Model Basin Tests of Ocean Wave Responses for a 40-MW OTEC Pilot Plant

1982 ◽  
Vol 104 (1) ◽  
pp. 46-51 ◽  
Author(s):  
J. F. George ◽  
D. Richards
Keyword(s):  
Puerto Rico ◽  
Pilot Plant ◽  
Additional Data ◽  
Cold Water ◽  
Green Water ◽  
Scale Model ◽  
Water Pipe ◽  
Stability Margins ◽  
Mooring Forces ◽  
Wave Conditions

A 1/30th-scale model of a floating 40-MW OTEC pilot plant has been subjected to wave conditions that the prototype would experience as a plant moored off Puerto Rico or Hawaii, or as a cruising plantship in the South Atlantic Ocean east of Brazil. The model, in its unmodified baseline configuration, survived the design wave conditions for the three sites, with more than adequate stability margins. A modified configuration was also tested to reduce the possibility of taking on “green water” which was a concern at the Puerto Rico and Hawaii sites. Additional data were obtained on seawater system parameters, cold water pipe motions, and mooring forces.

Studies of Cold Water Pipe Installation for OTEC Pilot Plant in Tahiti

1984 ◽  
Author(s):  
R. Vilain ◽  
J. Elcano ◽  
F. Mathieu ◽  
A. Vitalis
Keyword(s):  
Pilot Plant ◽  
Cold Water ◽  
Water Pipe

Analysis of Coupled Hull: Cold Water Pipe Mooring for Offshore Desalination Plant

2007 ◽  
Author(s):  
A. Venkata Subbaiah ◽  
R. Sundaravadivelu ◽  
V. Anantha Subramanian
Keyword(s):  
Cold Water ◽  
Numerical Study ◽  
Scale Model ◽  
Coupled Analysis ◽  
Water Pipe ◽  
Ocean Engineering ◽  
Wave Condition ◽  
Desalination Plant ◽  
Tension Response ◽  
Wave Basin

The design of a 0.25 Million Litres per Day (MLD) low pressure desalination plant in 150m water depth using a Tension Leg Counterweight Platform (TLCP) consisting of a 10m diameter hull, 1m diameter cold water pipe with counterweight and vertical taut mooring has been carried out. A 1:50 scale model of the TLCP is tested in the 30m × 30m × 3m wave basin in Department of Ocean Engineering, IIT Madras. The tensions in mooring lines are measured using load cells. The coupled analysis of the TLCP is studied using the Nonlinear Analysis of Offshore Structures (NAOS) program developed at IIT MADRAS. The measured tension response of mooring line compare well with numerical results. The Surge, Heave, Pitch and Tension response amplitude operators for the TLCP obtained from numerical study are observed to be within the permissible limits for the operational wave condition whereas the TLCP performs satisfactorily for the survival wave condition. The numerical and model studies are carried out for regular waves. The effect of counterweight and pretension on platform motions is studied in this paper.

Preliminary Design of a 1-MWe OTEC Test Plant

1982 ◽  
Vol 104 (1) ◽  
pp. 3-8 ◽  
Author(s):  
T. Kajikawa
Keyword(s):  
Cold Water ◽  
Working Fluid ◽  
Test Plant ◽  
Mooring System ◽  
Preliminary Design ◽  
Closed Cycle ◽  
Water Pipe ◽  
Thermal Energy Conversion ◽  
Design Value ◽  
Ocean Thermal Energy

An ocean-based, 1-MWe (gross) test plant has been planned to establish the feasibility of OTEC (ocean thermal energy conversion) power generation in the revised Sunshine Project. The preliminary design of the proposed test plant employs a closed-cycle power system using ammonia as the working fluid on a barge-type platform with a rigid-arm-type, detachable, single-buoy mooring system. Two types each of titanium evaporators and condensers are to be included. The steel, cold-water pipe is suspended from the buoy. The design value of the ocean temperature difference is 20 K. The paper presents an overview of the preliminary design of the test plant and the tests to be conducted.

OTEC-1 Cold Water Pipe Recovery Engineering of Lift and Towing Systems

1984 ◽  
Author(s):  
D. Tracy ◽  
G. Tettlebach ◽  
T. McNatt
Keyword(s):  
Cold Water ◽  
Water Pipe

Computational Study of Conjugate Heat Transfer in T-Junctions

2009 ◽  
Author(s):  
Simon Kuhn ◽  
Bojan Nicˇeno ◽  
Horst-Michael Prasser
Keyword(s):  
Thermal Fatigue ◽  
Nuclear Power ◽  
Power Plants ◽  
Cold Water ◽  
Computational Study ◽  
Solid Wall ◽  
Turbulent Viscosity ◽  
Life Time ◽  
Scale Model ◽  
Piping Systems

Thermal fatigue is a relevant problem in the context of life-time extension of nuclear power plants (NPP). In many piping systems in NPPs hot and cold water is mixed, which leads to high temperature fluctuations in the region close to the solid wall and resulting thermal loads on the pipe walls that can cause fatigue. One of the relevant geometric test cases for thermal fatigue is the mixing in T-junctions. In this study we apply large–eddy simulations (LES) to the mixing of hot and cold water in a T-junction. We perform a set of simulations by using different formulations of the LES subgrid scale model, i.e. standard Smagorinsky and dynamic procedure, to identify the influence of the modelled subgrid scales on the simulation results. The results exhibit a large difference between the models, which is caused by the use of turbulent viscosity wall–damping functions when applying the standard model.

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