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International Journal of Computer and Electrical Engineering, Vol. 5, No. 2, April 2013 Energy-Economic Analysis and Configuration Design of the Kalina Solar-OTEC System Faming Sun, Weisheng Zhou, Kenichi Nakagami, and Xuanming Su Abstract—Based on one of the typical low-grade thermal power cycles, Kalina cycle, the solar auxiliary boosted ocean thermal energy conversion (Kalina Solar-OTEC) system is proposed in the paper. To utilize solar energy in the Solar-OTEC system with high performance and low cost, three kinds of configurations by acting same solar heat transfer rate on different part of the Solar-OTEC system are designed and discussed here. Meanwhile, the corresponding calculation model is built to compare their performance. Results show that Kalina Solar-OTEC in case 1 has better thermodynamics and economic performance than other cases. Index Terms—Energy-Economic analysis, kalina cycle, solar-otec, thermal power generation. I. INTRODUCTION performance to reduce the electricity cost. Kalina use an ammonia-water mixture as the working fluid in their cycle, which have been developed and reported to have better performance than the Rankine cycle at same temperature difference [5]. Thus, Kalina cycle is considered as one promising way to be used in OTEC. In addition, since the solar energy is also abundant in the districts with rich ocean thermal energy [6]. Therefore, the solar energy should be taken into consideration as the additional heating source to improve the efficiency of the OTEC. Thus, recently, many researchers devote themselves to study the Solar-OTEC [7]-[11]. All their results suggested that Solar-OTEC may be an effective way to improve feasibility of the power generation system. In summary, although many studies described that the combination of OTEC with solar energy could be a possible way to improve the availability of the cycle, however the high-efficiency utilization of solar energy in OTEC system is scarcely considered even though it is significant for designing high performance Solar-OTEC system in engineering practice. It prompts us to carry out the present study. In this study, the Kalina Solar-OTEC is firstly proposed. And then, by exerting solar energy to different part of Solar-OTEC system, three kinds of configuration cases are analyzed and compared from the point of view of thermodynamic and economic analysis. Finally, the way of designing high performance hybrid configuration of the Kalina Solar-OTEC system will be clarified. BASIC PARAMETERS AND GENERAL ASSUMPTION Energy shortage and environmental pollution are two critical issues in this century that must be appropriately solved to produce new energy and at the same time to reduce emissions. Renewable energy is being considered as a more promising way for it, and offering an excellent opportunity to supply clean electricity with a non-CO2 emitting technology. Especially after the Fukushima nuclear accident in Japan, renewable energy is got a growing respect in the world. It is the energy which comes from natural resources such as sunlight, ocean thermal gradients, wind, rain, tides, and geothermal heat, etc. Recently, under the government policy guidance, ocean thermal energy has attracted more and more attentions. Numerous efforts have been paid to try to use it to generate electricity, or ocean thermal energy conversion (OTEC). II. OTEC is a power system which generates electricity using the temperature difference between sea surface and deep-sea [1]. In the past few decades, research attentions have focused on the development of OTEC. And ammonia is reported as one of the suitable working fluids for a closed Rankine cycle OTEC plant from the view point of the net power output [2]-[4]. However, its performance is limited since the available temperature difference is small for OTEC, which leads to a high cost of the electricity. Therefore, many researchers devote themselves to improving the cycle Manuscript received October 16, 2012; revised November 24, 2012. This work was financial supported by the AY2012 Research Promotion Program (Young Scientist) (Ritsumeikan University). F. M. Sun is with the R-GIRO, Ritsumeikan University, Kyoto, Japan (e-mail: sunfamingjia@gmail.com or sunfmjia@fc.ritsumei.ac.jp). W. S. Zhou and K. Nakagami are with College of Policy Science, Ritsumeikan University, Kyoto, Japan (e-mail: zhou@sps.ritsumei.ac.jp, nakagami@sps.ritsumei.ac.jp). X. M. Su is with the R-GIRO, Ritsumeikan University, Kyoto, Japan (e-mail: xuanming@fc.ritsumei.ac.jp). Fig. 1. Sketch of the Kalina Solar-OTEC system DOI: 10.7763/IJCEE.2013.V5.692 187PDF Image | Energy-Economic Analysis and Configuration Design of the Kalina Solar-OTEC System
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