ENVIRONMENTAL CONTROL SYSTEM TRIM AIR HEAT EXCHANGER

An environmental control system includes an environmental control system pack (20) having a trim outlet and a primary outlet. A trim medium (A1b) is output from the trim outlet and a first medium is output from the primary outlet. An inlet of a mixing manifold (102) is connected to the primary outlet of the at least one environmental control system pack. A trim heat exchanger (104) is connected to the trim outlet and the at least one inlet of the environmental control system pack. Within the trim heat exchanger, the trim medium is arranged in a heat exchange relationship with a second medium. From the trim heat exchanger, the second medium is provided to an inlet of the least one environmental control system pack and the trim medium is mixed with a flow output from an outlet of the mixing manifold.