방법 비교

	로그 평균 온도차	Effectiveness-NTU 방법
분야	열역학	열역학
계열	Process / pipeline	Process / pipeline
기원 연도	1950	1984
창시자	Donald Kern	William Kays and Alvin London
유형	Heat transfer correlation	Heat transfer correlation
원전	Kern, D. Q. (1950). Process Heat Transfer. McGraw-Hill.	Kays, W. M., & London, A. L. (1984). Compact Heat Exchangers (3rd ed.). McGraw-Hill. ISBN: 978-0070334007
별칭	LMTD, logarithmic mean temperature difference	epsilon-NTU method, effectiveness method
관련	3	3
요약	The Log Mean Temperature Difference (LMTD) method is a fundamental tool for calculating heat transfer rates in heat exchangers. It defines the effective temperature difference between two fluids as the logarithmic average of the temperature differences at the inlet and outlet. This method enables engineers to size and analyze heat exchangers systematically using the basic heat transfer equation Q = U A LMTD.	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.