The performance of parabolic trough (PT) receiver tubes (RTs) has a direct impact on concentrated solar power (CSP) plant production. As a result, one major need of operation and maintenance (O&M) in operating plants is to monitor the state of the receiver tube as a key element in the solar field. In order to fulfill this necessity, Abengoa Solar has developed the first existing portable device for measuring the transmittance and reflectance of parabolic trough receiver tubes directly in the field. This paper offers a description of the technical features of the instrument and reviews the issues related to its usability as a workable portable device in operating solar fields. To evaluate its performance, laboratory studies have been carried out using two patterns to determine the accuracy and standard deviation of the measurements, obtaining excellent results. This information is complemented with data collected by O&M using this instrument in solar power plants. Studies have been carried out to determine the effect of both rainfall and artificial cleaning on the increase of transmittance. These values are then compared to those obtained from hand-cleaning, and show important differences. The results are discussed in this paper.

References

References
1.
Sawin
,
J. L.
, and
Martinot
,
E.
,
2011
, “
Renewables Bounced Back in 2010, Finds REN21 Global Report
,”
Renewable Energy World
, Sept. 29, epub.
2.
Poullikas
,
A.
,
2009
, “
Economic Analysis of Power Generation From Parabolic Trough Solar Thermal Plants for the Mediterranean Region—A Case Study for the Island of Cyprus
,”
Renewable Sustainable Energy Rev.
,
13
(
9
), pp.
2474
2484
.
3.
Forristal
,
R.
,
2003
, “
Heat Transfer Analysis and Modeling of Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver
,” NREL, Golden, CO, Technical Report No.
NREL
/TP550-34169.
4.
Price
,
H.
,
2003
, “
A Parabolic Trough Solar Power Plant Simulation Model
,” NREL, Golden, CO, Report No. NREL//CP-550-33209.
5.
Giostri
,
A.
,
Binotti
,
M.
,
Astolfi
,
M.
,
Silva
,
P.
,
Macchi
,
E.
, and
Manzolini
,
G.
,
2012
, “
Comparison of Different Solar Plants Based on Parabolic Trough Technology
,”
Sol. Energy
,
86
(
5
), pp.
1208
1221
.
6.
Zaversky
,
F.
,
Garcia-Barberena
,
J.
,
Sanchez
,
M.
, and
Astrain
,
D.
,
2012
, “
Probabilistic Modeling of a Parabolic Trough Collector Power Plant—An Uncertainty and Sensitivity Analysis
,”
Sol. Energy
,
86
(
7
), pp.
2128
2139
.
7.
Meyen
,
S.
,
Fernández-García
,
A.
,
Kennedy
,
C.
, and
Lüpfert
,
E.
,
2010
, “
Standardization of Solar Mirror Reflectance Measurements—Round Robin Test
,”
SolarPACES 2010
, Perpignan, France, Sept. 21–14, Paper No. NREL/CP-5500-49189.
8.
Gombert
,
A.
,
Glaubitt
,
W.
,
Rose
,
K.
,
Dreibholz
,
J.
,
Heinzel
,
A.
,
Sporn
,
D.
,
Döll
,
W.
, and
Wittwer
,
V.
,
2000
, “
Antireflective Transparent Covers for Solar Devices
,”
Sol. Energy
,
68
(
4
), pp.
357
360
.
9.
Vicente
,
G. S.
,
Bayón
,
R.
,
Germán
,
N.
, and
Morales
,
A.
,
2009
, “
Surface Modification of Porous Antireflective Coatings for Solar Glass Covers
,”
Sol. Energy
,
85
(
4
), pp.
676
680
.
10.
Kennedy
,
C. E.
,
2002
, “
Review of Mild to High Temperature Solar Selective Absorber Materials
,” NREL, Golden, CO, Technical Report No.
NREL
/TP-520-31267.
11.
PerkinElmer
,
2015
, “
LAMBDA 950 UV/Vis/NIR Spectrophotometer
,” accessed on Oct. 26, 2015, http://www.perkinelmer.com/Catalog/Product/ID/L950
12.
ASTM G 173-03,
2015
, “
Reference Solar Spectral Irradiance: Air Mass 1.5
,” accessed Sept. 8, 2015, http://rredc.nrel.gov/solar/spectra/am1.5/
13.
Kouibia
,
A.
, and
Pasadas
,
M.
,
2008
, “
Approximation by Interpolating Variational Splines
,”
J. Comput. Appl. Math.
,
218
(
2
), pp.
342
349
.
14.
BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, and OIML
,
1995
, “
Guide to the Expression of Uncertainty in Measurement
,” International Organization for Standardization, Geneva, Switzerland.
15.
Crawford
,
J. S.
,
Stewart
,
J.
, and
Pérez-Ullivarri
,
J. A.
,
2012
, “
A Comparison of Three Portable Reflectometers for Use in Operations and Maintenance of CSP Plants
,”
Solar PACES Conference
, Marrakech, Morocco, pp.
223
230
.
16.
Cohen
,
G. E.
,
Kearney
,
D. W.
, and
Kolb
,
G. J.
,
1999
, “
Final Report on the Operation and Maintenance Improvement Program for Concentrating Solar Power Plants
,”
Sandia National Laboratories
,
Albuquerque, NM
, Report No.
SAND99-1290
.
17.
Constantin
,
D. G.
,
Apreutesei
,
M.
,
Arvinte
,
R.
,
Marin
,
A.
,
Andrei
,
O. C.
, and
Munteanu
,
D.
,
2011
, “
Magnetron Sputtering Technique Used for Coatings Deposition; Technologies and Applications
,” 7th International Conference on Materials Science and Engineering (
BRAMAT 2011
), Brasov, Romania, Feb. 24–26.
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