Abstract: An arrangement is provided in an air preheater for mounting and adjusting the axial seal plates in relation to the rotor using a reduced number of adjustable mountings and replacing the remaining adjustable mountings with adjustable compression stops. These adjustable compression stops engage but require no attachment to the axial seal plates. This reduces the work necessary in the limited space between the air preheater housing and the axial seal plates thereby reducing costs and facilitating installation and replacement.

Abstract: Rotatably supported, regenerative fluid treatment wheel assemblies include a wheel with circumferential rim and track, a housing in which the wheel is disposed and a plurality of rollers disposed within the housing in rolling engagement with the track to locate a wheel axially and radially within the housing. Seal flanges are provided projecting radially outwardly from the rim and are opposed by flexible seals which are clip mounted to walls of the housing surrounding openings through those walls which are aligned with the wheel. At least one wheel is preferably spring loaded so to compensate for any eccentricity in the wheel. The wheel is belt driven. A subassembly, including a mounting plate, flange-mounted motor, drive pulley and spring loaded idler pulley is provided for easy installation and removal. Wear strips appropriate for contact with either the seal flanges or face of the wheel core are applied to the flexible seals by pressure sensitive adhesive.

Abstract: The present invention relates to a device generating a hot air flow, including an air source generating an air flow at its outlet (17), a heating system (13) generating heat energy and heat-exchange elements (27) capable of storing heat energy generated by said heating system (13) and of yielding this heat energy to said air flow.According to the invention, said heating system (13) and said air source are mounted fixed, and said heat-exchange elements (27) are arranged on a mobile support (3) capable of continuously renewing the heat-exchange elements (27) arranged in said air flow and previously heated by said heating system (13).

Abstract: A regenerative heat-exchanger is disclosed which has a rotor mounted in an enclosing housing, with separation zones radially disposed between the heat exchange media and configured as peripheral and radial barrier chambers, and stationary peripheral and radial seals which are arranged on hot and cold sides of the rotor.

Abstract: A high efficiency hot air furnace transfers substantially all of the combustion heat of a clean fuel gas fire to a stream of cool recirculating air by two heat exchangers both of which are mounted in a common plenum through which cool air is recirculated by means of a blower. It differs from the conventional high efficiency furnace in that the secondary heat exchanger is a porous movable heat sink which is alternately exposed to a stream of hot combustion gas and a part of the cool air stream from the recirculating air blower.

Abstract: A rotary regenerative air preheater has bypass seals located at the top and bottom of one side of each sector of heat exchange baskets located at the top and bottom of the adjacent diaphragm and sealing the gap between that one side of the baskets and the diaphragm. The bypass seals are metal strips extending along the radial length of the diaphragm with a main body portion attached to the diaphragm and a bent leg portion extending outwardly to engage the baskets. The bypass seals are notched to fit over the stay plates and are attached over the radial seals to hold the radial seals in position.

Abstract: The present invention is an arrangement of seals for an air heater used to preheat the intake air of a combustion process. Flexible seals and torsion bars are utilized in order to allow the flexible seals to adjust angle and properly fill the void space to be sealed. Also, a combination of sealing elements are used on the circular seal of the present invention in order to create a tortuous path for gas flow through the seals. The present invention offers many advantages over seals found in the prior art including improved wearability and low maintenance.

Abstract: Incompressible ceramic heat exchange blocks which may be catalyst coated having gas flow channels therethrough or other incompressible heat exchange surface are supported in a metal framework to form a removable basket for a rotary regenerative air heater. Between selected rows of the incompressible heat exchange material are layers of compressible corrugated metal heat exchange plates. This layered structure is packed into the framework in the compressed state.

Abstract: For the sealing of a gap between at least two components or groups of components which are movably arranged with respect to one another, particularly of a heat exchanger, a device is indicated in the case of which a strip-shaped sealing body, which is connected with one component, is sealingly and movably guided in a groove of the other component, and in the case of which the sealing body is composed in the manner of layers of elements, in the longitudinal direction of the gap. The layers are arranged to be displaceable and freely expandable, are suspended at one component in a swivelling manner, and are spatially movably guided on the other component by way of the groove, with a clamping effect.

Abstract: A rotary regenerative air preheater has a rotor which is divided into sectors by diaphragm plates. Mounted between these diaphragms are support gratings which support the heat exchange baskets with there being at least two circumferentially adjacent full-wrapper baskets on each support grating. The gratings include radial seals which extend axially into the spaces between these adjacent baskets to provide a seal to minimize circumferential fluid flow. Attached to the radial seals at the axial ends of the rotor are seal strips which form a seal with the sector plates on the rotor housing thereby forming a double seal to minimize cross flow between the gas side and the air side.

Abstract: A seal assembly for use in precluding leakage of hot combustion products along the shaft of a rotating heat exchanger wheel utilized in a power plant. The seal assembly includes a housing positioned in surrounding relation to the shaft and defining an annular chamber around the shaft having an inboard end and an outboard end; a positive annular fluid seal with the shaft proximate the outboard end of the chamber; and a leakage annular fluid seal with the shaft proximate the inboard end of the chamber. The positive annular fluid seal comprises a packing ring surrounding the shaft and an annular bladder positioned in surrounding relation to the packing ring and constrained against radial enlargement so that the bladder expands radially inwardly in response to receipt of pressurized fluid to urge the packing ring into sealing engagement with the shaft.

Abstract: A modular recuperator apparatus and method that is used to pre-condition air treatment in a HVAC and air processing systems. A modular recuperating system enhances the overall efficiency of modern HVAC systems by reducing the required relative treatment of air within the system by supplying pre-conditioned fresh air into the system.

Abstract: The present invention is an arrangement of seals for an air heater used to preheat the intake air of a combustion process. Flexible seals and torsion bars are utilized in order to allow the flexible seals to adjust angle and properly fill the void space to be sealed. Also, a combination of sealing elements are used on the circular seal of the present invention in order to create a tortuous path for gas flow through the seals. The present invention offers many advantages over seals found in the prior art including improved wearability and low maintenance.

Abstract: An air heater perimeter seal provides independent positive control of the leak path induced by relative radial and axial movements at the rotor perimeter. A seal member with a relatively wide seal face disposed in a plane perpendicular to the air heater axis allows the seal member to stay within the radial width of the corresponding seat during expansion and contraction of the rotor as it moves from the air side to the discharge gas side and back. In addition, the installation adjustability and the tolerance for radial error of the seal of the present invention makes it possible for out-of-round rotors and warped housings to be properly sealed. An axial slip joint between the seal member and the rotor allows the seal face to remain adjacent to the face of the sector place and to the seat face regardless of rotor droop. The axial slip joint also acts as a labyrinth seal to control leakage of gasses between the housing and rotor.

Abstract: A regenerative device can thermally treat gases. This device has a housing with a gas inlet and a gas outlet. A cage having a central interior is rotatably mounted in the housing between the inlet and the outlet. A plurality of gas permeable blocks are mounted peripherally in the cage around its central interior to provide therethrough: (a) an incoming flow path from the inlet to the central interior, and (b) an outgoing flow path from the central interior to the gas outlet. This incoming flow path within the blocks is non-converging. A drive motor can rotate the cage to move blocks successively past the inlet and the outlet.

Abstract: A sealing member for use in a gas preheater is adapted to seal a gap between an outer peripheral portion of a rotor and a housing in the gas preheater or a gap between a side face of the rotor and a radial sealing member. At least a part of said sealing member is made of an inorganic glass and/or a wear resistive ceramic having a coefficient of thermal expansion of not more than 70.times.10.sup.-7 /.degree. C. A sealing member for use in a gas preheater may comprise a heat resistive ceramic, and a corrosion resistive steel, wherein the ceramic is substantially surrounded with the corrosion resistive steel, excluding a sliding surface of the ceramic.

Abstract: The present invention involves a regenerative thermal oxidation apparatus for purifying gases by thermal oxidation and for exchange of heat between inleting and outleting gases. The apparatus has a plurality of thermal chamber units, each such unit having a gate with at least one gate orifice movably located in a linear fashion against a base surface so as to alternatively align with various inlet and outlet openings. The improvement involves the use of a plurality of seals located between the gate and the openings with sufficient sealing capabilities between the gate and the openings to maintain each chamber at an elevated pressure, i.e. above atmospheric pressure, and so as to reduce leakage of gases from each of the chambers and reduce condensation during operation. The invention is also directed to the method utilizing this apparatus.

Abstract: A heat recovery ventilator having a rotary wheel heat exchanger includes a unique configuration for driving both the rotary wheel heat exchanger and impellers to provide an inexpensive, compact and light-weight ventilator unit adaptable for use across a wide range of residential, commercial and industrial applications. A random matrix media is also used to provide high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams.

Abstract: A heat recouperator having a rotary wheel heat and moisture exchanger uses a random matrix media comprising a plurality of small diameter heat-retentive fibrous material which provides high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams.

Abstract: A sealing structure for a rotary regeneration-type heat exchanger, the sealing structure being adapted to seal at least one of a gap between an outer peripheral portion of a rotor and a stationary housing and a gap between a side face of the rotor and a radial sealing plate, the sealing structure being held by one of the rotor and the housing such that the sealing structure is in sliding contact with an opposing surface of the other of the rotor and the housing, the sealing structure including a metal frame, a main body including an alumina body and a glaze covering a portion of the alumina body, the glaze having a coefficient of thermal expansion smaller than that of the alumina body, the main body including an uncovered surface which is not covered with the glaze thereby exposing the alumina body, and retaining means for retaining the main body inside the metal frame, wherein the uncovered surface is exposed from the metal frame, the uncovered surface at least partially defining a sliding surface of the sea

Abstract: A heat recovery ventilator having a rotary wheel heat exchanger uses a random matrix media of randomly interrelated small diameter heat-retentive fibrous material to provide high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams for residential, commercial and industrial applications.

Abstract: A sealing member for use in a gas preheater is adapted to seal a gap between an outer peripheral portion of a rotor and a housing in the gas preheater or a gap between a side face of the rotor and a radial sealing member. At least a part of said sealing member is made of an inorganic glass and/or a wear resistive ceramic having a coefficient of thermal expansion of not more than 70.times.10.sup.-7 /.degree.C. A sealing member for use in a gas preheater may comprise a heat resistive ceramic, and a corrosion resistive steel, wherein the ceramic is substantially surrounded with the corrosion resistive steel, excluding a sliding surface of the ceramic.

Abstract: The present invention is an arrangement of seals for an air heater used to preheat the intake air of a combustion process. Flexible seals and torsion bars are utilized in order to allow the flexible seals to adjust angle and properly fill the void space to be sealed. Also, a combination of sealing elements are used on the circular seal of the present invention in order to create a tortuous path for gas flow through the seals. The present invention offers many advantages over seals found in the prior art including improved wearability and low maintenance.

Abstract: A sealing arrangement for a regenerative air heater having a stator with a peripheral flange and hot and cold end hoods mounted for rotation over respective opposite surfaces of the stator, includes a seal frame which is connected to the cold end hood over an expansion joint assembly. A plurality of cast iron seal shoes are connected to the frame and positioned at selected gaps from the stator flange. A wheel rotatably mounted to the frame near each seal shoe rolls against the stator flange to maintain the selected gap while a counter weight on a lever acts to urge the seal shoes toward the flange. The arrangement is automatic in its maintenance of the selected gap.

Abstract: A heat exchanger for a gas turbine employs a duct housing assembly including an air duct housing and a gas duct housing. The air and gas duct housings have semicircular platforms, respectively. They are assembled in a spaced relationship with their platforms coplanar with each other, so that a gas leakage between the platforms and the adjacent axial end face of a heat exchange core disc is effectively prevented.

Abstract: An improved element basket for a rotary air preheater includes at least one imperforate steel sheet, tack welded to the basket exterior, completely covering one side of the basket. A distal edge portion of the sheet is bent back upon itself and is biasable against a wall surface of the air preheater rotor. The side sealing member fills the gaps between the element basket and the adjacent rotor compartment wall, preventing gas or cold air from bypassing the heat transfer elements in the basket.

Abstract: A sealing structure for an air preheater is provided for maintaining a constant clearance between the drum and deformable sector plates. Deflection governing struts or beams extend across the sector plates and bend in a manner which corresponds with the change in shape which the drum undergoes when its temperature changes. The outer ends of the struts are connected to an outer ring engaged with the drum via guides. As the drum deforms so that its ends assume approximately partial spherical curvatures in response to increased temperatures, the struts are likewise deformed. The deformation of the sector plates is controlled by the more rigid struts.

Abstract: A sealing arrangement for a regenerative air heater having a stator with a peripheral flange and hot and cold end hoods mounted for rotation over respective opposite surfaces of the stator, includes a seal frame which is connected to the cold end hood over an expansion joint assembly. A plurality of cast iron seal shoes are connected to the frame and positioned at selected gaps from the stator flange. A wheel rotatably mounted to the frame near each seal shoe rolls against the stator flange to maintain the selected gap while a counter weight on a lever acts to urge the seal shoes toward the flange. The arrangement is automatic in its maintenance of the selected gap.

Abstract: A flexible radial bi-directional seal for sealing a diaphragm against a sector plate in a rotating drum-type air preheater includes a baseplate assembly having a pair of rigid baseplates. Each baseplate has a planer section and a flange, with the baseplates joined together and the flanges generally curving away from each other and forming a longitudinal slot therebetween. A replaceable pack assembly includes a pack of parallel planer leaves separated by spacers. The replaceable pack is removably attached to the baseplate assembly with engagement edges of the leaves of the replaceable pack engaging the longitudinal slot.

Abstract: A rotary heat regenerator comprises a regenerator matrix mounted for rotation in a central aperture of a housing wall, and an improved seal disposed in the annular gap between the matrix and the housing wall. The seal includes (a) a first portion of pile-like material which is secured to the peripheral surface of the matrix, and (b) a second portion of pile-like material which is secured to the housing wall such that the two interact to provide a seal while allowing the matrix to rotate in the aperture.

Abstract: A segmented seal is disposed between a rotary heat-retaining body and its housing, the housing defining a hot flow path and a cool flow path through the housing and intersecting the heat retaining body, and the heat retaining body being movable to transfer heat from one flow path to the other. A plurality of serially-connected seal segments are attached to one of the body and the housing, the seal segments each extending along a seal line and overlapping one another along the seal line, the seal segments bearing against the other of the body and the housing to effect a seal.

Abstract: A rotary heat wheel structure for a rotary heat exchanger in which a rotating wheel is provided with heat exchange material and rotates within a wheel housing to continuously cross an inlet path of low pressure cooler gas and an outlet path of high pressure hotter gasses for pre-heating the gas in the inlet path for utilizing the heat in the burned gasses before discharge to atmosphere. The wheel housing encloses the periphery of the wheel and is also provided with housing pillars defining an inlet path opening and an outlet path opening through which the rotary wheel rotates. Interior surfaces of the housing pillars are provided with radially extending grooves which co-act with opposite side faces of the rotary wheel to provide turbulence between the wheel side faces and the pillar surfaces so that leakage of gasses from the outlet path to the inlet path in the wheel housing is reduced.

Abstract: A flexible radial bi-directional seal for sealing a diaphragm against a sector plate in a rotating drum-type air preheater includes a baseplate assembly having a pair of rigid baseplates. Each baseplate has a planar section and a flange, with the baseplates joined together and the flanges generally curving away from each other and forming a longitudinal slot therebetween. A replaceable pack assembly includes a pack of parallel planar leaves separated by spacers. The replaceable pack is removably attached to the baseplate assembly with engagement edges of the leaves of the replaceable pack engaging the longitudinal slot.

Abstract: A rotatable regenerator of toroidal configuration is frictionally driven by a single roller disposed internally of the toroid.

Abstract: A regenerator seal assembly including a flat platform having a wear face slidably engaging a matrix disc and an opposite seal face, a plurality of naturally planar thin and flexible metal strips arrayed in end-to-end overlapping relationship on a bevel surface of the engine adjoining the matrix disc with an outer edge of each strip engaging the platform seal face and forming a gas seal thereat, an elastomeric seal element in a groove in the bevel surface engaging a high pressure side of each metal strip to define a gas seal between the elastomeric element and the metal strips, and a retaining shoe engaging a low pressure side of each metal strip and pressing the latter against the elastomeric element with sufficient force to effect the aforesaid gas seal but with insufficient force to rididly attach the metal strips to the bevel surface.

Abstract: A rotary heat regenerator assembly comprising an enclosure, a regenerator matrix disposed in the enclosure and releasably mounted on a matrix support secured to a rotatable shaft, a first air passage and associated blower for forcing air through a portion of the regenerator wheel, and a second air passage and associated blower for forcing air to flow through another portion of the regenerator wheel. The matrix and matrix support are designed so that rotational drive is transmitted from the rotatable shaft to the matrix via the matrix support and so that the matrix can be easily and quickly inserted on and removed from the matrix support. A blower driving motor and the blowers are mounted on a common shaft. Speed reducing driving means connects the common shaft to the rotatable shaft carrying the matrix.

Abstract: A rotatable toroidal regenerator has a pair of circumferentially spaced annular seals disposed thereabout that separate the hot and cold sections of the regenerator from one another.

Abstract: A sealing arrangement for an air preheater for a fuel burning device includes both radial and circumferential seals. The radial seals include a set of flexible, foil-like metal sealing strips coupled to semi-rigid radial seal plates. The semi-rigid radial seal plates, in turn, are coupled to diaphragm members which divide a generally cylindrical drum of the air preheater into sectors, each sector containing a set of heat exchanger elements, such as parallel plates or fins. To effect sealing, the foil-like metal radial sealing strips will engage and wipe across sector plates on a housing surrounding the drum. The radial sealing strips are completely unobstructed from cantilevered yielding movement in a trailing direction to the full extent that the flexure characteristics of the radial sealing strips themselves permit. the circumferential sealing strips are also constructed of a flexible, thin, foil-like metal material.

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 seal assembly for disposition between a cross arm on a gas turbine engine block and a regenerator disc, the seal assembly including a platform coextensive with the cross arm, a seal and wear layer sealingly and slidingly engaging the regenerator disc, a porous and compliant support layer between the platform and the seal and wear layer porous enough to permit flow of cooling air therethrough and compliant to accommodate relative thermal growth and distortion, a dike between the seal and wear layer and the platform for preventing cross flow through the support layer between engine exhaust and pressurized air passages, and air diversion passages for directing unregenerated pressurized air through the support layer to cool the seal and wear layer and then back into the flow of regenerated pressurized air.

Abstract: A combustor for use in an external combustion engine having a rotary-type regenerator heat exchanger includes a housing having a combustion chamber, an air chamber, a plurality of first outlet ports, and a first inlet port. A main partition defining the combustion chamber and the air chamber in the housing has a plurality of second outlet ports defined in a peripheral portion thereof and a second inlet port defined in a central portion thereof. An annular regenerator is rotatably supported in the housing, dividing the air chamber into first and second chambers, the regenerator having first and second axially opposite end surfaces and a multiplicity of axial through-holes extending therebetween. First subpartitions define first outlet passages communicating between the first outlet ports, respectively, and the first end surface of the regenerator, and divide the first chamber into air and exhaust sections.

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 sealing arrangement for an air preheater for a fuel burning device includes both radial and circumferential seals. The radial seals include a set of flexible, foil-like metal sealing strips coupled to semi-rigid radial seal plates. The semi-rigid radial seal plates, in turn, are coupled to diaphragm members which divide a generally cylindrical drum of the air preheater into sectors, each sector containing a set of heat exchanger elements, such as parallel plates or fins. To effect sealing, the foil-like metal radial sealing strips will engage and wipe across sector plates on a housing surrounding the drum. The radial sealing strips are completely unobstructed from cantilevered yielding movement in a trailing direction to the full extent that the flexure characteristics of the radial sealing strips themselves permit. The circumferential sealing strips are also constructed of a flexible, thin, foil-like metal material.

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 regenerative heat exchanger having a heat-exchanging storage medium which is provided with a plurality of flow channels. At each end there is provided a respective hood, which divides the storage medium via radial sealing members into at least one portion which receives heat-emitting gases, and at least one portion which receives heat-absorbing gases, with said portions, as a result of a continual relative rotation between the storage medium and the hood, alternately receiving the two types of gases. Sealing members are also disposed along the periphery between the hoods and a housing which accommodates the storage medium. In order to simplify the construction, reduce the amount of space required, and to improve the efficiency and avoid periodic down times for cleaning and in particular the leading edges of the storage medium, the radial sealing members are embodied as sealing strips which rest yieldingly directly against the respective planar end face of the storage medium.

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 rotary regenerative heat exchanger 10 having a rotor 12 mounted to a central rotor post 18 for rotation within a surrounding housing 20 whereby heat absorbent material carried in the rotor is alternately exposed to a flow of heating gas and a gas to be heated. A radial seal assembly 50 including a flexible sealing strip 72 is mounted to the hot end edge of each radially extending partition 16 of the rotor 12 to establish a seal across the gap between the radially extending partitions 16 and the confronting face of the sector plate 24 of the housing 20 as the rotor is rotated. Each radial seal assembly 50 is provided with a back support leaf 64 having an outward portion 68 which provides a backstop to limit the backward bending of the flexible sealing strip 72 so as to preclude stressing of the sealing strip beyond its yield point.

Abstract: A rotary-type heat exchanger comprises a rotor having gas passages in the direction of its shaft, a casing for said rotor, an entrance of said casing to guide the high temperature incoming gas to be used for the heat exchange exclusively toward said rotor except for the gas passages outer periphery thereof and the areas close to the shaft of said rotor, a heat insulation being treated on the inner wall of said entrance, a sealing member for high temperature being provided on the entrance toward said rotor to keep the gas leakage minimum, an exhaust gas outlet of said casing being provided on the side opposing to said entrance to guide all the exhaust gas passed through said rotor to outside, a sealing member being provided on the exhaust gas outlet toward said rotor of said exhaust gas outlet to keep the gas leakage minimum, an outer fresh gas inlet of said casing to guide outer fresh gas into said casing, for heat exchange and cooling an outlet port of said casing being provided on the side opposing to said

Abstract: The apparatus includes a housing that is divided into two parallel passages. A fan in one passage causes air from the outside of a building to flow through one of the passages into the building and a fan in the other passage causes air to be exhausted from inside the building to the outside. A flapper valve prevents entrance of air into the building through either passage when the fans are not operating. A series of media disks, two embodiments of which are disclosed, constitute successive stages, picking up heat and/or moisture from one passage and transferring the heat and/or moisture to the other passage as the disks are rotated within recesses formed in stationary separators. A special drive mechanism is utilized for rotating the disks. Provision is also made for spraying the disks in order to clean them and/or to control the humidity within the building.

Abstract: A self-contained heat recovery system for residential and commercial laundry dryers combines the principles of regenerative heat recovery with utilization of the dryer's existing drive apparatus to accomplish operation of the heat recovery system. The invention includes a rotary regenerative heat exchanger designed to permit planar adjustment of its surface; peripheral and airstream isolation seals to prevent loss of heat exchanger thermal effectiveness; apparatus for transmitting rotational forces from the laundry dryer tumbler to the rotary heat exchanger; cabinetry to function as a means of attaching the heat recovery system to the laundry dryer, as well as to provide airflow plenum chambers adjacent to the rotary heat exchanger to utilize existing airflow capabilities of the laundry dryer; cabinetry to further serve as structural support for rotary heat exchanger and its associated power transmission components.