An experimental and thermodynamic analysis was conducted to explore the match in operating conditions for the heat extraction of supercritical CO₂ and the CO₂ transcritical organic Rankine cycle (CTORC). The results revealed that in the optimal conditions of the experiment, the difference between the pseudocritical temperature and the inlet temperature ( ΔT _{pc − in}) was <10 K and T _b/T _pc (ratio of the bulk temperature to the pseudocritical temperature) was ≤1 (ideal scenario: T _b/T _pc = 1). Furthermore, the heat transfer and fluid flow of CO₂ as well as the CTORC system performance at the optimal T _b/T _pc could be simultaneously improved with respect to those at ΔT _{pc − in} < 10 K. The peak values of system efficiency for the inlet temperature of the expander of 100°C and 150°C were 5.1% at 12.5 MPa and 8.0% at 17 MPa, with the corresponding T _b/T _pc being 1.24 (T _pc of 55.9°C) and 1.45 (T _pc of 70°C), respectively. Consequently, to simultaneously improve the heat transfer, fluid flow and system efficiency, T _pc of the supercritical CO₂ in the CTORC should be sufficiently high to approach half the inlet temperature of the expander for obtaining an optimal T _b/T _pc at a low condensing temperature.

中文翻译：

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超临界二氧化碳热提取优化对跨临界功率循环的影响

进行了实验和热力学分析，以探索超临界CO ₂的热萃取和CO ₂跨临界有机朗肯循环（CTORC）的运行条件的匹配。结果表明，在该实验的最佳条件下，（在准温度和入口温度之间的差值ΔT_{的pc  -在}）<10 K和Ť _b / T _PC（整体温度到准临界温度的比） ≤1（理想情况：T _b / T _pc = 1）。此外，CO ₂的传热和流体流动 以及在最佳的CTORC系统性能Ť _b / T _PC可以同时相对于那些在提高ΔT _{PC  - 在}系统效率为100膨胀器的入口温度<10个K的峰值℃并150℃在12.5 MPa时为5.1％，在17 MPa时为8.0％，相应的T _b / T _pc分别为1.24（T _pc为55.9°C）和1.45（T _pc为70°C）。因此，为了同时改善传热，流体流动和系统效率，超临界CO _2的T _pc CTORC中的温度应足够高，以达到膨胀机入口温度的一半，以便在低冷凝温度下获得最佳的T _b / T _pc。