Article
Thermodynamics
Masoud Behzad, Benjamin Herrmann, Williams R. Calderon-Munoz, Jose M. Cardemil, Rodrigo Barraza
Summary: This study proposes a proper design for volumetric air receivers used for heat and/or power generation to ensure efficient heat transfer and avoid system failure due to thermal stress. The research applies design and modeling processes to both the absorber and its holder, leading to promising findings for operating the system at the desired airflow temperature. The study also conducted steady-state heat transfer in the explicit model to calibrate the initial steady-state of the continuum model and identified regions with high temperatures and high-stress values.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Energy & Fuels
Sonika Sharma, Prabal Talukdar
Summary: This study investigates the thermal and mechanical performance of a typical porous Silicon Carbide volumetric receiver with foam structure using a coupled thermo-mechanical model. It analyzes the effects of various geometric, structural, and design parameters on the absorber's performance and identifies failure-prone regions. The study concludes that higher porosities, pore sizes, and inlet velocities result in lesser thermal stresses, while the uniformity of incident radiation flux improves the absorber's performance.
Article
Thermodynamics
Sarvapriya Singh, Siddharth Suman, Santanu Mitra, Manish Kumar
Summary: In this study, the concept of using rotating cylindrical ribs as artificial roughness in a solar air heater was investigated using computational fluid dynamics. The results showed that perpendicular ribs configuration was more desirable than parallel configuration, and rotating ribs outperformed other static ribs.
APPLIED THERMAL ENGINEERING
(2024)
Article
Energy & Fuels
Chen Kang, Wang Xiao, Chen Pengfei, Wen Long
Summary: Numerical simulation study reveals that metal foam absorbers can effectively reduce pressure loss and improve overall performance index PEC.
Article
Energy & Fuels
Matt Zuzelski, Marta Laporte-Azcue, Jose Cordeiro, Sandeep Dhakal, Vahid Daghigh, Michael Keller, Hema Ramsurn, Todd Otanicar
Summary: Solar thermal power tower systems are the leading technology for generating solar electricity. The performance of these systems is limited by mechanical properties under high thermal loads, especially at the receiver where incoming flux is converted to thermal energy. This study explores the use of a microvascular carbon/carbon composite solar receiver as a new material option for high flux solar receivers. The results show that the proposed carbon/carbon composite material can achieve thermal efficiencies over 90% for microscale receiver modules and up to 85% for full-scale receivers considering realistic strain limits, flux levels, and material properties. The efficiency is influenced by factors such as the heat transfer fluid pairing, thermal conductivity of the composite, receiver architecture, and solar flux profiles.
Article
Engineering, Chemical
Xing Du, Wentao Zhao, Zhen Wang, Rong Ma, Yunlong Luo, Zhihong Wang, Qiong Sun, Heng Liang
Summary: This study proposed a novel rural water treatment system that effectively harnessed solar energy and gravitational hydropower. The system was able to effectively remove organic matter and turbidity, as well as achieve almost complete elimination of NH3-N and NO2--N. The findings suggest the possibility of sustainable operation during rural water treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Thermodynamics
Hiu Yan Mok, Nima Sedaghatizadeh, Maziar Arjomandi, Graham J. Nathan, Mehdi Jafarian
Summary: A novel molten metal helical coil (M2HC) solar receiver is introduced in this study, which heats pressurised air or other gases to high temperatures. The absorbed solar thermal heat is transferred to the pressurised air through the submerged helical coil in a molten metal bath, while the heat transfer efficiency is enhanced by injecting inert gas. This receiver demonstrates high absorption efficiency and potential application benefits.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
V. M. Maytorena, J. F. Hinojosa
Summary: This study investigates the thermal and structural performance of a solar tower system with direct steam generation tubes subjected to high non-uniform heat fluxes. Six tubes with different configurations were evaluated, and the best performing tube had fins on the frontal surface with a wall thickness of 3 mm and an adiabatic wall thickness of 5 mm.
Article
Thermodynamics
Francesco Rovense, Miguel Angel Reyes-Belmonte, Manuel Romero, Jose Gonzalez-Aguilar
Summary: This study analyzes a 150 MW, multi-tower solar-only combined cycle power plant using olivine particles as heat transfer fluid and thermal energy storage medium. Unitary 53.0 MWth solar tower was designed to meet technical constraints. Thermo-economic optimization determined optimal layouts and storage capacities.
Article
Radiology, Nuclear Medicine & Medical Imaging
Allison Shields, Kyle Williams, Mohammad Mahdi Shiraz Bhurwani, Swetadri Vasan Setlur Nagesh, Venkat Keshav Chivukula, Daniel R. Bednarek, Stephen Rudin, Jason Davies, Adnan H. Siddiqui, Ciprian N. Ionita
Summary: This study explores the use of a pathlength-correction metric to convert 3D contrast flow to projected contrast flow in order to overcome the limitations of 2D angiographic parametric imaging (API). The results show that pathlength correction significantly improves the accuracy of API parameters and provides a more accurate representation of contrast distribution within each aneurysm.
Article
Thermodynamics
V. M. Maytorena, D. A. Buentello-Montoya
Summary: Parabolic trough collectors coupled with Organic Rankine Cycles are studied parametrically with benzene under solar irradiation using Computational Fluid Dynamics software. Results show that inlet temperature does not affect fluid boiling behavior, increasing mass flow rate decreases fluid evaporation rate, and fluid evaporation rate is directly affected by solar heat flux and mass flux.
APPLIED THERMAL ENGINEERING
(2022)
Review
Food Science & Technology
Alemayehu Ambaw, Tobi Fadiji, Umezuruike Linus Opara
Summary: Mathematical models are increasingly used in agro-food research and industry to optimize preharvest and postharvest operations. Computational modeling techniques are a cost-effective alternative to expensive experiments, especially with the increasing power and affordability of computers. Once validated, models can effectively evaluate the impact of operating and design parameters.
Review
Engineering, Multidisciplinary
Sravani Vemulapalli, Santhosh Krishnan Venkata
Summary: This paper focuses on the basics of flow measurement and the characteristics of orifice flow meter, which is widely used for flow measurement. It provides a detailed analysis of the effects of orifice plate dimensions, fluid types, and other parameters on measurement. Computational Fluid Dynamics is used to validate the performance of the orifice plate and enhance the understanding of its dynamic nature.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
L. M. C. Gato, D. N. Ferreira, D. O. C. Sa
Summary: The paper presents a study on the aerodynamic design of self-rectifying biradial turbine rotors for improving efficiency and determining the most efficient specific speed range. A new rotor geometry generation method is proposed, allowing for more design flexibility. The research includes geometry parametrization and flow simulations to understand the effect of design parameters on rotor performance. The results show an increase in efficiency and improved specific speed and diameter compared to the original design.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Yadaba Mahanand, Jnana Ranjan Senapati
Summary: Providing roughness elements significantly improves the heat removal rate in solar air heater ducts. Numerical analysis shows that the maximum improvement in heat transfer is 101% compared to the base model, while the maximum frictional penalty is 2.97 times higher. The highest thermal enhancement ratio achieved is 1.46. The collected data has been used to formulate a generalized correlation for roughness and flow variables.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Nicola Bianco, Marcello Iasiello, Gerardo Maria Mauro, Luca Pagano
Summary: In this paper, numerical analysis is used to study optimized design of metal foam heat sinks, proposing a method to simultaneously maximize heat rate and minimize pumping power.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Assunta Andreozzi, Marcello Iasiello, Claudio Tucci
Summary: This study conducts a thermal analysis of a square phase change material (PCM) for solar Organic Rankine Cycle (ORC), considering different boundary conditions and showing the significant impact of natural convection effects on temperature values and stored energy.
Article
Thermodynamics
Marcello Iasiello, Mauro Mameli, Sauro Filippeschi, Nicola Bianco
Summary: This study investigates the thermal conductivity performance of phase change materials and aluminum foams under different conditions, showing good agreement between experiments and numerical simulations. The results indicate that reducing porosity significantly reduces melting time, while PPI and orientation changes have minimal effects on the melting front.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Gerardo Maria Mauro, Marcello Iasiello, Nicola Bianco, Wilson K. S. Chiu, Vincenzo Naso
Summary: This paper proposes a comprehensive optimization framework for the design of graded foam-filled channels, which can enhance thermal performance of heat sinks. The study investigates both mono- and multi-objective optimizations to find the optimal tradeoffs between heat transfer enhancement and pressure drop reduction. The results provide valuable insights and guidelines for the thermal design of graded foam-filled channels.
Article
Engineering, Chemical
Assunta Andreozzi, Luca Brunese, Marcello Iasiello, Claudio Tucci, Giuseppe Peter Vanoli
Summary: This study models the process of thermal ablation treatment for hepatocellular carcinoma tumors and proposes a new damage-controlled protocol. Numerical solutions show that the new protocol can achieve complete ablation faster and reduce tissue temperature at the tumor rim.
Article
Thermodynamics
Nicola Bianco, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro, Luigi Mongibello
Summary: Latent heat thermal storage based on phase change material (PCM) in shell-and-tube heat exchangers can reduce power consumption of air conditioning systems. By optimizing the charging/discharging time of PCM and the operating conditions of the chiller, better performance can be achieved. Experimental validation shows that the optimal solution leads to a reduction in the inlet temperature by 1.25℃ and a maximum utilization of PCM by 40% of the initial amount. Further optimization results in a shell diameter reduction of 12 cm to exploit 72% of the PCM potential.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Lorenzo Gragnaniello, Marcello Iasiello, Gerardo Maria Mauro
Summary: This study addresses the optimization of a heat sink for the thermal management of a Peltier-cell-based biomedical refrigerator. A brute-force multi-objective optimization of an impinging-flow finned heat sink is carried out to minimize thermal resistance, weight, and pressure drop. The results provide a range of optimal solutions and offer a practical tool for the optimal design of such devices to the final user.
Article
Energy & Fuels
Augusto Cavargna, Luigi Mongibello, Marcello Iasiello, Nicola Bianco
Summary: This study focuses on the simulation and implementation of a small-scale PCM-based condenser in a portable cooling system. The PCM is integrated in the condenser to absorb the heat released during condensation, eliminating the need for external heat transfer. The objective is to develop and validate a numerical model that can simulate both the refrigerant fluid and the PCM thermofluid dynamics. A commercial solver was used for the numerical model implementation, and experimental tests were conducted to validate the simulations. The results show good agreement between the numerical and experimental data.
Article
Energy & Fuels
Nicola Bianco, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro, Luigi Mongibello
Summary: Choosing the right phase change material (PCM) is crucial for the effectiveness of thermal energy storage (TES) systems. Factors such as latent heat, stability, and melting point determine the choice of PCM for a specific application. However, subcooling phenomena can affect the energy storage/release and accuracy of modeling, highlighting the importance of understanding its effects on PCM performance.
Article
Thermodynamics
Nicola Bianco, Martina Caliano, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro, Luigi Mongibello
Summary: This paper presents a numerical analysis of a hybrid latent heat thermal energy storage (LHTES) system using micro-encapsulated phase change material (MEPCM) in cylindrical modules integrated into a water tank, aiming to enhance storage efficiency and reduce energy usage of a water-chiller system.
Article
Biotechnology & Applied Microbiology
Marcello Iasiello, Assunta Andreozzi, Nicola Bianco, Kambiz Vafai
Summary: Heart arrhythmia is caused by abnormal electrical conduction through the myocardium, which can be treated with pulsed heat to avoid damage to healthy tissue or electrical issues. This study uses pulsed heat to regulate temperature fields during radiofrequency cardiac ablation. A three-dimensional model is developed for the myocardium, catheter, and blood flow. Different pulsed conditions are tested to determine if a reasonable ablation zone can be obtained without undesired temperature peaks.
BIOENGINEERING-BASEL
(2023)
Article
Thermodynamics
Abolfazl NematpourKeshteli, Marcello Iasiello, Giuseppe Langella, Nicola Bianco
Summary: This paper simulates the simultaneous harvesting and storing of solar thermal energy using a lobed double-pipe heat exchanger with Phase Change Materials. The study shows that a six-lobed surface reduces the charging and discharging time by 18.32% compared to a one-lobe one. By combining all the enhancement techniques and using the lowest investigated porosities for the foam, the charging and discharging times are reduced by 66.68% and 81.62%, respectively, compared to Case A with pure RT82, with the main contribution coming from metal foam inclusion.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Assunta Andreozzi, Pietro Asinari, Antonio Barletta, Vincenzo Bianco, Johan Augusto Bocanegra, Pedro Vayssiere Brandao, Bernardo Buonomo, Roberta Cappabianca, Michele Celli, Eliodoro Chiavazzo, Paolo De Angelis, Andrea Diani, Sauro Filippeschi, Marcello Iasiello, Oronzio Manca, Sergio Nardini, Carlo Nonino, Luisa Rossetto
Summary: In the past decade, innovative methods for the design of heating, cooling, and heat storage devices have focused on the use of nanofluids, metal foams, and phase change materials (PCMs). A network of nine Italian universities has achieved significant results by collaboratively researching and evaluating the enhancement in heat transfer and thermal performance through the combined use of these materials.
Article
Thermodynamics
Abolfazl NematpourKeshteli, Marcello Iasiello, Giuseppe Langella, Nicola Bianco
Summary: This paper presents solutions to improve the thermal performances of paraffin as a Phase Change Material (PCM) in solar flat-plate collector systems for domestic and industrial solar applications. These solutions involve using aluminum foams with high porosity, nanoparticles, and modifications to the geometry. Numerical predictions show that the addition of nanoparticles and metal foams can significantly reduce the melting and solidification time of the PCM, with metal foams playing a more important role in improving cycling times.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Biotechnology & Applied Microbiology
Andrea Cafarchio, Marcello Iasiello, Maria Chiara Brunese, Giampiero Francica, Aldo Rocca, Assunta Andreozzi
Summary: This study investigated the in vivo ablation characteristics of a microwave ablation antenna in the livers of humans with tumors. The results showed a worse correlation between ablation volume and energy delivered in vivo compared to ex vivo, likely due to the absence of perfusion.
BIOENGINEERING-BASEL
(2023)
