In-Direct Evaporative Colling [IDEC] the modern method of cooling . the evaporative cooler is used in 2 stage to cools the air and reducing humidity. It adds into heat exchanger to circulate the water. This system removes the heat and moisture. The hot air cooled by the system and again cooled through wet pad section without any moisture. This process of cooling drops temperature below the existing ambient air. Applications- automobile industry, export house, NTPC, NPCIL