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

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
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 117 - Solar thermal electric plants
• Drafting Committee: PT 62862-5-2 - TC 117/PT 62862-5-2
• Current Stage: PPUB - Publication issued
• Start Date: 06-Jun-2022
• Completion Date: 10-May-2022

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: [e-mail].
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
...