A numerical simulation model of a desiccant rotor for the use in the low dew-point dry air production process was developed and tested. At first, the adsorption isotherm curve of the tested desiccant honeycomb was accurately measured in the low relative humidity region. Also, the numerical simulation model was modified in consideration of temperature and humidity gradients in the radial direction of honeycomb channel of the desiccant. The validity of the modified simulation model was discussed by comparison with an adsorption-desorption behavior of the desiccant honeycomb block. It was found that the simulated results almost agreed with the experimental results and correctly indicated the adsorption / desorption behavior. Also, simulated results implied that consideration of the radial humidity gradients into the numerical model became more important as the size of honeycomb pitch increased.

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