Abstract: The present inventive concept relates to a method for determining a flow metric for a flow of granular particles, the method comprising: performing, using a radar sensor, a plurality of radar measurements distributed over a measurement time period comprising: transmitting radar pulses through the flow and in a direction across the flow, receiving reflected signals, and sampling the reflected signals; estimating, using a radar signal processor and based on the samples, a variation over time of an amplitude of the reflected signals; and determining, using the radar signal processor, the flow metric based on the estimated variation, wherein the flow metric is indicative of a flow rate of the flow of granular particles.

Abstract: An apparatus (1) and method for introducing a foil (10) to be laminated to an inner surface (15) of an elongated duct (6), wherein the foil is providable on an axle (2), the axle being movable from a first position outside of the duct, where the foil is provided on the axle, to a second position inside the duct where the foil is in position for lamination to the inner surface of the duct.

Abstract: A duct of fiber material and binder agent, at least two fold lines are present lengthwise for providing a foldability of the duct by weakened material along the fold lines. The duct is pushable into a folded state and the material remembers the original shape and return to its original shape when released from a folded state. A method of manufacturing a duct: applying a web of origin fiber material with binder agent to a core and compressing the web by an outside form under the influence of heat against the core, wherein the core and/or the outside form is provided with a number of lengthwise ridges corresponding to the desired number of fold lines, to a third of the original thickness of the sides and at the ridges a tenth to a twentieth of the original thickness, and in that the fiber and binder agent web weighs 1.5-3 kg/m2.

Abstract: The present invention concerns a foldable duct (4) made of glass or stone fibers and binder agent having a foil (1) laminated thereon, on the inside and outside of the duct, wherein the foil (1) at least comprises: an outer layer of aluminum (5), an intermediate layer of a thermoplastic polymer (6) having a lower melt point than polyethylene, positioned closest to the outer layer of aluminum (5), an intermediate layer of polyethylene (7), positioned between the intermediate layer of thermoplastic polymer (6), and an inner layer of a thermoplastic polymer (8) having a lower melt point than polyethylene.

Abstract: The present invention concerns a foldable duct (4) made of glass or stone fibres and binder agent having a foil (1) laminated thereon, on the inside and outside of the duct, wherein the foil (1) at least comprises:—an outer layer of aluminium (5),—an intermediate layer of a thermoplastic polymer (6) having a lower melt point than polyethylene, positioned closest to the outer layer of aluminium (5),—an intermediate layer of polyethylene (7), positioned between the intermediate layer of thermoplastic polymer (6), and—an inner layer of a thermoplastic polymer (8) having a lower melt point than polyethylene.

Abstract: A duct of fibre material and binder agent, at least two fold lines are present lengthwise for providing a foldability of the duct by weakened material along the fold lines. The duct is pushable into a folded state and the material remembers the original shape and return to its original shape when released from a folded state. A method of manufacturing a duct: applying a web of origin fibre material with binder agent to a core and compressing the web by an outside form under the influence of heat against the core, wherein the core and/or the outside form is provided with a number of lengthwise ridges corresponding to the desired number of fold lines, to a third of the original thickness of the sides and at the ridges a tenth to a twentieth of the original thickness, and in that the fibre and binder agent web weighs 1,5-3 kg/m2.

Abstract: An apparatus (1) and method for introducing a foil (10) to be laminated to an inner surface (15) of an elongated duct (6), wherein the foil is providable on an axle (2), the axle being movable from a first position outside of the duct, where the foil is provided on the axle, to a second position inside the duct where the foil is in position for lamination to the inner surface of the duct.

Abstract: A duct includes a number of wall sections which are at least partly produced from fiber material and a binder agent. Together, the wall sections define a closed, elongate flow space. The wall sections which meet one another are united by the intermediary of at least one longitudinal fold or joint line. In the fiber material and the binder agent of the duct, there are disposed longitudinal rigidifying elements. On the outside of the duct, there are longitudinal bead-liked projections which include the fiber material and the binder agent.

Abstract: A connecting piece for a duct such as a ventilation duct is provided and includes an inner flow space in communication with the interior of the duct, the connecting piece having at least one joining portion on which an end region of the duct is slidable and fixable. The connecting piece includes a compressed fiber material and a binder. The connecting piece displays a substantially configurationally stable portion in association with the joining portion, and the connecting piece displays, at least interiorly, a layer which is impervious to a fluid, in particular a gas, this layer being adjacent the inner flow space of the connecting piece.

Abstract: A heat exchanger includes two sets of channels arranged adjacent to each other, for beat exchange between a first and a second air stream. Each of the sets of channels includes at least one transversal drainage channel for drainage of condensate, and a ventilation assembly including such a heat exchanger.

Abstract: A duct includes a number of wall sections which are at least partly produced from fibre material and a binder agent. Together, the wall sections define a closed, elongate flow space. The wall sections which meet one another are united by the intermediary of at least one longitudinal fold or joint line. In the fibre material and the binder agent of the duct, there are disposed longitudinal rigidifying elements. On the outside of the duct, there are longitudinal bead-liked projections which include the fibre material and the binder agent.

Abstract: A ventilation duct includes a refractory fibre material and binder agent and has longitudinal wall sections and longitudinal fold- or joint lines located there between. The wall sections between the fold- or joint lines have longitudinal, thickened and outwardly bulging portions in which longitudinal rigidifying dements are disposed. A method of manufacturing the ventilation duct includes manufacturing the duct in the planar, spread-out state, wherein the wail sections which are located along opposing edges of the spread-out duct, are given a configuration which corresponds the configuration of half of the other wall sections, whereby the duct, after raising to the intended configuration, is given a longitudinal joint where the half wall sections meet one another.

Abstract: A connecting piece for a duct such as a ventilation duct is provided and includes an inner flow space in communication with the interior of the duct, the connecting piece having at least one joining portion on which an end region of the duct is slidable and fixable. The connecting piece includes a compressed fiber material and a binder. The connecting piece displays a substantially configurationally stable portion in association with the joining portion, and the connecting piece displays, at least interiorly, a layer which is impervious to a fluid, in particular a gas, this layer being adjacent the inner flow space of the connecting piece.

Abstract: A method for recovering heat and humidity in a ventilation system includes cooling warm and humid exhaust air at a condensation surface in a heat exchanger and collecting the condensate as formed, heating dry and cold supply air at the opposite side of the condensation surface and atomizing the condensate and supplying the atomized condensate to the supply air at the supply air inlet of the heat exchanger. The atomizing is generated b a piezoelectric atomizer. A device for recovering heat and humidity in a heat exchanger in a ventilation system includes a condensation surface at the exhaust air side of the heat exchanger and a collection device for condensate. At the inlet of the supply air side of the heat exchanger there is provided a piezoelectric atomizer that is fed with the condensate for supplying atomized condensate to the inlet.

Abstract: A duct element (1) for an air flow or for a gas flow and a method for manufacturing, handling and mounting the duct element (1). The novel duct will replace ducts of steel and thus have enough restraint towards flexure to be hung without any substantial flexure in connection to a mounting procedure. The advantages are a substantial reduction in price per meter of duct installed, and it makes manufacturing, handling and mounting easier as well as transportation and storing as the duct (1) can be folded or rolled in a flattened and space saving condition. The duct (1) can be bent in a mounted position, i.e. be allowed to be changed in direction having a minimum radius of about 1000 mm.