THERMODYNAMICS ANALYSIS OF SOLAR-EJECTOR PUMP OTEC (SEP-OTEC) RANKINE CYCLE USING AMMONIA AS REFRIGERANT
Keywords:OTEC, Rankine cycle, solar, ejector, Ammonia
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%.
Abdullah, W.S.W., M. Osman, M.Z.A. Ab Kadir, and R. Verayiah, The Potential and Status of Renewable Energy Development in Malaysia. Energies, 2019. 12(12): p. 2437.
Aleksandrowicz, L., R. Green, E.J.M. Joy, P. Smith, and A. Haines, The Impacts of Dietary Change on Greenhouse Gas Emissions, Land Use, Water Use, and Health: A Systematic Review. PLOS ONE, 2016. 11(11): p. e0165797.
Huzaifi, M., A. Budiyanto, and J. Sirait, Study on the Carbon Emission Evaluation in a Container Port Based on Energy Consumption Data. Evergreen, 2020. 7: p. 97-103.
Susskind, L., J. Chun, S. Goldberg, J.A. Gordon, G. Smith, and Y. Zaerpoor, Breaking Out of Carbon Lock-In: Malaysia’s Path to Decarbonization. Frontiers in Built Environment, 2020. 6(21).
Syafrudin, s., M. Budihardjo, N. Yuliastuti, and B. Ramadan, Assessment of Greenhouse Gases Emission from Integrated Solid Waste Management in Semarang City, Central Java, Indonesia. Evergreen, 2021. 8: p. 23-35.
Jaafar, A.B., Future Energy: Is OTEC the Solution, in myForesight. 2015. p. 4-5.
Muslim, M., M.I. Alhamid, Nasruddin, and B. Ismoyo, Analysis of the scroll compressor changing into an expander for small scale power plants using an organic rankine cycle system. Evergreen, 2020. 7(4): p. 615-620.
Sharma, M. and R. Dev, Review and Preliminary Analysis of Organic Rankine Cycle based on Turbine Inlet Temperature. Evergreen, 2018. 5.
Jaafar, A.B., M.K. Abu Husain, and A. Ariffin, Research and Development Activities of Ocean Thermal Energy-Driven Development in Malaysia. 2020.
Liu, W., X. Xu, F. Chen, Y. Liu, S. Li, L. Liu, and Y. Chen, A review of research on the closed thermodynamic cycles of ocean thermal energy conversion. Renewable and Sustainable Energy Reviews, 2020. 119: p. 109581.
Yoon, J.-I., C.-H. Son, S.-M. Baek, B.H. Ye, H.-J. Kim, and H.-S. Lee, Performance characteristics of a high-efficiency R717 OTEC power cycle. Applied Thermal Engineering, 2014. 72(2): p. 304-308.
Yuan, H., P. Zhou, and N. Mei, Performance analysis of a solar-assisted OTEC cycle for power generation and fishery cold storage refrigeration. Applied Thermal Engineering, 2015. 90: p. 809-819.
Tewari, K. and R. Dev, Analysis of Modified Solar Water Heating System Made of Transparent Tubes & Insulated Metal Absorber. Evergreen, 2018. 5: p. 62-72.
Yoon, J.-I., C. Son, Y. Kim, B. Ye, S. Ha, H.-S. Lee, and H.-J. Kim. The performance comparison of vapor-vapor ejector OTEC system using wet refrigerants. 2014.
Yamada, N., A. Hoshi, and Y. Ikegami, Performance simulation of solar-boosted ocean thermal energy conversion plant. Renewable Energy, 2009. 34: p. 1752-1758.
Samsuri, N., s.a.z. shaikh salim, M. Musa, and M.S. Mat Ali, Modelling performance of ocean-thermal energy conversion cycle according to different working fluids. Jurnal Teknologi, 2016. 78.
Yoon, J.I., C.H. Son, S.M. Baek, H.J. Kim, and H.S. Lee, Efficiency comparison of subcritical OTEC power cycle using various working fluids. Heat and Mass Transfer/Waerme- und Stoffuebertragung, 2014. 50(7): p. 985-996.
Yoon, J.-I., S.-H. Seol, C.-H. Son, S.-H. Jung, Y.-B. Kim, H.-S. Lee, H.-J. Kim, and J.-H. Moon, Analysis of the high-efficiency EP-OTEC cycle using R152a. Renewable Energy, 2017. 105: p. 366-373.
Caldiño Herrera, U., J.C. García, F.Z. Sierra-Espinosa, J.A. Rodríguez, O.A. Jaramillo, O. De Santiago, and S. Tilvaldiev, Enhanced thermal efficiency organic Rankine cycle for renewable power generation. Applied Thermal Engineering, 2021. 189: p. 116706.
Yoon, J.-I., C.-H. Son, S.-H. Seol, C.-M. Son, H.-S. Lee, and H.-J. Kim. OTEC Cycle Applying a Liquid-vapor Ejector and Motive Pump. in The Twenty-fifth International Ocean and Polar Engineering Conference. 2015.
Arsana, M.E., I.G.B. Wijaya Kusuma, M. Sucipta, and I.N. Suamir, Thermodynamic Analysis of Two-Phase Ejector as Expansion Device with Dual Evaporator Temperatures on Split Type Air Conditioning Systems. IOP Conference Series: Materials Science and Engineering, 2019. 494: p. 012034.
Atmaca, A., A. Erek, and O. Ekren, Impact of the mixing theories on the performance of ejector expansion refrigeration cycles for environmentally-friendly refrigerants. International Journal of Refrigeration, 2018. 97.
Atmaca, A.U., A. Erek, and O. Ekren, Preliminary Design of the Two-Phase Ejector under Constant Area Mixing Assumption for 5 kW Experimental System. E3S Web Conf., 2019. 103: p. 01002.
Eldred, M.P., J.C.V. Ryzin, S. Rizea, I.C. Chen, R. Loudon, N.J. Nagurny, S. Maurer, E. Jansen, A. Plumb, M.R. Eller, and V.R.R. Brown. Heat exchanger development for Ocean Thermal Energy Conversion. in OCEANS'11 MTS/IEEE KONA. 2011.
Lecompte, S., H. Huisseune, M. van den Broek, B. Vanslambrouck, and M. De Paepe, Review of organic Rankine cycle (ORC) architectures for waste heat recovery. Renewable and Sustainable Energy Reviews, 2015. 47: p. 448-461.
Thiru, S., Estimation of Ocean Thermal Energy Conversion Resources in the East of Malaysia. Journal of Marine Science and Engineering, 2020. 9.
Temperatures, G.S., 2021. Bandar Labuan WATER Temperature: Malaysia: Sea temperatures. Available from: https://www.seatemperature.org/asia/malaysia/bandar-labuan.htm, [Accessed 17 August 2021].
Ma, Z., H. Bao, and A.P. Roskilly, Thermodynamic modelling and parameter determination of ejector for ejection refrigeration systems. International Journal of Refrigeration, 2017. 75: p. 117-128.
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