A procedure for evaluating the performance of a small batch-type solid desiccant dehumidifier using silica gel has been proposed in this article. Pseudo steady-state concept was adopted when performing calculations with analytical models to avoid the complexity of cascade iteration loops. The dehumidifier was intended to install in a conditioned room to handle the latent load while the sensible load was handled by a conventional air conditioning system. The proposed calculation procedure was applied to a case of a sample 4 x 4 x 3 m³ artifact storage room in a museum where the temperature was controlled at 25^oC. The relative humidity in the room was assumed to be controlled (on-off scheme) within the range of 50±5%RH (0.0099±0.0010 kg_w/kg_da) as required for a museum. Spreadsheet software was used to evaluate the performance of the dehumidifier including amount of absorbed moisture, temperature and humidity level of dehumidified air, and temperature and moisture content of silica gel at each time step. Moisture balance inside the room was also carried out. The results showed that to be able to control the moisture level inside the room within the desired range, the following operating conditions shall be met: mass of silica gel of 40-45 kg, thickness of packed bed of 0.3-0.7 m, and air velocity of 0.3-0.4 m/s. The results from the proposed evaluation procedure were found to agree well with literature.