השוואת שיטות

	שיטת Effectiveness-NTU	ממוצע לוגריתמי של הפרשי טמפרטורה
תחום	תרמודינמיקה	תרמודינמיקה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1984	1950
הוגה השיטה	William Kays and Alvin London	Donald Kern
סוג	Heat transfer correlation	Heat transfer correlation
מקור מכונן	Kays, W. M., & London, A. L. (1984). Compact Heat Exchangers (3rd ed.). McGraw-Hill. ISBN: 978-0070334007	Kern, D. Q. (1950). Process Heat Transfer. McGraw-Hill.
כינויים	epsilon-NTU method, effectiveness method	LMTD, logarithmic mean temperature difference
קשורות	3	3
תקציר	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 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.