DESICCANT DEHUMIDIFIER

PROBLEM TO BE SOLVED: To provide a desiccant dehumidifier capable of supplying the air at a low temperature and low humidity indoors at low driving energy consumption. SOLUTION: This desiccant dehumidifier has a total heat exchanger 9 exchanging the total heat of sensible heat and latent heat between the air passing through a primary side 9a and the air passing through the secondary side 9b and a dehumidifying rotor 1 allowing a dehumidifying agent to absorb moisture at the primary side 1a to dehumidify the air passing through the primary side 1a and releasing moisture from the dehumidifying agent for regeneration by the exposure to heated air at the secondary side 1b. A supply air path 3 is provided in such a manner that outdoor air is supplied indoors through the primary side 9a of the total heat exchanger 9 and the primary side 1a of the dehumidifying rotor 1 in order. An exhaust air path 10 is provided in such a manner that indoor air is exhausted outdoors through the secondary side 2b of the total heat exchanger 9. A heated air path 4 is provided in such a manner that the heated air heated by a heat source is exhausted outdoors through the secondary side 1b of the dehumidifying rotor 1.