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IEC TS 62862-2-1
Edition 1.0 2021-02
TECHNICAL
SPECIFICATION
colour
inside
Solar thermal electric plants –
Part 2-1: Thermal energy storage systems – Characterization of active, sensible
systems for direct and indirect configurations
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IEC TS 62862-2-1
Edition 1.0 2021-02
TECHNICAL
SPECIFICATION
colour
inside
Solar thermal electric plants –
Part 2-1: Thermal energy storage systems – Characterization of active, sensible
systems for direct and indirect configurations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-9320-1
– 2 – IEC TS 62862-2-1:2021 © IEC 2021
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Symbols and abbreviated terms . 9
5 Thermal energy storage (TES) systems . 10
5.1 Classification of TES systems . 10
5.2 TES systems covered by this document . 10
5.3 TES system limits . 10
5.4 Key components . 10
6 Instrumentation and measurement methods. 11
6.1 General . 11
6.2 Flow rate measurements . 11
6.3 Temperature measurements . 11
6.3.1 Heat transfer fluid temperatures . 11
6.3.2 Wall temperatures . 12
6.4 Level measurements . 12
6.5 Meteorological signal measurements . 12
6.5.1 Wind speed and direction . 12
6.5.2 Ambient temperature . 12
6.6 Data acquisition . 13
7 General requirementson tests . 13
7.1 General . 13
7.2 Test procedure . 13
7.2.1 General . 13
7.2.2 Items to be included in the test procedure . 14
7.2.3 Items to be agreed between the parties . 14
7.3 Definition of the test included in this document . 15
7.3.1 General . 15
7.3.2 Test to determine the thermal efficiency of the storage system . 15
7.3.3 Test to determine the heat capacity of the storage system . 15
7.3.4 Test to determine the thermal losses of the storage system . 16
7.3.5 Test to determine the global losses of the storage system . 16
7.3.6 Test to determine the wall temperature . 16
7.4 Test boundaries . 17
8 Storage system characterization (storage thermal performance and capacity) . 18
8.1 Thermal efficiency and storage capacity (storage thermal performance and
capacity) . 18
8.1.1 Test methodology . 18
8.1.2 Calculation procedure . 19
8.2 Thermal losses of the storage system . 23
8.2.1 Test methodology . 23
8.2.2 Calculation procedure . 23
8.3 Global energy losses of the storage system . 24
8.3.1 General . 24
8.3.2 Test methodology . 24
8.3.3 Calculation procedure . 25
9 Verification procedure . 25
10 Test report (results) . 27
Annex A (informative) Thermal energy storage system types . 28
A.1 Thermal energy storage modes . 28
A.1.1 General . 28
A.1.2 Sensible heat storage . 28
A.1.3 Latent heat storage . 28
A.1.4 Thermochemical energy storage . 29
A.2 TES configuration . 29
A.3 Circulation of the storage medium . 29
Annex B (informative) Description of the main components of the active direct/indirect
TES using molten salts . 31
B.1 Storage media . 31
B.2 Tanks and foundation. 31
B.2.1 Tanks . 31
B.2.2 Foundations . 32
B.2.3 Insulation . 32
B.3 Materials . 32
B.4 Piping . 33
B.5 Pumps . 33
B.6 Heat exchanger . 33
B.7 Safety and control system . 34
B.7.1 General . 34
B.7.2 HTF and MSF leak detection system . 34
B.7.3 Instrumentation . 34
B.7.4 Freeze protection system . 34
B.7.5 Molten salt valves . 36
B.7.6 Blanketing system . 36
B.7.7 Welding control system . 36
B.8 Melting system . 36
Annex C (normative) Data adquisition and treatment . 38
C.1 Flow signal measurement . 38
C.2 Temperature signals measurement . 41
Annex D (informative) Documentation to be provided by the TES
manufacturer/supplier . 44
Annex E (normative) Test report . 46
Bibliography . 48
Figure 1 – Agreed duration between two charges . 16
Figure 2 – General typical diagram of the system and test boundaries for indirect TES
systems . 17
Figure 3 – General typical diagram of the system and test boundaries for direct TES
systems . 18
Figure 4 – Examples of criteria for comparison of the measurement (M) and the
reference value (RV) . 27
– 4 – IEC TS 62862-2-1:2021 © IEC 2021
Table 1 – List of symbols and units . 9
Table 2 – List of subscripts, superscripts and abbreviated terms . 9
Table 3 – Levels of confidence and associated coverage factors (Gaussian
distribution) . 26
Table C.1 – Cri
...