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Subsea Cooling for Offshore WindIndustry-Science Meetup at UiO
05/12/2019
Ivar Espedal
Project Manager
FUTURE TECHNOLOGY
OIL & GAS
• Technical Safety
• SIL and HSE• Flow Assurance
POWER SYSTEMS
• Offshore & Onshore Wind
• Distribution & interconnection
• Power system design and analysis
INFRASTRUCTURE
• Safety, Risk, Health coordination
• HSEQ Managment system• RAMS• Construction Client Regulations
• The oil and gas industry wanted a more cost
effective and efficient cooling technology
• FT had the ideas and competence
• Offshore wind has emerged as an alternative marked
• Industry and government support
• 38 MNOK used so far in development
FSCC – An optimized subsea cooler
FSCC design is simple and uses well known principles
• Cooler design based on maximum required cooling
• Actual cooling adjusted by using the bypass line
• Patent granted (Automatic chemical injection)
Optimal distance yields 25-40% increase in external
heat transfer rate
Concept
• Long step-outs require AC/DC conversion• AC/DC conversion generates significant heat
Heat
The offshore wind challenge
The open seawater cooling system is characterized by:
The closed loop FSCC cooling system provides:
• Passive - No power consumption
• Closed loop - No possibility for clogging, and no emmissions
• No moving parts - Minimised need for maintenance and repairs
• Reduced complexity - Increased overall robustness of the cooling system
• High power consumption
• Susceptible to clogging due to fouling, sand and mud
• Frequent and extensive maintenance needs
• High costs and poor reliability
Conventional cooling system vs. FSCC
• SIMCOOL is a flexible tool to design FSCC
• SIMCOOL enables detailed design output and optimization of FSCC
• SIMCOOL is based on the knowledge from years of experimental and numerical research
• SIMCOOL is qualified by full scale prototype testing
SIMCOOL
Qualified FSCC performance and SIMCOOL accuracy
SIMCOOL is accurate, and conservative. Performance is higher than calculated in strong seacurrents.
Strong sea currents
CONFIDENTIALTest Results vs. SIMCOOL
COOLER EVALUATION AND TESTING
2014: SIMCOOL™ developed - Avoids the need for cumbersome CFD analysis in design.
2015: Full-scale prototype testing of FSCC® and verification of SIMCOOL. Over 7000 tests performed.
2016: Various materials and coating systems exposed subsea to investigate marine growth. (13 months) 2
01
8
© UiO/Hans Fredrik Asbjørnsen
2017: Testing of pipe materials and coating to evaluate the effect of bio-fouling. (10 months exposure)
2018: Cooler pipe and reference pipe exposed and monitored with hot fluid circulation on offshore platform (2+2 months)
FSCC® has been rigorously tested and evaluated over a 5-year period.
COOLWIND
• The goal of the COOLWIND project is to get a coolerunit installed and operating on a live HVDC platform
• Parallell system as a pilot
• Enables full-scale subsea systems on future projects
• High interest among operators
• 2.5 M€ grant by the European Union from theHorizon 2020 program
