This study aims to develop and evaluate a desiccant ventilation system using desiccant rotors of the Wakkanai siliceous shale (WSS). The desiccant apparatus consists of two WSS rotors, two heat exchangers for regeneration and two heat exchangers for pre-cooling. The target for the system is to remove all of latent heat load from outside air (7.6 g/kgDA) without condensing. In the experiments, when 40 ℃ water supplied to one of the heat exchanger for regeneration, condensation was inevitable in heat exchangers for pre-cooling. The condition to dehumidify 7.6 g/kgDA without condensation was to run two rotors at 0.5 rpm and to supply 21.5 ℃ water to heat exchangers for pre-cooling and 45 ℃ water to another two for regeneration. Under the condition, enthalpy needed to dehumidify was reduced by 18 % compared to conventional dehumidification.
