The SolarPACES Reflectance Guideline provides an essential tool to obtain comparable reflectance measurements, but because of the lack of adequate commercial instrumentation, till now the exhaustive characterization of reflectance behaviour versus incidence θi and (half) acceptance angle φ is unachieved. An expert group in Task III has been working to outline some practicable solutions. The Equivalent Model Algorithm (EMA) was found quite promising: with few input data, EMA allows to predict any reflectance feature by computation. The recent availability of reliable reflectance measurements at oblique incidence made possible the refinement of EMA by analysing a representative set of commercial solar mirrors. This paper describes the new EMA for solar mirror, named EMA4SM, and reports its validation1.

Topics
Optical properties
1.
SolarPACES
,
CSP - How it Works
(
2016
).
2.
A.
 
Fernández-Garćıa
,
F.
 
Sutter
,
M.
 
Montecchi
,
F.
 
Sallabery
,
A.
 
Heimsath
,
C.
 
Heras
,
E.
 
Le Baron
, and
A.
 
Soum-Glaude
,
Parameters and Method to Evaluate the Reflectance Properties of Reflector Materials for Concentrating Solar Power Technology, V 3.0
(
2018
).
Google Scholar
 
3.
S.
 
Meyen
,
A.
 
Fernandez
,
C.
 
Kennedy
, and
E.
 
Lüpfert
,
“Standardization of solar mirror reflectance measurements – round robin test
,” in
Proceedings of SolarPACES 2010
(
2010
).
Google Scholar
 
4.
M.
 
Montecchi
,
“Upgrading of enea solar mirror qualification set-up
,” in
Energy Procedia
, Vol.
49
(
2014
), pp.
2154
–
2161
.
https://doi.org/10.1016/j.egypro.2014.03.228
Google Scholar
Crossref
Search ADS
 
5.
M.
 
Montecchi
,
Solar Energy
 
92
,
280
–
287
(
2013
).
https://doi.org/10.1016/j.solener.2013.03.014
Google Scholar
Crossref
Search ADS
 
6.
A.
 
Heimsath
,
T.
 
Schmid
, and
M.
 
Nitz
, P.,
Energy Procedia
 
69
, p.
1895
–
1899
(
2015
).
https://doi.org/10.1016/j.egypro.2015.03.173
Google Scholar
Crossref
Search ADS
 
7.
F.
 
Sutter
,
M.
 
Montecchi
,
H.
 
Von Dahlen
,
A.
 
Fernández-Garćıa
, and
M.
 
Röger
,
Solar Energy Materials and Solar Cells
 
176
, p.
119
–
133
(
2018
).
https://doi.org/10.1016/j.solmat.2017.11.029
Google Scholar
Crossref
Search ADS
 
8.
M.
 
Montecchi
,
“Proposal of a new parameter for the comprehensive qualification of solar mirrors for csp applications
,” in
AIP Conference Proceedings
, Vol.
1734
(
2016
).
Google Scholar
 
9.
M.
 
Montecchi
,
E.
 
Nichelatti
, and
P.
 
Polato
,
Solar Energy Materials and Solar Cells
 
71
,
327
–
342
(
2002
).
https://doi.org/10.1016/S0927-0248(01)00091-5
Google Scholar
Crossref
Search ADS
 
10.
ISO9050
,
Glass in building, Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors
(
2003
).
11.
L.
 
Vriens
 and
W.
 
Rippens
,
Applied Optics
 
22
,
4105
–
4110
(
1983
).
https://doi.org/10.1364/AO.22.004105
Google Scholar
Crossref
Search ADS
PubMed
 
12.
A.
 
Beckman
,
P.and
 
Spizzichino
,
The scattering of electromagnetic waves from rough surfaces
(
Perga-mon/Macmillan
,
1963
).
Google Scholar
 
13.
W. E.
 
Born
, M.,
Principles of Optics
(
1965
).
Google Scholar
 
14.
M.
 
Montecchi
,
C.
 
Delord
,
O.
 
Raccurt
,
A.
 
Disdier
,
F.
 
Sallaberry
,
A. Garćıa
 
de Jalón
,
A.
 
Fernández-Garćıa
,
S.
 
Meyen
,
C.
 
Happich
,
A.
 
Heimsath
, and
W.
 
Platzer
,
Energy Procedia
 
69
,
1904
–
1910
(
2015
).
https://doi.org/10.1016/j.egypro.2015.03.174
Google Scholar
Crossref
Search ADS
 
15.
E.
 
Nichelatti
,
J. Opt. A: Pure Appl. Opt.
 
4
,
400
–
403
(
2002
).
https://doi.org/10.1088/1464-4258/4/4/306
Google Scholar
Crossref
Search ADS
 
16.
F.
 
Sutter
,
A.
 
Fernández-Garćıa
,
A.
 
Heimsath
,
M.
 
Montecchi
, and
C.
 
Pelayo
,
“Advanced measurement techniques to characterize the near-specular reflectance of solar mirrors
,” in
AIP Conference Procedia
, Vol.
2126
(
2019
), pp.
2154
–
2161
.
Google Scholar
 
This content is only available via PDF.
© 2020 Author(s).
2020
Author(s)