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Atmospheric Transmittance Model Validation for CSP Tower Plants

Hanrieder, Natalie and Ghennioui, Abdellatif and Merrouni, Ahmed and Wilbert, Stefan and Wiesinger, Florian and Sengupta, M. and Zarzalejo, L.F. and Schade, Alexander (2019) Atmospheric Transmittance Model Validation for CSP Tower Plants. Remote Sensing, 11 (1083), pp. 1-18. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs11091083 ISSN 2072-4292

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Official URL: https://www.mdpi.com/2072-4292/11/9/1083


In yield analysis and plant design of concentrated solar power (CSP) tower plants, increased uncertainties are caused by the mostly unknown solar attenuation between the concentrating Heliostat field and the receiver on top of the tower. This attenuation is caused mainly by aerosol particles and water vapor. Various on-site measurement methods of atmospheric extinction in solar Tower plants have been developed during recent years, but during resource assessment for distinct Tower plant projects in-situ measurement data sets are typically not available. To overcome this lack of information, a transmittance model (TM) has been previously developed and enhanced by the authors to derive the atmospheric transmittance between a heliostat and receiver on the basis of common direct normal irradiance (DNI), temperature, relative humidity and barometric pressure measurements. Previously the model was only tested at one site. In this manuscript, the enhanced TM is validated for three sites (CIEMAT’s Plataforma Solar de Almería (PSA), Spain, Missour, Morocco (MIS) and Zagora, Morocco (ZAG)). As the strongest assumption in the TM is the vertical Aerosol particle profile, three different approaches to describe the vertical profile are tested in the TM. One approach assumes a homogeneous aerosol profile up to 1 kilometer above ground, the second approach is based on LIVAS profiles obtained from Lidar measurements and the third approach uses boundary layer height (BLH) data of the European Centre for Medium-Range Weather Forecasts (ECMWF). The derived broadband transmittance for a slant range of 1 km (T1km) time series is compared with a reference data set of on-site absorption- and broadband corrected T1km derived from meteorological optical range (MOR) measurements for the temporal period between January 2015 and November 2017. The absolute mean bias error (MBE) for the TM’s T1km using the three different aerosol profiles lies below 5% except for ZAG and one profile assumption. The MBE is close to 0 for PSA and MIS assuming a homogeneous extinction coefficient up to 1 km above ground. The root mean square error (RMSE) is around 5–6% for PSA and ZAG and around 7–8% for MIS. The TM performs better during summer months, during which more data points have been evaluated. This validation proves the applicability of the transmittance model for resource assessment at various sites. It enables the identification of a clear site with high T1km with a high accuracy and provides an estimation of the T1km for hazy sites. Thus it facilitates the decision if on-site extinction measurements are necessary. The model can be used to improve the accuracy of yield analysis of tower plants and allows the site adapted design.

Item URL in elib:https://elib.dlr.de/128862/
Document Type:Article
Title:Atmospheric Transmittance Model Validation for CSP Tower Plants
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hanrieder, NatalieNatalie.Hanrieder (at) dlr.dehttps://orcid.org/0000-0002-9671-351X
Ghennioui, AbdellatifIRESENUNSPECIFIED
Wilbert, StefanStefan.Wilbert (at) dlr.dehttps://orcid.org/0000-0003-3573-3004
Wiesinger, Florianflorian.wiesinger (at) dlr.dehttps://orcid.org/0000-0002-7062-0497
Date:7 May 2019
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/rs11091083
Page Range:pp. 1-18
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:atmospheric extinction; attenuation loss; transmittance model; central receiver; solar resource assessment; CSP
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Impact of Desert Environment
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2019 15:18
Last Modified:10 Feb 2020 11:49

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