Abstract: Heat exchanger or heat accumulator bodies which are simple to produce. The bodies consist of a stack of extruded hollow chamber panels with plane smooth outer walls and webs that join the outer walls in a single piece. The hollow chamber panels are joined to one another in the stack on the front side by locking connections. The locking connections can be produced with an inserted electrical band heater, by glue seams, or by undercut interlockings. The hollow chamber panels are not joined to one another in the in-between areas or are not everywhere joined in the in-between areas.

Abstract: A ventilator of the heat exchange type includes an air passageway communicating between an interior of a room to be ventilated and the outdoors, a first centrifugal fan for introducing outdoor air to the interior of the room, a second centrifugal fan for discharging indoor air outdoors, both centrifugal fans being disposed within the air passageway so that outlet areas communicates to each other, and two electric motors for alternately driving the centrifugal fans respectively. At least any one of the centrifugal fans is formed of a heat-accumulative material so that heat contained in the indoor air is accumulated in the centrifugal fan formed of the heat-accumulative material and that the heat accumulated in the centrifugal fan is dissipated to the suction air. Heat exchange is thus performed by accumulating the heat in one of the centrifugal fans during indoor air discharge operation and by dissipating the heat to the outdoor air during outdoor air suction operation.

Abstract: A labyrinth articulation joint (38) for use in the seal frame (35) of a rotary regenerative air heater (20). An internal labyrinth arrangement of intercooperating tabs (54,55) and slots (44,45) in the two hinges (41,51) of the labyrinth articulation joint (38) present a series of successive right angle turns that increases the pressure drop through the labyrinth articulation joint (38) thus reducing the leakage of air through the labyrinth articulation joint (38), and thereby minimizing erosion of the labyrinth articulation joint (38) due to abrasive particles that would otherwise be carried through the joint by the leakage air.

Abstract: A ventilator unit (1) intended for installation in the outside wall of a room such that used air (A) from the room is vented to the outside atmosphere through the outside wall while fresh air (B) is introduced from the outside and supplied to the unit (1) where it is suitably air conditioned, before being blown into the room, the unit comprising an exhaust fan (12) and an inlet fan (13), and also including for purposes of heat recovery a heat exchanger (15', 15") for transferring heat from the outflowing air (A) to the inflowing fresh air (B), wherein the two streams of air (A, B), as known per se, alternate periodically through two equal regenerator masses.

Abstract: A simple method to prevent air pollution from the particulate and gaseous pollutants from power plants, by recuperating the heat in the flue gases down to atmospheric temperature and pre-heat the air needed from combustion in the boilers. Most fly ash is removed at the face of the regenerators. Condensed moisture from the flue gases dissolves SO.sub.2 and forms a smog, with remaining fly ash particles acting as condensation nuclei, which are caught on the wetted surfaces within the regenerator, washed therefrom to vessels to settle out solids, and the liquid is then treated by vacuum to recover the dissolved SO.sub.2, which is compressed to liquid SO.sub.2 and stored in refrigerated tank cars, to be sold as a valuable byproduct. The bulk of the fly ash, which settles on the face of (45 degree) sloping "snow fences" built across the top of the pebble bed, slides like snow off of a sloping roof and into gutters with perforated false bottoms, up which flows a little gas and carry it to downspouts and bins.

Abstract: A rotary regenerative air heater includes an improved intermediate linkage connecting the seal frame to the rotating hood frame. The linkage includes axially spaced plates laterally connected to each of the frames and interconnected to each other by a linkage designed to allow axial coplanar movement of the frames relative to each other.

Abstract: A regenerator includes a cylindrical body and a plurality of first and second wire mesh screens stacked inside the cylindrical body. Each first wire mesh screen includes a number of interwoven wires that overlap one another at the cross points of the wire mesh screen, with the overlapping wires being compressed at the cross points in the direction in which the wire mesh screens are stacked. Each second wire mesh screen includes a number of interwoven wires that overlap one another at the cross points of the wire mesh screen, the overlapping wires not being compressed at these cross points. The first and second wire mesh screens are stacked in the cylindrical body in such a manner that one or two of the first wire mesh screens is interposed between mutually adjacent ones of the second wire mesh screens.

Abstract: A corrosion-resistant storage body for a regenerator includes a multiplicity of carbon shapes having profiles formed thereon, the shapes being stacked together with the profiles spacing the shapes apart defining canals between the shapes passing through the storage body, and a frame holding the stacked shapes together.

Abstract: A regenerator includes a cylindrical body and a plurality of improved wire mesh screens stacked inside the cylindrical body. Each wire mesh screen includes a number of interwoven wires that overlap one another at the cross points of the wire mesh screen, with the overlapping wires being compressed at the cross points in the direction in which the wire mesh screens are stacked. This shortens the distance between the central axes of the overlapping wires at the cross points in the stacking direction so that a greater number of the wire mesh screens may be stacked in the cylinder.

Abstract: Control of the seal of a rotary regenerative air preheater is provided by a plurality of inductance sensors (S1-S8) arranged around the path of travel of seal parts borne by the rotating part of the preheater. When these are sealing frames borne on hoods of a stationary matrix type preheater (12) drive means such as magnetic actuators (5) are fed power signals through slip rings (4). When they are seal strips on a rotating matrix type, the drive means are mounted on the sector plates of the stationary body. A control circuit compares the signals received sequentially from the sensors and drives appropriate one or ones of the drive means to bring the sealing means to a predetermined axial relationship, or to hold them there. The sensors may be paired with comparison sensors in the same environment whereby to reduce errors due to changes in temperature etc.

Abstract: A regenerative-type thermal-storage heat exchanger having a thermal regenerator matrix formed by a plurality of radially spaced coaxial coils of solid cross-section thermal material surrounding a core. The matrix is formed from woven structures, each structure consisting of a plurality of longitudinal thermal members, a plurality of transverse cords woven through the thermal members and means for maintaining the thermal members in alignment during fabrication of the matrix. The matrix is formed by spirally winding the woven structure around a mandrel. After winding, the wound structure is inserted in a regenerator housing and the alignment maintaining means is then removed.

Abstract: A system is disclosed for recovering heat from high temperature combustion gases escaping from a heater such as for examples a domestic warm air furnace, boiler or the like. The system includes a first conduit leading to a chimney and a second conduit leading to a heat recovery unit which in turn is connected to a vent. A "T" connection interconnects the first and second conduits to each other and to the heater. The heat recovery unit artificially induces a draft in the second conduit which overcomes the natural draft induced in the first conduit by virtue of its connection to the chimney. An accelerator in the T connection increases the velocity of combustion gases flowing past the first conduit into the second conduit.

Abstract: A simple and profitable means to prevent air pollution from the particulate and gaseous pollutants from power plants, by recuperating the heat in the flue gases down to atmospheric temperature and pre-heat the air needed from combustion in the boilers. Most fly ash is removed at the face of the regenerators. Condensed moisture from the flue gases dissolves SO.sub.2 and forms a smog, with remaining fly ash particles acting as condensation nuclei, which are caught on the wetted surfaces within the regenerator, washed therefrom to vessels to settle out solids, and the liquid is then treated by vacuum to recover the dissolved SO.sub.2, which is compressed to liquid SO.sub.2 and stored in refrigerated tank cars, to be sold as a valuable byproduct.

Abstract: Apparatus for exchanging air within an enclosure with outside air while subjecting air within the enclosure to gas filtration and/or electronic air cleaning. The apparatus includes a two-position valve to provide an intake cycle and an exhaust cycle; during both cycles the air treatment means is operative on air within the enclosure.

Abstract: In the recovery of waste heat from flue gas containing particulate solids, CO.sub.2, SO.sub.2, SO.sub.3 and H.sub.2 O, several improvements are provided, e.g., passing hot flue gas, e.g., from a power plant, over heat exchange surface attackable by sulfuric acid, e.g., in a combustion air preheater, so as to release heat to said heat exchange surface and to partially cool said flue gas to a temperature within the range of about 350.degree. F.

Abstract: An air conditioner comprises an air-to-air heat exchanger; a fresh air supply duct, a fresh air by-pass duct, a used air exhaust duct, and a used air by-pass duct, the fresh air supply duct and the used air exhaust duct being respectively connected to the air-to-air heat exchanger, the fresh air supply duct having a part in common with the used air by-pass duct, and the used air exhaust duct having a part in common with the fresh air by-pass duct. Included are a condenser provided in the common part of the fresh air supply duct, and an evaporator provided in the common part of the used air exhaust duct, the condenser and the evaporator being parts of a heat pump. A blower is provided in the common part of the fresh air supply duct and is connected to the used air by-pass duct, and a separate blower is provided in the common part of the used air exhaust duct and is connected to the fresh air by-pass duct.

Abstract: The present invention is concerned with a control device for medium flows for a regenerative heat exchanger. The device consists of a cell (7) divided into compartments (8) and acting as a heat exchanger, and at the ends of the cell, there are control means (11, 12) for guiding the medium flows alternatingly into the different compartments (8) of the cell (7). In prior art, unreasonably high capacities of actuating devices have been required for controlling the flows of media, and the control devices have increased the length of the heat exchanger considerably. These drawbacks are avoided if the control means consist of a slide (11, 12) displaceable transversely in relation to the partition walls (9) of the cell, the said slide (11, 12) being provided with openings (13) and with blocking members (14) between the openings for the purpose of alternatingly opening and closing connections between medium flow ducts (2, 3, 5, 6) and compartments (8) in the cell.

Abstract: A flue gas scrubbing system for fossil fuel power plant boilers in which the flue gas traverses an air heater from the boiler and an electrostatic or another particulate removal unit before fully or partially passing through a heat exchanger which is used to reheat the clean gas produced by scrubbing all or part of the crude flue gas. To prevent water droplets in the clean gas from entering the heat exchanger, a portion of the crude gas or preferably a recirculated portion of the reheated clean gas is introduced into said clean gas before it enters the heat exchanger with or without further heating, e.g. in indirect heat exchange with a portion of the crude gas branched from a location upstream of the air heater.

Abstract: Heat recovery and replacement air preheating apparatus for use in industrial heat treating processes is disclosed as including at least a pair of thermal recovery and storage units, B, C wherein each storage unit contains a plurality of heat exchange elements 32, 33 which operate as heat sponges to pick up heat from exhausts as it leaves the dryer and subsequently to put that heat into entering replacement air whereby the cost in elevating the replacement air is greatly reduced. A control valve D, 62 connected between the two thermal storage units cycles the reverse exhaust and replacement air flows alternately through the thermal storage units in a manner that a substantial amount of exhaust heat is stored and transferred to the replacement air flow.

Abstract: A means for recovering the heat of a room space and for ventilation, consisting of at least two heat accumulators, to which the outgoing air delivers its heat and from which the incoming air takes up heat, and each of which has one end connected to the room space outflow duct and inflow duct, in which ducts the direction of flow is always the same under control by a flap. The opposite ends of the heat accumulators have been connected to the fresh air intake duct and to the outgoing exit duct, in which ducts the direction of flow is always the same under control by another flap.

Abstract: A heat storage cabinet for use in solar heating systems and the like. The cabinet is comprised of a pair of open ended shells adapted to be buckled together with shelf like containers of phase change materials to form a tortuous passage for hot air to heat the phase change heat storage material. Intermediate modules may be used between the end cabinets to increase the heat storage capacity. The cabinets may be made of fiber glass with ledges to resiliently receive the phase change shelves for ready installation. Through appropriate top and bottom openings in the cabinet duct work is provided for connection to the building to be heated, hot water tank or the like.

Abstract: A regenerative air preheater has a heat-exchange sector plate centered on an axis and formed with a multiplicity of axially throughgoing passages with intake and output heating-gas hoods axially flanking the plate and conduits for passing a heating gas from the intake hood through the plate to the output hood for heating the plate. Intake and output secondary heated-gas hoods each within one of the heating-gas hoods and axially flanking the plate are axially aligned with each other and only cover a portion of the plate. Thus the heating gas can pass through the plate only around the plate portion covered by the secondary hoods. Intake and output primary heated-gas hoods within the respective secondary hoods and axially flanking the plate are axially aligned with each other and only cover a subportion of the plate portion covered by the secondary hoods. Thus the secondary gas will be heated at regions of the plate portion not covered by the primary hoods.

Abstract: A sector plate for a regenerative air preheater has an outer support ring centered on an axis and normally of cylindrical shape, an inner support ring centered on the axis, and a plurality of radially extending walls lying generally in axial planes and having outer ends fixed to the outer ring and inner ends and guided on the inner ring. A plurality of angularly extending and radially spaced annular walls extend between the radial walls and form therewith axially throughgoing passages. Thus when hot gases flow in one axial direction through the passages they thermally deform the radial walls so that their ends move into a position at an angle to each other. The ring is thermally deformed to a taper equal to twice the angle for holding the inner ends of the radial walls and the inner ring in the axially level with the outer ring when hot gases flow through the passages.

Abstract: A sensibe heat storage unit is provided which has a "step function" thermal gradient, and is constructed so as to have alternated regions of different thermal conductivity along the flow path through the unit such that, in one embodiment, there are spaced elements within the storage unit having transverse conductivities higher than the conductivity of the material in the spaces therebetween. This permits discharge of the storage unit at a uniform temperature until the storage unit is emptied.

Abstract: A recovery-type furnace for the indirect transfer of heat between two gaseous fluids flowing in opposite directions comprises two heat exchanging units which function alternately as a heating and a heated unit and which operate on a reversing cycle of a few seconds to several minutes. Each exchanging unit is packed with at least one bed of ceramic particles that rest on a metal or ceramic support. The direction of gas flow is controlled by reversing devices so that the hot gaseous fluid flows to the top of the particle bed of the heated unit and, upon cooling, passes through the bed support and from the bottom of the particle bed downwardly through the unit.

Abstract: A plate-type heat exchanger for hot gas engines of the Stirling type includes stacked pairs of elongated rectangular plates joined at the longitudinal edges with spaces between the paired plates constituting the cold gas flow passages and spaces between plate pairs constituting the hot gas flow passages. Paired plates have mirror image protrusions protruding from the respective abutted longitudinal margins, which protrusion form the internal cold gas flow passages and also provide the spacing between adjacent abutting pairs that constitutes the hot gas flow passages. Abutting plates of adjacent stacked pairs are joined at the abutting transverse margins.

Abstract: Regenerative heat exchange apparatus (12) for the transfer of heat from a heating fluid (hot gas) to a fluid to be heated such as air. Valve means (16-A, 18-A, 22-A, 24-A) control the flow of heating fluid and the fluid to be heated to and through their respective ducts in the heat exchanger. A bypass duct (38) reversely directs heating fluid through the heat exchanger (12) to displace heated air trapped therein after the valve (24-A) controlling the air supply has been closed.

Abstract: Heat recovery and replacement air preheating apparatus for use in textile heat treatment machinery is disclosed as including a pair of thermal recovery and storage units wherein each storage unit contains a plurality of thermal mass disks which operate as heat sponges to pick up heat from exhausts as it leaves the dryer and subsequently to put that heat into entering replacement air whereby the cost in elevating the replacement air is greatly reduced. A control valve connected between the two thermal storage units cycles the reverse exhaust and replacement air flows alternately through the thermal storage units in a manner that a substantial amount of the exhaust heat does not reach the ambient environment and the alternating replacement air flow maintains the thermal heat recovery and storage units and associated apparatus cool and clean of lint and the like residuals.

Abstract: A method and apparatus for thermal storage having a movable manifold which discharges thermal transfer fluid to trickle through a particulate solid thermal storage medium to be collected for distribution or recirculation in a manner such as to establish a vertical thermocline within said thermal storage medium, said thermocline being movable horizontally with said manifold.

Abstract: An apparatus for the elimination of fumes and odors from exhaust gases simultaneously with the recovery of heat from such gases and, in particular, a rotating control means for controlling the flow of such gases, in sequence, through heat exchange chambers and a central purification chamber of such apparatus wherein the gases are preheated and incinerated to remove fumes and odors. The apparatus has annular inlet, exhaust and purging ducts located adjacent a number of heat exchange chambers disposed adjacent a purification chamber. The flow of gases from and to the ducts through selected heat exchange chambers is maintained by a rotating control means disposed between the ducts and the heat exchange chambers.

Abstract: An installation for storing and recovering heat energy having a principal application in solar power stations.The heat produced is stored in a storage reservoir when the converted energy demanded is less than the heat energy produced, and recovered in the opposite case, these operations being carried out entirely automatically. The heat transfers are effected through a thermofluid able to flow by streaming over containers of any shape, enclosing a heat storage substance, and disposed loosely or methodically in said storage reservoir.

Abstract: A forced air furnace includes a conventional fuel fired, primary heat exchanger and a secondary heat exchanger associated with the stack. The secondary exchanger includes a phase change material having a transition temperature within the range of the stack temperature, and which is disposed in heat exchange relation with the flue gases flowing through the stack. The secondary exchanger also includes duct means for conveying the circulated air in heat exchange relation with the phase change material; and the flow path through the secondary exchanger is an alternative path controlled by a damper. When the primary exchanger is turned on, the phase change material in the secondary exchanger is charged from the flue gases of the primary exchanger. When the phase change material is in condition to release stored heat, a temperature responsive control shuts off the primary exchanger and diverts the circulated air through the secondary exchanger.

Abstract: Light weight, compact and efficient thermal energy reservoirs are described in which thin layers of a heat storage material, such as an inorganic salt having a high latent heat of fusion, are heated or cooled by an intermittent primary energy source, such as solar or off-peak electric power. The stored energy is utilized during periods when the primary energy source is not available. The heat storage material is contained in flat fluid tight packages, such as a heat sealed polyethylene film bag, which can readily be removed and replaced through removable panels or doors in the insulated reservoir enclosure.

Abstract: A regenerative heater includes a regenerator container having open opposite ends. The container contains therein a fill of heat retaining material which is permeable to the passage therethrough of gas, throughout the entire length thereof in opposite directions between the open opposite ends of the container. The fill of heat retaining material comprises solid fine granular particles having a low thermal conductivity. A heat source is positioned adjacent the first end of the fill of heat retaining material. At least one blower is provided for circulating gas in opposite directions through the entire length of the fill of heat retaining material and across substantially the entire cross-section thereof. A charging flow of gas is first circulated in a first direction through the fill of heat retaining material, such that the charging flow of gas is heated by the heat source and then passes through the heat retaining material while transferring heat to the heat retaining material.

Abstract: Regenerator for a cryogenic system has lead sphere 58 packing and has grooves 54 and 56 in the regenerator walls to prevent gas bypass. Felt packing 66 between screens 64 and 68 causes continued compression of the regenerator packing as it changes size due to temperature changes. Gas spaces between the regenerator spheres is maintained low and regenerator sphere damage due to high intersphere loading is minimized.

Abstract: A plurality of individual, isolatable storage bins carrying a desiccant such as silicon gel are selectively placed in communication with a heat reclaim/solar collector within a gas circulation loop to permit the desiccant material to be dried and to store heat almost indefinitely in its dry state. The bins may be selectively connected within a second circulation loop, including a room to be conditioned such that a second gas circulated over the desiccant and to the room varies the moisture content of the desiccant to release heat and to thereby effect controlled heating or cooling of the air within the room, as needed, and irrespective operation of the heat reclaim/solar collector.

Abstract: Aqueous saline solutions are converted in part to potable water by passing a compressed aqueous saline solution through one or more beds of contained pellets of higher temperature to heat the aqueous solution to a flash vaporization temperature, then passing the solution to one or more flash vaporization zones. Vaporized potable water from each vaporization zone is separately passed to contained bed of pellets where water is condensed and pellets heated. Simultaneously, a bed of pelletized solids is heated to supplant the highest temperature bed in the system used for heating. By selective switching of beds, the system is kept in continuous operation with a heated bed of pellets replacing the highest temperature bed previously used to heat the aqueous saline solution. The bed used for water condensation is transferred to the heating cycle for subsequent introduction to the system.

Abstract: A regenerative air preheater with guide devices serving the supply and exhaust of flue gas as well as air to be heated from at least two separated partial streams and with a heat exchanger body, which heat exchanger body, by means of a relative movement between the guide devices and the heat exchanger body, alternately has passed through it heat emitting flue gas and air to be heated, whereby the temperature of the separated partial streams is regulatable. On the side of the flue gas outlet from the heat exchanger body between the dome-like guide devices for the air to be heated, a cover cap is arranged in the vicinity of one exhaust gas partial stream, which cover cap is provided with individual exhaust channels for transporting of the one exhaust gas partial stream into the other exhaust gas partial stream.

Abstract: A furnace having a nitrogen-heat separator comprised of a heat absorbing mass, such as cast iron plates, containing passages through which products of combustion can pass and deposit heat into the metal mass to thereafter be extracted and utilized, a baffle for directing products of combustion through the nitrogen-heat separator, a fiberglass cloth heat-retaining curtain for blocking the furnace exit and trapping heat inside the furnace when fuel combustion stops, a fan for extracting the stored heat from the nitrogen-heat separator when combustion stops and circulating it throughout the furnace interior.

Abstract: A compressed-air storage installation comprising a heat accumulator for storing heat contained in compressed air and the air is passed into subterranean caverns. The heat accumulator has partitions therein which are provided between a storage medium. The partitions form a number of air passages through which the hot compressed air entering at the central region of the heat accumulator flows in an essentially outward direction, thereby cools and flows on into the cavern.BACKGROUND OF THE INVENTIONThe present invention relates to a new and improved construction of a compressed-air storage installation having a heat accumulator for storing heat contained in compressed air, with the compressed air being passed into subterranean caverns.It is already known to employ compressed air instead of liquids as a storage medium for storing energy. The state-of-the-art compressed-air storage installations store compressed air at times of low load and utilize it at times of peak load to generate additional peak load energy.

Abstract: A combustion device comprising a plurality of regenerative units formed by a plurality of separate radially extending compartments each containing a plurality of corrugated highly conductive metal plates compressed together with the corrugations in the adjacent plates intersecting each other at right angles so as to provide meandering passages for the gases between the adjacent corrugated plates; a rotary switching valve provided at one end of said regenerative means for controlling the flow of said waste gases flowing therethrough; a reaction zone provided at the other end of said regenerative means in which said waste gases are reacted; and a temperature-adjusting chamber located within said reaction zone and provided with an auxiliary combustion burner and an excess-heat disposal branch conduit.

Abstract: A stationary-mass rotary regenerative air preheater uses a single regenerative mass for the separately controllable heating of different streams of air. This is achieved by providing at each axial end face of the mass rotating cowls divided into rotationally symmetrical hoods each of which is sub-divided into sector-shaped compartments which have the same radial extent as the mass. A given compartment of one hood on one end face is angularly of the same extent as the corresponding compartment of the other hood on that end face. The compartments are brought to coaxial connecting ducts at the neck of each cowl. Separation of media flows even under temperature or pressure differences is assured by sealing strips at each of the radially extending walls of each hood; these are automatically operated, and those on internal (sub-dividing) walls may be operatively linked to those on external walls.

Abstract: A filling mass for low-temperature regenerators comprising one or more of the compounds of the formula A.sub.1-x B.sub.x Rh.sub.1-y X.sub.y, wherein A = Sm, Gd, Tb, Dy or a mixture thereof, wherein B = Ho, Er, Tm, Yb or a mixture thereof, wherein X = Cu, Zn, Ru, Pd, Ag, Re, Os, Ir, Pt, Au or a mixture thereof, and wherein 0.ltoreq..times..ltoreq.1 and 0.ltoreq.y<0.2.

Abstract: A process and plant is provided for the production of nitric acid from atmospheric air in which the feed air is passed in succession through a number of stages each comprising a high temperature regenerative nitrogen fixation reactor followed by a catalytic oxidation reactor and a nitric oxide absorber, all operating at superatmospheric pressure. Heat is exchanged between the inlet and outlet gas streams of each stage absorber. The compressors are driven by a turbo-expander powered by the exit gas stream in which fuel has been burned upstream of the turbo-expander. The nitrogen fixation reactors each consist of a pressure vessel enclosing a gas-permeable refractory wall surrounding a furnace chamber in which fuel is burned, the interior of the vessel being divided into two sections by an impermeable wall with a gap for flow through in the furnace zone.

Abstract: A regenerative air preheater with cylindrical regenerator chamber and sealing frames at its axial ends with adjustable automatic thermal compensating devices for uniformly maintaining a constant sealing gap by adjustable means under different heat distortions of the regenerator chamber. The sealing frames are movable on spring-loaded pins and the axial travel of said frames is automatically equalized to the axial distortions of the regenerative chamber by said automatic thermal compensating devices in such a way, that they may follow the axial distortion movement of the regenerator chamber in a constant distance of a predetermined sealing gap, which had been adjusted, said compensating devices are controlled by their temperature-responsiveness, preferably in accordance with the mean temperature difference across the mass. As shown, they are made up by partially compensating thermal expansive devices, tied to a lever linkage with adjustable means.

Abstract: A regenerative heat exchanger particularly for a gas turbine engine in which there is a stationary heat-storing matrix in each of the flow-paths for the fluids between which heat exchange is to take place and at least one valve member defining a common wall between the flow-paths and movable between two extreme operable positions, in one of which one of the fluids passes through one of the flow-paths and the matrix associated therewith and the other of the fluids passes through the other of the flow-paths and the matrix associated therewith and in the other extreme position the fluid flow through the respective flow-paths is interchanged.

Abstract: A low void volume regenerator for use in a Vuilleumier Cooler made by bong alternating thin layers of copper and teflon and cutting radial slots into the regenerator.

Abstract: Disclosed are a system and method for extracting heat from hot unrefined water for the purpose of using this heat to do useful work, and specifically for extracting such heat while minimizing the undesirable effects caused by formation of scale and other solid build-up of scale-forming impurities in the hot unrefined water. Before contact with a heat exchange surface the hot unrefined water has added thereto an agent capable of increasing the formation of non-scale-forming species of said scale-forming impurities. These agents may be added immediately before passing the hot unrefined water through heat exchange equipment and/or directly into a geothermal well.

Abstract: A ventilation device for ventilating rooms in dwelling locations, or other spaces such as workman's barracks, cold storage and freezing rooms, and the like. An elongated housing is provided with a fan at one end with a reversible motor for controlling the direction of the fan. Heat holdover means comprising a series of heat-exchange plates is positioned in the housing and parallel to the direction of the air flow. Thermostats are provide at both ends of the housing for sensing the temperature of the air flowing by and thereby operating the reversible motor, thus controlling the direction of the fan.

Abstract: A system and method for extracting heat from hot unrefined water and ultimately using this heat to do useful work, while avoiding the danger of damage to heat exchange equipment by scale and corrosion, which is many times attendant on such methods. The hot unrefined water is passed through a housing containing porous material giving up its heat to the porous material. A volume of clean water is then passed through the housing picking up the heat from the porous material. The heated clean water can then be passed through a more or less conventional heat exchanger without danger of damaging the internal surfaces of the exchanger with scale and corrosion.