How much power does an APU generate?
Aircraft APUs generally produce 115 V AC voltage at 400 Hz (rather than 50/60 Hz in mains supply), to run the electrical systems of the aircraft; others can produce 28 V DC voltage . APUs can provide power through single or three-phase systems.
Does a 737 have an APU?
The APU is a source of bleed air and AC electrics for the aircraft, this gives independence during turnarounds, electrical backup in the event of engine failure and provides air conditioning & pressurisation during an engine bleeds off take-off. There are many different APUs available for the 737.
Is it necessary that APU should be running the entire flight?
The APU is a completely independent system which operates on the ground and in flight. Its main function consists of providing energy should it be necessary. It does not provide propulsion to the aircraft.
What kind of Apu does a Boeing 737 have?
There are many different APU’s available for the 737. The most common is the Garrett GTCP (Gas Turbine Compressor [air] Power unit [electrics]) 85-129. This was standard for the series 1/200 but when the -300 was introduced it was found that two to three times the energy was needed to start the larger CFM56 engines.
What kind of power does a Boeing 737 have?
It’s electrical power source is the battery, many series -500 aircraft have an extra, dedicated APU battery to preserve main battery usage. There are many different APUs available for the 737.
What kind of power does an APU use?
The battery can also be used to start the APU. Ground Power: Most (maybe all) airliners can accept a connection to a Ground Power Unit (GPU), which will supply AC electrical power to run all aircraft systems on the ground. These can be either mobile units (typically powered by Diesel):
How is the SOFC used in a Boeing 737?
The SOFC uses jet fuel as the reformer in the proton exchange membrane to give a 440kW APU that is 75% efficient compared to the conventional 40-45% efficient APU’s. This would give a typical fuel saving of 1,360t for a 737 over a year.