Numerical solution of homogeneous double pipe heat exchanger: Dynamic modeling

Dynamic modeling of a double-pipe heat exchanger is the subject of the currentstudy. the basis of this study is the same velocity of vapor and liquid phases or, in otherwords, homogeneous phase, in the annulus part of the exchanger. the model can predictthe temperature and vapor quality along the axial pipe from the pipe inlet up to a distancewhere steady state conditions are achieved. the simulation is conducted for two modesof co- and counter-ow in a one dimensional transient system. the physical propertiesof water are estimated from empirical correlation and a saturated vapor table with cubicspline interpolation. the exchanger model, which is a set of ordinary dierential equations(odes), odes and algebraic equations, has been solved numerically. modeling results havebeen investigated for dierent operating times and two modes of co- and counter-curren