Atmospheric Transmittance Model Validation for CSP Tower Plants

Remote Sensing

Luis Zarzalejo¹  Stefan Wilbert²  Florian Wiesinger²  Natalie Hanrieder²  Abdellatif Ghennioui³  Ahmed Alami Merrouni³  Alexander Schade⁴  Manajit Sengupta⁵ 

[1] Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), División de Energías Renovables. Avda. Complutense 40, 28040 Madrid, Spain;German Aerospace Center (DLR), Institute of Solar Research, Plataforma Solar de Almería (PSA), Ctra. de Senés s/n km 4, Apartado 39, 04200 Tabernas, Spain;Institut de Recherche, Energie Solaire et Energies Nouvelles (IRESEN), Green Energy Park, Km 2 Route Régionale R206, Benguerir 43152, Morocco;Institute of Physics and Meteorology, University Hohenheim, 70593 Stuttgart, Germany;National Renewable Energy Laboratory, 1617 Cole Blvd, Golden, CO 80401, USA;

关键词: atmospheric extinction;    attenuation loss;    transmittance model;    central receiver;    solar resource assessment;    CSP;   

DOI  :  10.3390/rs11091083

来源: DOAJ

【 摘 要 】

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 ( $T_{1km}$ ) time series is compared with a reference data set of on-site absorption- and broadband corrected $T_{1km}$ 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 $T_{1km}$ 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 $T_{1km}$ with a high accuracy and provides an estimation of the $T_{1km}$ 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.

【 授权许可】

Unknown