Evaluation of the Power Generation Efficiency of a Hot Spring Heat Binary Power Generation System

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  • Saito Akira
    Department of Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University
  • Sasaki Yuta
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • Kimbara Kazuhide
    Department of Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University Department of Materials Science and Chemical Engineering, Shizuoka University
  • Sudou Masao
    Department of Environment and Energy Systems, Graduate School of Science and Technology, Shizuoka University Department of Materials Science and Chemical Engineering, Shizuoka University

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  • 温泉熱バイナリー発電システムの発電効率の評価
  • オンセンネツ バイナリー ハツデン システム ノ ハツデン コウリツ ノ ヒョウカ

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This research aimed to evaluate the power generation efficiency of a binary-cycle power-generation system that enables conversion to electric power of hot spring thermal energy in the low-temperature domain (140°C or less), one form of renewable geothermal energy. Power generation output, thermal efficiency, exergy efficiency and exergy destruction were estimated for five working fluids by process calculation using HYSYS. When the basic conditions were as hot spring heat temperature of 60–140°C, flow rate of the hot spring of 200 L/min, heat exchange temperature in the evaporator of 20°C, temperature difference at pinch point of 5°C, and i-butane as the working fluids, a difference in power generation output according to the working fluids was found at hot spring heat temperatures of 90°C and above. In order to obtain 19 kW of power generation output, the exergy destruction of the power generation system was 27 kW, and the exergy destruction of the evaporator accounted for 44% of the whole. When groundwater or river water was used in the cooling process of the condenser, the power generation output was decreased by about 20% with the rise in circulating water temperature in summer.

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