Abstract: A housing for an outdoor gas fired construction heater that incorporates a one-piece shell design that sits on and mounts directly to the base. Openings are used in the sides near the top and the bottom of the shell to provide the burner system with a metered amount of inlet air. Integrally formed, inwardly and downwardly projecting panels protect the burner system from debris, drafts at floor level, and to shield the floor on which the burner sits from infrared energy. In order to increase the strength of the top and shell assembly, the top sits on and is directly mounted to the shell. The shell height and top openings are of a size to allow heat out but to prevent drafts from pulling the flame out of the top of the heater.

Abstract: A process and apparatus for combustion of a gaseous fuel in a fireplace in which a plurality of periodic vortices are created in the airflow pattern of the combustion air prior to its mixing with the gaseous fuel, thereby producing a more natural looking, flickering flame.

Abstract: A compact heat exchanger for a fuel-fired heating furnace. The heat exchanger has a radiative heat transfer section including at least one firetube for containing flue gases as the air to be heated passes over the firetube and a convective section including a shell-and-tube heat transfer apparatus arranged to receive flue gases from the firetube in the shell region and the air to be heated after it passes over the firetube in the tubes.

Abstract: A heat-absorbing/heating device with high efficiency and a supporting device thereof, wherein a plurality of spaced heat-absorbing members are disposed on a heat-absorbing surface of the heat-absorbing/heating device and a plurality of space heating members are disposed on a heating surface thereof, and a heat-surrounding member with heat-guiding members is disposed around the heat-absorbing members whereby when heating the heat-absorbing members, the heat-absorbing members can rapidly absorb and collect the heat at high efficiency and conduct the heat to the heating members for further heating the liquid or food contained in the heating-absorbing/heating device, and wherein the supporting device includes a large support portion and a small support portion corresponding to the heat-absorbing/heating device whereby when heating, the heat-absorbing/heating device can be placed on the supporting device.

Abstract: A hot-air furnace has a long-flame burner for combusting gas or liquid fuel with a combustion chamber connected to the burner and having its length (l) and width (w.sub.1) in relationship of w.sub.1 <l. A heat exchanger is located above the combustion chamber and has internally a gas flow guide plate which guides combustion gas flow discharged from the combustion chamber to the heat exchanger. The heat exchanger has a width (w.sub.2) and length (l) in the relationship of w.sub.2 <l. An exhaust port for exhausting the combustion gas flow is located at the front or rear of, right or left-hand side of or on the top side above said heat exchanger. A casing has a drum integrally connecting the combustion chamber and the heat exchanger, an air flow guide and directing plate which covers the drum, a radiant heat absorber plate outside the combustion chamber, and a blower above or below the drum.

Abstract: An exhaust hood for a pizza oven which induces exhaust materials into the exhaust stream by creating high velocity flow of outside air in the hood. An intake fan forces outside air into a pair of intake plenums located along opposite sides of the hood. Each intake plenum presents an elongate outlet slot, thus creating two high velocity air streams flowing toward one another in opposite directions. A central exhaust plenum in the hood receives the air and the entrained exhaust materials from the oven. An exhaust fan draws air into the exhaust plenum through inclined grease filters.

Abstract: An improved gas-fired heater for supplying heat to a space, such as a vehicle cab, and simultaneously, heat to the engine block for running the vehicle. A heat exchanger simultaneously heats a coolant which supplies heat to the engine block, and air to the vehicle cab.

Abstract: The present invention in its most simple form or embodiment is directed to a heat exchanger which provides for at least two heat exchange surfaces. The two heat exchange surfaces are defined by an inner wall or inner shell which separates a combustion region or combustion passage and at least one fluid passage defined by the inner shell, and an outer wall or outer shell. The space defined between the inner and outer shells being the combustion region or combustion passage. The combustion chamber is configured to provide for full and efficient fuel combustion without any flat surfaces upon which a flame of combustion could impinge. Because of the nature of the construction, the flame forms into a fan configuration allowing thorough mixture with the combustion air and thus providing for complete and efficient combustion.

Abstract: A compact forced air heater comprises a combustion chamber mounted in a housing, a burner module mounted across a back open end of the combustion chamber adjacent a back wall of the housing for producing heated air in the combustion chamber, an air intake in a front wall of the housing, and a high speed (3000 rpm) forced air blower mounted between the combustion chamber and the housing front end wall. The burner module includes a flameholder plate having a central primary air hole and circular rows of staggered secondary air holes surrounding the primary air hole. A flamespreader plate is mounted on the flameholder plate opposite the primary air hole, and an elongated right-angle burner tube, having a flattened locating-and-orienting end and at least one burner orifice in a sidewall of the tube, is located on an opposite side of the flameholder plate with the burner orifice aligned with the primary air hole and the flamespreader plate. An ignitor and a thermocouple are also mounted on the flameholder plate.

Abstract: This invention provides improved gas-fired heater means for supplying heat to a space, such as a room, house, building, vehicle, or the like.

Abstract: A compact, high efficiency hot air furnace including a heat exchanger assembly located in a heat exchange chamber through which comfort air is passed to be heated. The heat exchanger assembly includes a drum-like combustion member located such that its axis extends across the flow path of comfort air. A supplementary heat exchanger or condenser is located a spaced distance from the combustion member and is disposed in the comfort air flow path upstream from the combustion member. A transfer channel extends from one end of a cylindrical wall forming part of the combustion member and communicates combustion by-products to the condenser. Heat exchange fins are mounted to the cylindrical wall of the combustion member and along a wall of the transfer member. A diffuser located within the combustion member is cup-shaped and includes a wall portion positioned between a burner and a transfer channel opening which prevents the burner flame from extending into the transfer channel.

Abstract: A total counterflow heat exchanger comprising a system of partitions dividing an interior chamber into a series of channels which coincide with the path of a duct through that interior chamber. A substance at one temperature is passed through the duct, and a substance at a second temperature is passed through the channels, thereby creating a temperature differential gradient over which thermal energy is transfered from one substance to the other as the substances flow through the heat exchanger. The arrangement of the partitions permits a substance to pass back and forth through the channels in the heat exchanger along the same path as the duct, so that while the substance may flow through the heat exchanger at the same net rate as if the partitions were not present, the length of the heat exchange gradient may be increased many times, therefore enhancing the efficiency of the gradient and the heat exchanger.

Abstract: A forced air heater (10) includes a removable burner module (26) in which all of the burner components are mounted on a common support plate (42) to facilitate mounting of the burner module in the heater and removal of the burner module from the heater for servicing. An elongated burner tube (46) has a closed flattened end (50) receivable in a location-and-orienting bracket (76) to locate a single burner orifice (52) in a sidewall of the tube in proper position with respect to a pancake flame-spreader plate (78). A gas valve (44) and ignition device (58) also form part of the burner module 26. A combustion chamber (24) is of essentially box-shaped construction, with one open end (36), and includes an inclined baffle plate (40) which enhances mixing of combustion products and intake air in the chamber. A forced air blower (28) is mounted adjacent a heated air discharge opening (36b) of the combustion chamber (24).

Abstract: A maximum efficiency stove or furnace for heating homes or other buildings is disclosed. The furnace includes a combustion chamber supported within a furnace housing by an ash pan. The combustion chamber is spaced apart from the furnace housing to define an air circulation chamber therebetween. A horizontal flue extends through the upper portion of the air circulation chamber, from the rear of the combustion chamber to the front of the top wall of the furnace housing. The ash pan includes a number of heat transfer tubes projecting therethrough to define a grate upon which the fuel is burned and a secondary grate below the heat transfer tubes. The furnace also includes an ambient air preheating chamber attached to the outside surface of the housing. The air to be heated is drawn through the preheating chamber and admitted into the air circulation chamber, whereupon it flows through the heat transfer tubes, around the combustion chamber and flue, and is then exhausted into the room to be heated.

Abstract: The invention relates to furnaces equipped with an insulating inner lining formed from fibers. The object of the invention is to reduce the thermal discontinuities at the level of the orifice tube of the burner. For this purpose, the orifice tube consists of blankets of fibers arranged radially round the burner and compressed to a greater extent in the inner part facing the axis of the burner than in the outer part. The density in the inner part preferably reaches 300 to 400 kg/m.sup.3.

Abstract: Disclosed is a dwelling furnace having at least one clam-shell type primary heat exchanger in parallel orientation with a secondary heat exchanger, both the primary and secondary heat exchangers being vertically oriented relative to a furnace housing and parallel to the flow of air to be heated. The primary heat exchanger has a combustion chamber in the lower end thereof, and the lower end of the secondary heat exchanger exhausts into a tertiary heat exchanger oriented approximately perpendicular to the primary and secondary heat exchangers and horizontally relative to the housing, below the combustion chambers of the primary heat exchangers and below the exhaust outlet of the secondary heat exchanger. The tertiary heat exchanger includes a plurality of condensation tubes for retrieving the latent heat of condensation of the combustion gases.

Abstract: A secondary heat exchanger is positioned within a cold air return plenum of a forced air gas or oil fired furnace to preheat cold air drawn into the furnace through the cold air plenum. A heat recovery flue pipe is connected between a primary flue pipe of the furnace and the secondary heat exchanger, and an exhaust pipe is connected between the secondary heat exchanger and the outside of a structure served by the furnace. A secondary blower coupled to the exhaust pipe draws hot combustion gases from the primary flue pipe through the heat exchanger and exhausts cooled combustion gases to the outside. The secondary heat exchanger comprises a combustion gas inlet plenum and a combustion gas outlet plenum, with a plurality of heat conducting pipes sealingly connected therebetween.

Abstract: This invention relates to a compact high efficiency furnace having a cylindrical combustion chamber and a fin and tube type heat exchanger substantially parallel, transverse to the furnace air flow, and closely spaced in the air flow direction with no other major heat exchange being utilized. Condensation of fluids from the combustion gases occurs at the fin and tube type heat exchanger, whereby a high efficiency furnace results. The fins and tubes of the heat exchanger are of different materials, requiring that the combustion gas temperature at the heat exchanger inlet be limited.

Abstract: Hot gases from a fuel burner in a combustion chamber are exhausted to a flue at the top of the furnace. Air to be heated is drawn into the furnace through an upper inlet, passes through a chamber around combustion gas flow tubes, and then downwardly through sidewall flow spaces along the outside of the combustion chamber. Partially heated air from the sidewall spaces flows to one end of the furnace and then through air tubes above the burner to a plenum at the other end of the furnace where the so heated air is withdrawn by a fan. The fuel can be a solid fuel such as lignite, and the heated air can be used for grain drying.

Abstract: A heat saving device is provided for use in connection with the flue pipe of a stove, furnace, or similar heater. Instead of being exhausted directly into the atmosphere through the flue pipe, hot exhaust gases and other combustion products pass through a heat transfer chamber. An open-ended tube forms the inside wall of the chamber so that heat from the gases and other combustion products passing through the chamber is transferred to the useful air flowing through the tube. A removable shroud open at one end and baffled at the other partially surrounds the outer wall of the heat transfer chamber in spaced relationship to the outer wall, permitting flow of useful air through the space thus formed. The useful air flowing through this space is preheated by heat transferred through the outer wall and subsequently entrained by and mixed with air being blown through the inner tube by a fan.

Abstract: A warm air blowing heater includes combustion equipment for burning fuel, and an air duct provided at a position away from a portion directly above the combustion equipment for blowing air from the heater into the room. The combustion equipment includes a burner chimney provided above a burner, and a reflecting plate is provided behind this burner chimney. The radiation heat of the combustion equipment is radiated directly and is also reflected on the reflecting plate to heat the room. The air duct does not disturb the rise of the combustion exhaust gas of the combustion equipment to form a smooth rising exhaust gas stream. When the air is blown from the air duct toward the front of the heater, the high temperature air in the upper portion of the heater is sucked. This high temperature air is mixed with the air blown from the air duct to allow the heater to blow warm air into the room. The blower motor may suck the air in the room and supply it to the air duct.

Abstract: A freestanding stove is provided including an elevated firebox mounted atop a tubular pedestal having a horizontally enlarged downwardly opening hollow base at its lower end. The firebox includes a combustion air inlet opening downwardly into the pedestal and the lower end of the pedestal opens downwardly into the hollow base which includes a damper for controlling the flow of combustion air from within the hollow base into the lower end of the pedestal. The base includes feet supporting the base a spaced distance above a horizontal surface upon which the feet rest and the feet are removable whereby the base may rest directly upon and over a horizontal support surface upwardly through which a combustion air opening is formed. The front of the firebox includes an openable transparent window equipped door and combustion air inlet passage structure for sweeping curtains of combustion air across the inner surface of the window from selected marginal portions thereof.

Abstract: This disclosure is directed to a heat exchanger which includes a coil through which a heat exchange medium, such as Freon, is circulated between an inlet and an outlet, the coil defining an interior chamber having a lower chamber portion, means for generating a flame, such as a natural gas burner at a lower end portion of the coil whereby heat is introduced into the interior chamber and rises upwardly therein such that the same might be absorbed by the heat exchange medium for subsequent utilization, a pair of baffle plates disposed within the interior chamber in generally upwardly opening diverging relationship for directing heat generally outwardly toward the coil for substantially total absorption thereof by the heat exchanger medium, and a fan for drawing a limited amount of air from the exterior of the coil to create a negative pressure for assuring air flow from the interior chamber to the exterior thereof through the coil.

Abstract: Heater apparatus is disclosed having a metal firebox in which fuel is burned and an outer ceramic enclosure having ceramic mass walls which absorb excess heat when the heater produces more heat than is required and distributes the heat gradually by radiation after the heater output becomes less than the heat stored in the ceramic mass. The ceramic mass walls are spaced from the metal firebox walls to provide air passages through which air may be circulated by means of a blower so that rapid heating may be had of the interior space when the firebox is initially fired by transferring the heat radiated from the metal walls directly into the room by forced convection. After the interior space is heated to a desired temperature, the blower may be cut off and the room may be heated more slowly at a more even temperature by radiation from the ceramic mass.

Abstract: A heat exchanger furnace includes a firebox, a heat exchanger housing in communication with the firebox for receiving combustion gases therefrom, and a plenum housing surrounding the heat exchanger housing so as to define a plenum chamber therebetween. A plurality of baffles are supported in vertically spaced apart relation within the heat exchanger housing, which baffles include peripheral edges disposed in clearance relation from the housing sidewalls whereby hot combustion gases rising within the heat exchanger housing are directed outwardly adjacent the heat exchanger sidewall for increased heat transfer to the plenum chamber. Exhaust tubes at the top of the heat exchanger housing may be directed through the plenum chamber for providing additional heat transfer surfaces therein. The firebox may have a frusto conical shaped sidewall whereby the combustion surface area may be adjusted with the level of fuel in the firebox.

Abstract: A safe, practical and inexpensive method for saving heat units on modern forced warm air heating furnaces, this method employs a heat exchanger designed by the furnace manufacturer to fit each different size and type of their models. The heat exchanger is interposed directly on the furnace heat exchanger outlet and on through the piping to the flue or chimney. Air circulation through the heat exchanger is provided by the furnace blower by directing air from the warm air supply plenum, with its positive pressure, through the heat exchanger and terminating in separate supply run with a high volume of air which requires no external power to accomplish it. The heat exchanger will be provided with test openings for thermometer readings at the inlet and outlet of flue gas travel through the exchanger. A manual damper may be locked into proper position to restrict air circulation flow if necessary to maintain proper flue gas exit temperature.

Abstract: A furnace for firing with optional fuels and where the substantial heat transfer takes place from air to air, whereby the furnace (1) is provided with double shells, which in the space therebetween present partition members (10) which subdivide the space in at least two zones (2,3) through which air is forced by at least one blower (6) from an inlet at one end of the furnace, via a first one of said zones and thereupon via the second one of said zones to an outlet (5) at the same one end of the furnace, whereby the air is brought carefully to flow around the combustion chamber shell.

Abstract: A coal-burning boiler wherein primary air is admitted in the boiler front, below the grate, and secondary air is admitted in the rear of the boiler, below a box-like baffle member. The baffle member is disposed parallel to the grate and divides the boiler into upper and lower chambers communicating adjacent the boiler front, whereby the streams of primary and secondary air merge to flow over both the lower and upper surfaces of the baffle prior to exiting the boiler by way of a stack at the rear thereof. Secondary combustion thus occurs along the lower or under surface of the baffle member. The baffle is subdivided by parallel, longitudinally extending members so as to define a single, continuous fluid flow channel, whereby water may be efficiently heated by passage therethrough. The boiler is formed of upper and lower halves bolted together along mating peripheral flanges.

Abstract: A heat exchanger furnace includes a firebox, a heat exchanger housing in communication with the firebox for receiving combustion gases therefrom, and a plenum housing surrounding the heat exchanger housing so as to define a plenum chamber therebetween. A plurality of baffles are supported in vertically spaced apart relation within the heat exchanger housing, which baffles include peripheral edges disposed in clearance relation from the housing sidewalls whereby hot combustion gases rising within the heat exchanger housing are directed outwardly adjacent the heat exchanger sidewall for increased heat transfer to the plenum chamber. Exhaust tubes at the top of the heat exchanger housing may be directed through the plenum chamber for providing additional heat transfer surfaces therein. The firebox may have a frusto conical shaped sidewall whereby the combustion surface area may be adjusted with the level of fuel in the firebox.

Abstract: The invention relates to the conversion of a substantially conventional gas fired furnace utilizing two or more of the clam shell-type heat exchanger cells, which is modified by converting one cell to a final stage counterflow heat exchanger for the hot gases of combustion, which modification incorporates directing the gases of combustion from the fired cells in a counterflow path through the non-fired cell by utilizing a positive displacement fan and then exhausting the gases of combustion. The modification eliminates the need for positive venting, while substantially increasing the operational efficiency of the furnace unit. The normal flue gas temperature in this type of furnace will be about 450.degree. F., while with the modification, the temperature will be reduced to less than about 200.degree. F. and efficiency will be increased by greater than 10 percent.

Abstract: A warm air furnace including a plenum, a blower, heat exchanger disposed within the plenum and an air distribution chamber. The heat exchanger includes an encasement surrounding a plurality of vertically extending heat exchanger tubes. The tubes are in communication with the plenum and with the air distribution chamber. A fibrous refractory inorganic tubular flame chamber is positioned within the encasement and is partially surrounded by the vertically extending tubes. The tubes are positioned in a generally U-shaped pattern and one of the tubes contacts the flame chamber. The tubes along the sides of the pattern are interconnected by upper and lower side baffles. The baffles are vertically spaced from each other to define exhaust outlets. A rear baffle extends between the tubes along the base of the pattern. A flue extends from the encasement for exhaust of combustion gases.

Abstract: A wood burning furnace includes a combustion enclosure made up of a lower closed generally rectilinear fire box which is defined at an upper portion thereof by a semicylindrical roof dome and a top cylindrical-shape smoke chamber supported on a rearward upright cylindrical smoke conduit and a forward upright smoke conduit, these conduits being supported on the fire box roof dome and open between the smoke chamber and fire box. The combustion enclosure is supported inside of a furnace shell above a fan compartment in that shell. The furnace shell and heating air baffles fastened to it are so constructed as to provide a heating air passage between the combustion enclosure and shell, and a blower in the fan compartment forces air from outside of the shell over the surfaces of the combustion enclosure and out the top of the shell to a location for use of heated air.

Abstract: The specification discloses a novel energy saving forced-air furnace. In contrast to previous forced-air furnaces, which ran only on gas or oil and in which approximately half of the energy derived from the burning fuel was lost through the chimney, the furnace of the present invention can run on coal, wood, gas or oil and retains a substantial portion of the heat which normally would be lost by the utilization of special tubing units and refractory plates. My furnace saves the greatest amount of energy possible by providing a heat chamber having a special tubing unit therein from the surface area of which heat generated in a stove chamber is transferred to a heat chamber and simultaneously through which exhaust gases air conducted from the stove chamber mounted below the heat chamber to the exterior of the furnace. Refractory plates are placed in a serial arrangement within the furnace heat chamber with spaces provided between them.

Abstract: The multipurpose heating apparatus comprises a hollow and closed elongated metal casing forming a combustion chamber which is fixedly mounted within a closed insulated elongated housing, with the combustion chamber casing being spaced from the top, side walls and part of the bottom wall of the housing to define an air circulating passageway. Air supply blower means is connected to one end of the air circulating passageway while the other end of the passageway is connected to an air return passage provided in the bottom wall of the housing. The combustion chamber is divided into a solid waste fuel burning zone and into a gas or liquid fuel burning zone. Fuel burned within the combustion chamber transfers heat to the metal casing which radiates the heat into the air circulating passageway.

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.