Thermal stresses in U-tubes of heat exchangers

摘要

A comprehensive procedure for development of the design charts for determination of thermal stresses due to interleg differential thermal expansion in U-tubes of heat exchangers is presented. A computer program, based on the classical method isemployed for generation of the charts. A parametric study covering the practical range of heat exchanger geometrical parameters is carried out to identify the critical parameters. Each geometric parameter is expressed as a scalar multiple of tube outerdiameter. A typical chart shoving the variation of (MAX.STRESS/E) as a function of tube overhang, bend radius, baffle spacing, tube thickness, tube diameter and interleg differential thermal expansion is presented. The using of the chart isdemonstrated with an example. The charts are intended for the designers to quickly determine thermal stresses while optimising the design of U-tube heat exchangers.ABS BRACT