So sánh phương pháp

	Hiệu số nhiệt độ trung bình logarit	Phương pháp Hiệu suất-NTU
Lĩnh vực	Nhiệt động lực học	Nhiệt động lực học
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1950	1984
Người khởi xướng	Donald Kern	William Kays and Alvin London
Loại	Heat transfer correlation	Heat transfer correlation
Công trình gốc	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
Tên gọi khác	LMTD, logarithmic mean temperature difference	epsilon-NTU method, effectiveness method
Liên quan	3	3
Tóm tắt	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.