This research has led waste heat of water chiller system with infrared vacuum drying by studying the efficiency of drying infrared vacuum dryer and waste heat of water chiller system with infrared vacuum drying. Then compare the energy use of drying infrared vacuum dryer and waste heat of water chiller system with infrared vacuum drying. The vacuum drying system It uses a vacuum pump to pull air out of the drying chamber so that the vacuum drying. and pump used to pump Liquid ring vacuum to use cold water for cooling. Products used in the experiment include chili, kaffir lime leaves and lemon grass. The temperature for drying at 60 ℃ and the pressure in the drying chamber 0.1, 0.2 bar. The results showed that waste heat of water chiller system with infrared vacuum drying. Reducing the time to dry faster and use less energy than drying infrared vacuum dryer