A Framework for Characterising the Limiting Efficiency of Organic Rankine Cycles with an Internal Heat Exchanger for Dry and Isentropic Working Fluids
乾性・等エントロピー作動流体を用いた内部熱交換器付き有機ランキンサイクルの限界効率特性評価のための枠組み (AI 翻訳)
González J, Saavedra N, González L, Contreras D, Garrido JM, Quinteros-Lama H
🤖 gxceed AI 要約
日本語
本論文は、内部熱交換器（IHE）を備えた有機ランキンサイクル（ORC）の限界効率と最適効率を特徴付ける数学的枠組みを提案する。ヘルムホルツエネルギー関数に基づき、ファンデルワールス状態方程式とPC-SAFTモデルを用いて実流体に拡張した。結果、乾性作動流体ではIHE統合により効率が大幅に向上し、凝縮器温度の極端な条件下では効果が減少することを示した。実用的にはIHE出口の温度差最小化が重要である。
English
This paper proposes a mathematical framework to characterize the limiting and optimal efficiency of Organic Rankine Cycles (ORCs) with an internal heat exchanger (IHE). Based on the Helmholtz energy function, it extends to real fluids via van der Waals and PC-SAFT models. Results show that IHE integration significantly enhances efficiency for drier working fluids, with gains diminishing at condenser temperature extremes. Practical guidelines emphasize minimizing the temperature difference at the IHE outlet.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の産業部門では工場排熱の有効活用がGX推進の鍵であり、本枠組みは廃熱回収ORCの設計最適化に資する。SSBJや省エネ法対応の観点から、エネルギー効率向上は脱炭素と競争力強化に直結する。
In the global GX context
Globally, waste heat recovery is a key strategy for industrial decarbonization. This framework provides theoretical and practical guidance for ORC design, supporting energy efficiency improvements that align with TCFD/ISSB disclosure expectations and transition finance criteria.
👥 読者別の含意
🔬研究者:Provides a theoretical framework for ORC efficiency limits, useful for further research in waste heat recovery optimization.
🏢実務担当者:Offers practical guidelines for selecting working fluids and operating conditions to maximize ORC performance in waste heat recovery systems.
📄 Abstract（原文）
The decarbonisation of the energy sector requires efficient strategies to reduce fuel consumption and greenhouse gas emissions. Organic Rankine Cycles (ORCs) have emerged as a promising technology for waste heat recovery due to their flexibility and ability to operate with low- and medium-temperature heat sources. This work develops a general mathematical framework, grounded in the Helmholtz energy function, to characterise the limiting and optimal efficiency of ORCs equipped with an Internal Heat Exchanger (IHE) when operating with dry and isentropic working fluids. The framework is exemplified using the van der Waals equation of state and extended to real fluids through the PC-SAFT model. Results show that integrating an IHE significantly enhances efficiency for drier working fluids, which expand deeper into the superheated vapour region, enabling greater internal heat recovery. Efficiency gains diminish at condenser temperature extremes, defining operational boundaries where IHE integration is less effective. From a practical perspective, minimising the temperature difference at the IHE outlet (ΔTmin) is critical to maximise performance. The proposed framework provides theoretical insight and practical guidelines for fluid selection and operating strategies in ORC-based waste heat recovery systems.
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.20944/preprints202608.0657.v1first seen 2026-08-12 04:31:18 · last seen 2026-08-13 04:42:59
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