Abstract
This paper presents the dynamic behavior of the dehumidification process which has heat and mass transfer resistances on both gas and liquid sides.
Simplified two lumped systems which assume a gas bulk and a liquid bulk are considered. The double film theory to the distributions of concentration and temperature near the interface is used. Basic differential equations are obtained from the heat- and mass-balance relations. The equations are linearized and non-dimensionalized near the steady state and the block diagram and the transfer matrix are obtaind. A numerical example is also shown.
The result shows that there exists an interaction of heat and mass transfer, which depends on the temperature sensitivity of the gas-liquid equilibrium relationship, latent heat of evaporation of water and heat of dilution. The second result is that the over-all mass transfer coefficient is not constant and is shown as a function of transfer frequency when the input temperature of gas and liquid are constant and the humidity of the inlet gas and the concentration of the inlet liquid are variable.
