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Design of a hybrid Ocean Thermal Energy Conversion with Solar Thermal Energy (OTEC-STE) system for energy production(case study: Oman sea region)

Zakipour, Mohammad Mehdi | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51165 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani Fard, Majid
  7. Abstract:
  8. The ocean thermal energy conversion system is one of a variety of renewable marine energy that is made up of a thermodynamic cycle, and it uses the difference between the temperature of hot water at the ocean surface and cold water at the depths of the ocean to generate electricity. The closed cycle is one type in which the system uses a working fluid which its boiling point less than the boiling point of water. Increasing the temperature of the fluid inlet in the cycle increases the system efficiency, which has been applied in this study to increase the efficiency of the OTEC system. The required energy to increase this temperature has been achieved by adding a solar collector to this system.The net output power and system efficiency were obtained from a code written in C++ language. This code was completed by adding the case of a parabolic solar collector in order to increase the thermal efficiency this hybrid system. The solar collector can help to increase the energy input entering hot water and there for help to increase the total efficiency. According to this study, addition of a 1400-meter-long solar collector, the efficiency of the OTEC system has increased from 2.3 to 3.8 percent and the net output power has increased from 69.2 kilowatt to 87.62 kilowatts. In super heat mode, the thermal energy received from the solar collector was transferred to the OTEC operating fluid and increased the system efficiency from 2.3 to 17.23 percent and the net output power from 69.2 to 618.29 kilowatts.The operation of the OTEC system is carried out by both coastal and floating systems. According to the case study of this research, the floating platforms have been selected as a hosting facility for OTEC system equipment. With regard to the area required for the solar collector, the semi-floating platforms of Amir-Kabir and the ISSC TLP were selected for comparison. In the discussion of the optical efficiency of the solar collector, the solar radiation angle is one of the most important factors in increasing the collector efficiency. By analyzing the rotational motion of the two platforms, the ISSC platform was selected as the appropriate platform for hosting equipment installation
  9. Keywords:
  10. Offshore Platforms ; Thermodynamic Cycle ; Renewable Energy Resources ; Solar Thermal ; Ocean Energy ; Oman Sea ; Ocean Thermal Energy Conversion

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