IEC TS 62600-20:2019
(Main)Marine energy - Wave, tidal, and other water current converters - Part 20: Design and analysis of an Ocean Thermal Energy Conversion (OTEC) plant - General guidance
Marine energy - Wave, tidal, and other water current converters - Part 20: Design and analysis of an Ocean Thermal Energy Conversion (OTEC) plant - General guidance
IEC TS 62600-20:2019 establishes general principles for design assessment of OTEC plants. The goal is to describe the design and assessment requirements of OTEC plants used for stable power generation under various conditions. This electricity may be used for utility supply or production of other energy carriers. The intended audience is developers, engineers, bankers, venture capitalists, entrepreneurs, finance authorities and regulators.
This document is applicable to land-based (i.e. onshore), shelf-mounted (i.e. nearshore seabed mounted) and floating OTEC systems. For land-based systems the scope of this document ends at the main power export cable suitable for connection to the grid. For shelf-mounted and floating systems, the scope of this document normally ends at the main power export cable where it connects to the electrical grid.
This document is general and focuses on the OTEC specific or unique components of the power plant, particularly the marine aspects of the warm and cold water intake systems. Other established standards are referenced to address common components between the OTEC system and other types of power plants and floating, deep water oil and gas production vessels, such as FPSOs and FLNG systems. Relevant standards are listed within this document as appropriate.
General Information
Standards Content (Sample)
IEC TS 62600-20 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal, and other water current converters –
Part 20: Design and analysis of an Ocean Thermal Energy Conversion (OTEC)
plant – General guidance
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IEC TS 62600-20 ®
Edition 1.0 2019-06
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal, and other water current converters –
Part 20: Design and analysis of an Ocean Thermal Energy Conversion (OTEC)
plant – General guidance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.140 ISBN 978-2-8322-6915-2
– 2 – IEC TS 62600-20:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 13
4 Abbreviated terms and acronyms . 15
5 Site specific and metocean design parameters . 15
5.1 Environmental factors influencing design . 15
5.1.1 General . 15
5.1.2 Seawater temperature . 16
5.1.3 Wind . 16
5.1.4 Waves . 16
5.1.5 Water depth and sea level variations . 17
5.1.6 Currents . 17
5.1.7 Marine growth . 17
5.1.8 Other meteorological and oceanographic information . 17
5.1.9 Water chemistry . 17
5.1.10 Third party (collision, anchor impact, trawling, Unexploded Ordinance
(UXO) . 17
5.1.11 Soil/seabed conditions . 18
5.2 Biological impact . 18
6 Floating OTEC – General information and guidance (closed cycle, deep water) . 18
6.1 Seawater considerations . 18
6.2 Cold seawater system . 19
6.2.1 Systems engineering considerations . 19
6.2.2 Cold water pumping power considerations . 20
6.2.3 CWP dynamic response . 20
6.2.4 Static Loads and bending moments . 21
6.2.5 Suction collapse . 21
6.2.6 Deflection by current and platform motions . 21
6.2.7 Analysis of loads and displacements . 22
6.2.8 Recommendations for qualification of the Cold Water Pipe (CWP) . 22
6.2.9 Analysis approach . 22
6.3 Warm seawater system . 22
6.3.1 Warm water intake (screen) . 22
6.3.2 Warm water ducting and pumps . 23
6.3.3 Biofouling control . 23
6.4 Seawater discharge arrangement and plume analysis . 23
6.4.1 Seawater discharge ducts . 23
6.4.2 Seawater pumps . 23
7 Process system . 24
7.1 Working fluid selection . 24
7.2 Heat exchanger (HX) selection . 25
7.3 Materials compatibility . 25
7.4 Process system risks and hazards . 25
8 Platform type . 25
8.1 General . 25
8.2 Mooring/Station keeping . 26
8.2.1 Grazing OTEC plants (no power export cable required) . 26
8.2.2 Non-grazing OTEC plants . 26
9 Power export . 27
9.1 General . 27
9.2 Design considerations . 27
9.3 Platform based equipment . 27
9.4 Transmission cable . 27
9.5 Land based equipment . 28
10 Energy storage and transfer system . 28
10.1 General . 28
10.2 Hydrogen . 28
10.3 Ammonia . 28
10.4 Methanol . 28
10.5 Battery storage . 28
11 Land and shelf-based OTEC . 29
11.1 General information and guidance. 29
11.2 CWP design for land and shelf-based OTEC plants . 29
12 Risk based approach for the design and operations of OTEC plants . 30
12.1 Risk assessment . 30
12.2 Risk based design. 30
12.2.1 Risk assessment process . 30
12.2.2 Prototype testing . 31
12.3 Risk based operational guidelines . 31
12.3.1 Floating plant . 31
12.3.2 Operating plant . 31
12.3.3 Product export risks/hazards . 31
13 Transportation and installation (T&I) . 32
14 Commissioning and handover . 32
15 Operations, inspection and maintenance . 33
15.1 General . 33
15.2 Operations . 33
15.3 Inspection and maintenance . 34
15.4 Hazards and safety . 35
15.4.1 Hazards . 35
15.4.2 Safety . 35
16 Decommissioning . 36
Annex A (informative) OTEC potential and its history . 38
A.1 OTEC potential . 38
A.2 Installation sites . 39
A.3 Previous OTEC projects . 39
A.4 Open cycle OTEC . 40
Bibliography . 41
Figure 1 – Tropical ocean temperature-depth profile . 7
Figure 2 – Working principle of closed cycle ocean thermal energy conversion [2] . 8
– 4 – IEC TS 62600-20:2019 © IEC 2019
Figure 3 – Major power cycle components of a closed cycle OTEC plant . 9
Figure 4 – Open cycle OTEC system . 10
Figure 5 – Example of a typic
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