Performance analysis of OTEC power cycle with a liquid–vapor ejector using R32/R152a

Yoon, Jung-In; Son, Chang-Hyo; Seol, Sung-Hoon; Kim, Hyeon-Uk; Ha, Soo-Jung; Kim, Hyeon-Ju

doi:10.1007/s00231-015-1526-2

Cited by 22 publications

(5 citation statements)

References 12 publications

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“…The improvement of thermal efficiency results in an increase in the net power output while simultaneously resulting in a decrease in the heat load of the heat exchanger, the size of the main component, and the capital cost of building a power station [19]. As a result, a significant amount of research has been carried out in recent years to improve the thermal efficiency of the OTEC cycle through modifications to the cycle, the refrigerant, and the components [20].…”

Section: Thermodynamics Analysis Of Solar-ejector Pump Otec (Sep-otec...mentioning

confidence: 99%

“…The isentropic enthalpy was calculated using equation 14, while the actual enthalpy can be calculated using the primary nozzle efficiency equation (equation 15). Using the mass balance equation and the energy balance equation (equations 16 and 17), an iterative computational process was used to adjust the primary nozzle outlet and then the calculated velocities were compared to ensure the properties obeyed one another (see equation [18][19][20]…”

Section: Parameter Value Authormentioning

confidence: 99%

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Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

Suruji,

Nasir,

Nik Mohd

et al. 2023

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Organic Rankine Cycle (ORC) applications include ocean thermal energy conversion (OTEC), in which mechanical work is generated from heat energy to rotate generators and generate electricity. The OTEC system heated and cooled its refrigerant by taking advantage of the relatively small temperature difference between the warmer surface seawater and the colder deep seawater. The low-temperature difference between seawater and the rest of the system meant that the thermal efficiency of the system was relatively low; to address this problem, the OTEC cycles needed to be revised. To increase the basic OTEC cycle's thermal efficiency by 3.3–4.0%, various modifications have been developed. Two such cycles are the Solar Boosted OTEC (SOTEC) cycle and the Ejector Pump cycle (EP-OTEC). While the two improvements alter the rotating turbine parameters in different ways, they can be combined to create an improved OTEC cycle through the use of thermodynamics. In this study, an algorithm for revised OTEC was developed using MATLAB, and the performance of the system after the modifications was further quantified. This SEP-OTEC cycle thermal efficiency gives a 1.2-fold improvement when compared to the previous OTEC cycle thermal efficiency, which was 3.1%.

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Section: Thermodynamics Analysis Of Solar-ejector Pump Otec (Sep-otec...mentioning

confidence: 99%

Section: Parameter Value Authormentioning

confidence: 99%

Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

Suruji,

Nasir,

Nik Mohd

et al. 2023

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“…The ORC unit included an additional composition control system which allowed it to operate with varying working fluid composition to suit the ambient conditions. Yoon et al [77] presented the performance analysis of a mixture power cycle using a vapour-liquid ejector and two expanders for ocean thermal energy conversion (OTEC) applications. The optimal fluid composition for maximum cycle efficiency was determined.…”

Section: Waste/exhaust Heat Recovery Orc Power Systemsmentioning

confidence: 99%

A review of recent research on the use of zeotropic mixtures in power generation systems

Modi

Haglind

2017

Energy Conversion and Management

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“…Te results show that the optimal composition of R1224y/(Z)/ R1243zf is 16 : 84, and the maximum thermal efciency of the cycle reaches about 4.25%, proving R1224yd(Z)/ R1243zf is an efcient working fuid that can replace pure NH 3 in the superheated state. Yoon et al [25] discussed the OTEC system with R32/R152a. Tey had improved the efciency of the system by 16% using liquid-steam ejectors.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of OTEC-ORC and Turbine Based on Binary Zeotropic Working Fluid

Huang

Gao

et al. 2023

International Journal of Chemical Engineering

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In this paper, the composition of binary nonazeotropic working fluids is explored from the perspective of improving OTEC-ORC efficiency, and the turbine is designed to accommodate with the working fluid. It is found that the OTEC-ORC using a R152a/R32 mixture as the working fluid is significantly higher than the OTEC-ORC thermal efficiency and system efficiency of the pure NH3, and the optimal composition of the mixed working fluid R152a/R32 is determined to be 85 : 15 with the thermal efficiency and the system efficiency of 2.8% and 1.7%, respectively, improving by 35.7% and 151.2% compared to the NH3 ORC. According to the determined working fluid, a one-dimensional (1-D) design and CFD simulation analysis simulation are carried out on the turbine. The 1-D calculation results are in good agreement with the three-dimensional (3-D) results. At the design point, the turbine output is 83.84 kW, and the isentropic efficiency is 87.53%. At the off-design point, turbines have better off-design performance, indicating that the designed turbine also has good adaptability.

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Performance analysis of OTEC power cycle with a liquid–vapor ejector using R32/R152a

Cited by 22 publications

References 12 publications

Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

Thermodynamics Analysis of Solar-Ejector Pump Otec (Sep-Otec) Rankine Cycle Using Ammonia as Refrigerant

A review of recent research on the use of zeotropic mixtures in power generation systems

Performance Improvement of OTEC-ORC and Turbine Based on Binary Zeotropic Working Fluid

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