A sound attenuating duct unit suitable for connection to an outlet of a gas
turbine and an improved heat recovery apparatus for use with such a
turbine are disclosed. The former unit includes a duct housing having
exterior sides, an air inlet at one end and first and second air outlets.
Interior walls define a main airflow passageway extending from the air
inlet to both of the outlets. Sound absorbing and heat insulation material
is arranged between these walls and the exterior sides. Sound attenuating
members are mounted in the passageway and a diverter damper is mounted in
the housing and is able to direct air flow to either one of the air
outlets. The sound attenuating members are mounted between the diverter
damper and the air inlet. The heat recovery apparatus includes a series of
aerodynamic diffusers mounted in a housing adjacent an air flow inlet
connectable to the gas turbine.
