Honeywell upgraded its auxiliary power unit (APU) on the Boeing 737 aircraft, known as High Efficiency Mode, or HEM enabling it to reduce CO2 emissions by up to 2%, increasing efficiency and minimising fuel consumption.   Heath Patrick, president, Honeywell Aerospace, said: “An airline with a fleet of 50 737s could realise as much as $450,000 in annual fuel savings and reduce its emissions by up to 1,100 metric tons of CO2, depending on operating conditions.”   HEM is enabled by a “highly efficient” diffuser, controlled by intelligent software which regulates airflow to the APU compressor section, says Honeywell.  

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