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	熱交換器の熱性能を、理論的に可能な最大熱伝達に対する比率で測定する代替アプローチであるEffectiveness-NTU法。	蒸気圧縮サイクル
分野	熱力学	熱力学
系統	Process / pipeline	Process / pipeline
提唱年	1984	1834
提唱者	William Kays and Alvin London	Jacob Perkins
種類	Heat transfer correlation	Thermodynamic cycle
原典	Kays, W. M., & London, A. L. (1984). Compact Heat Exchangers (3rd ed.). McGraw-Hill. ISBN: 978-0070334007	Stoecker, W. F., Jones, J. W., & Sunnam, B. A. (1998). Refrigeration and Air Conditioning (2nd ed.). McGraw-Hill. ISBN: 978-0070613638
別名	epsilon-NTU method, effectiveness method	refrigeration cycle, heat pump cycle
関連	3	3
概要	The Effectiveness-NTU method is an alternative approach to heat exchanger analysis that measures thermal performance relative to the theoretical maximum possible heat transfer. It is particularly powerful for design problems where outlet temperatures are unknown. The method uses effectiveness (ratio of actual to maximum possible heat transfer) and NTU (Number of Transfer Units, a dimensionless parameter related to overall heat transfer area) to characterize heat exchanger performance.	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.