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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-517-2

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

HEAT AND MASS TRANSFER IN CROSS FLOW TRANSPORT MEMBRANE CONDENSER BASED HEAT EXCHANGER: A COMPUTATIONAL PARAMETRIC STUDY

Get access (open in a dialog) pages 949-958
DOI: 10.1615/TFEC2021.hex.032231

要約

Transport membrane condenser (TMC) based heat exchanger using nano-porous ceramic membrane can recover sensible and latent heat as well as water from the low-temperature flue gas which contains a high water content vapor and other non-condensable gases. The membrane tube is composed of multi-layer structure, where the water vapor from the flue gas releases latent heat as a result of the condensation in the outer layer of the membrane tube wall. The condensate then moves to the inner layer of the membrane tube wall and mix with the cooling water flow stream inside the tubes. In TMC heat exchangers, pore size of the membrane affects the transport phenomenon through the membrane. When the membrane is designed with a suitable pore size and thickness, the condensation will happen. In this paper, a wall-based condensation model using Fick's diffusion law in the membrane wall will be used to model the underlined heat and mass transfer processes. Transport of the water vapor and other species among those three zones will be modeled using appropriate User-Defined Functions (UDFs) in the computational fluid dynamic software ANSYS Fluent. The effects of the membrane properties, and geometrical parameters, such as tube diameter and thickness, at different operating conditions (inlet water temperature and flow rate, and inlet flue gas temperature and flow rate) on the condensation rate and outlet thermal conditions, are investigated and discussed.