Recent Patents on Mechanical Engineering - Online First
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Comparative Experimental Investigation to Analyze the Use of SiO2 Nanoparticles with R600a and Pure R600a in Vapour Compression Refrigeration System
Authors: Md Ahsan, Prabha Chand and Kumari NamrataAvailable online: 11 March 2025More LessIntroductionGlobal refrigeration equipment usage contributes significantly to climate change. Research on improving refrigeration system efficiency has been conducted, while there is a worldwide debate on climate change. Patents have deployed nanoparticles in various refrigeration systems by mixing them with conventional refrigerants, demonstrating their exceptional thermal and heat-transfer properties.
MethodsThis study assessed the comparative performance of refrigeration systems using nanoparticles of SiO2 with traditional R600a refrigerant. The result of using nanorefrigerants in the experimental settings of the refrigeration process, including temperature and pressure, as well as their capacity to transfer heat, was evaluated based on published research. Using pure R600a refrigerant as the base fluid, an experimental investigation was conducted to determine the characteristics of the refrigeration unit.
ResultsThe heat transfer of the refrigerant limit served as the foundation for the presentation of the refrigeration framework. Using R600a as a refrigerant, the data comparison revealed that nanorefrigerants perform better in terms of heat conductivity and heat transfer coefficients than base refrigerants. Furthermore, nanorefrigerant refrigeration systems demonstrated a much higher coefficient of performance (COP).
ConclusionThe goal of the test was to confirm that the refrigeration system using nanorefrigerants functions as expected. The results showed that mixing R600a refrigerant with silicon dioxide nanoparticles raised the freezing point and decreased force utilisation by 3%. As a result, refrigeration systems can use silicon dioxide nanoparticles.
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Research on Pole-climbing Robots that Can Perform Multi-degree-of-freedom Motion and Working at the Top of Distribution Network Poles
Authors: Yu Feng, Shaolei Wu, Kai Wu, Feng Guo, Chunjie Wei and Wei WangAvailable online: 27 January 2025More LessBackgroundIn order to complete power maintenance, equipment renewal and other loss reduction work and reduce customer outage time at the same time, live electrical work has become a necessary means. Pole-climbing robots, as an important auxiliary tool for power-carrying operations, frequently appear in papers and patents.
ObjectiveThe pole climbing robot is designed to work at any position in the working space with electric distribution pole, effectively and safely replacing manual work.
MethodsBased on the physical parameters of the cement utility pole and the range of space for live electrical work, the functional relationships are established between the structural parameters of the robot and the kinematic and dynamical models, and the optimal range of parameters is solved.
ResultsThe robot can rotate and climb around the pole with five steering angles: 0°, 22.5°, 45°, 67.5° and 90°. The control insulated operating rod can transport special tools to any station within 1m radius of the distribution pole for live work. It has a maximum load of 11kg and a maximum climbing speed of 33.6mm/s.
ConclusionThe pole-climbing robot can climb cement utility pole, manipulate the insulated operating lever it carries, and transport special tools to the workstation on the cable for carrying out live electrical work.
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Performance Analysis of IoT-based Temperature Monitoring Box Type Solar Cooker: A Multi-objective Optimization Approach
Available online: 30 December 2024More LessBackgroundThe idea behind the Internet of Things is to bring the virtual world into the physical one by connecting commonplace items. With the help of the Internet of Things (IoT), it is possible to remotely sense or control objects through preexisting network infrastructure. This opens up possibilities for computer-based systems to integrate with the physical world, which in turn improves efficiency, accuracy, and economic benefit while reducing the need for human intervention.
ObjectiveThe purpose of this patent study is to investigate how a (NSGA-II) multi-objective genetic algorithm might be utilized to optimize the execution of an Internet of Things (IoT) temperature monitoring Box-Type Solar Cooker (BTSC). To determine the best set of output parameters for an IoT temperature monitoring box-type solar cooker, (NSGA-II) multi-objective genetic algorithms are used to perform optimizations of the figure of merits (F2), cooking power, cooker efficiency, and final water temperature.
MethodsThe present research work involves the development of a Wi-Fi module system integrated with a smart temperature monitoring system for a BTSC. Keeping track of the temperature data from different locations in the BTSC through the IoT system was the primary objective of this project. A waterproof temperature sensor (DS18B20) was used to keep monitoring. After that, the data was shown on an LCD, stored on a microSD card, and made available through a smartphone. The Blynk Applications' IoT was employed. Using existing data, regression-based computational models are developed to describe the complex correlations between the decision-processing parameters and the input parameters of an IOT-based solar cooker. These models are applied in the objective functions after determining that a genetic algorithm is more appropriate for the problem. To forecast the optimal values about the figure of merits (F2), cooking power, cooker efficiency, and final water temperature, the Pareto fronts have been developed.
ResultsWe compare the values of response variables that were gathered experimentally with the values that were predicted by NSGA-II. The predicted values are found to be quite close to experimental values. This indicates that the multi-objective optimization method, as used in this study, has very good prediction performance. The test results are graphically shown using the error bar. Therefore, it is clear that the optimization process used to adjust the parameters of the solar cooker's performance has been quite effective. According to the findings of the experiment, the temperature at which a cooking pot remained stagnant on average was 158°C. It was determined that the cooker was of class A based on the values of the first figure of merit (F1), the second figure of merit (F2), and the cooking power (P), which were respectively 0.132, 0.359, and 86.108 W. Therefore, the thermal efficiency of the IoT-base temperature monitoring box type solar cooker is 39.99%.
ConclusionThe findings of this inquiry furthermore produced the outcome that the model provided can be applied conveniently with a confidence level of 95% to calculate the figure of merits (F2), cooking power, cooker efficiency, and final water temperature value of an Internet of Things-based temperature monitoring BTSC. The performance of IoT-based BTSC is optimized by providing real-time monitoring and data visualization, ultimately improving their efficiency and reliability. This research provides an educational tool to promote awareness and understanding of renewable energy sources and their potential benefits.
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