Thread: 787 ECS
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Old 10th Dec 2018, 00:35
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EEngr
 
Join Date: Jan 2011
Location: Seattle
Posts: 623
787 ECS

I was surprised to hear (although my source might be wrong) that the 'No bleed' 787 ECS system still uses an air cycle pack. Instead of R-134a or other phase change refrigerants. Once you have dedicated pressurization turbines (electrically driven) and an electrically driven pack compressor, why not go to a refrigerant requiring lower mass flow (smaller, lighter plumbing and heat exchangers)?

Anyone have a link to a 787 ECS system description and/or trade study between the two system types?
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