A heat exchanger with centric structure for waste heat recovery is disclosed. The heat exchanger (2) includes an annular heat exchange passage (10) with an array of heat exchange pipes located therein and a bypass passage (6) located concentrically within the heat exchange passage. A valve arrangement (40) is provided to switch the flow of exhaust gas between a duty mode and a bypass mode. The valve arrangement comprises a central chamber and a valve plug (96) that is axially movable between a duty position and a bypass position.

The present invention relates to a grain refrigerator including a housing having a grain storage space formed thereon to discharge grains stored therein, a fixing rod located at the center of the inside lower portion of the housing, dew condensation prevention means fixed to the fixing rod, a support plate located on a top periphery of the dew condensation prevention means, an evaporator disposed on the support plate to generate cool air, and a cooling tube disposed on a top periphery of the support plate on the outside of the evaporator to cool the grains, wherein a first pipe and a second pipe connected to the lower portion of the evaporator pass through a through hole of the support plate and a first drain hole of the dew condensation prevention means and are thus exposed to the outside of the housing.

A coil-wound heat exchanger with mixed refrigerant shell side cooling that is adapted to reduce radial temperature maldistribution by providing tube sheets at one end of a warm bundle that are each connected to tube sheets in a single circumferential zone and are in fluid flow communication with a control valve. Tube sheets at the other end of the warm bundle are each connected to tube sheets in a single radial section and in multiple circumferential zones. A temperature sensor is provided in each circumferential zone. When a temperature difference is detected, one or more of the control valves is adjusted to reduce the temperature difference.

A heat exchanger includes a first set of fins, a second set of fins, and an exterior wall. The first set of fins extend radially and are coaxial with each other. The first set of fins forms a first set of channels. The second set of fins extend radially and are coaxial with each other. The second set of fins forms a second set of channels. Channels of the first and second sets of channels are disposed in an alternating pattern in a circumferential direction of the heat exchanger. The first and second sets of fins are integrally formed together. A cross-sectional width of a channel of at least one of the first set of channels and the second set of channels increases as a radial distance from a centerline axis of the heat exchanger increases.

A heat exchanger with which a fluid to be treated or a generated gas can be prevented from stagnating in a heat transfer part, which can be disassembled for good washability, and which can be coated or lined. The heat exchanger is provided with tow flow passages, i.e. a first flow passage and a second flow passage, within a space formed between an inner tube and an outer tube which are concentric to each other. A spiral heat transfer body is disposed between the inner tube and the outer tube, and the spiral heat transfer body has a cross-sectional shape that is substantially triangular in the axial-direction cross section. The space is partitioned into the first flow passage and the second flow passage by the spiral heat transfer body, and heat is exchanged via the spiral heat transfer body between a first fluid flowing within the first flow passage and a fluid flowing within the second flow passage.

A heat exchanger with which a fluid to be treated or a generated gas can be prevented from stagnating in a heat transfer part, which can be disassembled for good washability, and which can be coated or lined. The heat exchanger is provided with tow flow passages, i.e. a first flow passage and a second flow passage, within a space formed between an inner tube and an outer tube which are concentric to each other. A spiral heat transfer body is disposed between the inner tube and the outer tube, and the spiral heat transfer body has a cross-sectional shape that is substantially triangular in the axial-direction cross section. The space is partitioned into the first flow passage and the second flow passage by the spiral heat transfer body, and heat is exchanged via the spiral heat transfer body between a first fluid flowing within the first flow passage and a fluid flowing within the second flow passage.

Systems, apparatuses, and methods relating to heat transfer devices having nested layers of helical fluid channels. In some examples, a device for transferring heat includes a set of nested tubular walls and a plurality of helical walls intersecting each of the nested tubular walls to form one or more first channel layers nested with one or more second channel layers. Each of the first and second channel layers includes a plurality of helical fluid channels. A first intake and a first outtake are in fluid communication with one another via the plurality of helical fluid channels of each first channel layer, for flow of a first fluid through the device. A second intake and a second outtake are in fluid communication with one another via the plurality of helical fluid channels of each second channel layer, for flow of a second fluid through the device.

A duct comprising: an inlet; an outlet; a shell having a tubular form extending between the inlet and the outlet; a main flow path (H) within the shell for conveying a main flow between the inlet and the outlet; and a heat exchange structure, wherein the heat exchange structure comprises: an intake port provided in the shell; an output port provided in the shell; and a secondary flow path (C) within the shell for conveying a secondary flow between the intake port and the output port, wherein the secondary flow path is spirally intertwined with the main flow path for a section of the duct to provide a heat exchanger within the duct.

A heat exchanger, comprising: a tube bundle having at least one tube for receiving a fluid medium, wherein the at least one tube is wound about a core tube which extends along a longitudinal axis, and a first tube section of the at least one tube rests against at least one web which extends along the tube core and at least one first bracket element for securing the first tube section to the at least one web, the at least one first bracket element having a lower face which faces the first tube section and rests against the first tube section. The invention additionally relates to a securing system and to a method.

A heat exchanger includes a first fluid pathway enclosed in a heat exchanger body to convey a first fluid through the heat exchanger body and a second fluid pathway enclosed in the heat exchanger body to convey a second fluid through the heat exchanger body and facilitate thermal energy exchange between the first fluid and the second fluid. The first fluid pathway and the second fluid pathway together are arranged in a spiral arrangement extending along a central axis of the heat exchanger.