Investigation on Calculation Method of Mean Temperature Difference in Heat Exchanger Thermodynamic Calculation

The calculation method for the logarithm mean temperature difference (LMTD) and the arithmetic temperature difference was analyzed.Heat exchange is calculated by two methods of logarithm mean temperature difference and measuring of wall temperature,and calculation results were analyzed.Ex-periment showed that in the calculation of the convective heat transfer coefficient,the results gained by these two methods had large differences,especially in low Reynolds number region.The difference of the calculation results came from the distinctness between LMTD and AMTD.In the turbulent flow area,the difference became small and LMTD can be adopted to analyze the convective heat transfer characteristics in the turbulent flow area in the engineering calculation.