It hAtf O

Fig. 10. Schematic representation of temperature and concentration profiles in the boundary layer adjacent to the membrane.

where N (kmol m ~ K"1) is the mass transfer flux through the membrane, and <4 H (kj kmol"1) is the latent heat of the volatile component. Here qv (W m"2} is only a fraction of the heat energy transferred to the membrane surface and through the membrane in the form of latent heat. Besides the heat flux represented by qv, due to the temperature difference between the two surfaces of the membrane, heat is also conducted through the membrane material and the gas that fills the pores with the flux:

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