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Design optimizations of the thermal performance and cost in an air-gap hollow fiber membrane contactor (AHFMC)

机译:气隙中空纤维膜接触器(AHFMC)的热性能和成本的设计优化

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摘要

An air–gap hollow fiber membrane contactor (AHFMC) has been proposed and applied for fluid heating in the HVAC applications. The water and the liquid desiccant (solution) streams flow inside the neighboring hollow fiber membranes in a cross-flow arrangement. The solution is heated due to the absorption and mixing heats by absorbing the water vapor from the water stream. A mathematical model of the coupled heat and mass transports in the AHFMC is established by converting it into a parallel-plate one. The optimal design of the AHFMC is studied by using the multi-objective particle swarm optimization (MOPSO) algorithm to obtain the maximum thermal performance and minimum total annual cost together with the coupled heat and mass transfer model. A set of multiple optimum solutions, which are named as “Pareto optimal solutions”, are then obtained. Influences of geometric variables of the contactor length, width, height, fiber outer diameter and fiber distances in different directions on the heating performance and total annual cost are studied. The optimally geometrical parameters of the AHFMC are obtained using the MOPSO algorithm. These results are useful for the design of the AHFMC based on the desired temperature lift, the contactor constraint, and the available investment in the real applications.
机译:提出了一种气隙中空纤维膜接触器(AHFMC),并将其用于HVAC应用中的流体加热。水和液体干燥剂(溶液)流以错流方式在相邻的中空纤维膜内部流动。溶液由于吸收而被加热,并且通过从水流吸收水蒸气来混合热量。通过将AHFMC中的传热和传质耦合转换为平行板,建立了数学模型。通过使用多目标粒子群优化算法(MOPSO)研究AHFMC的优化设计,以获得最佳的热性能和最小的年度总成本,以及耦合的传热和传质模型。然后获得一组多个最优解,称为“帕累托最优解”。研究了接触器长度,宽度,高度,纤维外径和不同方向上的纤维距离等几何变量对加热性能和年总成本的影响。使用MOPSO算法可获得AHFMC的最佳几何参数。这些结果对于基于所需温度提升,接触器约束以及实际应用中的可用投资的AHFMC设计非常有用。

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