scholarly journals Study on a Mid-Temperature Trough Solar Collector with Multisurface Concentration

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Zhengliang Li ◽  
Mingxian Chen ◽  
Husheng Meng ◽  
Zehui Chang ◽  
Hongfei Zheng
Keyword(s):  
Solar Collector ◽  
Tracking System ◽  
Tracking Error ◽  
Weather Conditions ◽  
Multiple Reflection ◽  
Solar Concentrator ◽  
Deviation Angle ◽  
Solar Concentrators ◽  
Collecting Efficiency

A new trough solar concentrator which is composed of multiple reflection surfaces is developed in this paper. The concentrator was analyzed firstly by using optical software. The variation curves of the collecting efficiency affected by tracking error and the deviation angle were given out. It is found that the deviation tolerance for the collector tracking system is about 8 degrees when the receiver is a 90 mm flat. The trough solar concentrators were tested under real weather conditions. The experiment results indicate that, the new solar concentrator was validated to have relative good collecting efficiency, which can be more than 45 percent when it operated in more 145°C. It also has the characteristics of rdust, wind, and snow resistance and low tracking precision requirements.

Design and Fabrication of Gamma-Type Stirling Engine on Parabolic Dish of Solar Concentrator by a Compression Ratio Method

2016 ◽  
Vol 851 ◽  
pp. 383-388 ◽  
Author(s):  
Khanuengchat Saenyot ◽  
Kitsakorn Locharoenrat ◽  
Sarai Lekchaum
Keyword(s):  
Compression Ratio ◽  
Solar Collector ◽  
Total Pressure ◽  
Weather Conditions ◽  
Stirling Engine ◽  
Ratio Method ◽  
Solar Concentrator ◽  
External Work ◽  
Parabolic Dish ◽  
Solar Tracker

In this article, we have designed and fabricated the gamma-type Stirling engine based on the compression ratio technique. This engine is attached on a parabolic dish of a solar collector. The engine shows a good performance in terms of compression ratio, external work, total pressure, and engine’s speed. Our engine offers the thermal efficiency of 30.59 % so that it can reach the output mechanical power of 0.934. The temperature difference of 137 K can maintain very well for the heat collection of the solar collector even when the weather conditions are poor. Furthermore, our materials are environmentally friendly and this design is expected to be in the applications of the solar tracker in the future.

scholarly journals The Impacts of Tracking System Inaccuracy on CPV Module Power

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1278
Author(s):  
Henrik Zsiborács ◽  
Nóra Baranyai ◽  
András Vincze ◽  
Philipp Weihs ◽  
Stefan Schreier ◽  
...  
Keyword(s):  
Tracking System ◽  
Tracking Error ◽  
Weather Conditions ◽  
Cell Diameter ◽  
Tracking Accuracy ◽  
Optimal Position ◽  
Climate Conditions ◽  
Solar Tracking ◽  
Power Yield ◽  
The Difference

The accuracy and reliability of solar tracking greatly impacts the performance of concentrator photovoltaic modules (CPV). Thus, it is of utmost significance to know how deviations in tracking influence CPV module power. In this work, the positioning characteristics of CPV modules compared to the focus points were investigated. The performance of CPV modules mounted on a dual-axis tracking system was analysed as a function of their orientation and inclination. The actual experiment was carried out with CPV cells of 3 mm in diameter. By using a dual tracking system under real weather conditions, the module’s position was gradually modified until the inclination differed by 5° relative to the optimal position of the focus point of the CPV module. The difference in inclination was established by the perfect perpendicularity to the Sun’s rays. The results obtained specifically for CPV technology help determine the level of accuracy that solar tracking photovoltaic systems are required to have to keep the loss in power yield under a certain level. Moreover, this power yield loss also demonstrated that the performance insensitivity thresholds of the CPV modules did not depend on the directions of the alterations in azimuthal alignment. The novelty of the research lies in the fact that earlier, no information had been found regarding the tracking insensitivity point in CPV technologies. A further analysis was carried out to compare the yield of CPV to other, conventional photovoltaic technologies under real Central European climate conditions. It was shown that CPV needs a sun tracking accuracy of at least 0.5° in order to surpass the yield of other PV technologies. Besides providing an insight into the tracking error values of solar tracking sensors, it is believed that the results might facilitate the planning of solar tracking sensor investments as well as the economic calculations related to 3 mm cell diameter CPV system investments.

scholarly journals Soft computing and IoT based solar tracker

2021 ◽  
Vol 12 (3) ◽  
pp. 1880
Author(s):  
Kanhaiya Kumar ◽  
Lokesh Varshney ◽  
A. Ambikapathy ◽  
Vrinda Mittal ◽  
Sachin Prakash ◽  
...  
Keyword(s):  
Image Processing ◽  
Tracking System ◽  
Tracking Error ◽  
Weather Conditions ◽  
Azimuth Angle ◽  
Positioning System ◽  
Solar Tracking ◽  
Solar Tracker ◽  
Artificial Neural Network Ann ◽  
Tracking Point

<p>The significance of the solar energy is to intensify the effectiveness of the Solar Panel with the use of a primordial solar tracking system. Here we propounded a solar positioning system with the use of the global positioning system (GPS) , artificial neural network (ANN) and image processing (IP) . The azimuth angle of the sun is evaluated using GPS which provide latitude, date, longitude and time. The image processing used to find sun image through which centroid of sun is calculated and finally by comparing the centroid of sun with GPS quadrate to achieve optimum tracking point. Weather conditions and situation observed through AI decision making with the help of IP algorithms. The presented advance adaptation is analyzed and established via experimental effects which might be made available on the memory of the cloud carrier for systematization. The proposed system improve power gain by 59.21% and 10.32% compare to stable system (SS) and two-axis solar following system (TASF) respectively. The reduced tracking error of IoT based Two-axis solar following system (IoT-TASF) reduces their azimuth angle error by 0.20 degree.</p>

scholarly journals Performance Improvement of the Parabolic Trough Solar Collector Using Different Types of Fluids with Numerical Simulation

2018 ◽  
Vol 26 (6) ◽  
pp. 332-347
Author(s):  
Saad T. Hamidi ◽  
Fikrat A.K. Fattah ◽  
Mohammed S. Ghanam
Keyword(s):  
Solar Collector ◽  
Tracking System ◽  
Experimental Tests ◽  
Working Fluid ◽  
Distilled Water ◽  
Parabolic Trough ◽  
Solar Concentrators ◽  
Engineering Department ◽  
Useful Heat ◽  
Parabolic Trough Solar Collector

Solar concentrators are an important facility to utilize the solar energy. There are many kinds of solar concentrators. In this work  an experimental has been implemented to improve the thermal performance of Parabolic Trough Solar Collector (PTSC) using three different fluids as a working fluid (water, nanoparticles of  CuO  mixed with distilled water nanoparticles of   mixed with  distilled water) with concentration ratio 0.01% and mass flow rate 20Lt/hr without tracking system. The experimental tests have been carried out in electro-mechanical engineering department at university of technology in Baghdad city during October 2017 and daytime between (9am -15pm) hours. The obtained results for three different fluids are as follows:  - Using (CuO + distilled water) as a working fluid increases the average of the output temperatures by 10.4%,  the average of useful heat gains   increases  by 11%  and the average of the collector efficiencies increases by15%.    - Using ( +distilled water) as a working fluid increased the average of output temperatures by 4%, the average of useful heat gains is increased by 6.5% and the average of collector efficiencies is increased by 8.2%.  

Dual-sensitized upconversion-assisted, triple-band absorbing luminescent solar concentrators

Nanoscale ◽  
2020 ◽  
Vol 12 (33) ◽  
pp. 17265-17271
Author(s):  
Seong Kyung Nam ◽  
Kiwon Kim ◽  
Ji-Hwan Kang ◽  
Jun Hyuk Moon
Keyword(s):  
Solar Light ◽  
Photovoltaic Systems ◽  
Solar Concentrator ◽  
Solar Concentrators ◽  
Luminescent Solar Concentrators ◽  
Luminescent Solar Concentrator ◽  
Triple Band

Luminescent solar concentrator-photovoltaic systems (LSC-PV) harvest solar light by using transparent photoluminescent plates, which is expected to be particularly useful for building-integrated PV applications.

Studying noise immunity of radio information transmission systems with noise-like phase-shift keyed signals and synchronization delay errors

2019 ◽  
pp. 105-113
Author(s):  
G. N. Maltsev ◽  
A. V. Evteev
Keyword(s):  
Phase Shift ◽  
Information Transmission ◽  
Noise Immunity ◽  
Tracking System ◽  
Tracking Error ◽  
Information Symbol ◽  
Transmission Systems ◽  
Synchronization System ◽  
Correlation Receiver ◽  
Selection Of

Introduction: Radio information transmission systems with noise-like phase-shift keyed signals based on pseudo-random sequences have potential noise immunity provided by accurately tracking the delay of the received signal in the correlation receiver. When working with moving objects, the delay of the received signal varies continuously, and the reception quality for noise-like phase-shifted signals highly depends on the synchronization system operation and on the accuracy of estimating the received signal delay by the tracking system. To ensure the required signal reception quality, it is necessary to provide an informed choice of tracking system parameters, taking into account their effects, which are the random and systematic components of the delay tracking error, on the selected noise immunity indicator.Purpose: Analyzing how the errors in tracking the delay of a received phase-shift keyed signal based on a pseudorandom sequence by the synchronization system of a radio information transmission system can affect the probability of erroneous reception of an information symbol.Results: The calculation method was used to obtain families of dependencies of the probability of erroneous reception of an information symbol on the signal-noise ratio (SNR), and the values of the random and systematic components of the delay tracking error which are normalized to the capture band of the correlation receiver. It has been shown that at a fixed SNR, the values of the random and systematic components of the delay tracking error are critical for the erroneous reception probability. In all the cases discussed, all the dependencies are characterized by a slow change of the erroneous reception probability while the synchronization errors within the area of small SNR have fixed values. As the SNR value grows, the erroneous reception probability rapidly drops. To ensure the specified signal reception quality and the reliability of the selection of information symbols and messages in a radio information transmission system with noise-like phase-manipulated signals, its synchronization system requires a joint selection of the tracking system parameters, taking into account the limitations imposed by the operating conditions and technical implementation features.Practical relevance: The obtained results can be used in noise immunity analysis of radio information transmission systems with noise-like phase-shift keyed signals in a wide range of communication conditions, and in providing technical solutions for synchronization systems ensuring the required quality of signal reception.

scholarly journals Robot-assisted Ultrasound-guided Tracking of Anatomical Structures for the Application of Focused Ultrasound

2020 ◽  
Vol 6 (3) ◽  
pp. 123-126
Author(s):  
Michael Unger ◽  
Johann Berger ◽  
Bjoern Gerold ◽  
Andreas Melzer
Keyword(s):  
Focused Ultrasound ◽  
Varicose Veins ◽  
Tracking System ◽  
Tracking Error ◽  
Uterine Fibroids ◽  
High Intensity Focused Ultrasound ◽  
Robot Assisted ◽  
Anatomical Structures ◽  
Surgical Tool ◽  
Custom Made

AbstractHigh intensity focused ultrasound is used as a surgical tool to treat completely non-invasively several diseases. Examples of clinical applications are uterine fibroids, prostate cancer, thyroid nodules, and varicose veins. Precise targeting is key for improving the treatment outcome. A method for an automated, robot-assisted tracking system was developed and evaluated. A wireless ultrasound scanner was used to acquire images of the target, in this case, a blood vessel. The active contour approach by Chan and Vese was used to segment and track while moving the scanner along the target structure with a collaborative robotic arm. The performance was assessed using a custom made Agar phantom. The mean tracking error, which is defined as the remaining distance of the lesion to the images’ centre line, was 0.27 mm ± 0.18 mm.

scholarly journals Cost-effective solar concentrators based on red fluorescent Zn(ii)–salicylaldiminato complex

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17474-17482 ◽  
Author(s):  
Pierpaolo Minei ◽  
Elisabetta Fanizza ◽  
Antonio M. Rodríguez ◽  
Ana B. Muñoz-García ◽  
Paola Cimino ◽  
...  
Keyword(s):  
Zinc Complex ◽  
Red Light ◽  
Cost Effective ◽  
Solar Concentrator ◽  
Solar Concentrators ◽  
Luminescent Solar Concentrator

A red light and concentrated zinc complex embedded in PMMA yields a cost-effective and efficient luminescent solar concentrator.

Wavelet Filter Approach for GPS Attitude Tracking System on Ship

2010 ◽  
Vol 450 ◽  
pp. 552-555
Author(s):  
Ping Wang ◽  
Kai Xue ◽  
Qiu Hong Li
Keyword(s):  
High Frequency ◽  
Tracking System ◽  
Tracking Error ◽  
Low Frequency ◽  
Attitude Measurement ◽  
Visual Effects ◽  
Error Sources ◽  
Attitude Tracking ◽  
Servo Mechanism ◽  
Filter Approach

GPS attitude tracking system on the ship is a servo mechanism which could be used for counteracting the effects of the ship’s pitch and roll. But the attitude measurement precision of ship is more important to the tracking precision of the servo mechanism. As one of the major error sources, the noises of GPS attitude measurement bring out the steady tracking error of the tracking servo mechanism. To reduce the steady error due to the noise, the threshold noise removing method of wavelet is used to eliminate the noise. And the better result with the meaning of standard deviation and the better visual effects could be gotten by using the method. The signals of the processed high frequency and the retained low frequency could be reconstructed with the original signals. Therefore, the signals after noise removing could be obtained. The threshold noise removing method of wavelet used to remove the noise of GPS attitude information in the paper is of great value in practice.

Design, Development and Performance Test of Two-Axis Solar Tracker System

2014 ◽  
Vol 704 ◽  
pp. 350-354
Author(s):  
Muhammad Ikram Mohd Rashid ◽  
Nik Fadhil bin Nik Mohammed ◽  
Suliana binti Ab Ghani ◽  
Noor Asiah Mohamad
Keyword(s):  
Tilt Angle ◽  
Solar Collector ◽  
Performance Test ◽  
Tracking System ◽  
Electrical Power ◽  
Solar Thermal ◽  
The Sun ◽  
Solar Pv ◽  
Design Development ◽  
Solar Tracking

The energy extracted from photovoltaic (PV) or solar thermal depends on solar insolation. For the extraction of maximum energy from the sun, the plane of the solar collector should always be normal to the incident radiation. Sun trackers move the solar collector to follow the sun trajectories and keep the orientation of the solar collector at an optimal tilt angle. Energy efficiency of solar PV or solar thermal can be substantially improved using solar tracking system. In this paper, an automatic solar tracking system has been designed and developed using DC motor on a mechanical structure with gear arrangement. The movements of two-axis solar trackers for the elevation and azimuth angles are programmed according to the mathematical calculation by using the Borland C++ Builder. Performance of the proposed system over the important parameter like solar radiation received on the collector, maximum hourly electrical power has been evaluated and compared with those for fixed tilt angle solar collector.

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