Abstract: A heat exchanger comprising first and second type of ducts extending mutually parallel and at least partially mutually adjacent. The duct cross-sections are connected in a regular pattern, such that each separating wall is bounded on at least one side by a first type duct and on the other by a second type duct.

Abstract: A flexible, integral polymer resistance heated conduit is provided that is particularly suitable for use with physiological fluids. The conduit is highly effective in uniformly heating a fluid and in maintaining the fluid at a uniform, predetermined temperature. The conduit is inexpensive and easy to manufacture, and is at least partially transparent or translucent, thereby allowing easy viewing of its contents.

Abstract: Heat exchangers constructed of a plurality of composite ribbed sheets plates disposed and in a substantial parallel plate stacked relationship are disclosed. The sheets or plates can be spaced from each other by composite ribs or bars formed integral with or bonded to and between adjacent plates. The composite plates function as the fins of a conventional plate fin heat exchanger while the ribs form the passageways to separate adjacent fluids. The fins are specially constructed to maximize heat transfer between adjacent passageways formed by the ribs and the fluids flowing in these passageways.

Abstract: A heat exchanger block includes a monoblock composed of a ceramic material having two separate conduit systems for media flowing therethrough. At least one of the conduit systems includes a conduit having a cross-sectional profile of an essentially oblong slot and having a plurality of walls. Each wall has a cross-sectional profile of overlapping circular arcs.

Abstract: A boiler/condenser assembly for a high efficiency purification system including a plate-in-frame type heat exchanger wherein vertically extending common plate members are provided with corrugated faces having herringbone configurations constructed and arranged to provide a plurality of contact points where the condensing surfaces of adjacent common plate members defining a condensing chamber come into near or direct contact which serve as accumulation points for the liquid forming on the condensing surfaces of both common plate members. The accumulated liquid is caused to flow off the condensing surfaces in a plurality of diagonal liquid flow paths.

Abstract: A heat exchanger for enhancing thermal efficiency between two fluids and lengthening a fluid passage so as to increase contact surfaces between heat exchanger and fluids and permitting the heat exchanger to be compact as a whole. The heat exchanger includes a combination of first and second heat exchanger units respectively comprising larger and smaller diameter discs on which small chambers, which are open at fronts thereof and communicate with one another, are provided, so as to permit the fluids to perform striking, dispersing and meandering operations.

Abstract: A method and apparatus for the transfer of heat with the aid of rotating surfaces. The fluid with which an exchange or transfer is to be made is introduced in parallel in one or more gaps or channels defined between the rotating surfaces. Rotation of the surfaces causes the major part of the fluid flow to pass through a rotating, flow mechanical boundary layer adjacent the rotating transfer surface in lamellar or turbulent flow.

Abstract: In a heat exchanger with confronting partition walls (50) separating two fluids, extended surface for heat transfer enhancement is provided by extended surface packets (42), each comprising a multiplicity of fins (44), made integral with a common base plate (56) and a common top plate (62); packets (42) being attached to adjacent walls (50) through junction layers (68) formed by a bonding process. The partition walls (50) are typically constituted by the flat walls of oblong cross section tubes (34). In a preferred embodiment, for low temperature applications such as an air-cooled steam condenser for electric power generation plants, tubes (34) are made of steel, extended surface packets (42) are made of aluminum by extrusion, and bonding is by an organic structural adhesive.

Abstract: An exchanger for oxygenating blood includes a casing having walls and a cavity, sheet material with first and second ends covering distal edges of the walls, and a cover extending over the cavity to sandwich the first and second ends of the sheet material between the cover and the edges of the walls. The cover is melted into the sheet material and the distal edges of the walls. In another embodiment, a blood oxygenator includes a first compartment having a closed casing divided by a folded sheet of membrane material forming a first blood chamber and a first gas chamber. The casing has first and second manifolds in fluid communication with the first blood chamber. A second compartment is interconnected with the first compartment and has a closed casing divided by a folded sheet of membrane material forming a second blood chamber and a second gas chamber. The casing has third and fourth spaced apart manifolds in fluid communication with the second blood chamber.

Abstract: A plate heat exchanger having a stack of plates with spaces between the plates defining passages for hot and cold fluids. The ends of the plates define inlet and outlet openings for the fluid passages. The openings are enlarged by bending the end of one of the two plates for each flow path away from the corresponding end of the other of these plates and welding it to an adjacent plate. Preferably the ends of the plates are triangular, or V-shaped, to lengthen the openings along each edge of the V.

Abstract: A method for manufacturing an exchanger includes the steps of folding sheet material in a series of pleats, placing the folded sheet material in a casing having an opening defined by walls with distal edges, covering the distal edges with end portions of the sheet material, and affixing a cover to the casing by simultaneously melting a portion of the cover and the sheet covered distal edges of the walls, and contacting the cover with the sheet material covering the distal edges of the walls. The method may also include melting a portion of the cover and/or the casing and placing the melted cover on the casing so that the melted portion contacts pleats of the sheet material, and permitting the melted material to cool and solidify and form a bond with the sheet material.

Abstract: An air exchanger for continuously exchanging indoor air with outdoor air to provide a constant supply of fresh air into a structure which includes a heat exchanger having a continuous structure which defines adjacent first and second sets of channels which open toward opposite sides of the air exchanger. The air exchanger draws outdoor air through the first set of channels in a first direction and indoor air through the second set of channels in a second, counter-direction. Heat is transferred between the indoor and outdoor air streams such that when the outdoor air enters the room, its temperature approaches the indoor temperature and indoor heating or cooling effects are minimized.

Abstract: A wound plate heat exchanger includes a series of air cooling passages defined between the convolutions of its windings such that, when rotated about a longitudinal axis through the center of the windings, cooling air is drawn through the cooling air passages.

Abstract: An alternating-flow heat exchanger and method of forming is disclosed, in which a substrate is provided having open-ended, straight passageways therethrough, and at least one end cap for diverting flow in said passageways into primary and secondary flow paths. The ceramic substrate is coated with a desirable coating. The end cap is then applied to the substrate to direct flow from the passages in first and second flow paths.

Abstract: A heat exchanger having on a first and a second side inlets and outlets, respectively, for a preferably gaseous heat exchanging medium, and having a heat exchanging component made of a high thermal conductive material, such as metal, and comprised of a package of lamellae, in which the heat exchanging material has a structure permeable to the heat exchanging medium, and in which channels for the medium passing from the inlet side to the outlet side are formed, such that medium flowing in via the inlet channels can flow to the adjacent outlet channels at an angle to the direction of entry via the heat exchanging material.

Abstract: A multi-chip module having a conformal heat transfer interface to adapt to variations in the height and angle of integrated circuit chips and to achieve a thermal energy path between each chip and a heat sink. The conformal heat transfer interface includes a deformable metallic membrane and a liquid under pressure. The liquid has a high thermal conductivity and provides a pressure for deforming the metallic membrane to compensate for non-coplanarity of the chips. The module integrates the structural support, RF shielding, contamination-protection elements, and the heat-dissipating mechanism that are desired in the design of multi-chip modules. Double-sided cooling of the module significantly improves the thermal characteristics of a module, even in the absence of the conformal heat transfer interface.

Abstract: A double cross counterflow heat exchanger of the continuous plate type is formed of a continuous sheet of heat conductive material folded upon itself on fold regions in opposite directions alternately to define a plurality of substantially parallel, mutually spaced sheet portion, substantially each sheet portion thereby being located between first and second adjacent sheet portions with the fold regions being located at the lengthwise ends of each sheet. Each sheet portion has a pair of edge sections perpendicular to the fold which joins two sheets, the portions of which edge sections, of the two sheets, most distant from the joining fold are sealed together to define a fluid flow channel, each of the channels having first and second fluid transmitting openings located at the sides of each channel, and a third fluid transmitting opening located at the end of each channel opposed to the fold sealing the opposite end of each channel.

Abstract: A compact, high integrity heat exchanger element comprises a core layer through which the heat exchange fluid passes between its inlet and its outlet. The core layer includes a main heat exchange region containing heat exchange surfaces acting as fins. It also has distributor/ collector regions containing flow intercepting features for distributing or collecting the fluid flow over the width of the element. The heat exchange element consists of a minimum of two unitary sheets of metal joined by diffusion bonding in selected places. During manufacture, at least one of the unitary sheets has been superplastically deformed, in at least some of the places where it has not been diffusion bonded, so as to form the core layer complete with all its features in one operation.

Abstract: In a heat exchange system such as an absorption refrigerator, a heat exchange element is disposed in at least one of a heat exchanger, a condenser, an evaporator, an absorber and a low-temperature regenerator. The heat exchange element has a bellows-fin formed into a wave-like shape by consecutively bending a thin plate, and sealing plate sealingly attached onto ends of the bellows-fin, for defining adjacent two chambers alternately in the heat exchanger or the like. The heating fluid and the fluid to be heated are heat-exchanged to each other through the thin plate of the bellows-fin defining respective chambers, so that contact area is increased to thereby extremely improve the heat exchange efficiency. Further, the heat exchange element can be manufactured with ease, to thereby decrease the production cost.

Abstract: A heat exchanger with enhanced spacing and sealing characteristics is formed by folding a continuous strip of material having a rectangular pattern stamped thereon. The pattern includes rectangles which constitute base walls and side walls with multiple tabs on the periphery of the strip which comprise wall tabs and bonding tabs respectively. The continuous strip when folded forms a series of alternatingly stacked air passageways, created by the union of each of the base walls, side walls and wall tabs on the periphery of the strip. The bonding tabs may form a seal with a base wall internally, or the bonding tabs may form a seal with another matching bonding tab externally of the created air passageways. The heat exchanger formed upon folding has a number of alternating air passageways which are of a sufficient width for effective transfer of thermal energy.

Abstract: A heat exchanger for counterflow and parallel flow is comprised of a plurality of stacks of form-stamped individual plates that are combined to pairs and the pairs are assembled atop one another to form the stacks. A first flow channel for a first medium is formed between the plates of each pair, and a second flow channel for the second medium is formed between adjacent pairs. The stacks are arranged directly adjacent to one another to form a stack assembly. Each first and second flow channel has an inlet and an outlet arranged diagonally opposite one another. The inlets and outlets of the first flow channels are arranged atop one another as are the inlets and the outlets of the second flow channels. The inlets and the outlets of the first flow channels are staggered relative to the inlets and outlets of the second flow channels by half a height of the pairs.

Abstract: A heat exchanger unit (10) between flue gas and water in a boiler comprises internally first paths for the water and second paths for the flue gas. Walls (23) separating the first and second paths comprise fins (22) projecting therefrom in the second paths to be licked by the flue gas and perform heat transfer between the flue gas and the walls of the water paths.Each fin (22) has substantially flat lateral faces (24,25) mutually inclined to taper downward and an upper end (27) and lower end (26) rounded to radius together said lateral faces (24,25).

Abstract: A double loop heat storage space heating furnace has a housing with an upper heat storage section containing an electrically heated heat storage brick portion and a lower section containing an air-to-air heat exchanger having first and second air flow passages. The furnace has two separate flow courses. The first flow course uses a room air fan to circulate room air through the first passages of the heat exchanger. The second flow course has a recirculating fan in the lower housing section for recirculating air in a continuous closed loop through the heat storage brick portion to be heated and the second flow passages of the heat exchanger so that heat is delivered from the heated recirculated air and the room air in the heat exchanger. The upper housing section includes a cooling air space surrounding the heat storage brick portion through which the room air fan circulates a portion of the room air to maintain the furnace housing at a temperature similar to that of the room air.

Abstract: A heat exchanger including a plurality of fluid pathways (13, 15, 16, 17, ) in which at least some are defined between surfaces of unperforated primary plates (10). Between the primary plates (10) are at least two secondary perforated plates (12) extending along the fluid pathway (13, 15, 16, 17, 18) with perforations (11) in adjacent plates (12) being staggered. Adjacent secondary (12) and primary (10) sheets are in contact such that conducting pathways (19) are formed extending between the two primary surfaces while areas of secondary plates (12) not in contact with other secondary plates (12) constitute secondary surfaces (22).

Abstract: A plate type heat exchanger, for effecting heat transfer between a first fluid and a second fluid, comprises a casing having an inlet and an outlet for the second fluid. A stack of plate elements is arranged within the housing, the plate elements being arranged in opposed pairs to define flow passages for the first fluid and flow passages for the second fluid, with means gving communication between the successive first fluid passages. In addition, at least one cross wall is disposed parallel to the plates within the casing, so as to divide the casing into at least two chambers, with the second fluid inlet being open into one chamber and second fluid outlet into another chamber, the cross wall having an opening for enabling the second fluid to flow from one chamber to the other.

Abstract: A condenser (44) of a heated fluid which is condensed within a core of the condenser in response to heat exchange between the heated fluid and a coolant fluid flowing through the core in accordance with the invention includes a plurality of heat conductive laminates (70 and 72) having at least one first channel (12) through which the fluid being condensed flows and at least one second channel (14) through which the coolant flows. The cross-sectional area of at least one of the at least one first channel in the condenser decreases in a direction of fluid flow through the condenser producing increased velocity of the heated fluid flowing in the direction of fluid flow causing a shear force between a vapor phase of the heated fluid and liquid phase condensed on a perimeter of at least one first channel which causes the fluid phase to flow through the at least one channel.

Abstract: A turbine engine is provided with a primary surface, counterflow heat exchanger for preheating the compressed air from the compressor prior to its entry into the combustor. The recuperator includes three concentric cylindrical shells which completely encircle the hottest components of the engine. The outermost shell includes a plurality of inlet openings for receiving air from the compressor, and a plurality of outlet openings for discharging the air into the combustor. The innermost shell includes a plurality of inlet openings for receiving gases from the turbine and a plurality of outlet openings communicating with an exhaust duct. The central shell is a corrugated tube which divides the space between the inner and outer shells into a plurality of concentric annular flow chambers, and allows heat transfer between adjacent chambers. Annular turbulators may be inserted in the chambers.

Abstract: A heat exchanger comprises concentric annular arrays of parallel feeder tubes and receiver tubes which are interconnected by generally circumferentially extending heat exchanger tubes. Each heat exchanger tube interconnects one feeder tube with a corresponding receiver tube which is angularly spaced apart therefrom. In operation a first fluid flows over the heat exchanger tubes while a second fluid flows through the heat exchanger tubes. The heat exchanger tubes are so arranged that the fluid flowing through them has a component which is opposite to that of the fluid flowing over them.

Abstract: The invention concerns a method of constructing a heat exchanger as well as a heat exchanger constructed in accordance with said method. The method comprises piling of essentially similar corrugated thermal transmission plates to cover each other and connecting the spaces between the plates from their edges to inlet and outlet conduits for the mediums participating in thermal transmission so that through every second space between the plates is passed a flow of heat giving medium and through every second space between the plates a flow of heat receiving medium. Essential to the present invention is that the pressure losses of flows and the thermal transmission coefficient of the exchanger are established by piling the thermal transmission plates one over another so that the grooves in different plates are placed at a selected angle with each other.

Abstract: A thermal energy storage system comprising a germanium phase change material and a graphite container.

Abstract: A heat exchanger core is formed by a plurality of stacked plates which are rectangular so as to define two fluid paths at right angles passing between alternate ones of the plates. The core is constructed by defining walls extending at right angles from the side edges of one of the plates and an inturned flange at the extremity of each wall. The inturned flange cooperates with a slot defined by a pair of folded portions of the next adjacent sheet so that the core is assembled by sliding two opposed slots along the cooperating flanges of the next adjacent sheet. A corner member has projections from the edges of a pair of right angle strips which projections extend into the core alternately into one fluid path and the next adjacent fluid path. Side support members similarly include a flat strip and projections into the fluid paths of the core.

Abstract: Circular heat exchangers have been used to increase the efficiency of engines by absorbing heat from the exhaust gases and transferring a portion of the exhaust heat to the intake air. The present heat exchanger is built-up from a plurality of preformed involute curved cells stacked in a circular array to provide flow passages and for the donor fluid and the recipient fluid respectively. The stacked cells are welded along a portion of their edges to secure them in the stacked circular array. Each of the cells have a plurality of corners with the core presenting corresponding corners after the cells are welded together. In order to reinforce the core against thermal stresses and forces generated by pressures of the fluids, circumferential welds are provided at each of the corners.

Abstract: A stacked-plate type heat exchanger is provided in which each of the plates are provided with holes or openings to facilitate the flow of hot and cold fluids therethrough. The plates are separated from one another by spacers of a predetermined thickness. A pair of fluid passages are defined with respect to the spacers as passing through the plates due to the holes or openings provided therethrough. A first distance between any two of the holes in one plate is a constant value and a second distance between any two of the holes in a second plate is a constant value. Each distance between any one of the holes in the first plate and each of the holes in the second plate which is closest thereto is also a constant value. This arrangement increases the efficiency of heat exchange and decreases the loss of pressure.

Abstract: A package gas to gas heat exchanger is constructed by joining together a plurality of individual folded plate heat exchanger modules (16) in side by side and optionally end to end relation, without the need for an external housing surrounding the modules. A plurality of baffle plates (38), are prefabricated as part of each module, and joined to each other as the modules are joined, thereby defining a plurality of alternating chambers (46) for the entry or exit of different gases on either side of each folded plate (18). A closure arrangement and method for the longitudinal ends of the folded plates includes closure bars (94, 96) in interference engagement with the folds of the plate (18), and a separator plate (50) which holds the closure bars together and maintains the sealing relationship with the folded plate (18).

Abstract: A heat exchanger for exchanging heat between at least a first fluid and a second fluid, with the heat exchanger including an intake and outlet manifold (10, 11, 12, 13) for a first fluid, at least one fluid impingement plate and finned heat exchanger plate (14) for the second fluid, and an end plate manifold, with the plates being stacked so as to form a laminated heat exchanger core. At least one or more spacer plates (15) may be interposed between the respective plates of the heat exchanger core and/or the inlet and outlet manifold (10, 11, 12, 13) and end manifold (18). The first fluid is fed into the inlet and outlet manifold (10, 11, 12, 13) and flows in a first direction through the impingement and finned heat exchanger plates (14) and is redirected by the end manifold (18) toward the inlet and outlet manifold (10, 11, 12, 13).

Abstract: A ventilating heat recovery system is used for exchanging heat between fresh air introduced to a building and stale air exhausted from the building. The system is designed to provide a long, counterflow heat exchange path. The system includes a stack of rectangular plates coupled to arcuate duct sections to provide to interleaved sinuous air paths in heat exchange relation with one another.

Abstract: A pressure sealed, laminated fluid-to-fluid heat exchanger is disclosed herein. The heat exchanger includes a laminated stack of alternating orifice and spacer plates with the orientation of the spacer plates relative to the orifice plates defining first and second fluid paths. A low pressure fluid conduit is provided for connecting a low pressure fluid supply to one of the fluid paths. A high pressure shell houses the stack and includes inlet and outlet ports for a high pressure fluid. The high pressure fluid enters the shells and traverses the other fluid path and also places the stack under compression to aid the bonds between the spacer plates and the orifice plates.

Abstract: In a heat exchanger module of fired ceramic material produced from a stack of punched and laminated green ceramic cards, the stack comprises at least two cards. The cards have first cut-outs (1) which, in stacked cards, form tubular channels (12) and second cut-outs (2, 4, 7, 8) which are positioned around the first cut-outs (1) and which, in stacked cards, partially overlap with the second cut-outs (2, 4, 7) of adjacent cards. Channels (13) which lie in the plane of the cards and surround the tubular channels (12) are thus formed.

Abstract: A heat exchanger for the exchange of heat between two media (Ma, Mb), each of which flows through a respective one of two chambers (A, B) mutually separated by a medium-impervious partition wall (5) made of thermal conductive material. The interior of each of the flow chambers, or at least of one flow chamber, is divided into a large number of medium-flow passages, which are connected in parallel with respect to the flow of medium passing therethrough. The flow passages (13, and 17) have a substantially rectangular cross-section having a flow area which is so adapted in respect of the medium flowing therethrough that the flow in the passages is substantially laminar throughout the whole length of the passages, without a central turbulent zone. The passage walls defining the flow passages comprise a highly thermal-conductive material and are formed integrally with, or in good heat-conducting contact with the partition wall (5) located between the two flow chambers (A, B).

Abstract: A crosscurrent heat exchanger body made up of a stack of joined, parallel flow web plates (1), and a hollow chamber (5) for flow across them between each two successive web plates, with the cover layers (2,2') of successive web plates being sloped toward one another at their ends over the hollow chamber (5) enclosed between them, and being joined tightly to one another over the entire width, is disclosed.

Abstract: A heat exchange element having a heat receiving side and a heat dissipating side and having a serpentine member defining a first plurality of parallel elongate grooves, having elongate openings all in the heat receiving side, and a second plurality of parallel elongate grooves, having elongate openings all in the heat dissipating side, the grooves of the first plurality being interdigitated with the grooves of the second plurality, and closures which close all of the open ends of one of the pluralities of grooves. An enclosure for an electronic assembly having a rack in which electronic assemblies may be mounted in a vertical orientation, the rack being mounted in a cavity defined by side walls, a rear wall, a front wall, a top and a base which together separate the cavity from the environment surrounding the enclosure. At least one of the walls having one of the heat exchange elements sandwiched between an outer panel and an inner panel.

Abstract: Gas/liquid heat exchanger with condensation.It is presented in the form of blocks juxtaposed (1) within an enclosure (2) and in which two series of channels (3,4) are pierced, these blocks (1) being disposed within an enclosure (2), the space between the enclosure (2) and the central column which the blocks form being separated into two chambers (6,7), connected respectively to the gaseous phase supply circuit (10) and the other to the circuit (14) for the evacuation of the condensates formed.

Abstract: A heat exchanger comprising a stack of metal cloth or wire screens partitioned by sealant material into different regions through which separate fluids flow to exchange heat by way of conduction through the metal wires.

Abstract: A heat exchange element having a heat receiving side and a heat dissipating side and having a serpentine member defining a first plurality of parallel elongate grooves, having elongate openings all in the heat receiving side, and a second plurality of parallel elongate grooves, having elongate openings all in the heat dissipating side, the grooves of the first plurality being interdigitated with the grooves of the second plurality, and closures which close all of the open ends of one of the pluralities of grooves. An enclosure for an electronic assembly having a rack in which electronic assemblies may be mounted in a vertical orientation, the rack being mounted in a cavity defined by side walls, a rear wall, a front wall, a top and a base which together separate the cavity from the environment surrounding the enclosure. At least one of the walls having one of the heat exchange elements sandwiched between an outer panel and an inner panel.

Abstract: The invention relates to a heat exchanger, particularly a counter-flow heat exchanger for use in a Joule-Thomson refrigerator. The heat exchanger includes a casing having at least one pipe disposed therein which defines a first flow passage for conducting a first fluid. A second flow passage is provided between the pipe and the casing for conducting a second fluid in heat transfer relationship with the first fluid. A plurality of wire nets are provided along each of the two flow passages to facilitate heat transfer between the two respective fluids.

Abstract: The invention relates to a fuel preheater, especially for use in diesel engines of motor vehicles, in which the fuel, as a first fluid medium, is heated by absorbing heat from a second fluid medium of higher temperature, and in which the two media are carried through the preheater in separate passages. The preheater has a core which consists substantially of a set of walls of meandering cross section which forms two groups of parallel passages opening alternately on one longitudinal side and the other longitudinal side and running between the individual walls of the set the passages of one group being all open on the same side. The core is disposed between two covers covering the open longitudinal sides of the passages.

Abstract: An improved heat exchanger is shown for indirect heat exchange between two fluid media. The heat exchanger has thin metallic walls and a multitude of convoluted or tortuous shaped internal flow passages to increase the effective contact time during which heat is transferred between the media. The heat exchanger is particularly suitable for heat exchange between fluids having low differential temperatures or specific heats, due to the thin wall structure, the elongated tortuous internal flow path created by the core structure and the absence of welds, soldering or other thick areas which tend to inhibit heat transfer due to their relatively greater mass. The heat exchanger is produced by a novel technique. A support matrix is assembled from a plurality of low melting point forms, each of which has angled internal passages. The passages of each form are positioned in register with the passages of adjacent forms.

Abstract: The invention relates to a heat exchanger for two fluid media, especially liquids, having a housing which can be closed with a cover and which has a core for separately carrying the two media under heat exchange, at least the core being able to be produced by pressure casting. The core (3) is formed essentially of a train of walls in a meandering configuration which form the passages for the two media in the form of tall, narrow chambers, while the one medium and the other flow alternately through adjacent chambers. The chambers are divided into partial chambers disposed in two planes through which the fluid flows successively, by a common partition wall (34) which divides all the chambers vertically and is integral with the train of walls.

Abstract: A heat transfer element for cross flow heat exchanger consists of ceramic corrugated and planar plates. A plurality of the heat transfer elements are stacked up in such a manner that the direction of corrugation in adjacent elements intersects at right angles to form a heat transfer block for cross flow heat exchanger. Concave portions of corrugation, which confront soot-blowing flow for removing soot deposited onto the heat transfer surfaces of heat transfer block, are filled with ceramic solids. Also concave portions of corrugation corresponding to the corners, which abut the packings attached when the heat transfer block is installed on a casing, are filled with ceramic solids.

Abstract: A ceramic heat exchanger element comprises a ceramic honeycomb body, fluid passages formed in the ceramic honeycomb body and ceramic tubes extending through and fixed to the ceramic honeycomb body so as to intersect the fluid passages. The ceramic of the honeycomb body, the fluid passages therein, and the tubes extending through and fixed thereto preferably have a thermal conductivity of 15 Kcal/m/hr/.degree.C. or higher.