Optimization design and exergy analysis of organic rankine cycle in ocean thermal energy conversion

Sun, Fengrui; Ikegami, Yasuyuki; Jia, Bingrui; Arima, Hirofumi

doi:10.1016/j.apor.2011.12.006

Cited by 102 publications

(32 citation statements)

References 17 publications

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“…Recently, experimental research has been resumed and pilot plants have been built, utilizing ammonia as the working fluid in a saturated cycle configuration [197]. An ORC system utilizing a refrigerant or a hydrocarbon as working fluid are options, compared to the more conventional and studied ammonia Rankine cycle OTEC plant or to the potentially more efficient Kalina or Uheara cycle power plants [197][198][199]. Note that the ammonia-water mixture implies a lower heat transfer coefficient than that of pure fluids, thus possibly much larger heat exchangers.…”

Section: Ocean Thermal Energy Conversion (Otec)mentioning

confidence: 99%

Organic Rankine Cycle Power Systems: From the Concept to Current Technology, Applications, and an Outlook to the Future

Colonna

Casati

Trapp

et al. 2015

Journal of Engineering for Gas Turbines and Power

311

190

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The cumulative global capacity of organic Rankine cycle (ORC) power systems for the conversion of renewable and waste thermal energy is undergoing a rapid growth and is estimated to be approx. 2000 MW e considering only installations that went into operation after 1995. The potential for the conversion of the thermal power coming from liquiddominated geothermal reservoirs, waste heat from primary engines or industrial processes, biomass combustion, and concentrated solar radiation into electricity is arguably enormous. ORC technology is possibly the most flexible in terms of capacity and temperature level and is currently often the only applicable technology for the conversion of external thermal energy sources. In addition, ORC power systems are suitable for the cogeneration of heating and/or cooling, another advantage in the framework of distributed power generation. Related research and development is therefore very lively. These considerations motivated the effort documented in this article, aimed at providing consistent information about the evolution, state, and future of this power conversion technology. First, basic theoretical elements on the thermodynamic cycle, working fluid, and design aspects are illustrated, together with an evaluation of the advantages and disadvantages in comparison to competing technologies. An overview of the long history of the development of ORC power systems follows, in order to place the more recent evolution into perspective. Then, a compendium of the many aspects of the state of the art is illustrated: the solutions currently adopted in commercial plants and the main-stream applications, including information about exemplary installations. A classification and terminology for ORC power plants are proposed. An outlook on the many research and development activities is provided, whereby information on new high-impact applications, such as automotive heat recovery is included. Possible directions of future developments are highlighted, ranging from efforts targeting volume-produced stationary and mobile mini-ORC systems with a power output of few kW e , up to large MW e base-load ORC plants.

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Section: Ocean Thermal Energy Conversion (Otec)mentioning

confidence: 99%

Organic Rankine Cycle Power Systems: From the Concept to Current Technology, Applications, and an Outlook to the Future

Colonna

Casati

Trapp

et al. 2015

Journal of Engineering for Gas Turbines and Power

311

190

View full text Add to dashboard Cite

show abstract

“…The study presents a sensitivity analysis that shows the role of heat exchangers in an OTEC cycle as well as the importance of optimizing them or developing more suitable ones. Sun et al reached the same results in their optimization design and exergy analysis of an organic Rankine cycle [18]. Bernardoni et al realized a techno-economic analysis of a closed OTEC cycle to assess its levelized cost of energy (LCOE) [16].…”

Section: Introductionmentioning

confidence: 86%

OTEC Maximum Net Power Output Using Carnot Cycle and Application to Simplify Heat Exchanger Selection

Fontaine

Yasunaga

Ikegami

2019

Entropy

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Ocean thermal energy conversion (OTEC) uses the natural thermal gradient in the sea. It has been investigated to make it competitive with conventional power plants, as it has huge potential and can produce energy steadily throughout the year. This has been done mostly by focusing on improving cycle performances or central elements of OTEC, such as heat exchangers. It is difficult to choose a suitable heat exchanger for OTEC with the separate evaluations of the heat transfer coefficient and pressure drop that are usually found in the literature. Accordingly, this paper presents a method to evaluate heat exchangers for OTEC. On the basis of finite-time thermodynamics, the maximum net power output for different heat exchangers using both heat transfer performance and pressure drop was assessed and compared. This method was successfully applied to three heat exchangers. The most suitable heat exchanger was found to lead to a maximum net power output 158% higher than the output of the least suitable heat exchanger. For a difference of 3.7% in the net power output, a difference of 22% in the Reynolds numbers was found. Therefore, those numbers also play a significant role in the choice of heat exchangers as they affect the pumping power required for seawater flowing. A sensitivity analysis showed that seawater temperature does not affect the choice of heat exchangers, even though the net power output was found to decrease by up to 10% with every temperature difference drop of 1 °C.

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“…7 shows the comparison of theoretical and experimental results on temperature difference between heating and cooling source. The theoretical research conducted by Faming Sun et al [19] was selected to compare with current work. The results showed that the theoretical thermal efficiency of both the R134-a based power cycle and current ammonia water based one saw the same trend.…”

Section: Mathematical Modelmentioning

confidence: 99%

Experimental investigation on an ammonia-water based ocean thermal energy conversion system

Yuan¹,

Mei²,

Hu³

et al. 2013

Applied Thermal Engineering

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Optimization design and exergy analysis of organic rankine cycle in ocean thermal energy conversion

Cited by 102 publications

References 17 publications

Organic Rankine Cycle Power Systems: From the Concept to Current Technology, Applications, and an Outlook to the Future

Organic Rankine Cycle Power Systems: From the Concept to Current Technology, Applications, and an Outlook to the Future

OTEC Maximum Net Power Output Using Carnot Cycle and Application to Simplify Heat Exchanger Selection

Experimental investigation on an ammonia-water based ocean thermal energy conversion system

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