... of base reflectivity and average soiling Cleanliness factor as a function of time within a washing cycle 63 washes/year (approx. 1 per 6 days) 2021 SAM baseline Degradation rate as a function of time (%/month) No degradation assumed 2021 SAM baseline Optical error (single-axis slope-error...

...Rebecca Mitchell; Kyle Sperber; Michael Grabel; Guangdong Zhu Optics plays a major role in the effectiveness of concentrating solar power (CSP) technologies. The nonintrusive optical (NIO) approach developed by the National Renewable Energy Laboratory uses uncrewed aircraft system (UAS)-based...

... of the segment mirrors of each heliostat. The method is based on the sunlight directed toward the receiver, and thus works under full operational conditions and without the need of secondary optical alignments. It is based on retroreflectors (“retros”) to simultaneously return samples of the sunlight reflected...

... as the asymmetric compound parabolic concentrator (ACPC). To date, there is no published experimental data at different latitudes on the long-term performance of these systems at these latitudes nor how location would modify the optical characteristics of deployed systems. Previous theoretical research...

...) , Freiburg, Germany , Sept. 28–Oct. 2 , p. 070005 . [6] Mitchell , R. A. , and Zhu , G. , 2020 , “ A Non-Intrusive Optical (NIO) Approach to Characterize Heliostats in Utility-Scale Power Tower Plants: Methodology and In-Situ Validation ,” Sol. Energy , 209 , pp. 431 – 445 . 10.1016...

... deg 0.50 cm 2 3 Devices and Services 15R -USB (D&S) Specular (15 mrad, 25 mrad, 46 mrad) 660-nm peak irradiance 15 deg (5.1×10 −4 ) cm 2 5 Surface Optics Corporation (SOC) Solar 410 Hemispherical/specular Bands from 335–2500 nm Near normal 0.18 cm 2 20 Table 3...

...Matteo Timpano; Thomas A. Cooper This paper presents a detailed analysis of the optical performance of circular trough concentrators with tubular receivers. First, a simple analytical formula for the achievable geometric concentration ratio as a function of the rim angle and acceptance angle...

... shape formed by the combined reflectors does not need to be paraboloidal; for example, it could be a flat surface tilted appropriately. Small gaps between adjacent reflectors would be needed to reduce shading and blocking losses. The paraboloidal shape is convenient for use in SAM because the optical...

... flow heat transfer optics parabolic trough radiation simulation solar receiver sustainability thermal power Concentrated solar thermal energy applications play an important role in transitioning our current energy system to a more sustainable system. In such a system, solar thermal...

.... , and Doblaré Castellano , M. , 2016 , “ Optical Analysis of a Two Stage XX Concentrator for Parametric Trough Primary and Tubular Absorber With Application in Solar Thermal Energy Trough Power Plants ,” ASME J. Sol. Energy. Eng. , 138 ( 4 ), p. 041002 . 10.1115/1.4032944 [50] Canavarro , D...

... Foundation (Grant No. CBET-2103008). There are no conflicts of interest. The datasets generated and supporting the findings of this article are obtainable from the corresponding author upon reasonable request. ℓ = optical index ( a , e , or s for absorption, extinction...

..., TEM 00 -mode laser operation can prevent damage in the optics of the laser resonator due to its smooth profile, avoiding the appearance of hot sites inside the Nd:YAG laser media [ 27 ]. The decrease in the laser rod volume makes the laser material more resistant to thermal stress and thermal load...

... collector optics solar receiver solar thermal power The main advantage of concentrating solar thermal (CST) power plants over many other forms of renewable energy is that collected energy can be stored quite cheaply and very efficiently for many hours in the form of heat and then converted...

...William T. Hamilton; Michael J. Wagner; Alexander J. Zolan solarpilot is a software package that generates solar field layouts and characterizes the optical performance of concentrating solar power (CSP) tower systems. solarpilot was developed by the National Renewable Energy Laboratory (NREL...

... : I ncluding W ind E nergy and B uilding E nergy C onservation . 31 07 2021 01 01 2022 02 01 2022 27 01 2022 azimuth-elevation graphical ray tracing heliostat spinning-elevation tracking angle optics solar receiver solar tower Proper tracking...

...Muhammad Uzair; Naveed ur Rehman; Muhammad Asif This study developed a methodology for determining the intercept factor (γ) and reports the effects of varying the design parameters, within realistic ranges, on the optical performance of parabolic trough collectors (PTC). The design equations...

... and radii of facets are constrained so that the ray refracted from the bottom vertex of each facet on one side of the optical axis and the ray refracted from the outer vertex of the corresponding facet on the other side of the optical axis must intersect at the focal plane. The proposed lens design has...

...-Pumped Solid State Laser Program ,” 10th Meeting on Optical Engineering in Israel , Jerusalem, Israel , Sept. 22 , I. Shladov , and S. R. Rotman , eds., SPIE , pp. 196 – 201 . [2] Hemmati , H. , Biswas , A. , and Djordjevic , I. B. , 2011 , “ Deep-Space Optical...

... ins by d t a w l = d t a i n + 2 t t a w l , d t a e x = d t a w l + 2 t i n s The optical efficiency of the PTC is defined as the ratio of the power absorbed by the evaporator to the solar power impinging on the aperture area...

...Saboor Shaik; Manvendra Bhardwaj; Somya Agarwal; Raja Sekhar Yendaluru; Md. Hasanuzzaman; K. V. Sharma The energy gain of domestic solar water heating systems is determined by solar to thermal energy conversion and glazing optical efficiency. For this study, solar transmission properties...