Numerical simulation for the heat transfer of a helical double-pipe vertical evaporator
Systematic methods and tools for managing the complexity
Advances in Computational & Numerical Methods (T4-4P)
Keywords: evaporator, heat transfer, helical, numerical simulation
D. Colorado-Garrido a, J. A. Hernández a, D. Juárez-Romero a, O. García-Valladares b
a Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos (UAEM). Av. Universidad 1001, Col. Chamilpa, 62210, Cuernavaca, Morelos, México.
b Centro de Investigación en Energía (CIE), Universidad Nacional Autónoma de Morelos (UNAM) .Privada Xochicalco S/N, Temixco, 62580, Morelos México.
ABSTRACT
A dynamic model is developed to describe the heat transfer of a helical double-pipe vertical evaporator employee for the waste energy recovery heat transformer by water purification process. The evaporator uses water like fluid of work in crosscurrent. The dynamic model consider equations of continuity, momentum and energy in each flow. The heat transfer by conduction in the internal tube wall is adiabatic, in addition the change of state is carried out in the section of internal tube. The discretized governing equations in the zones with fluid flow are coupled using an implicit step by step method. The void fraction, shear stress and convective heat transfer are obtained of empirical correlations for helical systems reported in the literature. The solution of the equations, calculate in each point of the mash, which the domain is discretized (mass fraction, pressures, temperatures, enthalpies, velocities, heat fluxes) are based on the time. A model by Artificial Neural Network is proposed to the thermodynamics properties calculate in each step of the mesh, as well as during the change of phase. The theoretical calculates are compared with the experimental data of the evaporator in the system. The results are obtained satisfactory for the input and output flows of the evaporator. Therefore is recommendable to use this developed dynamic model.
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Presented Tuesday 18, 13:30 to 15:00, in session Advances in Computational & Numerical Methods (T4-4P).
