skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: OTEC Advanced Composite Cold Water Pipe: Final Technical Report

Abstract

Ocean Thermal Energy Conversion can exploit natural temperature gradients in the oceans to generate usable forms of energy (for example, cost-competitive baseload electricity in tropical regions such as Hawaii) free from fossil fuel consumption and global warming emissions.The No.1 acknowledged challenge of constructing an OTEC plant is the Cold Water Pipe (CWP), which draws cold water from 1000m depths up to the surface, to serve as the coolant for the OTEC Rankine cycle. For a commercial-scale plant, the CWP is on the order of 10m in diameter.This report describes work done by LMSSC developing the CWP for LM MS2 New Ventures emerging OTEC business. The work started in early 2008 deciding on the minimum-cost CWP architecture, materials, and fabrication process. In order to eliminate what in previous OTEC work had been a very large assembly/deployment risk, we took the innovative approach of building an integral CWP directly from theOTEC platform and down into the water. During the latter half of 2008, we proceeded to a successful small-scale Proof-of-Principles validation of the new fabrication process, at the Engineering Development Lab in Sunnyvale. During 2009-10, under the Cooperative Agreement with the US Dept. of Energy, we have now successfully validated key elementsmore » of the process and apparatus at a 4m diameter scale suitable for a future OTEC Pilot Plant. The validations include: (1) Assembly of sandwich core rings from pre-pultruded hollow 'planks,' holding final dimensions accurately; (2) Machine-based dispensing of overlapping strips of thick fiberglass fabric to form the lengthwise-continuous face sheets, holding accurate overlap dimensions; (3) Initial testing of the fabric architecture, showing that the overlap splices develop adequate mechanical strength (work done under a parallel US Naval Facilities Command program); and (4) Successful resin infusion/cure of 4m diameter workpieces, obtaining full wet-out and a non-discernable knitline between successive stepwise infusions.« less

Authors:
;
Publication Date:
Research Org.:
Lockheed Martin MS2
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1024183
Report Number(s):
Final Technical Report
TRN: US201201%%888
DOE Contract Number:  
FC36-08GO18172
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; 14 SOLAR ENERGY; 30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; 42 ENGINEERING; BUSINESS; COOLANTS; DIMENSIONS; ELECTRICITY; FABRICATION; FIBERGLASS; FOSSIL FUELS; GREENHOUSE EFFECT; OCEAN THERMAL ENERGY CONVERSION; PILOT PLANTS; RANKINE CYCLE; RESINS; TEMPERATURE GRADIENTS; TESTING; TROPICAL REGIONS; VALIDATION; WATER; Cold Water Pipe, Ocean Thermal Energy Conversion, OTEC, CWP, Composites, Fabrication, Large Diameter

Citation Formats

Dr. Alan Miller, and Matthew Ascari. OTEC Advanced Composite Cold Water Pipe: Final Technical Report. United States: N. p., 2011. Web. doi:10.2172/1024183.
Dr. Alan Miller, & Matthew Ascari. OTEC Advanced Composite Cold Water Pipe: Final Technical Report. United States. doi:10.2172/1024183.
Dr. Alan Miller, and Matthew Ascari. Mon . "OTEC Advanced Composite Cold Water Pipe: Final Technical Report". United States. doi:10.2172/1024183. https://www.osti.gov/servlets/purl/1024183.
@article{osti_1024183,
title = {OTEC Advanced Composite Cold Water Pipe: Final Technical Report},
author = {Dr. Alan Miller and Matthew Ascari},
abstractNote = {Ocean Thermal Energy Conversion can exploit natural temperature gradients in the oceans to generate usable forms of energy (for example, cost-competitive baseload electricity in tropical regions such as Hawaii) free from fossil fuel consumption and global warming emissions.The No.1 acknowledged challenge of constructing an OTEC plant is the Cold Water Pipe (CWP), which draws cold water from 1000m depths up to the surface, to serve as the coolant for the OTEC Rankine cycle. For a commercial-scale plant, the CWP is on the order of 10m in diameter.This report describes work done by LMSSC developing the CWP for LM MS2 New Ventures emerging OTEC business. The work started in early 2008 deciding on the minimum-cost CWP architecture, materials, and fabrication process. In order to eliminate what in previous OTEC work had been a very large assembly/deployment risk, we took the innovative approach of building an integral CWP directly from theOTEC platform and down into the water. During the latter half of 2008, we proceeded to a successful small-scale Proof-of-Principles validation of the new fabrication process, at the Engineering Development Lab in Sunnyvale. During 2009-10, under the Cooperative Agreement with the US Dept. of Energy, we have now successfully validated key elements of the process and apparatus at a 4m diameter scale suitable for a future OTEC Pilot Plant. The validations include: (1) Assembly of sandwich core rings from pre-pultruded hollow 'planks,' holding final dimensions accurately; (2) Machine-based dispensing of overlapping strips of thick fiberglass fabric to form the lengthwise-continuous face sheets, holding accurate overlap dimensions; (3) Initial testing of the fabric architecture, showing that the overlap splices develop adequate mechanical strength (work done under a parallel US Naval Facilities Command program); and (4) Successful resin infusion/cure of 4m diameter workpieces, obtaining full wet-out and a non-discernable knitline between successive stepwise infusions.},
doi = {10.2172/1024183},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {9}
}