A fan heater for heating using exhaust waste heat, including: a natural exhaust tube discharging some exhaust gas from a water heater; a forced exhaust tube connected to the natural exhaust tube in a parallel structure, the remaining exhaust gas, excluding naturally discharged exhaust gas, flowing into the forced exhaust tube; a heat exchange device on the upper portion of the forced exhaust tube and supplied with high-temperature exhaust gas; a forced exhaust blower installed on the heat exchange device to draw exhaust gas from the forced exhaust tube and discharge it; a main unit having the heat exchange device embedded therein and having a circulation unit such that low-temperature indoor air circulates into the heat exchange device; a warm-air circulation blower supplying the indoor air towards the outer air circulation unit and circulating the low-temperature indoor air so the exhaust gas exchanges heat; and a control unit.

A heat exchange system for commercial kitchen installations, having a dedicated plenum to receive combustion emissions separate from cooking emissions, where the plenum has a heat exchange structure that efficiently and directly draws heat from the combustion emissions. The plenum heat exchange structure reduces the air volume that a ventilation hood covering the kitchen appliances needs to process and filter, while concurrently obtaining heat from combustion emissions without interference from cooking emission effluents such as grease, smoke, or particulate matter. Heat drawn out of the combustion emissions can be stored in a thermal reservoir for powering other parts of the commercial kitchen or other uses. The diverted airstream from combustion emissions, once passed through the heat exchange structure, can further ventilate through an additional heat exchanger, to provide tempered air to an interior location, such as the commercial kitchen via an air supply duct in the cooking emission ventilation hood.

A heat exchanger for cooling product gas generated from biomass includes a cylindrical main body, a rod-shaped component, a gas inlet and a gas outlet. The cylindrical main body has a circumferential cladding. An annular flow channel is formed in the cylindrical main body around the rod-shaped component, which extends axially in the main body. The gas inlet and gas outlet are disposed towards opposite ends of the main body. The gas inlet is tubular and enters the annular flow channel tangentially to the circumferential cladding and perpendicularly to the axial direction of the cylindrical main body. The velocity of the cooling product gas is maintained by making the cross-sectional area of the gas outlet smaller than that of the gas inlet. A helical shaped guide plate is disposed in the annular flow channel and has an outer circumferential edge that seals against an inner surface of the circumferential cladding.

A pulse combustion heat exchanger having a longitudinal axis is configured to accept oxidant and fuel and output a cooled combustion stream. The pulse combustion heat exchanger includes an oxidant inlet section that accepts oxidant, a fuel inlet section that accepts fuel, a mixing section that mixes oxidant with fuel, a combustion section that receives the oxidant and fuel and produces a pulsating combustion stream, and a heat transfer section configured to receive the pulsating combustion stream, the heat transfer section includes one or more resonance conduits. Coolant is employed at a plurality of longitudinally spaced-apart transition sections to remove heat.

A heat exchanger includes a lamellar structure of a plurality of parallel heat exchange elements with an intermediate air gap between each pair of adjacent heat exchange elements. Along a longitudinal direction of the lamellar structure the heat exchange elements is interconnected in a top portion of the lamellar structure that forms an inlet channel through the heat exchange elements and in a bottom portion of the lamellar structure that forms an outlet channel through the heat exchange elements.

The heat exchange elements form parallel channels between the inlet and the outlet channels.

In the outlet channel, the heat exchanger includes a filler body, that is filling up a lower level of the outlet channel and forms a floor along the longitudinal direction of the lamellar structure.

The present invention relates to a combustion apparatus capable of reducing the combustion load of a burner and improving the combustion efficiency thereof. The combustion apparatus includes: a premixing chamber for premixing external air, introduced through an air supply inlet, with a combustion gas; a blower for supplying a mixed air premixed in the premixing chamber toward a burner; a combustion chamber for burning the mixed air by ignition of the burner; a heat exchanger for heat exchange with room heating water by using the combustion heat of the combustion chamber; an exhaust gas discharging part for discharging an exhaust gas having passed through the heat exchanger; and a duct through which the exhaust gas having passed through the exhaust gas discharging part is discharged outside, wherein the combustion apparatus includes an air intake preheater for heat exchange between the exhaust gas discharged to the duct through the exhaust gas discharging part and the air supplied to the premixing chamber through the air supply inlet, the air intake preheater including a channel-forming member in which a plurality of unit plates are stacked with a predetermined interval therebetween to form an exhaust gas channel and an air intake channel therein that are separated from each other, are adjacent to each other, and are alternately arranged.

An apparatus for cleaning a surface, such as the surface of a rotating disk, the apparatus comprising an articulating arm associated via a linkage to a rotating member driven by a motor. Rotation of the rotating member causes linkage to move the articulating arm in an oscillating pattern. A nozzle associated with the distal end of the articulating arm can convey pressurized air or liquid from a source to a surface in an oscillating pattern based on the construction of the arm, linkage, the rotating member and the speed of rotation.

The heat recovery system is a heat transfer device that is configured for use with an HVAC. The heat recovery system captures waste heat that is generated by an exothermic chemical reaction (such as combustion). The heat recovery system transports the captured waste heat to an HVAC. The captured waste heat is used to increase the temperature of air that is drawn into the heat recovery system from the environment. The heated air is discharged into the HVAC. The heat recovery system incorporates a radiator structure, an exterior shell, and a fan structure. The radiator structure is contained in the exterior shell. The fan structure mounts on the exterior shell. The heat recovery system: a) draws air in from the environment; b) heats the drawn air over the radiator structure; and, c) discharges the heated drawn air into the HVAC.

A heat recovery system for recovering waste heat from exhaust gases that are expelled through a flue that are generated as a byproduct from a heating system, comprises a venting arrangement that connects to the flue from the heating system and a motorized damper to direct the exhaust gases from the flue through the venting arrangement to an intake plenum. The intake plenum directs the exhaust gases to a heat exchanger that comprising a series of serpentine conduits between which the exhaust gases pass through. The heat exchanger is connected to exhaust plenum which is in turn connected to an exhaust fan that draws the exhaust gasses through the heat recovery system. The heat exchanger further comprises a series of inlet ports and outlet ports that add and remove coolant to the serpentine conduits at selected temperatures.

The air sterilizer comprises a housing (1), at one end of which there is an air inlet unit (5) in which a fan (3) is arranged in a fixed manner; a spiral plate heat exchanger (2) arranged in the housing (1), in the center of which an electric heating unit (7) is arranged; an air outlet unit (6) at the other end of the housing (1); wherein the spiral plate heat exchanger (2) has an air inlet duct (31) running from the air inlet unit (5) to the electric heater (7) and a counterflow air outlet duct (32) running from the electric heater (7) to the air outlet unit (6), which ducts (31, 32) run helically next to each other. At one end of the housing (1) of the air sterilizer, adjacent to the air inlet unit (5), an air outlet (18) is formed on each side of the housing (1). Each side of the spiral plate heat exchanger (2) is sealed by an end cover. An air inlet (19) is formed on the end covers, which opens into the air inlet duct (31) running to the electric heating unit (7). A guide hole is formed in the end cover for a temperature sensor in which a temperature sensor is accommodated. In the spiral plate heat exchanger (2), there is a constant distance between the plates forming the air inlet duct (31) and the air outlet duct (32). The end covers have a heat-insulated side cover on each side of the air sterilizer, which side covers are sealed to the housing (1) and define a respective chamber which establishes flow communication between the air outlet and the air inlet on the same side of the air sterilizer.