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F. Escanes, C. Pérez-Segarra, A. Oliva (1995)
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This paper deals with a numerical simulation of the thermal andfluiddynamic behaviour of doublepipe condensers and evaporators. Thegoverning equations of the fluid flow continuity, momentum and energy inboth the tube evaporating or condensing flow and the annulus singlephaseflow, together with the energy equation in the tube wall, are solvediteratively in a segregated manner using a onedimensional, transientformulation, based on an implicit step by step numerical scheme in the zoneswith fluid flow tube and annulus, and an implicit central differencenumerical scheme in the tube wall, solved by means of the TriDiagonal MatrixAlgorithm TDMA. This formulation requires the use of empirical informationfor the evaluation of convective heat transfer, shear stress and voidfraction. Two criteria to calculate the location of the points of transitionbetween singlephase and twophase flow are tested. An analysis of thedifferent parameters used in the discretization is made. Some illustrativeresults corresponding to the solution of a condenser and an evaporator usingtwo different working fluids R12 and R134a are presented.
International Journal of Numerical Methods for Heat & Fluid Flow – Emerald Publishing
Published: Sep 1, 1995
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