Abstract: 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.

Abstract: A sound attenuating apparatus for mounting on a heat exchanging apparatus such as a cooling tower, this apparatus having an attenuator housing with vertically extending sides, a top cover and a bottom adapted for mounting on the tower. There is an annular air inlet in the bottom and an air outlet is formed in at least one of the sidewalls. Perforated interior walls are mounted in the housing and define an /airflow passageway that extends from the air inlet to the air outlet. These walls include a first annular wall section extending about and defining an outer circumferential portion of the airflow passageway and a second wall section with that is annular and extends about a substantially vertical central axis. The latter wall section defines an inner circumferential portion of the passageway. The second wall section extends generally upwardly and outwardly from the air inlet. Sound absorbing material is arranged behind the perforated walls.

Abstract: An air handling system for a building having a ceiling and enclosed space, the system including four interconnected induction units for mounting adjacent the ceiling. These units form four sides of a rectangular assembly. Each induction unit includes an air plenum section and an air mixing section connected to a side of the air plenum section and forming an elongate air mixing chamber that extends downwardly to an air outlet. Supporting members mount the induction unit assembly at the ceiling so that each air mixing section when viewed in transverse, vertical cross-section extends at a substantial angle, which in a preferred embodiment is about 90 degrees, to the ceiling during use of the apparatus. Return air is drawn by venturi effect created by a fast flow of primary air into each air mixing chamber and heated or cooled at the heat exchanging coils. The units can provide a mixed air flow that flows downwardly from the outlets.

Abstract: An air duct silencer can be used at the inlet of an air supply fan unit for a building or other large structure. The silencer has an exterior housing with exterior walls forming outer surfaces of the housing and interior walls arranged in the housing, connected to the exterior walls and defining an annular airflow passageway extending between an air inlet located at one end and a circular air outlet adapted for connection to the fan unit. The outlet defines a primary central axis extending through the center of the outlet and perpendicular to a plane in which the outlet lies. A central airflow defining member has a second central axis extending from an outer end thereof to an inner end and this axis is substantially coaxial with the primary central axis. This airflow defining member is substantially circular in transverse cross-section along its length and has a relatively wide bulb like end section at its outer end and a narrow end section at the inner end.

Abstract: An air handling system for use in a building is used in combination with an elevated floor assembly for mounting on a principal floor of the building, this assembly including a working area floor which lies above the principal floor so as to provide an air plenum between the two floors. An outlet attenuator is mounted on the principal floor and extends upwardly through the working area floor, this attenuator including an exterior outlet housing having an air inlet at the top and a lowermost air outlet in at least one vertical side thereof. The air outlet is connected to the air plenum and is connected to the air inlet by a lower airflow passageway defined by interior walls. This attenuator includes sound absorbing material contained in the housing. An axial or centrifugal fan unit is mounted above the outlet attenuator and provides a downward flow of air to the outlet attenuator. There is also an inlet attenuator section mounted above the fan unit and extending upwardly to a ceiling of the building.

Abstract: An air handling system for an enclosed space in a building includes two induction units that can be mounted above a ceiling. Each unit has an elongate air plenum section and an air mixing section forming an air mixing chamber. Air nozzles extend into the air mixing chamber and are mounted on a side of the air plenum section. Each nozzle has an inlet end opening into an interior chamber of the plenum section. Each air mixing section has an air outlet formed at a lower end thereof and a side air inlet for permitting return air to flow into the mixing chamber. Each induction unit is mounted so that the air mixing section extends at a substantial acute angle to the ceiling with the air outlet positioned where the mixing section meets the ceiling. The return air is drawn by a venturi effect created by the nozzles into each mixing chamber.

Abstract: An air mixer for an air distribution system for a building includes a set of fixed, substantially parallel partitions arranged in a spaced-apart, side-by-side manner, these partitions forming alternating primary and secondary air passageways. The primary air passageways are open-ended and extend from a front side to a rear side of the mixer. Front end plates extend respectively across front sides of the secondary air passageways and each has elongate edge portions extending along two opposite longitudinal edges thereof. Each elongate edge portion projects beyond the plane defined by an adjacent one of the partitions. Air flow splitters are mounted in the secondary air passageways and each is connected to an adjacent pair of the partitions. These splitters in operation of the mixer turn incoming air flow that enters the secondary air passageways towards the front end plates.

Abstract: A centrifugal fan system for a building, including a centrifugal fan mounted for rotation about a vertical axis and having a bottom inlet. The fan is mounted in a movable housing having a fan chamber and an air outlet arranged in a side thereof. Wheels are mounted on both sides of the fan housing and engage two elongate track members, that extend horizontally and are mounted on a suitable supporting structure. Thus, the fan and its housing can be moved horizontally away from the top of an input flow concentrator. The housing has an internal, perforated scroll-shaped wall and vertical external walls. Sound insulation is located between the scroll-wall and the external walls. An electrical motor is mounted on the side of the housing and is connected to drive the fan.

Abstract: A fan unit for a building's air handling system comprising a support structure including a front wall with an air inlet opening formed therein and a bladed fan wheel rotatably mounted on the support structure about its central axis and having an axial air intake on a front side thereof confronting the inlet opening. The fan wheel has an annular air outlet extending about its circumference. A fixed centerbody directs air flow into and within the fan wheel and extends along the central axis from a relatively narrow front end located in the air inlet opening to a wider rear end located within the fan wheel. This centerbody has an annular exterior surface which curves outwardly in a section thereof adjacent the wider rear end. The centerbody extends through the axial air intake of the fan wheel. Support struts rigidly support the centerbody in a fixed position. Preferably the centerbody is filled with sound attenuating material.

Abstract: Combined air duct apparatus and silencer for attachment to both the inlet and the outlet of a fan unit for a building wherein each silencing apparatus has an exterior housing with an air inlet and an air outlet, one of which is adapted for connection to the fan unit. The inlet and outlet are connected by an airflow passageway defined by interior walls of the housing. First and second series of splitters are also provided in the outlet duct unit. The splitters in each series are spaced apart to form smaller air passageways and mounted side-by-side in a row. In the outlet duct unit, the air inlet is circular or annular while the outlet is rectangular. In one embodiment, the outlet lies in a plane at a substantial angle to the plane of the annular inlet and the main airflow passageway is substantially curved in its lengthwise direction.