Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube along which water flows, and which is housed inside the casing and coils about the first axis to form a helix made of a succession of turns; and deflecting means for directing the fumes between successive turns; the tube being provided with a first and a second fins, which extend along the length of the tube, face one another, and are tangent to the tube.

Abstract: A dispenser of cooled or heated liquid which in one embodiment is a server cart for an aircraft. To avoid the need for a pump, the reservoir has a cooling or heating heat exchanger that helically coils around the main reservoir, which cools from the top down or heats from the bottom up, forming a counter current. The reservoir is connected to at least two conduits, one near the cooler top of the reservoir and one near the relatively warmer bottom of the reservoir. The two conduits connect to one another at a distance from the reservoir forming a dispensing passage, thereby allowing fluid to constantly circulate through the dispensing passage due to difference in the specific gravity in the fluid caused by the temperature difference. The elimination of the pump device is especially desirable for weight sensitive environments such as an aircraft.

Abstract: A clothes dryer is provided. In the dryer, air flowing into a drying container is provided with heat from heat pump. The clothes dryer comprises a cabinet, a drying container rotationally mounted in the cabinet, a motor providing the container with rotational force, a first air path connected to a side of the container, a second air path connected to another side of the container and to the outside of the cabinet, and a first heat exchanging member and a second heat exchanging member in the first air path. A damper may be additionally included in the second air path.

Abstract: A shell-and-tube heat exchanger for the treatment of juices and juice-type foodstuff products with medium to high viscosity, with at least one jacket tube containing at least one inner tube, whereby the inner tube and/or the jacket tube is or are formed as a swirl tube with multi-start spirals running like a thread at an angle to the tube axis, a crossed and twisted tube with crossing spirals at least essentially symmetrical to the tube axis, each with an angle of incidence between 67° and 72° to the tube axis, i.e. with an angle of twist of 23° to 18° to the tube axis, is used as an inner and/or outer tube. The spiral depth is about 0.8 mm to 1.2 mm.

Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.

Abstract: The invention relates to a geothermal system for exchanging heat with the water of a public supply line, wherein the heat exchanger is arranged within the supply line and is used in modular form as a pipe section.

Abstract: A spiral heat exchanger for producing heating and/or sanitary use hot water, specifically designed for condensation applications, characterized in that said spiral heat exchanger comprises a duct, preferably though not exclusively made of a thermally conductive material and having a contoured cross-section, called outer duct, inside which can be either arranged or not a second duct, preferably though not exclusive made of a thermally conductive material, called inner duct; the geometrical construction of said outer duct being defined as a resultant obtained by joining two different diameter circumferences, said circumferences being spaced from one another by a constant or variable radius junction pattern; the thus obtained single or double duct being coiled or spiral wound on a diameter substantially larger than the size of said duct thereby providing a hollow cylinder.

Abstract: A compact shell and coil heat exchanger is disclosed that accommodates widely differing volumetric flowrates between the two fluids undergoing heat exchange. Multiple co-coiled helical coils of tubing are concentrically arranged, and coil spacers are provided which maintain the tubes in overall staggered alignment, as illustrated in FIG. 1. Uniformly high transfer coefficients are maintained throughout the bundle of coils via means for ensuring that the tube-side flow through the tubes of each coil, and the shell-side flow across each coil, are kept proportional to the tube surface area of each coil.

Abstract: A method for modifying the processing capabilities of a container. The method includes providing a container that defines a cavity and comprises a wall. The wall defines at least a portion of the cavity and has thermal energy transfer characteristics. At least one of the thermal energy transfer characteristics comprises a first value. Changing the first value of the one thermal energy transfer characteristic to a second value for at least a first portion of the wall, the second value being different from the first value.

Abstract: An electric motor/generator cooling mechanism is presented. The cooling mechanism includes a hollow cooling jacket having an inner and outer coaxial surface, where the inner surface defines a generally cylindric cavity for receiving a stator in heat transference contact with the inner surface, and the outer surface has a cast spiral groove section with jogged cooling passages. The disclosure includes an outer case having one or more inlet ports, an outlet port, and a vent for purging air, cooling fluid flowingly encased between the cooling jacket and the outer case, flowing through the jogged cooling passages, and a flanged end surface on an end of the outer case for boltingly connecting the cooling jacket to the outer case.

Abstract: A spiral double-tube structure including an inner tube for introducing a solvent vapor resulting from vaporization within a distillation still and an outer tube which a coolant gas cooled by an outdoor machine is passed through is disposed in a buffer tank; the solvent vapor is directly cooled from the surrounding area by the coolant gas with a large temperature difference and thus condensed into a liquid state; by means of an ejector, the liquid is mixed with the solvent suctioned from the buffer tank and returned into the buffer tank; since the solvent in the buffer tank is also directly cooled by the coolant gas, the cooling efficiency is high; accordingly, both the solvent vapor generated from the distillation still and the solvent in the buffer tank for reducing the pressure inside the distillation still can be efficiently cooled without using cooling water, and downsizing of the apparatus can also be attained.

Abstract: Disclosed is a double pipe heat exchanger for a boiler supplying heating water and hot water, which can prevent water from being condensed even if cold heating water or cold water is introduced into an inlet of the heat exchanger in the boiler for supplying heating water and hot water The heat exchanger includes: a plurality of outer heating water pipes to which combustion heat is applied from a burner of a combustion chamber; a plurality of inner pipes, each of which is inserted in each outer pipe; a returned heating water pipe in which cold heating water is introduced; and a cold water pipe in which cold water is introduced, wherein the returned heating water pipe and the cold water pipe are connected to one of the inner pipes.

Abstract: A heat exchanger element (30) formed from an inner copper tube (32) and an outer copper tube (34). The entire outer surface of the inner tube (32) is substantially in contact with the entire inner surface of the outer tube (34).

Abstract: In a temperature control device, a plurality of screening cylinders each having a different diameter are concentrically arranged within a liquid tank to concentrically form a plurality of layered channels which are communicated to define a circulation passage through which constant-temperature fluid flows. A heat transfer tube through which liquid chemical flows is disposed in any one of the channels such that heat exchange between the liquid chemical and the constant-temperature fluid is performed via the heat transfer tube for controlling temperatures of the liquid chemical.

Abstract: A heat exchanger includes a body 4 on the surface of which are provided helical or spiral paths 5 which will provide multiple and turbulent flow paths A for a first fluid such as water which is caused to flow through chamber 3 relative to a spirally wound heat exchange tube 6 and in a heat transfer relationship with a second fluid flowing through the tube 6. The tube 6 has one or more further helical or spiral flow paths 9 on its external surface. The multiple flow paths A will extend the residence time for the first fluid within the heat exchanger 1 and this together with the turbulence will maximise heat transfer. Preferably a portion of the first fluid flow will be through a central aperture in body 4 where turbulence is also created by the helical or spiral paths of the tube 6 as it extends through the aperture.

Abstract: The present invention discloses a hybrid combustor, such as an anode tailgas oxidizer (ATO), for fuel processing applications which combines both flame and catalytic type burners. The hybrid combustor of the present invention combines the advantages of both flame and catalytic type burners. The flame burner component of the hybrid combustor is used during start-up for the preheating of the catalytic burner component. As soon as the catalytic burner bed is preheated or lit off, the flame burner will be shut off. Optionally, the hybrid combustor may also include an integrated heat recovery unit located downstream of the catalytic burner for steam generation and for the preheating of the feed for a reformer, such as an autothermal reformer.

Abstract: A ventilating air and airflow control in a ventilating, heating or air conditioning system is provided. A structure and method to provide air flow mixture via an air mixer structure or ‘baffle’ located within a blend door are provided. The simplified HVAC unit provides a baffle/blend door assembly comprising an air mixer structure wherein the attachment means of baffle and barrel door is such that it provides for ease of assembly. The baffle/barrel door assembly provides for smaller packaging volume with the same functionality as larger HVAC units.

Abstract: A heat exchange apparatus has a housing, a first fan cooperative with the housing for drawing air through the housing, an air flow line extending within the housing, a second fan connected to the air flow line for drawing air along the air flow line, and a coolant tube extending in a helical pattern around in the air flow line. A conduit extends over and around the coolant tube and the air flow line. The second fan passes air in heat exchange relationship to the coolant tube interior of the conduit. The housing can be placed forwardly of an engine of a vehicle.

Abstract: In a first aspect of the present invention, a header for a heat exchanger is disclosed that has an inflow side, an outflow side, a bypass port therebetween, and a pressure-sensitive flapper valve proximal the bypass port. As pressure increases at the inflow side of the header, the flapper valve opens proportionally, and, as pressure decreases at the inflow side, the flapper valve closes proportionally. In a second aspect of the present invention, a tube-in-tube heat exchanger is disclosed that includes a helical tube-in-tube assembly adapted for flow therethrough of a plurality of fluids for heat transfer therebetween. In a third aspect of the present invention, a heat system is provided to include an embodiment of the header and an embodiment of the tube-in-tube heat exchanger, so as to provide a bypass of the tube-in-tube heat exchanger under a pressure condition.

Abstract: A heat exchanger comprising hollow thermoplastic tubes, which are fusion bonded with a thermoplastic resin to form unified terminal end blocks (32, 34), is disclosed. The hollow tubes may be shaped by plaiting or braiding the tubes into cords (70, 72) and then thermally annealing the cords (70, 72) to set the crests and bends of the plait or braid. The cords (70, 72) provide improved flow distribution of fluid about the hollow tubes in the heat exchanger. The heat exchanger is chemically inert and is useful for cross-flow filtration, as well as for heat- and mass-transfer applications in harsh chemical environments.

Abstract: A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.

Abstract: A coil on tube heat exchanger is provided that uses multiple parallel helical coil tubes to limit liquid pressure losses while providing similar performance and production times to previous coil and tube designs. Two or more coil tubes are wrapped together around a tube in a helical fashion, permitting the heat exchanger to be used in a counter-flow, or contra-flow, implementation. The system preferably includes a header, or manifold, to connect two or more of the coil tubes together at the beginning and/or end of the tube. However, each individual coil may be connected to a separate load and kept independent. Embodiments of the present invention provide reduced pressure loss, higher performance and are generally faster to manufacture than prior heat exchangers.

Abstract: A heat exchanger transfers heat between primary and secondary fluid coolants. A housing has a longitudinal central axis lying within a transverse housing plane. A bottom wall with a concave inner surface faces upward and extends along the central axis. A plurality of arcuately helical lower sector fins are spaced apart along the central axis on the bottom wall inner surface. A cover has a longitudinal central axis lying within a transverse cover plane. A top wall with a concave inner surface faces downward and extends along the central axis. A plurality of arcuately helical upper sector fins are spaced apart along the central axis on the top wall inner surface. A copper tube is assembled into the housing in a direction transverse to the housing axis with the tube closely adjacent the lower sector fins. First and second sealing means seal the tube ends to the housing. The cover is assembled into the housing in a direction transverse to the housing axis with the upper sector fins closely adjacent the tube.

Abstract: A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.

Abstract: A cooling apparatus (10) for cooling a detector (52), the cooling apparatus including an inner and an outer countercurrent heat exchanger (12 and 14, respectively) for a first and a second gas in a thermally insulating housing (16), the inner countercurrent heat exchanger (12) being arranged within a sublength of the outer countercurrent heat exchanger (14), and the inner countercurrent heat exchanger (12) being spatially separated from the outer countercurrent heat exchanger (14) by an outer sleeve (18). In this apparatus, the outer sleeve (18) has a partition plate (32) between an expansion nozzle (28) for the first gas located at the end of the inner countercurrent heat exchanger (12) and the remaining part of the outer countercurrent heat exchanger (14).

Abstract: A heat exchanger has a first thermally conductive tube for conducting a fluid and a second thermal conductive tube for conducting a fluid. The first thermally conductive tube forms a first loop while the second thermally conductive tube forms a second loop. The first loop neighbors the second loop.

Abstract: A system in which a heat exchanger includes a core, a plurality of fins extending outwardly from the core, and an element disposed within the cavity of the core. The heat exchanger also includes a first cap coupled to the first end of the core, and a second cap coupled to the second end of the core where the second cap comprises an inlet and an outlet.

Abstract: An internal combustion engine is provided in which the temperature of an exhaust gas gradually decreases from its upstream side to its downstream side, and the temperature of a working medium of a heat exchanger, which flows in the opposite direction to the exhaust gas, gradually increases from its upstream side to its downstream side. The temperature difference between the exhaust gas temperature and the working medium temperature is the smallest at the interface between a liquid phase region and a two-phase region of the working medium, and since a catalyst device is incorporated at the upstream side, relative to the flow of exhaust gas, of the vicinity of the position where the temperature difference is the smallest, it is therefore possible for the heat exchanger to utilize the heat generated by the catalyst device effectively.

Abstract: A heat exchanger specifically intended to act as a water heater by heating water utilizing heat rejected from a gaseous refrigerant in a refrigeration system includes first and second, generally parallel, spaced tubular water headers (10,12) with a plurality of water tubes (14) extending in spaced relation between the water headers (10,12) and in fluid communication therewith. An inlet (16) is provided to one of the headers (10) and water outlets (20,28,30) are provided from at least one of the water headers (10,12). A plurality of gas tubes (32), at least one for each water tube (14), are helically wound about a corresponding one of the water tubes (14) and have opposed ends (34,36) connected to respective ones of first and second, generally parallel, spaced gas headers (40,42).

Abstract: A shell and coil type heat exchanger evaporator provides cooling for industrial coolants characterized by high viscosity and a poor heat transfer coefficient. A large heat transfer surface area is provided within a limited volume, and without a high coolant pressure drop. A short initial cool down period is provided due to minimized heat exchanger mass and minimized volume of liquid coolant in the heat exchanger during initial cool down.

Abstract: A cooling unit adapted for use in a freezing mechanism, which is composed a metallic cylindrical evaporator housing and a metallic freezing pipe helically wound on an outer periphery of the evaporator housing for thermal contact with the evaporator housing, wherein the freezing pipe is embedded in a metal layer formed by slip casting of a low melting point alloy such as aluminum alloy, tin alloy or magnesium alloy on the outer periphery of the evaporator housing.

Abstract: An internal combustion engine waste heat recovery system is provided in which a second heat exchanger, a fifth heat exchanger, a fourth heat exchanger, a third heat exchanger, and a first heat exchanger are disposed sequentially from the upstream side to the downstream side of the flow of exhaust gas in an engine exhaust passage. Water, used as a working medium, is supplied sequentially to the first, second, third, fourth and the fifth heat exchangers. Water having the lowest temperature can be supplied to the first heat exchanger on the most downstream side of the gas flow, to which exhaust gas having a comparatively low temperature is supplied. Water having a comparatively low temperature, which has passed only through the first heat exchanger, can be supplied to the second heat exchanger on the most upstream side.

Abstract: An application specific heat sink assembly for dissipating heat from one or more electronic components is presented with a heat-dissipating substrate selected for one or more of its size, shape, mass, cost, thermal conductivity, or environmental resistance properties; and one or more heat-dissipating studs. Each heat-dissipating stud may be attached to the heat-dissipating substrate such that an electronic component may be attached to each heat-dissipating stud with the heat-dissipating stud providing CTE transition between the heat-dissipating substrate and the electronic component to be cooled. At least one of the heat-dissipating studs may have an upper layer with a CTE similar to the electronic component's CTE and one or more intermediate layers between the upper layer and the heat-dissipating substrate to provide CTE stepping between the CTE of the heat-dissipating substrate and the CTE of the upper layer of the heat-dissipating stud.

Abstract: A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.

Abstract: A heat exchange apparatus (10, 10, 10b) for selectively heating and/or cooling a process fluid (38). A process fluid tubing 14 is wrapped around a primary thermally conductive cylinder (12) having a spiral groove (24) therein adapted for closely accepting the process fluid tubing (14) and increasing the area in thermal contact therebetween. The process fluid tubing (14) is a generally chemically inert tubing. The spiral groove (24) supports the process fluid tubing (14) such that the process fluid tubing (14) can be bent in a radius smaller than the natural minimum bend radius of the process fluid tubing (14). Various embodiments have a cooling apparatus (26, 26a) for cooling the process fluid (38). The cooling apparatus (26, 26a) has a outer thermally conductive cylinder (16) or an outer thermal reservoir (50) cooled alternatively by coolant fluid (44) passing through cooling fluid tubing (18), by a plurality of thermoelectric modules (54), or by a combination thereof.

Abstract: A heat exchanger for swimming pools, formed of an essentially cylindrical housing through which a first medium flows axially, while a second medium flows through a conduit that is installed in the housing and that is fashioned as a coil. The coil-shaped conduit is formed of a corrugated hose, and has separate connections for the second medium, or for the corrugated hose. The corrugated hose is connected at its end segments to separate connections for the second medium via a plug connection. The connections extend from the outside to the inside of the housing, passing through the housing.

Abstract: The invention relates to an air conditioning unit with a coolant circuit which consists of a compressor, an evaporator, a collector located at the low pressure side between the evaporator and the compressor and an inner heat transfer unit with a beat transfer channel located at the high pressure side and a low pressure side beat transfer channel. According to the invention, the inner heat transfer unit has an at least segmentally spiraling and/or spiral-shaped steps between the outer and inner pipe of a coaxial pipe system.

Abstract: A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.

Abstract: A heat exchanger consists of an outer casing, core tube device, flow guide plate and sealing means. The outer casing comprising the lower and upper outer casings has the front and rear enclosed plates fixed to both ends to form a closed casing. The core tube device provided at the middle portion of the outer casing includes a core tube body, end enclosed plates and heat exchanging copper tubes. The flow guide plate is located between the inner wall of the outer casing and the outer wall of the core tube body with the sealing means provided between the upper and lower outer casings and secured into an integral casing by bolts and nuts. The exhausted hot water enters the heat exchanger from the inlet on the outer casing and exits the outlet while the clean tap water enters the heat exchanger from the opposite inlet provided on the core tube device.

Abstract: Combustion engine (M), especially an Otto engine or diesel engine for land and water vehicles, has an exhaust system with an exhaust catalyst (20), integrated in the exhaust pipe (L), and a catalyst cooling device (26) fed with a fluid or pasty coolant (14), preferably water, glycerin or a gel. Also claimed is a silencer, especially for the above combustion engine, having a silencer cooling device fed with a fluid or pasty coolant. Preferably, the cooling device (26) forms a housing (G) for the catalyst (20) or silencer, respectively.

Abstract: An energy exchanging apparatus is constructed to include an energy source adapted for providing/delivering energy, a shell provided around the energy source and adapted for delivering a fluid to make an energy exchanging action with the energy source, and a spiral member provided inside the shell and spirally extended around the periphery of the energy source and defining a spiral flow path for guiding the fluid spirally over the periphery of the energy source.

Abstract: An ice cream machine for cooling liquid ice cream into frozen ice cream includes an evaporator system with a secondary evaporator. The evaporator system can be a flooded evaporator or evaporator having an auxiliary tank or section of the evaporator that can ensure that a cooling chamber is surrounded by liquid refrigerant during normal operation. The secondary evaporator ensures consistent temperature within the evaporator during periods of low sales, hold modes, or non-production modes.

Abstract: The invention relates to a spiral heat exchanger including at least two spiral sheets (1, 2) extending along a respective spiral-shaped path about a common center axis (x) and forming at least two spiral-shaped, substantially parallel flow channels (4, 5). Each flow channel (4, 5) permits a heat exchange fluid to flow in a substantially tangential direction with respect to the center axis (x). Each flow channel includes a radially outer orifice, which forms an outlet or an inlet of the respective flow channel and which is located at a radially outer part of the respective flow channel and a radially inner orifice, which enables communication between the respective flow channel and a respective inlet/outlet chamber (13, 14). The center axis (x) extends through the inlet/outlet chamber of the radially inner orifice. The spiral heat exchanger includes a center body (3) extending around the center axis (x) and being closed with respect to the flow channels (4, 5).

Abstract: A heat exchanger having an intermediate heating medium has a shell of the heat exchanger, a plurality of cylindrical partition tubes each of which has an annular space therein and is closed at both end portions thereof with annular walls, the cylindrical partition tubes being arranged concentrically in a mutually spaced manner in the shell, and helical coil-shaped heat exchanger tubes each of which is disposed in the annular space in the cylindrical partition tube. A high-temperature heating medium flows in the shell through clearances among the helically arranged multiple cylindrical partition tubes, a low-temperature heating medium flows in each of the helical coil-shaped heat exchanger tubes, and an intermediate heating medium chemically inactive with respect to both the high-temperature heating medium and the low-temperature heating medium and excellent in the heat transferring performance is passed through each of the annular spaces in the cylindrical partition tubes.

Abstract: A heat exchanger having an intermediate heating medium comprises a shell of the heat exchanger, a plurality of cylindrical partition tubes each of which has an annular space therein and is closed at both end portions thereof with annular walls, the cylindrical partition tubes being arranged concentrically in a mutually spaced manner in the shell, and helical coil-shaped heat exchanger tubes each of which is disposed in the annular space in the cylindrical partition tube. A high-temperature heating medium flows in the shell through clearances among the helically arranged multiple cylindrical partition tubes, a low-temperature heating medium flows in each of the helical coil-shaped heat exchanger tubes, and an intermediate heating medium chemically inactive with respect to both the high-temperature heating medium and the low-temperature heating medium and excellent in the heat transferring performance is passed through each of the annular spaces in the cylindrical partition tubes.

Abstract: A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of copper tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. The cold water source is coupled to a short length of convoluted flexible tubing with coupling flanges which couple the water through the flue mounted heat exchanger. Preheated water exits from the heat exchanger through flexible tubing having a safety pressure relief valve.

Abstract: A tube and shell heat exchanger is formed by a shell enclosing an internal sidewall which in turn receives an internally located flow controller outer and inner heat exchange cavities are formed between the outer shell and the internal shell and the internal shell and the flow controller, respectively. Helical convolutions of the conduit are provided in each of the heat exchange cavities for counter concurrent flow of fluid medium from one cavity to another. A bottom wall closes off the outer shell.

Abstract: An assembling heat exchanger of spiral sleeve consist of the outer casings, core tube device, flow guide plate and sealing means. The outer casing comprising the lower and upper outer casings has the front and rear enclosed plates fixed to its both ends to form a closed casing. The core tube device provided at the middle portion of the outer casing includes the core tube body, end enclosed plates and heat exchanging copper tubes. The flow guide plate is located between the inner wall of the outer casing and the outer wall of the core tube body with the sealing means provided between the upper and lower outer casings and secured into an integral casing by bolts and nuts. The exhausted hot water enters the heat exchanger from the inlet on the outer casing and exit the outlet while the clean tap water enters the heat exchanger from the opposite inlet provided on the core tube device.

Abstract: A pipeline for transmitting oil or other substance which forms a solid residue such as wax when the substance is cooled, as in a subsea oil pipeline. Pass a tube through the interior of the pipeline, e.g., at the wall of the pipeline. Transmit heated liquid or water through the tube for heating the material being passed through the pipeline to a temperature which avoids or eliminates the solid residue and for heating the pipeline.

Abstract: A self-contained portable unit for heating physiological fluids is disclosed. A heat exchanger is disposable to ensure sterility, and the hot exchanger is attached to a heating system by inserting it between opposed fluid connection elements. One of the fluid connection elements is movable to permit the heat exchanger to be installed and removed easily by inserting one end of the heat exchanger in one of the fluid connection units and moving the other fluid connection unit into contact with an opposite end of the heat exchanges. The heating fluid is heated by an electric heating element and is circulated by an electric pump.