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air heat exchanger utilizing a rigid outer tube and a continuous, flexible inner tube. The corrugated, flexible inner tube is spiralled longitudinally around a center core and creates turbulence in the air which permits a rapid exchange of heat between the exhaust and fresh air streams.
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assigned to SwedSteam AB one side of each frame to form a heat transfer surface" across the:~ndow, the panels being stacked with each alternate panel turned 90 degrees to form first and second air flow paths through the spaces between the plastic films, the frame being made of corrugated cardboard o
## New Patents iii being sent to an expansion turbine-compressor means to recover the work energy theiefrom and to provide at least all the compressed air requirements of the first and second regeneration zones, and preferably in addition the compressed air requirements of the CO-incinerator/combu