Article
Thermodynamics
Jiaheng Yu, Thao T. T. Nguyen, Anisha Pawar, Peter C. Wayner, Joel L. Plawsky, David F. Chao, Ronald J. Sicker
Summary: The Constrained Vapor Bubble (CVB) design was studied in microgravity aboard the ISS, showing how different condenser temperatures affect heat transfer and fluid flow behavior with different working fluids. Results were summarized onto a single Nusselt number vs. Marangoni number curve, showing a decrease in Nusselt number with increasing Marangoni number to the 1/3 power.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zehui Yang, Yunfei Zhang, Lizhan Bai, Haonan Zhang, Guiping Lin
Summary: In this work, a stainless steel-ammonia loop heat pipe with a rectangular evaporator and longitudinal replenishment was designed and tested. The startup characteristics, dynamic operation, heat transfer limit, and thermal resistance were investigated through extensive experiments. The results showed that the LHP exhibited excellent startup performance and could reach a heat transfer limit up to 110 W. The heater area and position played a significant role in the heat transfer limit.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
A. Allouhi, M. Benzakour Amine
Summary: This study aims to characterize the performance of a heat pipe flat plate solar collector using different nanofluids, with CuO-based nanofluid showing the highest enhancements in energetic and exergetic efficiencies. The decrease in specific heat of nanofluids is identified as the main thermal property responsible for performance improvement.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Thermodynamics
M. Sakthi Priya, D. Sakthivadivel
Summary: This study investigates the thermal performance of a novel design of a non-uniform structure heat pipe. The results show that the non-uniform structure heat pipe can significantly reduce thermal resistance and improve thermal efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Hong-Jin Joo, Hee-Youl Kwak, Minsuk Kong
Summary: The present study experimentally investigates the effect of twisted tape inserts on the thermal performance of an eccentric inlet and outlet heat pipe evacuated-tube solar thermal collector (HP-ESTC). The results show that the addition of twisted tape inserts enhances heat transfer performance by eliminating stagnation flow, reducing flow skewness, and generating rotating flow. A comprehensive performance analysis considering both heat transfer and pressure drop characteristics confirms that using twisted tape inserts can improve overall performance by approximately 7.7%. To assess its applicability for commercial HP-ESTCs, an HP-ESTC containing twisted tape inserts was manufactured and tested outdoors.
Article
Thermodynamics
S. C. Zhao, Zikang Zhang, Runze Zhao, Tong Wu, Xiaoyu Zhang, Z. C. Liu, Wei Liu
Summary: A reliable cooling solution for high power electronic devices was proposed in this paper, which involved the design of two loop heat pipe systems with flat-plate evaporator. The thermal performance of the loop heat pipe with a new refrigerant, R1234ze (E), was investigated. Two cooling methods, liquid-condenser and air-condenser, were designed to meet different cooling requirements. The reliability of the solution was fully verified, and the system showed quick response and no failures under different operating conditions. The liquid-condenser achieved a maximum heat load of 270 W (16.9 W/cm2), while the air-condenser had a normal operating range of 10 W-150 W with a fan power of 20 W.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Engineering, Multidisciplinary
Kunru Ma, Zhichao Wang, Xuefeng Li, Pin Wu, Siqi Li
Summary: The study optimized the structure and material of the collector/evaporator in the DX-SASIHP system using the CFD method to improve heating performance, identifying the best parameter combination.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Mohammad Shafiey Dehaj, Mehdi Ahmadi, Mostafa Zamani Mohiabadi
Summary: The study indicated that using metal oxide nanofluids can significantly improve the efficiency of heat pipe solar collectors, with a maximum efficiency of 83% achieved. Furthermore, increasing the mass concentration of metal oxide nanoparticles and volume flow rate can further enhance the efficiency.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Thermodynamics
Kishor Deshmukh, Suhas Karmare, Pradeep Patil
Summary: The convective heat transfer performance of U-pipe evacuated tube solar thermal collector with TiN nanofluid was investigated in this study. TiN nanoparticles with sizes of 40-50 nm were dispersed in distilled water at different volume concentrations. The stability and thermophysical properties of TiN nanofluid were experimentally measured. The experimental investigation included the convective heat transfer coefficient, friction factor characteristic, and solar thermal efficiency at different volume concentrations and mass flow rates. The performance of the solar thermal collector was tested under outdoor conditions. A correlation was proposed to determine the Nusselt number, friction factor, and solar thermal efficiency in laminar flow. The TiN nanofluid was recommended for industrial solar thermal applications due to its notable improvement in convective heat transfer performance despite the friction factor penalty.
APPLIED THERMAL ENGINEERING
(2023)
Article
Environmental Sciences
Garima Nema, Karunamurthy Krishnasamy
Summary: An experimental investigation was conducted on a solar evacuated tube collector combined with a heat pipe arrangement and attached to a single slope solar desalination system. The study analyzed the system's performance under different flow rates and water depths, and evaluated its feasibility based on thermodynamics, energy, CO2 emissions, and economics. The findings showed that the system achieved maximum freshwater yield and thermal efficiency at a flow rate of 0.001 kg/s and a water depth of 0.01 m. Compared to a traditional desalination system, the proposed system showed significant improvements in freshwater yield and thermal efficiency.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Nguyen Phan, Yuki Saito, Naoki Katayama, Hosei Nagano
Summary: This study presents the operating characteristics of a dual flat-evaporator loop heat pipe for single heat source cooling in any orientation, comparing its performance with other single evaporator LHPs. The results show that the performance of the dual flat-evaporator LHP remains relatively stable across different orientations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Depu Lu, Rongjian Xie, Jiajia Wen
Summary: In this paper, a new type of multi-evaporator loop heat pipe prototype with a dual-layer condenser was designed, which showed uniform and symmetrical layout of pipelines. The prototype demonstrated successful start-up in different heating modes and good heat sharing characteristic.
JOURNAL OF THERMAL SCIENCE
(2023)
Review
Thermodynamics
Hong Li, Hongyuan Liu, Min Li
Summary: This paper provides a comprehensive overview of heat pipe based solar collectors (HP-SCs), summarizing their classification, performance evaluation and optimization, and effective improvements. It discusses the common features and relationships between HP-STCs and HP-PV/T technology. The paper concludes with remarks on application situations, performance analysis and comparison, and identifies new research directions and potentials in this field.
Article
Thermodynamics
Y. Qu, S. Qiao, D. Zhou
Summary: The steady-state heat transfer model of the asymmetric dual-evaporator loop heat pipe (DE-LHP) reveals that the operating temperature is influenced by the position of the compensation chambers (CCs) and the heat load distribution between the two evaporators. Different domination zones, such as position domination zone and heat load distribution domination zone, are observed when analyzing the heat sharing characteristics and influence of heat sink and ambient temperature on operating temperature. Operating temperature reaches a minimum when heat loads applied to the two evaporators are equal.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Bhaskar Ranjan Tamuli, Sujit Nath, Dipankar Bhanja
Summary: This study focuses on the application of advanced micro heat pipe array technology in solar water heaters. A numerical simulation is conducted to assess the performance of a specific evacuated tube solar water heater with micro heat pipe arrays, considering the seasonal variation of solar radiation in Silchar, Northeast India. The results show that while the efficiency is low in the morning, it stabilizes at around 70-80% for most of the day. By incorporating a double micro heat pipe array design, the efficiency of the water heater can be enhanced by 15-20%.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
M. Genovese, F. Piraino, P. Fragiacomo
Summary: This research proposes the concept of a hydrogen valley in southern Italy, where hydrogen is produced centrally and delivered via fuel cell hybrid trains to refueling stations, providing transportation services. The analysis from both technical and economic perspectives shows that the cost of hydrogen and energy efficiency reached competitive levels, and hydrogen rail transport offers significant benefits in terms of emissions reduction and economic gains compared to conventional diesel trains and fully electric trains.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Miaomiao Liu, Payam Nejat, Pinlu Cao, Carlos Jimenez-Bescos, John Kaiser Calautit
Summary: This article provides a critical review of the performance of windcatchers, pointing out the current research gaps and issues, and proposing directions for further investigation and market prospects.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Solomon Boadu, Ebenezer Otoo
Summary: Despite Africa's vast energy resources, including wind energy, the continent faces challenges in developing its wind energy industry. Northern African countries and South Africa currently dominate the wind energy sector in Africa. To uplift Africa's socio-economic status, strong political will, supportive policies, and institutional frameworks are needed to drive the development of wind energy and overcome existing challenges.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
E. K. Grubbs, S. M. Gruss, V. Z. Schull, M. J. Gosney, M. V. Mickelbart, S. Brouder, M. W. Gitau, P. Bermel, M. R. Tuinstra, R. Agrawal
Summary: As the global population grows, the demand for food, energy, and water will increase significantly. However, limited land availability and competition for solar resources pose challenges to resource generation technologies. In the United States, both agriculture and solar energy production have adopted densification schemes to improve yields and energy output per unit of land. This research proposes an Agrivoltaic food and energy coproduction architecture that optimizes power generation while maintaining crop productivity by implementing ideal anti-tracking during critical growth periods. This technology offers a viable pathway for widespread solar implementation throughout the contiguous United States.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Han Shao, Rui Henriques, Hugo Morais, Elisabetta Tedeschi
Summary: The integration of offshore wind energy into the electric grid provides opportunities in terms of environmental sustainability and cost efficiency, but poses challenges to power quality. This survey offers a deeper understanding of disturbance detection and classification tools, exploring root causes, disturbance locations, and algorithmic solutions. It highlights synchronized waveform measurement and discusses evaluation metrics for detection and classification algorithms. Additionally, a novel system-wide monitoring framework is proposed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Eleni Davidson, Yair Schwartz, Joe Williams, Dejan Mumovic
Summary: A continued upward trend in global greenhouse gas emissions poses risks to global infrastructure and built assets. Maintaining high indoor environmental quality standards is a challenge for higher education institutions under future climates. Passive cooling mechanisms may be insufficient to tolerate predicted temperature increases. Different building typologies have varying energy demand projections.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
Kexin Pang, Jian Zhou, Stamatis Tsianikas, David W. Coit, Yizhong Ma
Summary: This study proposes a new framework for long-term microgrid expansion planning, using deep reinforcement learning method to consider various uncertainties and constraints. The framework aims to enhance the effectiveness of microgrid expansion planning from the perspectives of economy, resilience, and greenhouse gas emission reduction.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
Jun Zhao, Kangyin Dong, Xiucheng Dong
Summary: The continuous growth of global electricity penetration has provided modern energy for alleviating energy poverty, but its impact on carbon neutrality has been overlooked. The research reveals that clean electricity from traditional fossil energy and renewable energy has a positive influence on the greenhouse effect. Eradicating energy poverty can effectively alleviate the greenhouse effect, especially in non-Belt and Road Initiative (B&RI) nations.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Hossein Shahbeik, Hamed Kazemi Shariat Panahi, Mona Dehhaghi, Gilles J. Guillemin, Alireza Fallahi, Homa Hosseinzadeh-Bandbafha, Hamid Amiri, Mohammad Rehan, Deepak Raikwar, Hannes Latine, Bruno Pandalone, Benyamin Khoshnevisan, Christian Sonne, Luigi Vaccaro, Abdul-Sattar Nizami, Vijai Kumar Gupta, Su Shiung Lam, Junting Pan, Rafael Luque, Bert Sels, Wanxi Peng, Meisam Tabatabaei, Mortaza Aghbashlo
Summary: This review explores the production of biocrude oil from biomass feedstocks through the process of hydrothermal liquefaction (HTL). It discusses the impact of process parameters on the quality, quantity, cost, and environmental impacts of biofuels. The review also highlights the challenges and prospects for the future development of biocrude oil.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
Meysam Majidi Nezhad, Mehdi Neshat, Georgios Sylaios, Davide Astiaso Garcia
Summary: Digital twins promise innovation for the marine renewable energy sector by using modern technological advances and the existing maritime knowledge frameworks. This research presents critical aspects of digital twin implementation challenges in marine energy digitalization approaches that use and combine data systems.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
Yeganeh Sharifian, Hamdi Abdi
Summary: This paper discusses the background and objectives of the multi-area economic dispatch problem, as well as various techniques and methods applied in this field. It also covers comprehensive formulations of the problem and important issues in the field of probabilistic MAED, along with some related concepts and suggestions.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
J. G. B. Churchill, V. B. Borugadda, A. K. Dalai
Summary: The increasing global energy demand and the need to reduce fossil fuel reliance have created a demand for renewable and sustainable fuel sources. This review explores the potential of tall oil, a by-product of the pulping industry, as a feedstock for biofuels. The review provides an overview of tall oil production, purification, and treatment, and investigates recent trends and barriers towards tall oil-derived biofuels.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
David C. Broadstock, Xiangnan Wang
Summary: This study provides a general review of research on district cooling, identifying key topics and themes and highlighting potential research priorities for future studies.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Green & Sustainable Science & Technology
L. Scharnhorst, D. Sloot, N. Lehmann, A. Ardone, W. Fichtner
Summary: This study investigates and analyzes the barriers to demand response in industrial and commercial sectors, highlighting their significance. Concerns about diminished product quality, disruptions to production processes, human resource management, and revenue uncertainty are identified as the most frequently cited barriers. Overcoming these barriers requires bridging knowledge gaps, allocating sufficient resources, and adapting external incentives and policies.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Review
Green & Sustainable Science & Technology
Tong Feng, Yuechi Sun, Yating Shi, Jie Ma, Chunmei Feng, Zhenni Chen
Summary: Air pollution is a significant global challenge, and policymakers have implemented policies to reduce it. Evaluating the effectiveness of these policies is critical, and our study reveals trends and gaps in air pollution policy research. We found that research has shifted from focusing solely on air pollutants to including methodologies, policies, and health implications. China has emerged as a major contributor in this field of research.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)