are widely used in the thermal management systems of electric vehicle batteries to control the working temperature and reduce the risk of thermal runaway. Besides traditional heat pipes, hybrid thermal management systems based on heat pipes are also worth exploring and researching.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Wei Guo, Fulin Kong, Xiufen He, Yuxin Liu, Chengcheng Wang, Lige Tong, Li Wang, Chuanping Liu
Summary: This paper uses CFD tool to investigate the real-time correspondence between wall temperature change and Taylor bubble location, and further improve the accuracy of thermal diffusion measurement. The results show that the increase in wall temperature is positively correlated with the length of the Taylor bubble.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Gongxing Yan, Mohammad Javad Kholoud, As'ad Alizadeh, Dheyaa J. Jasim, Navid Nasajpour-Esfahani, Ahmed Salah Al-Shati, Mahmoud Shamsborhan
Summary: Heat pipes are effective tools for recovering and conserving thermal energy. Thermosiphons, widely used devices, transfer heat between hot and cold sources without the use of external energy. This paper investigates the effects of various variables on the performance of thermosiphon heat pipes, such as working fluid, pipe length, mesh screen wick structure, and internal adiabatic wall. The results show that using an internal adiabatic wall can greatly improve the heat pipe's performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.