A cooling machine should have a sintering machine, exhaust-heat boiler, cooler, and main stem pipeline. As per the image, condensation is the process where water vapor becomes liquid. It is the reverse of evaporation, where liquid water becomes a vapor. A cooling process flow diagram should also have a deaerator, which is a device that removes oxygen and other dissolved gases from liquids and pumpable compounds. A Process Flow Diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment.