Abstract
Abstract The article presents the results of the analysis of energy conversion cycles making use of thermal energy of oceans. The objects of analysis were two cases of closed Organic Rankine Cycle (ORC) power plants, which were: the cycle in which the vapour of the working medium was produced by warm oceanic water in the circum-equatorial zone, and the so-called “arctic” cycle in which this vapour was produced by non-frozen water in the circumpolar zone. Between ten and twenty low-boiling media were examined for which operating parameters were optimised to obtain the highest cycle efficiency. A preliminary design of an ORC turbine which was obtained by optimising basic design parameters is included. It has been proved that realisation of the Ocean Thermal Energy Conversion (OTEC) cycle is possible both in the warm and permanently frozen regions. The results of the calculations have also revealed that the efficiency of the OTEC cycle is higher in the circumpolar zone. Selecting a low-boiling medium and designing a highly efficient turbine operating in both abovementioned regimes is technically realisable.
Highlights
Seas and oceans are the world largest reservoirs in which thermal energy of sunbeams is accumulated
Within the framework of the present analysis, calculations were performed for the closed Ocean Thermal Energy Conversion (OTEC) cycle working in conditions characteristic for circum-equatorial regions
It is optimistically estimated that the resources of thermal energy are so high that they can meet all current power requirements of the human society
Summary
Seas and oceans are the world largest reservoirs in which thermal energy of sunbeams is accumulated. Due to huge mass flow rates and high requirements for warm and cold water, remarkable part of the produced electric energy is used for covering own needs of the installation, mainly connected with pump feeding.
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