Abstract: This disclosure relates to a heating, ventilating, and/or air-conditioning (HVAC) system. More particularly, this disclosure describes a variable air volume (VAV) multi-zone system that removes cooperating mixing dampers on a typical multi-zone unit with two separate and independent hot and cold deck dampers for each zone. In an illustrative embodiment, the VAV multi-zone system may partition a hot deck and cool deck with damper section zones. Each damper section zone may correspond to a zone within a plurality of zones. A controller within the VAV system may modulate a hot and cold deck damper associated with each damper section zone based on a temperature set point of each zone. The temperature set point may be established through a thermostat located in each zone. A pressure may be maintained by adjusting airflow based on the modulated hot and cold deck dampers for the damper section zones.

Abstract: An air conditioning system duct housing has a plurality of walls coupled together, having at least one outside air intake, at least one return air intake and an air supply outlet channel; a filter; and a receiving aperture (mixed air plenum) to receive the filter therein, wherein the receiving aperture (mixed air plenum) is interposed between the at least one outside air intake, the at least one return air intake and the air supply outlet channel.

Abstract: An air conditioning system duct housing has a plurality of walls coupled together, having at least one outside air intake, at least one return air intake and an air supply outlet channel; a filter; and a receiving aperture (mixed air plenum) to receive the filter therein, wherein the receiving aperture (mixed air plenum) is interposed between the at least one outside air intake, the at least one return air intake and the air supply outlet channel.

Abstract: A catalyst-bed radial gas-flow reactor system is disclosed utilizing a generally cylindrical catalyst bed located in an annualar area between an outer reactor shell and a generally coaxially located displacement member; wherein the gas flow through the reactor is optimized to extend catalyst life by including a non-cylindrical section in at least a portion of the displacement cylinder, and the gas-supply duct entering the reactor shell has baffling arranged to equalize flow velocities across the reactor diameter.