CPC B64D 13/06 (2013.01) [F25B 11/00 (2013.01); B64D 2013/064 (2013.01); B64D 2013/0611 (2013.01); B64D 2013/0618 (2013.01); B64D 2013/0662 (2013.01)] | 8 Claims |
1. A method of operating an environmental control system of an aircraft comprising:
providing a first medium to the environmental control system including a compressor and a turbine, wherein the first medium is provided to the compressor and the turbine sequentially; and
extracting work from a second medium provided to a power turbine operably coupled to the compressor to drive the compressor;
wherein in a first mode of operation, the first medium to be provided to a downstream load is output from the turbine, in a second mode of operation, at least a portion of the first medium to be provided to a downstream load bypasses the turbine, and in a third mode of operation, at least a portion of the first medium output from the compressor is provided to the power turbine.
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