Numerical simulation of a membrane desorber with the H2O-LiBr working mixture for absorption cooling systems

被引:5
作者
Medina-Caballero, I. L. [1 ]
Rivera, W. [1 ]
Ituna-Yudonago, J. F. [2 ]
Ibarra-Bahena, J. [1 ]
机构
[1] Univ Nacl Autonoma Mexico, Inst Energias Renovables, Privada Xochicalco S-N, Temixco 62580, Morelos, Mexico
[2] Univ Politecn Metropolitana Hidalgo, Dept Ingn Aeronaut, Blvd Acceso Tolcayuca 1009,Ex Hacienda San Javier, Tolcayuca 43860, Hidalgo, Mexico
关键词
Membrane desorber; Absorption chiller; CFD; MASS-TRANSFER; THERMODYNAMIC PROPERTIES; DISTILLATION; WATER; DESORBER/CONDENSER; ABSORBER; BEHAVIOR; DESIGN; MODEL;
D O I
10.1016/j.tsep.2024.102399
中图分类号
O414.1 [热力学];
学科分类号
摘要
In absorption cooling systems, the refrigerant fluid is separated from the working-fluid mixture inside a component called "desorber". Conventional desorbers operate by boiling separation; however, membrane modules are a potential alternative to replace them since they can operate below the working mixture boiling point and at atmospheric pressure conditions. The present paper presents a numerical simulation of a membrane desorber that uses the air gap membrane distillation configuration. The numerical analysis was carried out by means of ANSYS FLUENT CFD code using a 3D model. Temperature, concentration, and velocity contours were numerically obtained assuming H2O-LiBr solution at 41 % w/w, mass flow of 0.03 kg/s, temperature of 363.15 K, and cooling water at 303.15 K and 0.04 kg/s. The maximum error in simulated temperature was 11.9 % compared to the experimental data. According to the results, a solution temperature difference between the bulk and the membrane interphase up to 288.15 K was calculated. In addition, stagnated areas inside the solution channel cause velocity differences of up to 5 magnitude orders compared to the middle point in the solution channel. Since a maldistribution flow causes a "jet" inside the solution channel, and a non-homogeneous concentration distribution on the membrane interphase; as a result, a concentration difference up to 1.35 % between a point located at the border membrane interphase compared to a point located at the middle was observed. Therefore, the desorption rate can be improved with geometric modifications in the membrane desorber device.
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页数:14
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