SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems最新文献_第10页

Modelling and simulation of a supercritical carbon dioxide (sCO2) concentrated solar power (CSP) system 超临界二氧化碳(sCO2)聚光太阳能(CSP)系统的建模与仿真

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117656

R. V. D. Westhuizen, R. Dobson

引用次数: 4

Sun finders based on a pinhole camera 基于针孔相机的太阳探测器

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117585

D. Fontani, G. Marotta, F. Francini, D. Jafrancesco, P. Sansoni

引用次数: 0

A different way to approach enthalpy loss in supercritical regenerative closed Brayton cycles: The solar heater 一种不同的方法来处理超临界再生封闭布雷顿循环的焓损失:太阳能加热器

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117649

Luis F. González-Portillo, Javier Muñoz-Antón, J. Martínez-Val

引用次数: 0

Improving optical properties of diffusion-based absorber coatings for CSP tower systems 提高CSP塔架系统扩散基吸收涂层光学性能

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117511

T. Meißner, C. Oskay, D. Fähsing, M. Galetz

引用次数: 3

Circumsolar irradiance modelling using libRadtran and AERONET data 利用libRadtran和AERONET数据建立太阳辐照度模型

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117698

E. Abreu, P. Canhoto, M. J. L. Costa

{"title":"Circumsolar irradiance modelling using libRadtran and AERONET data","authors":"E. Abreu, P. Canhoto, M. J. L. Costa","doi":"10.1063/1.5117698","DOIUrl":"https://doi.org/10.1063/1.5117698","url":null,"abstract":"The aperture angle of pyrheliometers is greater than the limit angle of the solar disk, which leads to a contribution of circumsolar radiation to the measurements of direct normal irradiance (DNI). On the other hand, since Concentrating Solar Power (CSP) technologies have, generally, a lower aperture angle with respect to pyrheliometers, it is important to determine the fraction of circumsolar irradiance present in the DNI measurements as well as its angular distribution to provide accurate information for sizing and operation of CSP systems. In this work, the monochromatic circumsolar irradiance (at 675 nm) is modelled using libRadtran and AERONET data at Évora, Portugal for selected cases representing the 1st, 25th, 50th and 75th percentiles of the aerosol optical depth (AOD) measurements distribution at 675 nm and a maximum value of AOD registered during a Saharan dust outbreak in February 2017 in Portugal. The AERONET products used were the columnar values of water vapor content, aerosol optical depth (AOD) and aerosol phase function. Since there are no measurements of circumsolar irradiance at Évora, the assessment of the model output accuracy was done through a comparison of both the modelled DNI from the solar disk only and the DNI including the circumsolar contribution against measurements from a pyrheliometer included in a meteorological station installed at the same location. The mean bias error and the root mean square error were found to be lower for the DNI with the circumsolar contribution, thus validating the modelling approach of circumsolar irradiance.","PeriodicalId":21790,"journal":{"name":"SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84437574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Simulation of potential enhancements in parabolic trough solar field start-up controllers using nowcasting systems 利用临近预报系统模拟抛物线槽太阳能场启动控制器的潜在增强

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117679

Kareem Noureldin, T. Hirsch, B. Nouri, Zeyad Yasser

引用次数: 1

Demonstration of long term stability in air at high temperature for TiAlN solar selective absorber coatings TiAlN太阳能选择性吸收涂层在高温下在空气中的长期稳定性

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117509

Alex Carling-Plaza, M. A. Keilany, M. Bichotte, A. Soum-Glaude, L. Thomas, L. Dubost

引用次数: 1

Performance analysis of a hybrid solar/biomass power plant for different operating scenarios 不同运行工况下太阳能/生物质混合电厂的性能分析

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117607

A. Mouaky, E. Bennouna, A. Rachek, Brahim Bouhraichi, Nizar Lembarki, Oumama Idaghdour

引用次数: 0

In-situ reflectivity monitoring of heliostats using calibration cameras 利用标定相机监测定日镜的反射率

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117574

Ruizi Wang, P. Borghesani, M. Cholette, B. Duck, Lin Ma, T. Steinberg

{"title":"In-situ reflectivity monitoring of heliostats using calibration cameras","authors":"Ruizi Wang, P. Borghesani, M. Cholette, B. Duck, Lin Ma, T. Steinberg","doi":"10.1063/1.5117574","DOIUrl":"https://doi.org/10.1063/1.5117574","url":null,"abstract":"It is well-known that the efficiency of Concentrating Solar Power (CSP) plants depends strongly on maintaining a high level of heliostat reflectivity. To inform cleaning policies, an online assessment of heliostat reflectivity is highly desirable to provide real-time updates of current mirror conditions and optimise the cleaning policy, as necessary. There is currently, however, a lack of an economically feasible technique for performing a detailed online heliostat reflectivity assessment. In this paper, a low-cost heliostat reflectivity monitoring method based on already-installed targeting calibration cameras (e.g. CCD cameras) is proposed and tested. The key idea is to compare calibration camera images to detect the differences of image power caused by losses in heliostat reflectivity. Unlike previous beam characterization systems, the accuracy and sensitivity of reflectivity estimation for individual mirrors under increasingly soiled conditions is tested, and does not require additional sensors (e.g. radiometers or flux gauges). Using data obtained from field experiments conducted at the CSIRO Energy Centre in Newcastle, Australia, a methodology for estimating the mirror reflectivity from filtered calibration camera images was developed, calibrated, and validated. The model predictions showed a maximum absolute reflectivity error of 1% based on 4 consecutive soilings, which is comparable to the variability of (as accurate as) the reflectometer measurements themselves. The results of this study demonstrate the feasibility of using simple calibration camera images for economical reflectivity monitoring by removing the need for extensive manual measurements or expensive additional equipment. Such a methodology would allow assessment of cleaning benefits in the real-time operational context (e.g. weather, electricity market prices) and enable dynamic, data-driven cleaning decisions.","PeriodicalId":21790,"journal":{"name":"SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79673253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Modelling the soiling of heliostats: Assessment of the optical efficiency and impact of cleaning operations 定日镜的污垢建模:评估光学效率和清洁操作的影响

SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems Pub Date : 2019-07-01 DOI: 10.1063/1.5117555

Giovanni Picotti, M. Binotti, M. Cholette, P. Borghesani, G. Manzolini, T. Steinberg

{"title":"Modelling the soiling of heliostats: Assessment of the optical efficiency and impact of cleaning operations","authors":"Giovanni Picotti, M. Binotti, M. Cholette, P. Borghesani, G. Manzolini, T. Steinberg","doi":"10.1063/1.5117555","DOIUrl":"https://doi.org/10.1063/1.5117555","url":null,"abstract":"The optical efficiency of the solar field heliostats of a Concentrating Solar Power (CSP) tower plant is a fundamental parameter to assess the productivity of the plant. The optical efficiency is mainly affected by the position of the sun in the sky during the year, and by the cleanliness level of the heliostats, which is related to their reflectance. The reflectance is continuously diminished by the deposition of dust on the heliostat surface (that is, soiling). Natural cleaning events, as rain, are rare in typical locations for CSP plants, so artificial cleaning is the most common technique used to maintain the optical efficiency (heliostat reflectance) as close as possible to its optimal value in order to maximize the overall production and thus the revenues of the CSP plant. This paper provides a methodology to assess the soiling of a heliostat field and then evaluates the impact of artificial cleaning on the optical efficiency, considering different frequencies of cleaning in four different scenarios. The outcome of this study is a considerable step forward towards the optimization of costly cleaning activities to minimize operation costs in solar power technologies.","PeriodicalId":21790,"journal":{"name":"SOLARPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88200326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10