Provided is a duct that does not cause defective molding and has a highly sound absorption inner surface which can effectively suppress noise. A duct includes a tubular duct main body and a sound absorption member disposed on the inner surface of the duct main body. The duct has at least one of configurations (1) to (3): (1) the duct main body has a sandwiching part having a pair of opposite wall surfaces, and a side edge of the sound absorption member is sandwiched between the wall surfaces of the sandwiching part; (2) the sound absorption member is pasted to the inner surface of the duct main body with a resin film therebetween; and (3) the sound absorption member and duct main body have parts which are not fused to each other.

The main subject matter of the invention is a ventilation device including at least one duct intended to channel an air flow in an air flow direction inside the duct, the ventilation device including at least one acoustic attenuation member at least partially arranged around the duct and made up of a network of resonators, each resonator having at least one cavity and one neck connecting the cavity to the duct, the resonators that make up the network of resonators being distributed at least parallel to the air flow direction. A distance separating two necks varies along a direction parallel to the air flow direction and in that a volume of the cavities varies along the direction parallel to the air flow direction.

The present inventions is directed to a sensible heat storage apparatus and use thereof. The apparatus comprises an inner vessel (2) comprising an internal volume (3) adapted to comprise a fluid (4); an outer container (5) enclosing said inner vessel; a thermal insulation layer (6) between said inner vessel and said outer container; and at least two integrated connections (71, 72) to connect the internal volume of said inner vessel to an outer environment through the thermal insulation layer. Said integrated connections are adapted to integrate and accommodate at least two individual sub-connections such that every integrated connection forms a single thermal bridge (8) between the inner vessel and outer container and wherein all thermal bridges are located in the bottom 75% of the total height of said outer container.

The present technology provides a non-cylindrical structure for transporting media, including gases, liquids, solids, or energy comprising a layer of thermal pyrolytic graphite (TPG) surrounded by an outer layer and an inner layer comprising a metal, a ceramic, a glass, or a plastic. In particular, the present technology relates to a non-cylindrical tube or a pipe having an inner layer, an outer layer, and a layer of TPG between the inner layer and the outer layer wherein the TPG layer is configured to manage the direction of heat conduction.

A fire-rated conduit assembly. The fire-rated conduit assembly comprises a plurality of pre-fabricated, e.g. factory fabricated, modular sections that are configured to be mechanically assembled to form a continuous fire-rated conduit which is suitable for allowing movement of air, transporting of combustible or hazardous materials, and/or enclosing building mechanical and services.

An air duct sterilization system, and a device and method for producing the air duct sterilization system. The system includes a plurality of ultraviolet light-emitting diodes (UV LEDs), arranged in a UV LED strip within an air duct, configured to destroy airborne biological contaminants in the air duct. The device includes wheel assemblies and an applicator assembly. During installation of the UV LED strip, the wheel assemblies contact a lower surface and an upper surface of an interior of the air duct, thereby enabling the device to roll along the interior of the air duct. The UV LED strip is applied to the upper surface of the interior of the air duct using the applicator assembly, with minimal effort needed from an individual performing the installation. After installation, the UV LEDs are illuminated as needed to destroy airborne biological contaminants, thereby sterilizing the air duct and air therein.

A box type duct with circumferential obtuse angle connection. Unit plates respectively located on the upper, lower and two side surfaces are spliced in the circumferential direction to form a unit pipe section, and the unit pipe sections are spliced in the axial direction to form a box type duct; wherein the unit plate is an arc-shaped corrugated plate arched to the outside of the box type duct, and the adjacent unit plates form an obtuse angle of circumferential connection. The cross section of the duct is in an approximately rectangular box shape, so the utilization ratio of clearance of the duct is high; the unit plate adopts an arc-shaped structure, and by utilizing the pipe-soil joint stressing principle, the strength and bearing capacity of the overall structure are maximized; and the box type duct adopts flat flange or angle steel flange connection in the circumferential direction.

Methods and apparatuses for additively manufactured tubular passages, additively manufactured manifolds, and additively manufactured heaters are provided.

A duct of the present invention includes a pair of groove-shaped members which are formed of sound absorbing sheets and a pair of flange portions which are formed of parts of the pair of groove-shaped members that are extended outward from groove opening edges and which are joined in an overlaid state on each other when the pair of groove-shaped members are arranged such that groove openings are opposed to each other. The pair of flange portions includes a seal portion which is formed by crimping the sound absorbing sheets in parts of the flange portions along the groove opening edges and an outer thick portion which is extended outward from the seal portion and which is formed of the sound absorbing sheet thicker than the sound absorbing sheet of the seal portion.

A flame-resistant, insulated, plastic HVAC duct including a channel configured for conveying forced air and a duct wall forming the channel, the duct wall including a plastic layer disposed between a thermally insulating layer and a metal foil layer. The metal foil layer is arranged to form an outer surface of the duct wall, and the thermally insulating layer is arranged to form an inner surface of the duct wall. A second metal foil layer may be disposed between the thermally insulating layer and the plastic layer.