prEN ISO 24194
(Main)Solar energy - Collector fields - Check of performance (ISO/DIS 24194:2025)
Solar energy - Collector fields - Check of performance (ISO/DIS 24194:2025)
This document specifies two procedures to check the performance of solar thermal collector fields. This document is applicable to glazed flat plate collectors, evacuated tube collectors and/or tracking, concentrating collectors used as collectors in fields.
The check can be done on the thermal power output of the collector field and also be on the daily yield of the collector field.
The document specifies for the two procedures how to compare a measured output with a calculated one.
The document applies for all sizes of collector fields.
Sonnenenergie - Kollektorfelder - Überprüfung der Leistungsfähigkeit (ISO/DIS 24194:2025)
Energie solaire - Champs de capteurs - Vérification de la performance (ISO/DIS 24194:2025)
Le présent document spécifie deux procédures de vérification de la performance des champs de capteurs thermiques solaires. Le présent document est applicable aux capteurs plans vitrés, aux capteurs à tubes sous vide et/ou aux capteurs suiveurs à concentration utilisés comme capteurs dans les champs.
La vérification peut porter sur la puissance thermique de sortie du champ de capteurs et peut également porter sur le rendement journalier du champ de capteurs.
Le présent document spécifie pour les deux procédures comment comparer une puissance mesurée avec une puissance calculée.
Le présent document s'applique aux champs de capteurs de toutes tailles.
Sončna energija - Polja sprejemnikov sončne energije - Preverjanje zmogljivosti (ISO/DIS 24194:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Sončna energija - Polja sprejemnikov sončne energije - Preverjanje zmogljivosti
(ISO/DIS 24194:2025)
Solar energy - Collector fields - Check of performance (ISO/DIS 24194:2025)
Sonnenenergie - Kollektorfelder - Überprüfung der Leistungsfähigkeit (ISO/DIS
24194:2025)
Energie solaire - Champs de capteurs - Vérification de la performance (ISO/DIS
24194:2025)
Ta slovenski standard je istoveten z: prEN ISO 24194
ICS:
27.160 Sončna energija Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 24194
ISO/TC 180/SC 4
Solar energy — Collector fields —
Secretariat: SAC
Check of performance
Voting begins on:
Energie solaire — Champs de capteurs — Vérification de la
2025-05-14
performance
Voting terminates on:
ICS: 27.160 2025-08-06
THIS DOCUMENT IS A DRAFT CIRCULATED
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IS THEREFORE SUBJECT TO CHANGE
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Reference number
ISO/DIS 24194:2025(en)
DRAFT
ISO/DIS 24194:2025(en)
International
Standard
ISO/DIS 24194
ISO/TC 180/SC 4
Solar energy — Collector fields —
Secretariat: SAC
Check of performance
Voting begins on:
Energie solaire — Champs de capteurs — Vérification de la
performance
Voting terminates on:
ICS: 27.160
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
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Published in Switzerland Reference number
ISO/DIS 24194:2025(en)
ii
ISO/DIS 24194:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 General . 5
5.1 Validity .5
5.2 Methodology and operating conditions .6
5.3 Source of input information .6
5.4 Application .6
6 Procedure for checking the power performance of solar thermal collector fields –
Power Check . 7
6.1 Stating an estimate for the thermal power output of a collector field .7
6.2 Calculating estimated power output .7
6.2.1 General .7
6.2.2 General Formula (1) for power estimate – using beam and diffuse irradiance .8
6.2.3 Simplified Formula (2) – using hemispherical irradiance.8
6.3 Restrictions on operating conditions .8
6.4 Shadows .9
6.4.1 Shading from the surroundings .9
6.4.2 General shadow impact of collectors on each other .9
6.4.3 Shadows on fixed collectors in rows .10
6.4.4 Shadows on one-axis tracking collectors in row .10
6.5 Collector incidence angle . 13
6.6 Stagnation and periods of deliberately reduced performance . 13
6.7 Unmodeled Effects . 13
6.8 Example of setting up an equation for calculating performance estimate.14
6.9 Determination of potential valid periods . 15
6.10 Checking collector field power performance . 15
7 Procedure for checking the daily yield of solar thermal collector fields – Daily Yield
Check . 17
7.1 Stating an estimate for the daily yield of a collector field .17
7.2 Calculating daily energy yield . .17
7.2.1 General .17
7.2.2 Formula (19) for daily yield estimate .17
7.3 Restrictions on operating conditions .18
7.4 Shadows .19
7.5 Collector incidence angle .19
7.6 Example of setting up an equation for calculating performance estimate.19
7.7 Determination of potential valid periods .21
7.8 Checking collector field daily yield performance .21
8 Procedure for checking the annual yield of solar thermal collector fields – Annual Yield
Check .23
8.1 Stating an estimate for the annual yield of a collector field . 23
8.2 Calculating annual energy yield . 23
8.2.1 General . 23
8.2.2 General Formula (27) for liquid heating collectors .27
8.3 Restrictions on operating conditions .31
8.4 Shadows .32
8.4.1 Shading from the surroundings .32
8.4.2 General shadow impact of collectors on each other .32
iii
ISO/DIS 24194:2025(en)
8.5 Switch-off times and power reducing control strategies – planned and unplanned .32
8.6 Example of setting up an equation for calculating performance estimate. 33
8.7 Determination of potential valid periods . 33
8.8 Checking collector field annual yield performance . 33
9 Measurements needed.35
9.1 General . 35
9.2 Requirements on measurements, sensors and data .37
9.2.1 Accuracy .
...
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