Evaluation of the applicability of a binary cycle for the utilization of hot spring water
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The applicability of hot spring water to binary cycles or organic Rankine cycles (ORCs) was empirically verified in Japan and Indonesia where hot spring water is used as a heat source for power generation. The purpose of this study was to introduce an ORC/binary system and verify its applicability by using hot spring water-approximately 65 ℃ from the Dongnae area of Busan. The system efficiency and generated power were estimated by a simulation analysis prior to the introduction of the system, and the analysis was conducted to select an optimum working fluid and derive an efficiency improvement method. The analysis results showed that the system efficiency of the basic cycle was highest at 6.20%, when butane was used as a refrigerant, followed by isobutane, R245fa, and R245ca. As a result of analyzing the cycle performance by applying regenerators to only the top four refrigerants, an increase in efficiency of 9.36% compared with the efficiency of the basic cycle was confirmed when R245ca was applied. Regarding the cycle performance change due to the degree of super-heating at the turbine inlet, system efficiency tended to increase as the super-heating degree increased for all four refrigerants. When a super- heating degree of 6 ℃ was set, the efficiency of the system with R245ca was the highest at 6.93%. This indicated that butane is the optimum refrigerant for application in the basic binary cycle, and that it is reasonable to select R245ca as the working fluid for a binary cycle with a regenerator.
Abstract
The applicability of hot spring water to binary cycles or organic Rankine cycles (ORCs) was empirically verified in Japan and Indonesia where hot spring water is used as a heat source for power generation. The purpose of this study was to introduce an ORC/binary system and verify its applicability by using hot spring water-approximately 65 ℃ from the Dongnae area of Busan. The system efficiency and generated power were estimated by a simulation analysis prior to the introduction of the system, and the analysis was conducted to select an optimum working fluid and derive an efficiency improvement method. The analysis results showed that the system efficiency of the basic cycle was highest at 6.20%, when butane was used as a refrigerant, followed by isobutane, R245fa, and R245ca. As a result of analyzing the cycle performance by applying regenerators to only the top four refrigerants, an increase in efficiency of 9.36% compared with the efficiency of the basic cycle was confirmed when R245ca was applied. Regarding the cycle performance change due to the degree of super-heating at the turbine inlet, system efficiency tended to increase as the super-heating degree increased for all four refrigerants. When a super- heating degree of 6 ℃ was set, the efficiency of the system with R245ca was the highest at 6.93%. This indicated that butane is the optimum refrigerant for application in the basic binary cycle, and that it is reasonable to select R245ca as the working fluid for a binary cycle with a regenerator.
참고문헌 (8)
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