کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1725363 1520686 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
LNG as cold heat source in OTEC systems
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
پیش نمایش صفحه اول مقاله
LNG as cold heat source in OTEC systems
چکیده انگلیسی


• LNG to decrease the cold source temperature in OTEC plants has been investigated.
• Recovery of energy from LNG vaporization has been studied.
• Correspondent improvements of OTEC thermal efficiency have been quantified.
• Two cycles in cascade have been proposed to promote LNG vaporization.
• Preliminary economical and environmental analysis has been carried out.

In Ocean Thermal Energy Conversion systems (OTEC), the production of electric energy is achieved in tropical areas exploiting the warmer surface seawater as hot source for the vaporization of a specific working fluid, and the coldest water pumped from the depths for its condensation. These systems are very expensive due to both the required large infrastructures and the limited values of thermal efficiency. To reduce the payback period of investment costs, greater values of thermal efficiency are recommended and they could be obtained by an augment of the temperature difference between the two heat sources. In this paper the possibility of using Liquid Natural Gas (LNG) stored at atmospheric pressure and temperature of 113 K in regasification terminals is investigated. With reference to data concerning an LNG regasification plant designed for Gioia Tauro (Southern Italy), the energy performances of a novel OTEC system which operates through two thermodynamic cycles in cascade, using pure ammonia and LNG as working fluids, were evaluated. The proposed plant allows an increase of the electric power recovering the LNG exergy during the gasification process and, at the same time, guarantees the complete gasification of LNG for the immission in the gas pipeline network.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 104, 1 August 2015, Pages 349–358
نویسندگان
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