Abstract: An especially compact, highly efficient heat recovery device for use in the cool air return duct of a heating system may be easily installed in existing flue pipes and transfers the ordinarily wasted heat in the exhaust gases flowing through the flue pipe to the cool return air thereby preheating the latter and increasing the efficiency of the heating system. The device includes a three stage heat transfer structure housed within a heat conductive tubular member which cooperate to transfer heat away from the gases into the cool return air by means of conduction, convection and radiation processes. A first stage deflects a portion of the gases toward and into heat exchanging contact with the sidewalls of the tubular member and directs the remaining portion into a gas pervious heat storage trap which comprises the second stage.

Abstract: A system is provided for use with a solar collector. The system includes a water storage tank having a heat exchange element mounted therein, the tank being connected to one or more solar collectors adapted to heat water circulated through a primary loop by associated pumps. A secondary water loop connects to a heat exchanger at a waste heat supply source such as a furnace flue, for example, and provides supplementary heat to the water circulating in the primary loop. The storage tank forms part of a primary heat exchanger, the function of which is to provide means for heating water flowing through a coil in the tank for local use. A booster heater connected to the hot water outlet of the coil provides additional heat to the water during periods of high demand and/or poor conditions for heating water with the collector or the waste heat source.

Abstract: Apparatus for providing more efficient use of heating and/or cooling sources as used within a building structure, particularly residential type buildings. In essence, this system utilizes a wood-burning fireplace in coactive conjunction with a standard form of building heater system, gas, oil or the like, and it functions to provide an integrated system having greater efficiency, and therefore greater fuel conservation. The fireplace includes a plurality of heat exchange chambers through which ambient air is pulled by the central system blower for subsequent recirculation through the heat register or release vents and, as temperature controls will dictate, central system heat may or may not be additive therewith. More efficient cooling is effected in like manner by coaction of a cooling system with the fireplace plenum chambers to provide a continual source of cooled air for contributive use with the central cooling system.

Abstract: A living apparatus comprises a first reservoir within the ground surface of circular form and having a quantity of water therein. A building having a roof and a peripheral side wall of circular form is concentrically nested and spaced within said reservoir. A convex hull is peripherally connected and sealed to the bottom of said building wall and immersed within the water and floatingly projected into said reservoir, a substantial portion of said building wall extending above said ground surface. A second reservoir within the ground surface is spaced from and below said first reservoir. A drain outlet is spaced above the bottom of said first reservoir; and a conduit interconnects said outlet and said second reservoir.

Abstract: A stove bench comprised of a metal liner forming an interior duct which is covered with tiles or masonry to form the outer face of the stove bench, an inlet to the duct for receiving hot exhaust gases from a stove or furnace, and an outlet from the duct for the exhaust of the gases to a chimney or the like. The bench has a top that is also covered with tiles, masonry, or soapstone, permitting heat conduction thereto, and permitting the top to serve as a seating or sleeping surface. The stove bench is preferably supported on two legs and has a clean-out door, preferably disposed at one end of the stove bench. A damper is disposed at the outlet from the structure for controlling the gases passed through the stove bench.In an alternate embodiment of the stove bench there is further included an insulated bypass duct disposed beneath the first, heat-conducting duct.

Abstract: The present invention provides a novel heat exchanger which is adaptable for attachment to an exhaust stack of either an oil or natural gas furnace and includes a heat exchange chamber with a plurality of separate, closely packed tubular conduits arranged to transport hot exhaust gases therethrough, a fan assembly which is attached to a side wall of the heat exchanger and is selectively actuable to force ambient air around the plurality of tubular conduits to heat the ambient air and thereby provide an additional heat source, and a thermostat extending into the ambient air passageway for monitoring the ambient air temperature and selectively actuating the fan assembly when the ambient air reaches a pre-set temperature.

Abstract: A furnace for burning biomass such as crop residues like cornstalks and other combustibles. The furnace includes a combustion chamber and many chimney stacks extending upwardly therefrom. Loading doors are provided into the combustion chamber to permit massive batches of combustibles to be deposited in the chamber. Centrifugal combustion air draft fans are positioned to deliver forced combustion air from the atmosphere into a lower part of the chamber when needed. A heat exchanger jacket encompasses major parts of the chamber and of the stacks and is provided with an upper opening adjacent the top of the stacks and a lower opening adjacent the bottom of the chamber. Drying air to be heated enters one of the openings and heated drying air discharges from the other. Fan means adjacent the lower opening moves the drying air through the heat exchange jacket and into a crop dryer or other location for use.

Abstract: An energy conserving device for preventing loss of heat energy from a heater to a chimney by means of a fluid gas heat trap to choke off either chimney draft and/or heated convectional air currents lost to the chimney when the heater is OFF but allowing combustion gasses to vent freely to the chimney when such gasses are generated. The device also acts as a diverter for either up or down drafts from the chimney to direct them away from the heater. In another form when the device is used with a forced air type furnace, the device in addition provides heat interchange between room air and the hot gasses in the trap. This then heated air is drawn into the circulating system of the furnace adding to its temperature while lowering the temperature of the vented combustion gasses, to lessen the heat loss up the chimney.

Abstract: A space heater with a heat recovery system in which the exhaust gases from the hot air furnace are passed through a heat exchanger in which a set of water heating coils is disposed. The set of coils is connected to a hot water holding tank which is in turn connected to a bank of heat exchanger coils in the heated air outlet of the furnace. A damper is provided in the exhaust pipe of the furnace and a pipe connects the exhaust pipe on the anterior side of the damper with the heat exchanger, and a pipe connects the chamber with the exhaust pipe on the posterior side of the damper. A pump is provided for circulating the water between the first set of coils and the holding tank, and a fan forces the air form the exhaust pipe through the chamber in the heat exchanger. The pump and fan are controlled by a switch responsive to the operation of the furnace. The holding tank may be used to heat water supplied to a hot water heater of a hot water supply system.

Abstract: A recuperator for recovering heat from hot exhaust gases flowing through a flue comprises inner and outer cylindrical walls coaxially surrounding a portion of the flue to which a plurality of fins are fixed, the fins extending longitudinally of the flue and being grouped such that fins spaced circumferentially around one section of the flue are angularly staggered with respect to fins spaced circumferentially around an adjacent section of the flue, the recuperator being arranged such that cold gas can be passed into, and is preheated as it flows along, an outer annular space between the said walls, the gas passing into an inner annular space containing the fins which cause turbulence and increase the heat-transfer by convection and radiation to the gas, and the heated gas being emitted through an outlet.

Abstract: An apparatus for extracting heat from the waste gases of a stove to heat the air in the room. The apparatus is mounted on the stove and includes a central chamber in which an inner core, having a plurality of passageways, is positioned. Waste gases from the stove enter the central chamber, pass through the passageways of the inner core so as to heat the air surrounding the inner core, and then exit from the central chamber. A removably mounted closure is mounted on the top end of the central chamber to enable cleaning of the insides of the passageways. A heat shield which extends below the bottom end of the central chamber so as to surround the back and sides of the stove is provided to protect adjacent walls from the heat radiated by the stove.

Abstract: A heated air circulator adapted to be placed against a radiant-type heating stove. The housing of the circulator, which defines a chamber therewithin, includes upright back and side walls which are unjoined along their adjacent upper edge portions. A plurality of spaced-apart, transverse fold lines on the back and side walls, where the same are unjoined, permit portions of these walls to be folded over to form a chamber top at a height conforming to the height of the stove. The circulator includes a damper regulated by a temperature-responsive spring whereby flow of unheated air into the chamber increases as the temperature within the chamber increases.

Abstract: This invention relates to an improved design associated with the fabrication and construction of a chimney stack capable of conveying hot gases generated in conjunction with industrial endeavors to a height within the atmosphere sufficient to meet current pollution standards, as well as providing a means to dampen stack vibrations plus incorporating a heat extracting system capable of providing a secondary source of heat for utilization outside of the stack confines. In accordance with the invention, there is incorporated within one overall design, a stack capable of conveying hot gases wherein there is provided means for selectively adjusting the opening appearing at the top of said stack, so as to maintain control over the gas velocity as well as plume rise of emitted gases.

Abstract: A heating system for a building having a conventional gas furnace which includes a combustion chamber for heating air passing from a cold-air return to a hot-air duct is disclosed. The gas furnace includes an exhaust stack for exhausting hot gases from the combustion chamber externally of the building. The heating system includes a heat pump comprising a housing having a condenser for heated air passing thereby from the cold-air return to the hot-air duct. The heat pump also includes an evaporator located externally of the building for drawing heat from the atmosphere. The heating system includes a conduit connecting the exhaust stack to the evaporator such that exhaust gases from the gas furnace combustion chamber will be directed pass the evaporator for permitting the recapture of stack heat for heating the building. The heating system includes a solar panel for heating air passed therethrough and a circuit for using the solar warmed air to warm the ambient air at the evaporator.

Abstract: A solid fuel burning system which may be readily combined with a conventional fluid fuel burning furnace in a forced air heating system. The solid fuel burning system comprises, in combination, a draft inducing blower which directs air for combustion into the furnace at a point proximate the burning fuel. Baffle walls are provided which separate the smoke and other products of combustion from the clean air to be heated and a novel heat exchanger comprised of a plurality of elongated tubes provide a relatively large heat transfer surface. The furnace is specifically designed to facilitate periodic cleaning of the interior walls of the heat exchanger where creosote and other products of combustion may accumulate. In addition, the system employs a novel electronic control circuit which is tied in with the room thermostat and with a thermocouple disposed within the solid fuel burning furnace.

Abstract: A wood burning stove, a free standing fireplace or fireplace insert is constructed to receive one of three possible types of inserts to make the unit adaptable to a convection, hot air or hot water heating system. The wood or like fuel combustion rate is automatically controlled by a temperature sensor and draft control system. The insert may be a baffle structure, an air to air heat exchanger or an air to water heat exchanger.

Abstract: In a home heating system having a furnace with a combustion chamber for burning fuel and creating heat, and a chimney with a draft therein, an improvement comprising, an exhaust flue connected between the combustion chamber and the chimney for venting heated exhaust products from the furnace, a heat reclaimer connected into the exhaust flue between the combustion chamber and the chimney for reclaiming heat from the heated exhaust product, and an outside air line for supplying air from the outside of the house to the combustion chamber. A first flue portion of the exhaust flue is connected between the combustion chamber and the heat reclaimer, and a second insulated flue portion of the exhaust flue is connected between the heat reclaimer and the chimney. An outside air by-pass or balancing line is connected between the outside air line and the chimney for satisfying the chimney suction at flame-out.

Abstract: A heat transfer device for transferring excessive waste heat from the upper portion of a fireplace to the room comprising a high temperature heat exchanger positioned above the fire grate between the fire and the flue of the fireplace. A mass transfer tube communicates between the heat exchanger and the low temperature heat exchanger positioned above the lintel on the fireplace. A heat transfer fluid is secured within the hollow high temperature heat exchanger such as trichloromonofluoromethane such that as the fluid boils, the heat of the fire the liquid turns to a gas and moves through the mass transfer tube to low temperature exchanger. The fluid cools and gives up its heat to the low temperature exchanger which in turn gives up the heat to ambient air. As the fluid cools, it becomes a liquid again and flows back down the transfer tube from which it came to the high temperature exchanger.

Abstract: A water heating and forced air heating system that provides potable hot water and that also provides heated air for heating enclosed spaces within buildings, including: a water heater including a water tank filled with water, a burner for heating the water in the tank, and an exhaust flue for removing hot gases generated by the burner; a gas-to-liquid heat exchange unit disposed within the flue; a forced air heater having a casing that defines a chamber, a liquid-to-gas heat exchange unit disposed within the chamber, a gas-to-gas heat exchange unit also disposed within the chamber, and a blower for pulling fresh air into the chamber and blowing it past the heat exchange units to absorb heat; a pump for pumping water through the gas-to-liquid heat exchange unit so that the water becomes heated by the hot gases within the flue; another pump for pumping heated water through the liquid-to-gas heat exchange unit to heat the air flowing within the chamber; and a conduit for connecting the terminal end of the flue t

Abstract: A method for constructing structures to minimize the amount of fuel necessary to heat the structure during winter months as disclosed. The structure of this invention maximizes the heat obtainable from the earth at depths substantially below the frostline by providing a basement having a relatively thin floor of conducting or noninsulating material and walls with a maximum of reasonable insulation both in the basement level and in the living-level first floor of the structure. Grids are provided adjacent walls and below windows and doors at the first floor level whereby cold air within the house will drop to the basement. The external walls are of standard construction with maximum insulation to protect against heat loss from within the structure. The basement floor adjacent the walls may be insulated if desired.

Abstract: An especially compact, highly efficient heat recovery device for use in the cool air return duct of a heating system may be easily installed in existing flue pipes and transfers the ordinarily wasted heat in the exhaust gases flowing through the flue pipe to the cool return air thereby preheating the latter and increasing the efficiency of the heating system. The device includes a three stage heat transfer structure housed within a heat conductive tubular member which cooperate to transfer heat away from the gases into the cool return air by means of conduction, convection and radiation processes. A first stage deflects a portion of the gases toward and into heat exchanging contact with the sidewalls of the tubular member and directs the remaining portion into a gas pervious heat storage trap which comprises the second stage.

Abstract: A stack-type heat exchanger having a complementary fan section in attached communication with a heat exchanger tube section, the fan section forcing incoming air through heat exchanger tubes having a damper plate at or adjacent their output ends to generate a positive air pressure in the tubes at a value above and in excess of the pressure of vented stack gases passing through the heat exchanger tube section chamber from and to lower and upper portions of said stack.

Abstract: A fuel-burning forced-air-circulating heating system having a thermostatically controlled heavy-duty blower, and a constantly operating or thermostatically controlled relatively low-powered supplemental air-circulating attachment for forcing air from the cold-air-return plenum to the hot-air-feed plenum of a conventional hot-air furnace. The supplemental attachment bypasses the furnace so that the air-flow resistance of the air filter of the furnace minimizes reverses air-flow through the furnace, resulting in a gentle temperature-equalizing (anti-stratification) circulation of air through the rooms being heated. Preferably, a thermostatic switch located close to a floor energizes the supplemental blower when needed to reduce temperature stratification in the heated space. Alternatively, or in addition, an outdoor thermostat can energize the supplemental blower in colder weather (when its operation is most needed).

Abstract: The invention is comprised of a heat exchanger around the exhaust stack of any combustible fuel-burning system and also around the outside of any fuel-burning device; each heat exchanger filled with a porous heat-conducting material so that fresh outside air pulled by motor-powered means into any building operates to replace the cold air therein with fresh warm air pre-heated from the combustion device and stack.

Abstract: A self-cleaning heat exchanger in combination with a home furnace system which draws combustion air from outside the home is disclosed. Gases of combustion are drawn up through a plurality of vertical tubes and out a chimney by a fan mounted in the chimney. The lower portions of the tubes are cooled by inside air drawn over them by the return air blower of the furnace, the upper portions of the tubes are cooled by cold outside air drawn across them by the furnace burner unit. Moisture which condenses in the upper portions of the tubes is drawn down through them by gravity. The higher temperature in the lower part of the tubes causes this condensate to revaporize and rise to the upper portion of the tubes, where the process repeats itself. As more water vapor enters the tubes in the flue gas, distilled condensate eventually drops out of the tubes and runs into a drain at the lower end of the heat exchanger.

Abstract: A heat exchange recuperator comprising a box-like housing having inlets and outlets for heating gases and gases to be heated, respectively, connecting plates mounted on a lower and an upper walls of said housing, and a plurality of hollow metallic plates disposed in spaced relation sandwiched by said connecting plates. The heating gases are adapted to pass through the spaces between said hollow plates and the gases to be heated are adapted to pass through said hollow plates. A plurality of generally U-shaped heat-resisting cover plates are detachably mounted on the upstream ends, with respect to the heating gases, of said each hollow plates, respectively, with defining spaces between the upstream ends of said hollow plates and inner walls of said cover plates.

Abstract: A secondary heat exchanger is connected in the flow path of exhaust gases passing from the exhaust expansion chamber to the flue gas outlet of a pulse combustion system, so as to be heated by the hot exhaust gases flowing therein, and air to be heated is first passed over the exterior of the secondary heat exchanger and then over the exterior of the combustion chamber. The temperature at the outlet end of the secondary heat exchanger is below the condensation point of exhaust gases therein, and the temperature at the inlet end of the secondary heat exchanger is sufficiently low to permit use of a wider range of materials for the secondary heat exchanger. The secondary heat exchanger is made of a material of high thermal conductivity which is corrosion resistant, and increases the thermal efficiency of the system greatly while exerting a muffling action to reduce the noise in the system.

Abstract: A chimney, waste-heat, collector includes a plurality of elongated sections, coupled end-to-end and lowerable successively down a chimney. The collector comprises at least one vertical, up-flow, conduit and at least one down-flow conduit within the chimney forming a closed loop system with a pair of horizontal conduits extending out the ash pit opening to a heat storage and dissemination means. The couplings are threaded unions for ready assembly and the sections are preferably of right angular, or rectangular cross section and of thin wall stainless steel. A pump circulates liquid around the loop when the furnace is operated.

Abstract: Apparatus for the processing of solid fuel hydrocarbons including a reactor for hydrogenation of the fuel reactant and a combustion reactor for oxidation of the residuum from the first reactor, the solid fuel reactant being dissolved in molten salt throughout its processing; and heat recovery means including a molten metal loop and a steam loop whereby the excess heat from the hydrogenation and oxidation reactors, present in the molten salt reaction matrix, is recovered in molten metal and transferred to the steam loop for energy production while avoiding cross contamination of the steam loop with salt from the reaction loop, and vice-versa.

Abstract: A heating vent is disclosed in which a T-shaped housing of light weight sheet metal is inserted in the plastic vent hose of an electric clothes dryer to provide passages through which the dryer is vented either outdoors through the vent hose or indoors through a sock-like filter having its open end stretched over the lateral outlet of the housing according to whether a pivoted valve member in the housing is in its summer or winter position.

Abstract: A space heater utilizes a source of waste heat such as hot gas passing through a metal conduit. A portion of the length of the metal conduit is surrounded by a sealed insulated enclosure. Within the enclosure, the metal tube is exposed and has heat exchange fins thereon. A circulating fan in the enclosure blows the air in the enclosure across the cold end of a closed circuit expansion-compression refrigeration system whose hot end is outside the enclosure. A fan blows air across the hot end of the refrigeration system to heat the ambient space.

Abstract: A heat exchanger for flue gas in which water tubes are inserted through the flue wall into the flue from the exterior thereof so as to be adjustable in the depth of insertion. Each of the water tubes has a structure comprising an inner water feed tube and an outer recovering tube for recovery of the waste heat by returning the water from the water feed tube to generate steam by heat transferring from the waste gas passing through the flue. Headers are provided at each exterior top of the feed water tubes and recovering tubes and are connected respectively to a water-steam drum through movable connecting tubes. The headers are movable in co-operation with driving means provided at the exterior of the flue so as to adjust the heating surface of the water tubes inserted into the flue by the action of the driving means.

Abstract: A heat-saving attachment in the nature of a jacket surrounding the smoke pipe of a furnace located in a basement or other relatively unheated space. Air is drawn from the unheated space or other area into the annular space between the jacket and smoke pipe, absorbing heat from the exterior of the pipe as it is directed through laterally disposed baffle means within the annular space from whence it is directed through a warm air duct to a space to be heated. Electrical controls may be provided to establish predetermined time delays between turning on and off of the furnace burner and respective on and off controls of an intake fan for drawing air from the unheated space into the jacket.

Abstract: A fireplace heat exchange system is disclosed which is connectable to an existing forced air heating system of a building. The heat exchange unit includes a housing or enclosure within which is disposed a firebox. The enclosure and the firebox define a heat exchange space. The firebox includes a front opening which is closed by doors. A plenum is positioned on top of the firebox for collecting combustion gases. A plurality of heat exchange fins are secured to the exterior of the firebox within the heat exchange space to channel the incoming air entering the housing around and over the firebox and to increase the efficiency and rate of heat exchange. An air control device is positioned adjacent the front of the firebox to control the amount of combustion air entering the firebox. A chimney connects to the plenum and a chimney damper limits the combustion gas flowing out the chimney.

Abstract: An automatically controlled residential heating system based on the heat from a fireplace comprising the normal fireplace, hearth, combustion zone, flue, and damper; the flue being divided into two parallel flue passages one of which is unobstructed and the other of which contains a heat exchanger adapted to absorb the heat from the flue gases into a fluid passing through the heat exchanger and then into space heating elements in the residence; the system including automatic devices for sensing the temperature in the heat exchanger and the temperature in the residential spaces to be heated, an automatic control to act upon the temperature sensing means and to move a diverter which serves to pass the flue gases into either or both of the parallel flue passages in any desired proportion, an automatic relief valve means for relieving excessive temperature build-up in the heat exchanger, and an automatic extinguishing device for extinguishing the burning material in the fireplace if the means for sensing the temp

Abstract: A heating system including a fireplace and a flue for carrying away combustion products, door means being provided to prevent a draft through the space to be heated and to oxygen-starve a fire in the fireplace; and, heat exchanger means is mounted in the flue, the heat exchanger means comprising a plurality of coils for carrying a heat exchange medium, the coils being connected in parallel with one another on manifolds that extend through the coils.

Abstract: A heating system for a building having a conventional gas furnace which includes a combustion chamber for heating air passing from a cold-air return to a hot-air duct. The gas furnace includes an exhaust stack for exhausting hot gases from the combustion chamber externally of the building. The heating system includes a heat pump comprising a housing having a condenser for heating air passing thereby from the cold-air return to the hot-air duct. The heat pump also includes an evaporator located externally of the building for drawing heat from the atmosphere. The heating system includes a conduit connecting the exhaust stack to the evaporator such that exhaust gases from the gas furnace combustion chamber will be directed past the evaporator for permitting the recapture of lost heat for heating the building.

Abstract: In connection with a furnace having a forced air recirculation system driven by a blower, and an atmospheric flue for its combustion chamber, a heat exchanger housing surrounding the flue to extract heat therefrom, the furnace blower drawing atmospheric air through the heat exchanger housing into the recirculating air system in proportions controlled either manually or automatically.

Abstract: A fireplace heating and cooling system is disclosed which heats air in a forced air heating system and heats water for a circulating hot water heating system or for hot tap water when combustion occurs in the fireplace and alternately will cool the air in a central, forced air system by circulating water cooled by a heat sink, through heat exchangers. A water reservoir is mounted on top of a fireplace firebox, having a central passage formed therethrough communicating with the throat of the firebox for absorbing heat from the combustion gases to heat water stored in the reservoir. A valve means selectively connects the water reservoir to a pressurized water supply, with an outlet to a circulating hot water heating system or to hot water taps. An air plenum is formed around the reservoir for circulating air from the ambient, across the reservoir to transfer heat between the water and the air.

Abstract: A heat exchanger heats fresh air moving to a product dryer by running the fresh air around hot exhaust tubes which are discharging from the dryer. Detergent sprays may be positioned to direct cleaning fluid into the tubes. The fresh air is introduced into a pre-dryer through pipes having nozzles which are at 30.degree. angles to the product path.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. The source of waste energy, including heat, is normally a grease extraction ventilator mounted to receive fumes and heated air from cooking equipment. Any other source of waste energy is normally suitable, such as heated air which has risen to the upper portion of a large room or enclosure, such as an auditorium, theater, meeting hall or the like. The heated air removed from such a position is adapted in part to be recirculated, but all of it may be used to furnish heat for heating fresh makeup air. Several forms of chiller, including specialized double compartment chillers, are disclosed.

Abstract: A gaseous source of waste energy, including heat, is passed through a gas to liquid heat exchanger and then a chiller to agitate a water bath and produce evaporation of water for cooling. The heated transfer liquid is passed through a heat exchanger to heat makeup air or the like, while, alternatively, chilled water from the chiller is passed through the heat exchanger to cool the makeup air. Supplemental heating, as by a furnace, or supplemental cooling, as by refrigeration, may be utilized when called for.Separate heat exchangers, as for separate areas, are alternatively supplied with heated transfer liquid or chilled water, or one or more supplied with heated transfer liquid and one or more others supplied with chilled water.The source of waste energy, including heat, is normally fumes and heated air from cooking equipment passed through a grease extraction ventilator.

Abstract: A heat retriever having a shell provided with an inlet and an outlet for permitting a fluid to be circulated through the shell and heated by a retriever assembly including a vent pipe attachable to a flue pipe of a furnace. At least one, and preferably a plurality of retriever pipes are connected in parallel to the vent pipe within the shell for forming a bypass around a portion of the vent pipe of exhaust gas from the associated furnace flue pipe and exposing the fluid to be heated to a larger heat transfer surface. A blower is advantageously mounted on the inlet of the shell in order to provide a flow of forced air over the retriever pipes.

Abstract: A high energy saving heat exchanger is provided for the hot exhaust gases of a furnace which has a combustion chamber, a burner with electrical controls, a furnace heat exchanger and an exhaust pipe adapted for connection with a stack. The high energy saving heat exchanger includes a housing having an air chamber with an exhaust inlet connected to said furnace exhaust pipe and an exhaust outlet. An exhaust conduit interconnects said housing exhaust outlet and stack. A continuous circuitous tubing is nested within the air chamber of said housing at one end connected to said exhaust inlet and at its other end connected to said exhaust outlet. An exhaust fan is interposed in said exhaust conduit for drawing exhaust gases through said heat exchanger tubing and delivering said gases under pressure to said stack. A hot air duct is interposed between said housing and a floor surface defining an area to be heated and including a hot air register. Heat duct communicates with said air chamber.

Abstract: A system for lowering the temperature of a room where a substantial amount of waste heat is generated, and utilizing the waste heat removed from the room, includes a portion mounted within the room to absorb the heat from the room and a portion external to the room, operable to utilize the heat.The portion mounted in the room includes at least one heat exchanger along with associated means for moving the hot air of the room through the heat exchanger and means for conducting fluid through the heat exchanger and to the external portion of the system.

Abstract: An automatically controlled residential heating system based on the heat from a fireplace comprising the normal fireplace, hearth, combustion zone, flue, and damper; the flue being divided into two parallel flue passages one of which is unobstructed and the other of which contains a heat exchanger adapted to absorb the heat from the flue gases into air passing through the heat exchanger and then into space heating elements in the residence; the system including automatic devices for sensing the temperature in the residential spaces to be heated, an automatic control to act upon the temperature sensing means and to move a diverter which serves to pass the flue gases into either or both of the parallel flue passages in any desired proportion and an automatic control for an air blower to circulate the hot air leaving the heat exchanger.

Abstract: The invention is a heat conserving space heater that includes a heat source for providing a supply of hot gas of which an example is a gas fired unit heater, air passages in the heater with means for drawing air from the space and exhausting it into the space and when passing through the heater being in heat exchange relationship with the hot gas passages in the heater and an auxiliary heat conserving heat exchanger downstream from the hot gas and air passages and having auxiliary hot gas passages and auxiliary air passages in heat exchange relationship with each other and means in the auxiliary heat exchanger for forcing the hot gas in series through the hot gas passages of the unit heater and through the auxiliary hot gas passages and from there to a place of disposal.

Abstract: A heat exchanger with a tubular body having helical ribs about its periphery constituting expanded interior and exterior conductive heating surfaces. A clamp is captively held to the tubular body for mounting the heat exchanger to the exhaust duct of a freestanding heating unit. Hot gases passing through the exhaust duct conductively heat is the expanded surface of the tubular body and air therein. A thermostatically controlled blower directs the heated air within the tubular body towards a heated surface of the freestanding heating unit for convectively heating the area about the unit.

Abstract: This invention is a device for use in increasing the efficiency of existing heating units. This heat exchanger consists of conduits for channeling the furnace or wood stove exhausts in an extended pattern. Cold air is pumped into the heat exchanger at a point at which the exhaust smoke is released up the chimney. The cold air is channeled around the smoke containing flues by a thermostatically-controlled fan and baffles found in the heat exchanger. This air exits the heat exchanger at a point at which the smoke enters it. This heat exchanger puts out temperatures in excess of 450.degree. F. As depicted in the preferred embodiment, only by way of example, the heat exchanger is extremely lightweight and made of galvanized steel with caps at either end to facilitate cleaning.

Abstract: A fluid heat exchanger comprising an exterior duct and an interior duct extending longitudinally and centrally through said exterior duct, each duct having an entry end port and exit end port. The interior duct comprises a lower wall, an upper wall and two opposed sidewalls extending generally perpendicularly therebetween, and a partition having exposed corrugated surfaces centrally disposed between and extending generally parallel to the sidewalls. The corrugations of the exposed surfaces extend generally transversely of the interior duct. The exterior duct has a lower wall, an upper wall, and two opposed sidewalls extending generally perpendicularly therebetween. The sidewalls of the exterior duct extend generally parallel to the sidewalls of the interior duct and have inwardly facing corrugated surfaces. The corrugations of the sidewalls extend generally transversely of the exterior duct.