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	ブレイтонサイクル	有限時間熱力学	ランキンサイクル	蒸気圧縮サイクル
分野	熱力学	熱力学	熱力学	熱力学
系統	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1873	1996	1859	1834
提唱者	George Brayton	Adrian Bejan	William John Macquorn Rankine	Jacob Perkins
種類	Thermodynamic cycle	Thermodynamic optimization	Thermodynamic cycle	Thermodynamic cycle
原典	Moran, M. J., Shapiro, H. N., Boettner, D. D., & Bailey, M. B. (2014). Fundamentals of Engineering Thermodynamics (8th ed.). Wiley. ISBN: 978-1118412947	Bejan, A. (1996). Entropy Generation Minimization. CRC Press. ISBN: 978-0849394515	Smith, J. M., Van Ness, H. C., & Abbott, M. M. (2005). Introduction to Chemical Engineering Thermodynamics (7th ed.). McGraw-Hill. ISBN: 978-0071247009	Stoecker, W. F., Jones, J. W., & Sunnam, B. A. (1998). Refrigeration and Air Conditioning (2nd ed.). McGraw-Hill. ISBN: 978-0070613638
別名	Joule cycle, gas turbine cycle	FTT, irreversible thermodynamics	Clausius-Rankine cycle, steam cycle, vapor power cycle	refrigeration cycle, heat pump cycle
関連	3	3	3	3
概要	The Brayton Cycle (also called Joule Cycle) describes the thermodynamic process in gas turbines and jet engines. It consists of four processes: isentropic compression in a compressor, isobaric combustion (heat addition), isentropic expansion in a turbine, and isobaric heat rejection. The Brayton Cycle is the foundation for analyzing aircraft propulsion, ground-based power generation, and simple-cycle gas turbine plants.	Finite-Time Thermodynamics (FTT) relaxes the classical assumption that thermodynamic processes occur reversibly (infinitely slowly). Instead, it analyzes real thermal systems operating at finite rates with irreversibilities. FTT reveals fundamental trade-offs: to complete a process quickly requires accepting large irreversibilities and low efficiency, while slow operation achieves high efficiency but requires impractical time and cost.	The Rankine Cycle is the fundamental thermodynamic cycle for steam power plants. It describes how thermal energy from burning fuel or concentrated solar radiation is converted to mechanical work and ultimately electricity. The cycle consists of four processes: isobaric heat addition in the boiler, isentropic expansion through the turbine, isobaric heat rejection in the condenser, and isentropic compression by the pump.	The Vapor Compression Cycle is the fundamental thermodynamic cycle for refrigeration systems and heat pumps. It describes how mechanical work is used to transfer heat from a cold space (evaporator) to a warm space (condenser), operating against the natural temperature gradient. The cycle consists of four processes: isentropic compression, isobaric condensation, isenthalpic throttling, and isobaric evaporation.