Article
Construction & Building Technology
Shuang Tao, Qizhong Wan, Ying Xu, Dongshan Gao, Zhenggang Fang, Yaru Ni, Liang Fang, Chunhua Lu, Zhongzi Xu
Summary: In this work, a dynamic radiative cooling material combining selective super-hydrophobic radiative cooling emitter (SRCE) and phase change material (PCM) was proposed. Outdoor measurements showed that PCM@NF@SRCE achieved better sub-ambient cooling under hot weather while maintaining higher temperature in cold weather. Energy-saving simulations confirmed the energy-saving performance of PCM@NF@SRCE in both hot and cold weather. The integration of PCM and SRCE shows promising application in various climates.
ENERGY AND BUILDINGS
(2023)
Article
Energy & Fuels
Someshwar S. Bhakre, Pravin D. Sawarkar, Vilas R. Kalamkar
Summary: The study explores the use of PEG 1500 as a phase change material to reduce the temperature of solar photovoltaic panels and improve electrical conversion efficiency. The experiments demonstrate that both PCM and PCM metal matrix systems can effectively decrease the panel temperature and enhance power generation efficiency under different conditions.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Xu Qiao, Xiangfei Kong, Lu Wang
Summary: A thermal enhanced form-stable composite phase change material was prepared in this study, using aluminum nitride to improve the thermal conductivity of pure phase change material significantly. Experimental results showed that the composite possessed good thermal conductivity and high utilization rate of phase change material, indicating a promising future.
APPLIED THERMAL ENGINEERING
(2021)
Review
Energy & Fuels
Someshwar S. Bhakre, Pravin D. Sawarkar, Vilas R. Kalamkar
Summary: The study showed that front surface cooling can significantly reduce the temperature of photovoltaic panels and increase optical efficiency, while the use of water spraying cooling system can reduce the temperature of PV panels by 5-6 degrees Celsius. The photovoltaic thermal absorber collector system is the most economically viable system for electrical and thermal energy generation, and evaporative cooling using clay and cotton wick structure could be an effective solution for standalone PV systems.
Article
Construction & Building Technology
Xiaobin Gu, Lihua Peng, Peng Liu, Liang Bian, Boxuan Wei
Summary: Phase change material (PCM) with large thermal storage capacity and constant phase change temperature is a promising material for building energy saving. This study utilizes acid-modified halloysite to encapsulate PCM and investigates the thermal conductivity enhancement on the thermal performance of FSPCM cement panel. The results showed that the acid-modified FSPCM had high thermal storage capacity and appropriate phase change temperature.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Abdelhakim Hassabou, Rima J. Isaifan
Summary: This study addresses the challenges of using photovoltaic solar systems in hot arid regions and proposes a solution using Phase Change Materials (PCM) for passive cooling. The PCM-Matrix Absorbers (PCM-MA) are modeled using the apparent heat capacity formulation and volume averaging technique, and the results are validated against an analytical solution. The findings can be used to optimize PCM-MA for specific geographical locations and other applications.
Article
Green & Sustainable Science & Technology
Fahad Al-Amri, Farooq Saeed, Muhammad Abdul Mujeebu
Summary: One of the major challenges in the PV industry is to effectively cool the PV panel during its operation. This study introduces a dual-function PV panel racking structure that acts as both a mechanical support and a heat sink. Numerical analysis and field experiments validate that the modified structure can reduce panel temperature and increase panel efficiency, resulting in a lower levelized cost of electricity.
Article
Materials Science, Composites
Chengbin Yu, Young Seok Song
Summary: A NTC thermistor with thermal sensing and control capabilities was manufactured using form stable phase change materials (PCMs). The incorporation of PCMs expanded the potential uses of the thermistor by providing a stable and continuous circuit. To prevent leakage, a graphene aerogel was employed as a supporting material. The PCM composite exhibited excellent thermal stability and could maintain the output current in the circuit, making it suitable for thermal controllable systems.
COMPOSITES COMMUNICATIONS
(2023)
Article
Thermodynamics
Ali Yousefi, Waiching Tang, Mehrnoush Khavarian, Cheng Fang
Summary: This study developed a novel form-stable PCM cement composite and investigated the effects of two thermal conductive fillers on its thermal performance. The results showed that the composite had good thermal stability and improved heat transfer rate, leading to a significant reduction in indoor temperature.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Suhil M. Kiwan, Ali M. Khlefat
Summary: An effective photovoltaic thermal regulation technique using porous material confined at the backside of the panel is proposed in this study. Numerical thermal analysis and simulation studied the influence of different parameters on the conversion efficiency of the PV module, showing that increasing the porous fins and porous layer can enhance efficiency and reduce friction. Additionally, increasing the emissivity of the duct base wall can enhance the cooling effect.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Xiang Yun Debbie Soo, Zhuang Mao Png, Xizu Wang, Ming Hui Chua, Pin Jin Ong, Suxi Wang, Zibiao Li, Dongzhi Chi, Jianwei Xu, Xian Jun Loh, Qiang Zhu
Summary: This study successfully developed a fast-curing and coatable polyethylene-glycol (PEG)-based phase change material (PCM) for thermal regulation and waste heat energy harvesting in the electronics industry. The PCM exhibited form stability and thermal stability, making it suitable for coating and complex 3D printing on irregular surfaces.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Thermodynamics
Mohammed Alktranee, Peter Bencs
Summary: Comparing passive cooling with cotton wicks integrated with rectangular aluminium fins (CWIRAFs) submerged in water and active cooling methods using an absorbing plate and copper pipes attached at the PV module backside, the research found that CWIRAFs performed better in terms of evaporative cooling and increased heat dissipation area. Without cooling, PV modules experience significant performance degradation in hot climate conditions. The use of CWIRAFs reduced the temperature by 31.4%, increased power by 66.6%, and improved electrical efficiency from 3.12% to 8.6%. Active cooling methods reduced PV temperature by 20.8%, increased power by 56.7%, and enhanced electrical efficiency by 7.9%. Removing excess heat from the backside of the PV module through circulating water improved the thermal efficiency and overall efficiency of the PVT system by about 26.3% and 34.2%, respectively.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Energy & Fuels
Akshayveer Akshayvee, Amit Kumar, Ajeet Pratap Singh, O. P. Singh
Summary: This study investigates a new design concept for photovoltaic panels with an attached overhead phase change material (PCM) enclosure, which enhances solar radiation utilization and increases energy storage density. With this design, the electrical conversion efficiency of photovoltaic panels can reach approximately 12%.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Construction & Building Technology
Amin Shahsavar, Ighball Baniasad Askari, Amir Roohbakhsh Meyary Dovom
Summary: This study numerically investigates the use of phase change material (PCM) as a coolant in air-type photovoltaic thermal (PVT) systems. The results show that PCM cooling decreases the PV temperature, increases the PVT output air temperature, and allows for the production of useful thermal and electrical energy in cold months.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
V. V. Tyagi, K. Chopra, B. Kalidasan, Aditya Chauhan, U. Stritih, Sanjeev Anand, A. K. Pandey, Ahmet Sari, Richa Kothari
Summary: This paper discusses the significant role of thermal energy storage in building energy performance, combining thermal properties of PCM materials and their applications in energy efficient buildings. The article summarizes the advancements, applications, and future solutions in thermal energy storage technologies, with a focus on PCM composites, control strategies, and PCM-based PV/T systems.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Metallurgy & Metallurgical Engineering
Sirisha Bhadrakali Ainapurapu, Venkata Anantha Ramasastry Devulapalli, Ram Prabhu Theagarajan, Bharat Kumar Chigilipalli, Ravi Kumar Kottala, Muralimohan Cheepu
Summary: The manufacturing of stainless steel components is important and challenging for various industrial sectors. Hot forging and precision machining are necessary for producing high-performance and high-production stainless steel components. While 3D printing/additive manufacturing can create near-net-shape components, it is time-consuming and costly for large-scale parts. Therefore, combining forging operations and additive manufacturing offers many advantages by creating a hybrid-manufacturing route. This study combined hot forged SS304L with wire arc additive manufacturing deposits of SS308L to create bimetallic parts. By using different modes of pulse and spray MIG-based WAAM for deposition, excellent mechanical properties were achieved in the interface and deposited wall. The microstructures and mechanical properties of the forged and deposited components were similar to those of conventionally processed stainless steel, indicating that hybrid-manufacturing technologies can achieve the required mechanical properties. Based on the microstructural and mechanical properties, the pulse deposition mode showed good results in the hybrid-manufacturing technology. The combination of forging and additive manufacturing can enhance material properties and increase flexibility for fabricating components compared to traditional forging techniques.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Chemistry, Physical
Balasubramanian Karuppudayar Ramaraj, Ravi Kumar Kottala
Summary: The primary purpose of this study is to develop a novel composite phase change material for medium temperature thermal energy storage systems. The proposed material consists of a binary eutectic PCM, a supporting material, and thermal conductivity-improving particles. The addition of activated biochar and multiwalled carbon nanotubes increases the thermal conductivity and stability of the eutectic chloride.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Shankar Rengarajan, Balasubramanian Karuppudayar Ramaraj, Sivapirakasam Suthangathan Paramashivan, Senthilkumar Velusamy
Summary: The oxidation behavior of microstructured and near nanostructured Cr3C2-Ni-Cr-B-Si coated superalloy has been studied, with the near nanostructured coating showing better oxidation resistance than the microstructured one.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2023)
Article
Thermodynamics
B. S. Jinshah, K. R. Balasubramanian, Kottala Ravikumar, S. Divakar
Summary: Solar energy for industrial processes is not widely used, but this study proposes a new dual-mode Parabolic Trough Collector based on an Open Natural Circulation Loop. The system is evaluated for its suitability in providing hot water/low enthalpy steam for process heating applications, especially in rural areas. Experimental assessments, economic analysis, and environmental impact are conducted, showing the system's potential in efficiency, cost-effectiveness, and emission reduction.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
R. John Peter, K. R. Balasubramanian, K. Ravi Kumar
Summary: This study investigates the thermo-hydraulic performance of microencapsulated phase change material slurry (MPCMS) in different rectangular microchannel configurations. The experimental results demonstrate that MPCMS improves the heat transfer rate, particularly in zigzag microchannels with low titanium encapsulation.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
K. R. Balasubramanian, R. John Peter, B. S. Jinshah
Summary: This study investigates the thermal performance of micro-encapsulated paraffin slurry in different shapes and combinations of microchannel heat sinks. The experimental results show that the low concentration micro-encapsulated phase change slurry exhibits higher heat transfer performance than de-ionized water in all configurations.
HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Ravi Kumar Kottala, Bharat Kumar Chigilipalli, Srinivasnaik Mukuloth, Ragavanantham Shanmugam, Venkata Charan Kantumuchu, Sirisha Bhadrakali Ainapurapu, Muralimohan Cheepu
Summary: Thermogravimetric analysis (TGA) was used to compare the thermal stability of pure phase change material (D-mannitol) and nano-enhanced PCM (NEPCM) containing multiwalled carbon nanotubes (MWCNT). Kinetics of degradation were analyzed using Kissinger-Akahira-Sunose (KAS), Flynn-Wall-Ozawa (FWO), and Starink models. Activation energies for pure PCM ranged from 66.53-79.36 kJ/mol, while NEPCM (1% MWCNT) had activation energies ranging from 52.28-76.59 kJ/mol. Machine learning models accurately predicted the degradation of NEPCM samples using input parameters such as nanoparticles weight fraction, heating rate, and temperature.
Article
Thermodynamics
Ravi Kumar Kottala, K. R. Balasubramanian, B. S. Jinshah, S. Divakar, Bharat Kumar Chigilipalli
Summary: This research evaluates the performance of a novel parabolic trough collector (PTC) with a naturally circulated open loop under different classes of solar radiation data. The use of phase change material (PCM) in the receiver tubes improves the overall thermal efficiency compared to bare tubes. Additionally, machine learning models, particularly the Gaussian process regression (GPR) model, can accurately predict the instantaneous thermal efficiency of the developed system under different solar radiation classes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Materials Science, Multidisciplinary
G. Pramod Kumar, K. R. Balasubramanian, K. V. Phani Prabhakar, Muralimohan Cheepu
Summary: In this study, laser-MIG hybrid welding was used to weld 10mm thick Inconel 617 plates, and the welds were analyzed for microstructure, mechanical, and corrosion properties. The microstructure of the weld zone consisted of cellular crystals with dendrites and equiaxed sub-grains. XRD analysis revealed dominant gamma and gamma prime phases, as well as minor carbide peaks. The base metal had lower hardness and higher impact energy compared to the weld joints. The weld joints exhibited good bend ductility and an increase in wire feed rates resulted in increased corrosion rate.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Chemistry, Physical
G. Pramod Kumar, K. R. Balasubramanian, Muralimohan Cheepu, Ravi kumar Kottala
Summary: This study investigated the effect of CMT-GMAW multi-control welding on the microstructure, hardness, and electrochemical properties of Inconel 617 alloy. The results showed that increasing the wire feed rate led to a decrease in microhardness and an increase in corrosion rate. This was attributed to increased carbide precipitation and segregation, resulting in poorer corrosion resistance compared to the base metal.
SURFACE REVIEW AND LETTERS
(2023)
Article
Engineering, Manufacturing
Divakar Senthilvel, K. R. Balasubramanian, B. S. Jinshah
Summary: This research article explores the impact of printing layer thickness and infill percentage on the water intake ability and mechanical properties of 3D printed PLA parts. The results show that increasing infill percentage and reducing layer thickness can improve the bending and tensile properties of the parts. Additionally, an adaptive model between the input parameters and mechanical properties is developed using ANFIS and ANN-TLBO methods.
INTERNATIONAL JOURNAL OF INTERACTIVE DESIGN AND MANUFACTURING - IJIDEM
(2023)
