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Estimates of global Ocean Thermal Energy Conversion (OTEC) resources using an ocean general circulation model

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  • Rajagopalan, Krishnakumar
  • Nihous, Gérard C.

Abstract

Global Ocean Thermal Energy Conversion (OTEC) resources are assessed for the first time with an ocean general circulation model (OGCM). Large-scale OTEC operations are represented with fluid sources and sinks of prescribed strength in global (4° × 4°) MITgcm simulations. Preliminary steady-state (time-asymptotic) results show similarities, but also significant differences with earlier one-dimensional (1-D) studies. It is confirmed that global OTEC resources are likely limited by OTEC flow effects on the stability of the vertical oceanic thermal structure. Such a limit is several times greater in a full three-dimensional context, however, with an estimated maximum annual OTEC net power production of about 30 TW. The significant OTEC flow rates corresponding to maximum net power output would result in a strong boost of the oceanic thermohaline circulation (THC). In contrast to simple 1-D analyses, the present simulations of large-scale OTEC operations also show a persistent cooling of the tropical oceanic mixed-layer. This would be balanced by a warming trend in the higher latitudes, which may practically limit OTEC deployment to smaller flow rates than at maximum net power output. An annual OTEC net power production of about 7 TW, for example, could be achieved with little effect on the oceanic temperature field.

Suggested Citation

  • Rajagopalan, Krishnakumar & Nihous, Gérard C., 2013. "Estimates of global Ocean Thermal Energy Conversion (OTEC) resources using an ocean general circulation model," Renewable Energy, Elsevier, vol. 50(C), pages 532-540.
    • Handle: RePEc:eee:renene:v:50:y:2013:i:c:p:532-540
    DOI: 10.1016/j.renene.2012.07.014
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