Solar thermal electric plants - Part 5-2: Systems and components - General requirements and test methods for large-size linear Fresnel collectors

IEC 62862-5-2:2022 specifies the requirements and the test methods for the characterization of a large-size linear Fresnel collector.
This document covers the determination of optical and thermal performance of linear Fresnel collectors, and the tracking accuracy of the collector one-axis tracking system. This test method is for outdoor testing only.
This document applies to linear Fresnel collectors according to Annex A equipped with the manufacturer-supplied sun tracking mechanism.
This document applies to the whole collector field in-situ or as a minimum unit to be tested to an individual collector string (loop) connected to the main piping (flow, return flow) to and from a heat sink, covering the full temperature range of the field.

General Information

Status
Published
Publication Date
09-May-2022
Current Stage
PPUB - Publication issued
Start Date
06-Jun-2022
Completion Date
10-May-2022
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IEC 62862-5-2:2022 - Solar thermal electric plants - Part 5-2: Systems and components - General requirements and test methods for large-size linear Fresnel collectors
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IEC 62862-5-2 ®
Edition 1.0 2022-05
INTERNATIONAL
STANDARD
colour
inside
Solar thermal electric plants –
Part 5-2: Systems and components – General requirements and test methods for
large-size linear Fresnel collectors
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IEC 62862-5-2 ®
Edition 1.0 2022-05
INTERNATIONAL
STANDARD
colour
inside
Solar thermal electric plants –

Part 5-2: Systems and components – General requirements and test methods for

large-size linear Fresnel collectors

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-0096-4

– 2 – IEC 62862-5-2:2022 © IEC 2022
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and symbols. 7
3.1 Terms and definitions . 7
3.2 Symbols . 8
4 Testing requirements . 9
5 Instrumentation . 9
5.1 Solar radiation measurement . 9
5.2 Flow rate measurement . 9
5.3 Temperature measurements . 9
5.4 Wind speed measurement . 10
5.5 Data acquisition . 10
5.6 Tracking accuracy measurement . 10
6 Test procedure . 10
6.1 General . 10
6.2 Collector description . 10
6.3 Test equipment . 10
6.3.1 Performance test . 10
6.3.2 Optical characterization for performance testing . 11
6.3.3 Tracking error test . 12
6.4 Measurement procedure . 12
6.4.1 General . 12
6.4.2 Cleanliness . 12
6.4.3 Test conditions . 13
6.5 Calculation and test results evaluation . 13
6.5.1 General . 13
6.5.2 Useful power . 14
6.5.3 Incidence angle modifier (IAM) . 15
6.5.4 Evaluation for the quasi-dynamic test method QDT . 17
6.5.5 Evaluation for the dynamic test method DT . 18
6.5.6 Validation performance test . 19
6.5.7 Tracking error test (optional) . 20
6.5.8 Uncertainty estimation . 21
7 Reporting format . 21
Annex A (informative) Linear Fresnel collector description . 22
A.1 General description . 22
A.1.1 Overview . 22
A.1.2 Collector row structure . 23
A.1.3 Support structure and foundation . 24
A.1.4 Primary reflectors . 24
A.1.5 Mirror support . 24
A.1.6 Mirror drives . 25
A.1.7 Receiver . 25
A.1.8 Receiver tube . 25
A.1.9 Receiver cavity . 26

A.1.10 Receiver support and casing . 27
A.1.11 Tracking system . 27
A.2 Operation modes . 28
Annex B (normative) Documentation to be supplied by the collector manufacturer . 29
B.1 General configuration of the linear Fresnel collector . 29
B.1.1 Model and manufacturer . 29
B.1.2 Axes and movements. 29
B.1.3 Collector grouping . 29
B.2 Geometric characterization of the linear Fresnel collector . 29
B.3 Mechanical characterization of the linear Fresnel collector . 29
B.4 Optical characterization of the linear Fresnel collector . 30
B.5 Description of linear Fresnel collector operating modes . 30
B.5.1 Design operating conditions . 30
B.5.2 Normal operating conditions . 30
B.5.3 Reduced weather/geological operating conditions (features to be
reduced shall be defined (optical, thermal performance) and how much
they are reduced) . 30
B.5.4 Stow conditions . 30
B.5.5 Survival conditions . 30
B.6 Optical and tracking accuracy . 30
B.6.1 Accuracy under normal operating conditions . 30
B.6.2 Accuracy under reduced operating conditions . 30
B.7 Linear Fresnel collector component information . 30
B.7.1 Linear Fresnel collector structure . 30
B.7.2 Receiver tube . 31
B.7.3 Receiver cavity . 31
B.7.4 Primary and secondary reflectors. 31
B.7.5 Drive mechanism . 31
Annex C (normative) Testing report . 32
C.1 General . 32
C.2 Collector characteristics . 32
C.3 Linear Fresnel collector limitations . 33
C.4 Description of the experimental setup . 33
C.5 Results . 33
Annex D (informative) Deflectometry mirror testing . 35
D.1 Mirror shape quality . 35
Annex E (informative) Tracking error testing . 36
Bibliography . 37

Figure 1 – Test equipment installation. 11
Figure 2 – Sketch of one module of linear Fresnel collector as seen from above . 15
Figure 3 – Incidence angles for a linear Fresnel collector . 16
Figure 4 – Sketch of parameter identification procedure used for the DT method [3] . 18
Figure A.1 – General view of a north-south axis Fresnel collector . 22
Figure A.2 – General view of an asymmetric east-west axis Fresnel collector . 23
Figure A.3 – Schematic drawing of individual drive a), group drive b) and field drive c)
options . 25

– 4 – IEC 62862-5-2:2022 © IEC 2022
Figure A.4 – Typical receiver cavity with secondary reflector and glass cover . 26
Figure A.5 – Typical receiver cavity with secondary reflector and without glass cover . 27
Figure A.6 – Typical receiver cavity with multiple parallel tubes . 27

Table C.1 – Alternate tracking accuracy reporting template . 33

INTE
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