PURPOSE: A regenerative evaporative cooler, a cooling system and a core module of the system are provided to effectively block the inflow of the evaporated water by separating a dry channel guide duct from a wet channel. CONSTITUTION: A regenerative evaporative cooler(1) comprises a dry channel, a wet channel, an evaporated water supply(70), and a dry channel guide duct. The absorbed indoor air passes through the dry channel. The wet channel heat-exchanges with the dry channel. The evaporated water supply is arranged at the top of the wet channel and supplies the evaporated water to wet the wet channel. The dry channel guide duct is formed at the top of the dry channel and separated the dry channel from the wet channel.
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