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Coupled heat and mass transfer in a counter flow hollow fiber membrane module for air humidification. (English) Zbl 1210.80013

Summary: Hollow fiber membrane based air humidification offers great advantages over the traditional methods because the liquid water droplets are prevented from mixing with the process air, while water vapor can permeate through the membranes effectively. The novelty in this research is that the coupled heat and moisture transport in a hollow fiber membrane module for air humidification is investigated, both numerically and experimentally. The air stream and the water stream flow in a counter flow arrangement. It is found that the membranes play a key role in humidification performances. For sensible heat transfer, both the liquid side and the membrane side resistance can be neglected, while the total heat transfer coefficients are determined by the air side heat transfer coefficients. In contrast, in mass transfer, only the liquid side resistance can be neglected, while the total mass transfer coefficients are co-determined by membrane properties and the air side convective mass transfer coefficients.

MSC:

80A20 Heat and mass transfer, heat flow (MSC2010)
76R50 Diffusion
80M20 Finite difference methods applied to problems in thermodynamics and heat transfer
80-05 Experimental work for problems pertaining to classical thermodynamics
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