Laboratory of Physical and Mathematical Engineering for Energy and Environment

Saint-Pierre, Reunion

Laboratory of Physical and Mathematical Engineering for Energy and Environment

Saint-Pierre, Reunion

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Sinama F.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Martins M.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Journoud A.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Marc O.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Lucas F.,Laboratory of Physical and Mathematical Engineering for Energy and Environment
Applied Ocean Research | Year: 2015

The ocean thermal energy conversion (OTEC) process uses the difference in temperature between the warm seawater on the ocean surface and the deep cold seawater to operate a Rankine cycle system for producing electrical power without consuming fossil fuel. This thermodynamic cycle uses a very low temperature gradient that limits its efficiency at 3-5%. Consequently every consumptions and losses of the system have to be optimized to increase the cost-effectiveness of this technology. This paper presents a thermodynamic analysis of a closed OTEC Rankine cycle. The model used in this paper is based on the work of Martins, using the concept of equivalent Gibbs systems. In an equivalent system, mass, energy and entropy are linked through the Gibbs equation, and the entropy production can easily be expressed in terms of fluxes and their related forces. Assuming linear phenomenological laws, the phenomenological coefficients are assessed from technical data. This method permits the study or design of a lot of process engineering. Moreover, a reliable analysis of the second principle can be realized, in order to compare several processes. This method will be used to analyze the cycle, to determine which components need to be optimized. Based on these results, sensitivity analysis are made on these components and the generic optimization program GenOpt is used to determine the optimized parameters of a 10. MW OTEC plant that could be installed on Reunion Island. © 2015 Elsevier Ltd.


Martins M.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Sinama F.,Laboratory of Physical and Mathematical Engineering for Energy and Environment | Lucas F.,Laboratory of Physical and Mathematical Engineering for Energy and Environment
International Journal of Energy Research | Year: 2013

SUMMARY: Reunion Island is heavily dependent on fossil fuels, but seeks to become energy self-sufficient by 2025. ocean thermal energy conversion provides a means of producing electricity that harnesses the available energy of the ocean by using the temperature gradient between its deep and its upper layers. This paper presents the projected experimental facility which is to be installed at the University of St. Pierre on Reunion Island. A dynamic model of the installation has been developed (on a Delphi interface) by using the concept of equivalent Gibbs systems. In such equivalent system, mass, energy, and entropy are linked through the Gibbs equation, and the entropy production can easily be expressed in terms of fluxes and their related forces. Assuming linear phenomenological laws, the phenomenological coefficients are assessed from technical data. Using a digital tool (Genopt), an optimization study has been conducted in order to determine the best operating parameters according to the temperature of the sea water. This model allows us to anticipate the potential of this technology on Reunion Island. Once validated on the facility, the model will serve as a tool to assist design of the future 10MW pilot plant planned for 2014. © 2012 John Wiley & Sons, Ltd.

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