One infrared de-icing system requires that the heating process take place inside a specially-constructed hangar. This heat transfer mechanism is substantially faster than conventional heat transfer modes used by conventional de-icing (convection and conduction) due to the cooling effect of the air on the de-icing fluid spray. ( See Environmental impacts and mitigation.) Infrared heating de-icingĭirect infrared heating has also been developed as an aircraft de-icing technique. Even though PG is classified as non-toxic, it pollutes waterways since it consumes large amounts of oxygen as it decomposes, causing aquatic life to suffocate. :101 Airports typically use containment systems to capture the used liquid, so that it cannot seep into the ground and water courses. When applied, most of the de-icing fluid does not adhere to the aircraft surfaces, and falls to the ground. However, PG is more common because it is less toxic than ethylene glycol. :43 Ethylene glycol (EG) fluids are still in use for aircraft de-icing in some parts of the world because it has a lower operational use temperature (LOUT) than propylene glycol (PG). Thickeners are also used to help the de-icing agent adhere to the airplane body. Furthermore, dislodged ice can damage the engines.ĭe-icing fluids typically consist of a glycol-water solution containing a dye and agents to protect the metal surface. Frozen contaminants interfere with the aerodynamic properties of the vehicle. On the ground, when there are freezing conditions and precipitation, de-icing an aircraft is commonly practiced.
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