Developing of a New Method of Optimized Design of Heat Exchangers

Because of the number of parameters involved, heat exchangers are mainly designed by approximate approach, following the TEMA standards. The method here presented cuts down the empirical components by applying ANSYS to typical heat transfer formulations; the length of the apparatus is divided in as many sections as desired; then a point is selected in each fluid and internal and external faces; those points are joined with a conductive or convective element of heat transfer, depending of its position. All physic and thermal properties are made dependent of temperature. The iterative calculations give the energy flow between points and sections, together with pressure and temperature distributions. Testing prototypes will allow to adjust constants. A previous work of data base fluids’ properties is needed. The parameters which influence design and dimensions of the exchanger are so calculated much more precisely, resulting in better efficiency and lower prices. The example here presented is liquid-liquid tube and casing exchanger. Other types and flows are being analyzed.

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