scholarly journals Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors

2012 ◽  
Author(s):  
J. Kathleen Stynes ◽  
Benjamin Ihas
Keyword(s):  
Digital Camera ◽  
Two Dimensions ◽  
Physical Contact ◽  
New Method ◽  
Measurement Tool ◽  
Optical Performance ◽  
Solar Collectors ◽  
Parabolic Trough ◽  
Critical Information ◽  
Optical Tools

As we pursue efforts to lower the capital and installation costs of parabolic trough solar collectors, it is essential to maintain high optical performance. While there are many optical tools available to measure the reflector slope errors of parabolic trough solar collectors, there are few tools to measure the absorber alignment. A new method is presented here to measure the absorber alignment in two dimensions to within 0.5 cm. The absorber alignment is measured using a digital camera and four photogrammetric targets. Physical contact with the receiver absorber or glass is not necessary. The alignment of the absorber is measured along its full length so that sagging of the absorber can be quantified with this technique. The resulting absorber alignment measurement provides critical information required to accurately determine the intercept factor of a collector.

A comprehensive review of parabolic trough solar collectors equipped with turbulators and numerical evaluation of hydrothermal performance of a novel model

2021 ◽  
Vol 45 ◽  
pp. 101103 ◽  
Author(s):  
Muhammad Shahzad Nazir ◽  
Amin Shahsavar ◽  
Masoud Afrand ◽  
Müslüm Arıcı ◽  
Sandro Nižetić ◽  
...  
Keyword(s):  
Numerical Evaluation ◽  
Solar Collectors ◽  
Parabolic Trough ◽  
Comprehensive Review ◽  
Novel Model

An Optical Scanner for Testing Parabolic Trough Solar Collectors

1982 ◽  
Vol 11 (1) ◽  
pp. 18-22
Author(s):  
B. K. Roy ◽  
P. N. Puntambekar ◽  
D. Sen
Keyword(s):  
Solar Collectors ◽  
Parabolic Trough ◽  
Optical Scanner

Microcontroller Based Single Axis Intelligent Control Sun Tracker for Parabolic Trough Collectors

2012 ◽  
Vol 562-564 ◽  
pp. 1772-1775
Author(s):  
Shakeel Akram ◽  
Farhan Hameed Malik ◽  
Rui Jin Liao ◽  
Bin Liu ◽  
Tariq Nazir
Keyword(s):  
Energy Efficiency ◽  
Embedded System ◽  
Alternative Energy ◽  
Power Plants ◽  
Tracking System ◽  
Appropriate Technology ◽  
Working Fluid ◽  
The Sun ◽  
Solar Collectors ◽  
Parabolic Trough

Due to the complex design and high costs of production, solar thermal systems have fallen behind in the world of alternative energy systems. Different mechanisms are applied to increase the efficiency of the solar collectors and to reduce the cost. Solar tracking system is the most appropriate technology to increase the efficiency of solar collectors as well as solar power plants by tracking the sun timely. In order to maximize the efficiency of collectors, one needs to keep the reflecting surface of parabolic trough collectors perpendicular to the sun rays. For this purpose microcontroller based real time sun tracker is designed which is controlled by an intelligent algorithm using shadow technique. The aim of the research project is to test the solar-to-thermal energy efficiency by tracking parabolic trough collector (PTC). The energy efficiency is determined by measuring the temperature rise of working fluid as it flows through the receiver of the collector when it is properly focused. The design tracker is also simulated to check its accuracy. The main purpose to design this embedded system is to increase the efficiency and reliability of solar plants by reducing size, complexity and cost of product.

Adoption of nanofluids in low-enthalpy parabolic trough solar collectors: Numerical simulation of the yearly yield

2016 ◽  
Vol 118 ◽  
pp. 306-319 ◽  
Author(s):  
Gianluca Coccia ◽  
Giovanni Di Nicola ◽  
Laura Colla ◽  
Laura Fedele ◽  
Mauro Scattolini
Keyword(s):  
Numerical Simulation ◽  
Solar Collectors ◽  
Parabolic Trough

scholarly journals Digital Imaging as a Possible Approach in Evaluation of Islet Yield

2003 ◽  
Vol 12 (2) ◽  
pp. 129-133 ◽  
Author(s):  
Peter Girman ◽  
Jan Kříž ◽  
Jozef Friedmanský ◽  
FrantišEk Saudek
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Digital Imaging ◽  
Digital Image Analysis ◽  
Three Dimensional ◽  
Two Dimensions ◽  
New Method ◽  
Important Method ◽  
Three Dimensional Objects ◽  
Significant Difference

Digital image analysis (DIA) is a new method in assessment of islet amount, which is expected to provide reliable and consistent results. We compared this method with conventional counting of small numbers of rat islets. Islets were isolated from 8 pancreases and counted in 24 samples in duplicate, first routinely by sizing according to estimated diameters under a calibrated reticule and then by processing of islets pictures taken by camera. As presumed, no significant difference was found in absolute numbers of islets per sample between DIA and conventional assessment. Volumes of islets per sample measured by DIA were on average more than 10% higher than amounts evaluated conventionally, which was statistically significant. DIA has been shown to be an important method to remove operator bias and provide consistent results. Evaluation of only two dimensions of three-dimensional objects still represents a certain limitation of this technique. With lowering of computer prices the system could become easily available for islet laboratories.

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