Abstract: A cooling assembly is provided for an electromechanical device, such as an electromagnetic or generator, including a housing having a wall portion. A magnetic field member is disposed within the housing and is arranged adjacent to the wall portion. A shaft having windings is located within the magnetic field member with an electric current flowing through the windings, which coacts with the magnetic field member. The magnetic field member and the windings produces an undesirable level of heat. The present invention incorporates a helical cooling coil defining a fluid conduit arranged adjacent to the magnetic field member for removing heat from the electromechanical device.

Abstract: A heat exchange device, for allowing the exchange of heat between a first medium and a second medium, using a coaxial double tube. The coaxial double tube includes an outer tube, and an inner tube which extends through the outer tube. The inner tube has an inner conduit for allowing a first medium to travel therethrough, and an outer conduit is formed between the inner tube and outer tube for allowing a second medium to travel therethrough while remaining physically isolated from the first medium. The outer tube is made of plastic, and the inner tube is made of metal, which allows heat to be transferred between the first medium and second medium and allows the tube to be selectively bent into a coil to minimize space for the heat exchange device.

Abstract: The invention relates to an air conditioner with a refrigerant loop containing a compressor, an evaporator, an accumulator positioned on the low-pressure side between the evaporator and the compressor, and an internal heat exchanger with a high-pressure side heat transfer channel and a low-pressure side heat transfer channel. According to the invention, the internal heat exchanger has a multichannel tube wound into a radial spiral or a meander shape. In addition or alternatively, the internal heat exchanger contains a multichannel tube which is positioned in the air current path of a cool air current of a high-pressure side condenser/gas cooler. Utilization, for example as a CO2 air conditioner in motor vehicles.

Abstract: A system for stripping an optical fiber includes a source air, and means for generating very short bursts of air. A heater heats the bursts of air to a temperature sufficient to remove the outer coating from an optical fiber, while maintaining the air isolated from the heat source. The heater includes a heater core that includes a heat generating element such as a conductive filament, and a heat chamber enclosed within the heater core. A spiral-shaped air conduit surrounds the outer surface of the heater core, and communicates with the heat chamber. Upon injection of air into the conduit, heat is transferred to the air from the heat generating element while the air flows through the air conduit and into and out of the chamber. A single burst of heated air removes the outer coating of an optical fiber, within less than one second.

Abstract: An annular heat exchanger suitable for a Stirling engine is provided. The heat exchanger has helical fins, and an outer reinforcing sleeve about the fins. The sleeve improves the pressure resisting ability of a thin separating wall between a pressurized fluid and an outside working environment, resulting in a high-pressure heat exchanger with high heat transfer efficiency. In addition, the sleeve and helical fins together define fluid passages for the flow of heating fluid. The heat exchanger according to the invention has the ability to resist high pressures at high temperatures without distortion, has improved heat transfer capability, better reliability, and lower production cost than prior art heat exchangers.

Abstract: A heat exchanger for swimming pools, formed of generally cylindrical housing, through which flows a first medium while a second medium flows through a line designed as a spiral within the housing. The spiral shaped line is formed of a corrugated hose and possesses separate connection fittings for the second medium, namely the corrugated hose. The corrugated hose is connected by its end sections which extend in an axial direction to likewise axially extending sections of the separate connection fittings for the second medium.

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: Apparatus for and method of use for a heat exchanger in an HVAC system having a system refrigerant for heat transfer between a radiator and a heat exchanger, in heat transfer communication through the heat exchanger. Single or multiple heat exchange loops and flow controllers maintain system balance during operation of the system.

Abstract: A cylindrical heat exchanger composed of a cylindrical inner housing formed with smooth internal and external surfaces and a cylindrical outer housing shell formed at opposite ends thereof with a pair of cylindrical portions and at an intermediate portion thereof with a plurality of axially equally spaced annular portions partly reduced in diameter, wherein the outer housing shell is coupled with the inner housing such that the cylindrical portions and annular portions of the outer housing shell are engaged with the external surface of the inner housing to form a plurality of axially spaced annular flow passages communicated with each other through communication passages formed at each one side of the annular portions, and wherein a flow passage composed of the annular flow passages and communication passages is communicated at its one end with an inlet formed in one end portion of the outer housing shell and at its other end with an outlet formed in the other end portion of the outer housing shell.

Abstract: A tube and shell heat exchanger having a transversely oriented inlet port and a spirally coiled heat transfer tube contained within an arcuate chamber created by an internal baffle in which the water to be conditioned travels along a helical pathway in which the flow has minimized water depth and high turbulence. The tube and shell heat exchanger maximizes heat transfer capability in a relatively easy to assemble design to make feasible the use of a higher cost material for the tubing such as titanium in a wide range of applications.

Abstract: An improved evaporator for a refrigeration system to reduce the temperature of a medium therein in which a first tube composed of a first material having a first thermal conductivity is surrounded by a body of a second material disposed in intimate contact therewith, the second material having a different thermal conductivity than the thermal conductivity of the first material. An evaporator refrigerator inlet and outlet are disposed in the body and a refrigeration path intermediate the inlet and outlet includes a plurality of fins in the path to increase the surface area of the second material in the path. A refrigeration system using the improved evaporator and including a subcooler, is described and a method of manufacturing the evaporator is disclosed.

Abstract: A heat-exchanger tube has an inner tube wall centered on an axis, formed with an outwardly projecting helical ridge having a helical outer surface, and forming an outwardly open helical groove delimited by the ridge and an outer tube wall centered on an axis, formed with an inwardly projecting helical ridge of the same hand as the inner-tube ridge, having a helical inner surface, and forming an inwardly open helical groove delimited by the outer-tube ridge. The inner tube is coaxially received in the outer tube with the grooves together forming a helical passage having a plurality of turns and the surfaces radially confronting and spaced from each other to form an axial passage for fluid communication between adjacent turns of the helical passage. A fluid is fed to one end of the helical passage and withdrawn from an opposite end with flow of the fluid helically along the helical passage and axially through the axial passage.

Abstract: A system for warming a circulatory fluid is disclosed, which system comprising in a preferred embodiment a warming element consisting of a body defining a bore having irregular fluid flow surfaces and heating elements disposed about said body, a control means electrically coupled to said warming element and a power source.

Abstract: A device for simultaneous application of a plurality of adhesive spot s to a substrate, having a metering apparatus for conveying a predetermined volume of adhesive to a plurality of applicator nozzles for the application of respectively one adhesive spot to the substrate. A distribution apparatus distributes the volume of adhesive conveyed by the metering, device to the applicator nozzles. A warming medium is heated in a warning apparatus for heating the adhesive to a temperature desired for manipulation. The metering apparatus and the distribution apparatus are connected with each other by a conveying line containing an adhesive conduit. Feed lines with adhesive conduits lead from the distribution apparatus to the applicator nozzles, wherein a closed loop of the warming medium is formed, starting at the warming apparatus, and routed via the distribution apparatus and the feed lines to the applicator nozzles, and is returned via the feed lines and the distribution apparatus to the warming apparatus.

Abstract: In a method and evaporator device for evaporating a low temperature liquid medium, such as hydrogen for example, the hydrogen is first evaporated and at least partially superheated in a forward-flowing first channel, and is then directed to flow back in the opposite direction in a second return-flowing channel. The second channel is especially interposed between the first channel and a passage through which flows a heat-providing medium such as a hot exhaust gas. Thus, the superheated hydrogen flowing in the second channel serves as an intermediate layer for heat transfer from the heat-providing medium through the hydrogen in the second channel to the low temperature, initially liquid hydrogen in the first channel. The heat exchange surfaces in contact with the heat-providing medium are not directly adjacent the extremely cold surfaces in contact with the in-flowing low temperature liquid hydrogen, and the superheated hydrogen acts as a buffer between the hot side and the cold side of the evaporator.

Abstract: A pathogen reduction system for a sludge treatment process that employees multiple reactors operating in a batch mode to reduce pathogen levels in the sludge while providing a continuous flow of pathogen reduced sludge to a digester. In addition, the present invention entails an efficient heat exchanger for heating and cooling the sludge being treated in the above process. In particular, the heat exchanger is of the counterflow type and includes a helical coil confined in an annular chamber for transmitting one media and wherein the helical coil is spaced so as to form another helical flow channel that is defined by the annular chamber and the helical coil itself. Consequentially, one media is directed through the helical coil while another media is directed through the flow channel that is defined in part by the helical coil.

Abstract: A heat exchanger is disclosed having a first chamber, a second chamber positioned inside the first chamber, and a third chamber positioned inside the second chamber. The first, second, and third chambers are in coaxial alignment. A first portion of a first helical tube is positioned inside the second chamber and a second portion of the first helical tube is positioned inside the third chamber and a second helical tube is positioned inside the first chamber. The heat exchanger heats a cryogenic liquid to a gas phase using at least three different heat transfer fluids in one contained unit without mixing any of the fluids in the exchanger.

Abstract: A heat exchange device for harnessing heat from an exhaust vent is provided including a furnace having a main inlet for receiving cooled air suctioned from a living area, a heating mechanism for heating the cooled air suctioned from the living area, a main outlet for delivering air to the living area which is heated by the heating mechanism, and an exhaust vent coupled to the furnace for expelling air associated with the generation of heat by the heat mechanism with such expelled air not being fit for channeling to the living air via the outlet. Next provided is a housing which divides the exhaust vent into a lower portion and an upper portion. The housing has an auxiliary inlet in communication with the living area for receiving the cooled air therefrom and an auxiliary outlet in communication with the living area for expelling air thereto. Lastly, a heat transfer mechanism includes a pipe formed in the shape of a helix.

Abstract: In a heat exchanger in the shape of a pot, with a frontal connector for a burner or the like, a lateral water inlet in the base and a water outlet in the region of the frontal connector, water flows through both the base and the jacket of the pot during operation. The invention proposes the provision in the base of the pot of water conveying sections, especially in the form of sickle-shaped water guide channels and barriers to ensure a directional water flow, substantially covering the surface of the base of the pot, in order to ensure a uniform temperature distribution on the pot base without the formation of steam bubbles.

Abstract: The present invention relates to an insulating mechanism for a gas water heater designed to increase the efficiency thereof. The device comprises a blanket formed of a pair of arcuate, adjacent panel members having top and bottom edges with a pair of opposing side edges therebetween. Adjacent side edges of the panel members are hingedly joined with the opposing side edges being selectively attachable to form a cylindrical blanket that encases a water heater storage reservoir. A piping system is disposed within each panel member for circulating waste gas therethrough. An exhaust duct is disposed on the top surface of a water heater outer shell and is in communication with the interior thereof. A hinged baffle divides the duct into an upper and lower chamber both of which are in communication with the piping system.

Abstract: The present invention concerns a heating device for motor vehicles comprising a heat exchanger with primary and secondary circuits. The said exchanger is connected, through a system of ducts to the passenger compartment of the vehicle and/or to the front and/or the rear windows of the same. The said device is intended to heat the said passenger compartment and/or to de-ice the said front and/or rear windows. Under the invention, the said heat exchanger (3) is placed at the engine (M) exhaust of the said vehicle (1). The exchanger (3) primary circuit (12) is on the one hand, connected to the outlet of any cylinders (C) of the engine (M) so as to be crossed by the exhaust gases from the latter and, on the other hand, it is connected to the manifold (13) leading to the muffler.

Abstract: An improved refrigerated mixing chamber for the food and beverage industry and associated method of manufacture is provided. The chamber is manufactured from a pre-formed piece of stainless steel that has been cold pressed into shape so that it has no axial welds. The device further includes an outer sleeve that is shrink fitted around the chamber. The sleeve has an advancing helically groove formed on its inside surface. The combination of the helical groove and the outer surface of the chamber forms a helical passageway through which refrigerant flows. The method of manufacture causes the grooves in the outer sleeve to interfere with the outer surface of the chamber such that an advancing helical rib is formed around the chamber. This rib aids in strengthening the chamber.

Abstract: A fluid heat exchange apparatus is disclosed that can be used as an absorber in an absorption cooling system. The compact absorber design uses concentric thermally conductive cylinders to form alternating annular passages for a heat transfer fluid and a solution. The heat transfer fluid passages contain a generally helical coil. The generally helical coil distributes the heat transfer fluid in a generally helical path between the thermally conductive cylinders. The solution passages also contain a generally helical coil. However, the solution passage coils are grooved rods. The grooved rods allow solution to flow between the rods and the walls of the cylinders. The solution flows down the cool walls of the thermally conductive cylinders. Simultaneously, refrigerant vapor flows upward in a generally helical path within the solution passages and is absorbed into the solution droplets. Further, additional embodiments are disclosed that use a grooved rod to absorb a vapor into a solution.

Abstract: A fluid heat exchange apparatus is disclosed that can be used as an absorber in an absorption cooling system. The compact absorber design uses concentric thermally conductive cylinders to form alternating annular passages for a heat transfer fluid and a solution. The heat transfer fluid passages contain a generally helical coil. The generally helical coil distributes the heat transfer fluid in a generally helical path between the thermally conductive cylinders. The solution passages also contain a generally helical coil. However, the solution passage coils are grooved rods. The grooved rods allow solution to flow between the rods and the walls of the cylinders. The solution flows down the cool walls of the thermally conductive cylinders. Simultaneously, refrigerant vapor flows upward in a generally helical path within the solution passages and is absorbed into the solution droplets. Further, an absorption cooling system is disclosed that utilizes multiple helical absorbers.

Abstract: A processing vessel in which a temperature control element defining a helical flow passage, disposed on an outer surface of an inner barrel within the processing vessel. The barrel contains a processing liquid and a heating or cooling temperature control medium is caused to flow through the flow passage. The inner barrel and temperature control element are disposed in a vessel body to define a chamber between the temperature control element and an inner surface of the vessel body. The chamber defined between the vessel body and the temperature control element is a closed chamber. Preferably, a system for generally equalizing the pressures in the inner barrel and the closed chamber is provided. The temperature control element can be assembled in the vessel body after being manufactured outside the vessel body. Therefore, the processing vessel can be manufactured with improved efficiency and can be serviced by ordinary in-vessel maintenance operations.

Abstract: A sleeve assembly for reducing the thermal conduction heat load from the bellows penetration tube to the heliumvessel of a superconducting magnet assembly. The sleeve assembly is designed to force helium boil-off gas to flow in intimate contact with the bellows convolutions. The helium boil-off gas thereby intercepts or removes a portion of the heat that would normally be conducted from the bellows convolutions to the helium vessel. The sleeve assembly consists of a circular cylindrical rolled tube made of laminated thermosetting material. The outer diameter of the tube is wrapped with tape in a helical pattern. The diameter of the sleeve and the thickness of the tape wrapping are selected so that the outer circumferential surface of the helically wrapped tape abuts the inner diameter of the bellows. The sleeve is fabricated with a relatively small thickness to minimize thermal con-duction load.

Abstract: Multi-passage heat exchange element which includes an elongated central first fluid passage for passage of a first fluid of a heat exchanger, a plurality of substantially helically convoluted second fluid passages for a second fluid of a heat exchanger, the second fluid passages substantially helically surrounding at least a portion of the elongated central passage, and a plurality of substantially helically convoluted first fluid passages for passage of the first fluid of a heat exchanger, the first fluid passages substantially surrounding at least a portion of the second fluid passages.

Abstract: It is used to reheat a secondary fluid such as pool water or sea water. It comprises a body provided with an inlet for the secondary fluid to be reheated and an outlet for the reheated fluid, a sleeve inside the body, a coil in which the primary fluid circulates and which is housed inside the annular space between the body and the sleeve and outside of which the water to be reheated passes. The body (1) and the sleeve (8) are made of a plastic-based material, either reinforced or not, and the coil (10) is made of titanium.

Abstract: Multi-passage heat exchange element which includes an elongated central first fluid passage for passage of a first fluid of a heat exchanger, a plurality of substantially helically convoluted second fluid passages for a second fluid of a heat exchanger, the second fluid passages substantially helically surrounding at least a portion of the elongated central passage, and a plurality of substantially helically convoluted first fluid passages for passage of the first fluid of a heat exchanger, the first fluid passages substantially surrounding at least a portion of the second fluid passages.

Abstract: A flexible-resilient heat exchanger that is designed to be disposed inline of a cardioplegia tubing set for heating or cooling blood and/or cardioplegia solution. The heat exchanger comprises a flexible-resilient inner tube defining an inner flow path for blood and/or cardioplegia solution, for example, and a flexible-resilient outer tube surrounding the inner tube. The outer tube has fluid inlet and outlet ports so as to define an outer flow path between the inner and outer tubes for heat exchanging fluid, for example. The outer tube is sealingly connected to the inner tube adjacent opposite ends of the outer flow path, and the inner tube defining a barrier between the first and second fluids while permitting heat transfer between the first and second fluids.

Abstract: A vortex heat exchanger device for the heat transfer between fluids of different temperatures that flow through the device. The vortex heat exchanger comprises a plurality of tubes each of a different diametric and each disposed concentrically relative to one another to define a plurality of channels. Fluid is tangentially introduced into the channels through at least two inlets, and fluid is tangentially emitted from the channels through at least two outlets. The tangential arrangement of the inlets and the outlets allow the fluids to flow through the annular channels in a vortex pattern.

Abstract: A method for forming an in-line heater for heating water supplied to a hot water carpet cleaning extractor includes the formation of a spiral flange upon the exterior surface of an elongated cylindrical body having a bore therein to define a heat exchanger. The flanged heat exchanger is inserted into a cylindrical housing having an inner diameter smaller than the outer diameter of the spirally flanged heat exchanger by heating the housing to increase the inner diameter thereof sufficiently to allow the spirally flanged heat exchanger to be be received therein. Upon cooling, the housing shrinks into watertight engagement with the spiral flange to define a spiral water floe conduit between the ends of the in-line heater. The first and second ends of the heat exchanger are then welded to the housing. Quick disconnect fittings are threaded into the in-line heater to establish communication with the end of the spiral water conduit.

Abstract: A cryostat in which a venting conduit is connected to a reservoir of the cryostat but no venting of cryogen within the reservoir can occur while fluid is flowing under pressure within the heat exchanger of the cryostat.

Abstract: A heat exchanger has warm coolant or liquid, for example from the engine, flow through it to heat it up. Disposed on the fuel filter is an electrical heating element that can directly heat the filter space or fuel contained in the filter housing. The heating element can be activated and deactivated in a controlled manner, for example manually, only when needed. The heat exchanger is formed of a rubber hose with a helically wound tube coil surrounding it with a sleeve being provided which surrounds the tube coil. The sleeve is made of rubber and securely connected to the hose by vulcanization.

Abstract: The invention pertains to an installation comprising a reforming reactor (12) supplied with a vaporized and superheated methanol-water mixture, a device for heating the liquid methanol-water mixture by heat exchange (5) with the reformed gaseous mixture (56), a device for vaporizing and superheating the heated mixture by heat exchange (23) with a heat-carrying fluid (51), a device for effecting the reaction of the vaporized methanol-water mixture by heat exchange (28-29) also with the heat-carrying fluid (31-32), a separator (75) for separating the water from the reformed mixture by cooling and partial condensation (61-63-64), and a device for producing pure hydrogen which also produces residual combustibles, and a device (15) for heating the heat-carrying fluid (31-32) by combustion (15), in particular of the residual combustibles.

Abstract: A heat transfer device is provided which has an improved energy efficiency, utilizes significantly less space and costs less than conventional condensers in refrigeration units. The heat transfer device comprises a plurality of coil units disposed in a serpentine configuration and which are juxtapositioned to decrease space requirements and increase heat transfer. The coil units are constructed by fist attaching a lateral fin to a tube. The tube is then bent to form a continuous helical structure and this helical structure is then bent to form a plurality of parallel interconnected individual units disposed in a serpentine configuration. Multiple rows of interconnected parallel units are arranged to interfit so that the condenser occupies a minimum amount of space.

Abstract: An apparatus for making a frozen confection product from a liquid food substance comprises a gas port for selectively injecting gas from a pressurized source into the liquid food substance at an injection point to form a mixture, a freeze tube having an inlet end and an outlet end and having a substantially cylindrical wall for containing the mixture therein, a cooling circuit for cooling an external surface of the cylindrical wall, and a whipping auger disposed within the freeze tube for emulsifying the liquid food substance portion of the mixture with the gas portion thereof, the whipping auger propelling a first portion of the mixture in a helical pattern from the inlet end of the freeze tube toward the outlet end and for simultaneously propelling a second portion of the mixture in a direction from the outlet end toward the inlet end of the freeze tube.

Abstract: A quick disconnect heat exchanger is disclosed wherein male and corresponding female members are adapted to be slidably interconnected. Each of the respective male and female members includes a discrete fluid flow so that fluids are not mixed during heat exchange and the coupler may be disconnected without fluid loss or mixing.

Abstract: A steam condensation device is provided in a dryer or combination washer/dryer for condensing hot water vapor carried by hot air used to dry laundry in the dryer or combination washer/dryer. The steam condensation device includes a vertically extending tubular casing, at least one condenser conduit extending vertically within and spaced from the casing so as to define an annular space therebetween, and a spiral wall disposed between respective internal and external surfaces of the at least one condenser conduit and the casing. The spiral wall extends spirally toward the lower end of the at least one condenser conduit so as to define a spiral conveying path alongside the external surface of the at least one condenser conduit. The condensation device is arranged so that hot air circulating through the interior of the rotating basket containing laundry in the machine passes through the interior of the at least one condensor conduit.

Abstract: A cross-flow heat exchanger comprising according to a preferred embodiment a shell formed of two concentric cylinders providing an annular space. A number of tubes and baffles are arranged in the annular space such that one fluid flows through the tubes in a helical fashion in the annular space and the second heat exchange fluid flows in a counter helical path in such annular space across the tubes, constrained by the baffles in such annular space. In another embodiment cross-flow is also achieved using spirally shaped tubes and spirally shaped baffles.

Abstract: A helical jet impingement evaporator including a laminated evaporator core comprising a plurality of orifice plates (1) each including a plurality of jet impingement orifices (5) for enabling a passage of a first fluid therethrough on a single-phase side of the evaporator. A plurality of spacer plates (2) are interposed between adjacent orifice plates (1) and the orifice plates (1) and spacer plates (2) are stacked with adjacent orifice plates (1) and spacer plates (2) being offset with respect to each other in a circumferential direction. The orifice plate (1) include circumferentially and radially spaced elongate slots (7, 9, 11) in registry with elongated slots (8, 10, 14) in the spacer plates (2) so as to define separate helical two-phase evaporating flow paths for a second fluid on a two-phase side of the evaporator.

Abstract: A heat exchanger for fluids is disclosed having a support assembly for the coil bundle which comprises two vertically spaced-apart support members between which the coil bundle of the exchanger is positioned. The bundle comprises a plurality of vertically spaced tubes each having a number of convolutions which slope upwardly and proceed outwardly to form the bundle. A bridge member having spaced-apart scalloped portions is provided which separate the convolutions of each tube to permit air and water to circulate therebetween. The support members have means for varying the slope of the bridge members depending on the nature of the fluid entering the exchanger.

Abstract: An auger type ice flaking machine has an evaporator section defined in part by a vertically oriented flaker barrel with closed upper and lower ends, and a knurled longitudinally intermediate exterior side surface positioned within an annular hollow jacket structure externally and coaxially mounted on the barrel and having an outlet opening positioned adjacent its upper end and communicating with the accumulator portion of an associated refrigeration circuit. Spirally wrapped tightly around the knurled surface is a coiled length of refrigerant tubing having an open lower end, and an upper end connected to the outlet of the expansion valve portion of the refrigeration circuit, adjacent coils of the tubing being longitudinally spaced apart. During operation of the machine, refrigerant is flowed downwardly through the tubing, into the jacket interior, and then upwardly through the jacket and outwardly through its outlet opening.

Abstract: A device for tempering and homogenizing viscous masses, particularly putty, and incorporating a combined heat exchanger and homogenizer (10), having a tubular part (12) through which the putty under pressure and tempering is caused to pass. In said tubular part (12) is provided a guiding device (16) designed compulsory to give the putty a plurality of direction changes relative to the tubular part (12). The guiding device (16) incorporates at least a first helical heat exchanger tube (17) arranged around a centrally disposed, second heat exchanger tube (18).

Abstract: A heating device for pre-heating liquid fuel, especially diesel fuel and for heating devices of a low heating performance which are independent from a motor having a heating performance which is suitable for mounting into vehicles, which are driven by the liquid fuel. The pre-heating is effected by a transmission of heat of the exhaust gas to the fuel of the heating device, the fuel being lead through a continuous tubular wrapping in one layer or through a hollow cylinder formed or positioned around the exhaust pipe. This wrapping or hollow cylinder is part of the fuel main from the fuel tank to the fuel supply pump of the heating device. A pre-heating of the content of the tank is effected by the return of the pre-heated, but not burnt fuel through a fuel return main back into the tank. A heat transmitting jacket is advantageously disposed between the wrapping, or a hollow cylinder and the exhaust gas pipe.

Abstract: A compact and efficient heat exchanger is defined by three coaxial tubes, the intermediate tube being spirally fluted and in intimate contact with inner and outer tubes. The resulting three walled tubular structure defines a spiral vent passage and double wall separation between inner and outer flow paths. The three walled structure may be formed into an evaporator coil for use in a water cooler.

Abstract: An apparatus 10 is provided for supplying a high-velocity flow of temperature regulated air 5 to the calender roll 90 of a paper making machine. Ambient air 1 is received into the plenum chamber 20 and distributed therefrom through a longitudinally elongated conduit means 30 which has an inlet 32 opening directly into the plenum chamber 20 and an outlet opening 36 along the other end thereof and defining therebetween a flow passageway 34. The outlet opening 36 is adapted to direct the air flow passing through the flow passageway 34 along the calender roll 90 in counter direction to the rotation of the calender roll 90. A series of spiral wound heating element coils 40 are disposed within the conduit means 30 at longitudinally spaced intervals along the length thereof to heat the air to a desired temperature by selectively powering the heating element coils 40.

Abstract: In combination with a diesel engine, an engine air intake conduit leading preferably to a turbocharger, a source of fuel, and a circuitous fuel path supplying fuel to the engine from the source and returning uncombusted fuel from the engine to the source, is a fuel cooler. The fuel cooler is mounted within the engine air intake conduit upstream of the turbocharger, if present, in a manner allowing intake air to flow through a central passageway of the cooler to the turbocharger. The fuel cooler is further engaged within the circuitous fuel path in a manner allowing heated fuel to travel through a peripheral passageway formed in the fuel cooler. The peripheral passageway is contiguous to the central passageway whereby heat from the heated fuel is transferred to the intake air, thus cooling the fuel. The fuel cooler is used preferably in cooling uncombusted diesel fuel being returned toward the storage tanks of a vehicle from the engine.

Abstract: A thermal control system adapted for test in a 1G gravity environment and for operation as a microgravity environment includes a capillary pumped loop with a wicked evaporator which produces a coolant vapor head of about 1/2 PSI upon absorbing heat from a heat source. A heat pipe includes a cylindrical portion adapted for absorbing heat, and also includes a radiator panel which rejects absorbed heat. A heat exchanger coupled to receive coolant vapor from the wicked evaporator includes a manifold which directs the vapor to a plurality of parallel fluid channels helically wound about and thermally coupled with the heat absorbing portion of the heat pipe. A liquid manifold is coupled to the liquid side of the fluid channels for receiving cooled liquid, which is returned to the wicked evaporator.

Abstract: A heat exchanger and heater of a tube type is provided for heating a liquid n a coiled type housing having an inlet and an outlet for liquid of various types. Hot materials in a gas flow are introduced into the system and a liquid is vaporized to heat the heat exchanger system. In a second embodiment of the shell type of heat exchanger and heater is used in the heating of the input liquid. The third embodiment of the heat exchanger and heater system utilizes a frusto-conical shell with a heat coil centrally located in the shell, while a fourth embodiment of the heat exchanger and heater utilizes a cylindrical coil for the liquid to be heated and a temperature sensor for sensing the temperature in the system at end point.