Article
Thermodynamics
Balaga Ravikiran, Koona Ramji, Tunuguntla Subrahmanyam
Summary: This study investigates the thermal performance of a combination of twisted tapes, perforated twisted tapes, and wire coils in a circular tube with water as the working fluid under turbulent flow conditions. The results show that these combined effects can significantly enhance the convective heat transfer coefficient and friction factor by mechanisms such as reversed flow, swirling flow, and impinging flow, ultimately improving the thermal performance of the circular tube.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
H. Harish, K. Manjunath
Summary: This research compares the flow and heat transfer properties of water with circular protruded twisted-tape inserts to those with traditional twisted tapes. The study found that circular protruded twisted-tape inserts provide higher thermal enhancement and lower friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Review
Engineering, Mechanical
Sashank Thapa, Sushant Samir, Khushmeet Kumar
Summary: Concentrating solar collectors like parabolic troughs have proven to be efficient in heat transfer using passive techniques, but also increasing pumping power requirements. Researchers are working to find optimum performance conditions for parabolic trough receivers by using different types of inserts in flow paths.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Yongfeng Ju, Tiezhu Zhu, Ramin Mashayekhi, Hayder Mohammed, Afrasyab Khan, Pouyan Talebizadehsardari, Wahiba Yaici
Summary: Increasing the number of semi-twisted tapes in a heat exchanger pipe leads to enhancement in heat transfer and friction factor, which is significant for heat exchange using nanofluids.
Article
Thermodynamics
Kim Leong Liaw, Jundika C. Kurnia, Agus P. Sasmito
Summary: This study investigates the convective heat transfer performance of Newtonian fluid in a helical twisted multilobe tube using computational fluid dynamics (CFD) simulations. The results show that the combination of number of lobes and tube twisting has a significant effect on the heat transfer coefficient, while increasing the number of lobes alone has a minimal impact. The helical coiled tube outperforms the straight tube within a certain range of Reynolds numbers, while twisting is recommended primarily for straight tubes.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Sanjay Kumar Singh, Arvind Kumar
Summary: The experimental study investigated heat transfer and friction factor analysis of water flowing in a double pipe heat exchanger with dimpled twisted tape inserts. Results showed that a significant enhancement in heat transfer efficiency can be achieved with different dimple sizes, with the best performance observed for a dimple diameter of 5 mm and a diameter-to-depth ratio of 3.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Review
Multidisciplinary Sciences
Rohit Khargotra, Raj Kumar, Rahul Nadda, Sunil Dhingra, Tabish Alam, Dan Dobrota, Anca Lucia Chicea, Kovacs Andras, Tej Singh
Summary: Heat transfer in water using solar energy is an effective way to utilize renewable energy and reduce dependence on non-renewable sources. Utilizing turbulent promoters is an efficient solution to enhance heat exchanger performance. This review summarizes experimental and numerical studies on heat exchangers, including thermal examinations and fluid flow characteristics with different turbulent promoters and tube arrangements. It also compares the thermal performance of twisted tape configurations in heat exchanger tubes using correlations developed by different researchers.
Article
Thermodynamics
Anil Kumar, Masood Ashraf Ali, Rajesh Maithani, Naveen Kumar Gupta, Sachin Sharma, Sunil Kumar, Lohit Sharma, Robin Thakur, Tabish Alam, Dan Dobrota, Sayed M. Eldin
Summary: This research paper presents an experimental analysis on a heat exchanger tube using a newly designed perforated conical ring combined with twisted tape as inserts. The investigation analyzes various geometric and flow parameters and establishes empirical correlations for the Nusselt number and the friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mohammadreza Niknejadi, Masoud Afrand, Arash Karimipour, Amin Shahsavar, Amir Homayoon Meghdadi Isfahani
Summary: This experimental investigation focuses on analyzing the laminar forced convection of water-based nanofluid (NF) containing Fe3O4 nanoparticles inside a twisted tube. The study examines the impacts of NF concentration, Reynolds number, and twist pitch on the average Nusselt number, friction factor, and overall hydrothermal performance indicator. The results show that the overall hydrothermal performance of NF in the twisted tube is superior to that of water in the plain tube, with the best performance occurring at NF concentration of 2% and twist pitch of 10 mm.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Mechanical
Hamid Nasirzadeh, Mohammad Eftekhari Yazdi, Arash Mirabdolah Lavasani
Summary: Different jet configurations were tested to reduce the surface temperature of a constant heat flux plate. The study found that the simultaneous use of two swirling jets achieved both increased overall Nusselt number and decreased maximum temperature on the hot surface.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Thermodynamics
Sumit Kr. Singh, Jahar Sarkar
Summary: Experimental studies show that the use of hybrid nanofluid and different shapes of twisted tape inserts can improve heat transfer and pressure drop characteristics, with Nusselt number and friction factor increasing with decreasing twisting ratio, increasing depth ratio, decreasing width ratio, and decreasing nanofluid inlet temperature.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Hakan Bucak, Fuat Yilmaz
Summary: The study examined the thermal-hydraulic performance of twisted tapes with teardrop-shaped dimple-protrusion patterned walls, finding that certain designs had higher Nusselt number and thermal performance factor within specific Reynolds number ranges.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Review
Green & Sustainable Science & Technology
Younus Hamoudi Assaf, Abdulrazzak Akroot, Hasanain A. Abdul Wahhab, Wadah Talal, Mothana Bdaiwi, Mohammed Y. Nawaf
Summary: Research focuses on improving the thermal conductivity of heat exchangers by using different strategies such as inserting tapes and rings of various shapes, as well as transforming fluids into nanoliquids with nanomaterials. Factors such as torsion tape ratio, ring spacing, and flow direction impact heat transfer efficiency.
Article
Thermodynamics
Yash M. Patel, Sanjay Jain, Vikas J. Lakhera
Summary: A novel type of discrete reverse NACA 0040 profile ribs were used to enhance the performance of the solar air heater in this study, with optimized parameters resulting in the maximum thermo-hydraulic performance parameter. Empirical correlations were developed to predict Nusselt number and the friction factor, showing deviations within +/- 6% of the corresponding numerical values.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Salman Al Zahrani, Mohammad S. Islam, Suvash C. Saha
Summary: This study aims to enhance the thermal performance of the basic plate heat exchanger (FPHE) by proposing a new flow arrangement. Computational fluid dynamics simulations show that the modified FPHE has significantly higher Nusselt number and friction factor compared to the basic FPHE.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
Paramvir Singh, S. R. Chauhan, Varun Goel, Ashwani K. Gupta
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Energy & Fuels
Paramvir Singh, S. R. Chauhan, Varun Goel, Ashwani K. Gupta
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Energy & Fuels
Paramvir Singh, S. R. Chauhan, Varun Goel, Ashwani K. Gupta
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Thermodynamics
Rajneesh Kumar, Varun Goel, Anoop Kumar
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2020)
Article
Energy & Fuels
Rajneesh Kumar, Abhishek Singh Kashyap, Paramvir Singh, Varun Goel, Khushmeet Kumar
JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Energy & Fuels
Rajneesh Kumar, Varun Goel, Paramvir Singh, Abhishek Saxena, Abhishek Singh Kashyap, Amit Rai
JOURNAL OF ENERGY STORAGE
(2019)
Article
Engineering, Mechanical
Rajneesh Kumar, Varun Goel, Mukesh Kumar
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2020)
Review
Green & Sustainable Science & Technology
Himanshu Nautiyal, Varun Goel
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Thermodynamics
Harshdeep Sharma, Varun Goel
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2020)
Article
Thermodynamics
Rajneesh Kumar, Varun Goel, Suvanjan Bhattacharyya, V. V. Tyagi, Abdullah M. Abusorrah
Summary: The performance of a solar air heater can be significantly improved by introducing artificial-roughness over the heat-collector plate. The study conducted provides correlations for Nusselt number and friction factor based on experimental data, showing good agreement with the developed mathematical expressions.
EXPERIMENTAL HEAT TRANSFER
(2022)
Article
Energy & Fuels
Sudhir Kumar Pathak, Ashish Nayyar, Varun Goel
Summary: Research shows that diesel engines can partially replace compressed natural gas to reduce NOx and smoke emissions; in dual fuel mode, the highest reduction rates for NOx and smoke can reach 21% and 18% respectively.
Article
Green & Sustainable Science & Technology
Rajneesh Kumar, Varun Goel
Summary: The study investigates the influence of various roughness elements on the performance of solar air heater, with experiments conducted in a triangular passage solar air heater. Results show that among different geometries, the forward-chamfered rectangular rib has the best thermohydraulic performance parameter.
Article
Green & Sustainable Science & Technology
Varun Goel, Rajneesh Kumar, Suvanjan Bhattacharyya, V. V. Tyagi, Abdullah M. Abusorrah
Summary: This study investigated the impact of using hemispherical dimple-cavities on the flow dynamics in a solar air heater, showing significant changes in Nusselt number and friction factor. The best heat transfer augmentation was observed at the trailing edge, with higher heat transfer efficiency compared to the leading edge. A close fit curve was obtained between the developed correlation and experimental values, with maximum errors of 6.61% and 7.03%, respectively.
Article
Green & Sustainable Science & Technology
Suvanjan Bhattacharyya, Debraj Sarkar, Rahul Roy, Shramona Chakraborty, Varun Goel, Eydhah Almatrafi
Summary: In this study, the heat transfer and thermal performance of solar air-heater tubes with helical corrugation were predicted using a machine learning regression technique. A statistical analysis of heat transfer was conducted by developing an artificial neural network-based machine learning model, which showed high prediction accuracies. The models based on experimental data features provide accurate estimation of experimental output, reducing the time and cost of experiments.
Article
Thermodynamics
Sunil Kumar, Rajneesh Kumar, Varun Goel, Suvanjan Bhattacharyya, Alibek Issakhov
Summary: This study investigates the impact of different roughness geometries on the exergetic efficiency of a solar air heater (SAH), finding that the exergetic efficiency of a semicircular ribbed SAH is 26% higher than that of square roughness. Recommendations are made based on the design plots developed to enhance the efficiency of the SAH.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
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)
