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Jung-Hyun Moon; Ho-Saeng Lee; Seung-Taek Lim; Jong-Beom Seo; Hyeon-Ju Kim. Plant Performance Evaluation Experiment to Expand the Applicability of Ocean Thermal Energy Conversion. Journal of Power System Engineering 2020, 24, 78 -85.
AMA StyleJung-Hyun Moon, Ho-Saeng Lee, Seung-Taek Lim, Jong-Beom Seo, Hyeon-Ju Kim. Plant Performance Evaluation Experiment to Expand the Applicability of Ocean Thermal Energy Conversion. Journal of Power System Engineering. 2020; 24 (5):78-85.
Chicago/Turabian StyleJung-Hyun Moon; Ho-Saeng Lee; Seung-Taek Lim; Jong-Beom Seo; Hyeon-Ju Kim. 2020. "Plant Performance Evaluation Experiment to Expand the Applicability of Ocean Thermal Energy Conversion." Journal of Power System Engineering 24, no. 5: 78-85.
To mitigate the power shortage problem in the South Pacific island nations and the equatorial area, we studied the development characteristics of ocean thermal energy conversion (OTEC) using abundant clean ocean energy. Through the simulation of open- and closed-cycle OTEC, the generation amount and its economic efficiency were compared, and the application characteristics of the power generation cycle according to the seawater temperature distribution were compared by applying various seawater temperature conditions. According to the characteristics of seawater heat sources in the region, the power generation output was about 883.2 kW in Samoa, and the average power generation by region was about 650.5 kW for the open-cycle OTEC model. Regional revenue up to approximately $8,487,000 was generated in Kiribati, driven by the higher electricity tariff of $0.327/kWh and high water costs of $5.86/ton. With the spread of 50 MW commercial plants, Kiribati had a high net present value of $1,930,402,000, and its internal rate of return was more than 37.0%. This paper is presents a method of securing economic feasibility of OTEC according to various heat source conditions and economic conditions in the region, while it also analyzes the capacity and type of the power plant.
Lim Seungtaek; Lee Hosaeng; Moon Junghyun; Kim Hyeonju. Simulation Data of Regional Economic Analysis of OTEC for Applicable Area. Processes 2020, 8, 1107 .
AMA StyleLim Seungtaek, Lee Hosaeng, Moon Junghyun, Kim Hyeonju. Simulation Data of Regional Economic Analysis of OTEC for Applicable Area. Processes. 2020; 8 (9):1107.
Chicago/Turabian StyleLim Seungtaek; Lee Hosaeng; Moon Junghyun; Kim Hyeonju. 2020. "Simulation Data of Regional Economic Analysis of OTEC for Applicable Area." Processes 8, no. 9: 1107.
As a means to solve the power shortage problem in the South Pacific island nations and the equator, we studied the development characteristics of ocean thermal energy conversion (OTEC) using near-infinity clean ocean energy. Through the simulation of the closed OTEC plant under development, the generation amount and its economic efficiency were compared and the application characteristics of the power generation cycle according to the seawater temperature distribution were compared by applying various seawater temperature conditions. According to the characteristics of seawater heat sources in the region, the power generation output was about 759.9 kW in Kiribati, and the average power generation by region was about 590.9 kW. Regional electricity sales generated about 8,487 thousand dollars in Kiribati, which had a high power cost of 0.327 $/kWh, and 1,278 thousand dollars in Australia, generating 0.29 $/kWh. With the spread of 50 MW commercial plants, Australia and Kiribati have high net present values (NPV) of 108,000 and 580,000 thousand dollars, respectively, and their internal rate of return (IRR) are more than 8.5% and 19.6%, respectively. In the future, various benefits will be applied to secure economic feasibility and accelerate the spread of closed OTEC plant.
Seung-Taek Lim; Ho-Seang Lee; Jung-Hyoen Moon; Hyoen-Ju Kim. Simulation of Regional Economic Analysis of Closed Cycle OTEC for Empirical Application. Journal of the Korean Society for Power System Engineering 2020, 24, 73 -82.
AMA StyleSeung-Taek Lim, Ho-Seang Lee, Jung-Hyoen Moon, Hyoen-Ju Kim. Simulation of Regional Economic Analysis of Closed Cycle OTEC for Empirical Application. Journal of the Korean Society for Power System Engineering. 2020; 24 (2):73-82.
Chicago/Turabian StyleSeung-Taek Lim; Ho-Seang Lee; Jung-Hyoen Moon; Hyoen-Ju Kim. 2020. "Simulation of Regional Economic Analysis of Closed Cycle OTEC for Empirical Application." Journal of the Korean Society for Power System Engineering 24, no. 2: 73-82.
Near infinite seawater thermal energy, which is considered as an alternative to energy shortage, is expected to be available to 98 countries around the world. Currently, a demonstration plant is being built using closed MW class ocean thermal energy conversion (OTEC). In order to stabilize the operation of the OTEC, automation through a PID control is required. To construct the control system, the control logic is constructed, the algorithm is selected, and each control value is derived. In this paper, we established an optimal control system of a closed OTEC, which is to be demonstrated in Kiribati through simulation, to compare the operating characteristics and to build a system that maintains a superheat of 1 °C or more according to seawater temperature changes. The conditions applied to the simulation were the surface seawater temperature of 31 °C and the deep seawater temperature of 5.5 °C, and the changes of turbine output, flow rate, required power, and evaporation pressure of the refrigerant pump were compared as the temperature difference gradually decreased. As a result of comparing the RPM control according to the selected PID control value, it was confirmed that an error rate of 0.01% was shown in the temperature difference condition of 21.5 °C. In addition, the average superheat degree decreased as the temperature difference decreased, and after about 6000 s and a temperature decrease to 24 °C or less, the average superheat degree was maintained while maintaining the superheat degree of 1.7 °C on average.
Lim Seungtaek; Lee Hoseang; Kim Hyeonju. Dynamic Simulation of System Performance Change by PID Automatic Control of Ocean Thermal Energy Conversion. Journal of Marine Science and Engineering 2020, 8, 59 .
AMA StyleLim Seungtaek, Lee Hoseang, Kim Hyeonju. Dynamic Simulation of System Performance Change by PID Automatic Control of Ocean Thermal Energy Conversion. Journal of Marine Science and Engineering. 2020; 8 (1):59.
Chicago/Turabian StyleLim Seungtaek; Lee Hoseang; Kim Hyeonju. 2020. "Dynamic Simulation of System Performance Change by PID Automatic Control of Ocean Thermal Energy Conversion." Journal of Marine Science and Engineering 8, no. 1: 59.