US2361643A - Heating apparatus - Google Patents

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US2361643A
US2361643A US2361643DA US2361643A US 2361643 A US2361643 A US 2361643A US 2361643D A US2361643D A US 2361643DA US 2361643 A US2361643 A US 2361643A
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chimney
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00Hot-air central heating systems; Exhaust gas central heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/02Hot-air central heating systems; Exhaust gas central heating systems operating with discharge of hot air into the space or area to be heated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S122/00Liquid heaters and vaporizers
    • Y10S122/01Air heater

Description

Oct. 31, 1944. M, U L 2,361,643

HEAT I NG APPARATUS Filed April 20, 1942 2 Sheets-Sheet 1 44 -v-- INVENTOR E wail A. Mueller 337% 9/L W 3%TORNEY Oct. 31, 1944. M. L. MUELLER 2,361,643

HEATING APPARATUS Filed April 20, 1942 2 Sheets-Sheet 2 iNVENTOR wrz iz 1, MuaZZer: M -Q3, *5

ATTORNEY f Patented Oct. 31, 1944 HEATING APPARATUS Moritz L. Mueller, Seattle, Wash., assignor, by mesne assignments, to Moritz L. Mueller and John H. Mueller, Seattle, Wasl1., as joint tenants Application April 20, 1942, Serial No. 439,654

17 Claims.

This invention relates to heating apparatus of the type in which the chimney forms at least a part of the heat exchanger.

A principal object of the invention is to provide a novel and less expensive construction of heating apparatus of the foregoing type.

Another object .of the invention is to provide a heating system formed of sheet metal in which the chimney which comprises a straight vertical flue is surrounded by a sheet metal jacket along a substantial part of its length to provide a heat exchanger through which air to be heated is circulated in counterflow relationship with respect to the flue gases.

Another object of the invention is to provide a compact, very efiicient, and inexpensive form of heating apparatus comprising a unit formed largely, if not entirely, of sheet metal and which is adapted for use in low-cost homes, factories, stores, etc., which do not have any basements, and which heatingapparatus is adapted to be arranged either on the floor of the building or suspended from above.

Another object of the invention is to provide a simplified, inexpensive type of sheet metal furnace construction which is formed integrally with the chimney and which has comparatively small horizontal dimensions relative to the height of the furnace so that very little floor space therefor is required.

merit of the heating apparatus illustrated in Fig. 5; I

Fig. 7 is a diagrammatic illustration of the control circuit for the motor of the blower of the unit illustrated in Fig. 6;

Fig. 8 is aview similar to Fig. 6 but illustrating a modified form of the invention;

Figs. 9 and 10 are fragmentary views illustrating modifications of Figs. 8 and 6 respectively.

Referring now to Figs. 1 to 4, there is illustrated a part of a house having space to be heated comprising rooms l2 and I4, attic It, a roof I, and no basement. A closet of rectangular form and formed of sheet metal is supported upon the floor 22 and extends vertically through and above the ceiling 24. A substantially straight [sheet metal chimney 26 having an enlargement Other objects and advantages of the invention will be apparent from a consideration of the following specification taken in conjunction with the accompanying drawings, of which there are two sheets and wherein:

Fig. 1 is a vertical cross section through a part of a house illustrating one embodiment of the invention and the air circulation through the furnace and the house;

Fig. 2 is a horizontal section taken in a plane along the line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is a horizontal section taken along the line 3-3 of Fig. 1, looking in the direction of the arrows;

Fig. 4 is a diagrammatic illustration of a circuit which may be employed for controlling the operation of the air blower motor;

Fig. 5 is a diagrammatic view of a vertical section through a part Of a factory with a saw-tooth roof and illustrating another embodiment of my invention employed as a heating apparatus for heating the same;

Fig. 6 is an enlarged elevational view with certain parts illustrated in section of the embodi- 28 at its lower end extends upright to and above the roof l8 of the building where it is provided with an atmospheric discharge. The enlarge.- ment 28 forms a combustion chamber 30 to the upper end of which the lower end of the chimney 26 is connected, the chimney 26 forming a substantially straight flue for conducting the prodnets of combustion from the chamber 30 to atmosphere.

In order to restrict the efiective draft in the combustion chamber 30 the chimney may be provided with a draft restricting device comprising an adjustably mounted plate damper 32 mounted on trunnions and arranged within the chimney 26 a short ways above the combustion chamber 30. A handle 34 accessible through a door 36 in the wall of the closet 20 is provided for adjusting the position of the damper 32.

Inwardly extending spiral vanes 38 carried by the wall of the chimney 26 above the damper 32 may be provided for imparting a spiraling motion to the products of combustion or flue gases in order to promote the exchange of heat through the metal wall of chimney 26. The enlargement 28 of the chimney 26 which forms the combustion chamber 30 is supported by the side walls of the closet 20 a short distance above the floor 22. Th plate 40 within the area enclosed by the enlargement 28 is perforated so as to provide an air intake opening for admitting air to the fuel burner 42 hereinafter described.

The lower end of the wall of the closet 20 may be cut away as at 44 so as to admit air to the under side of the perforations in the plate 40. v A plate 46 extending transversely of the vertical walls of the enlargement 28 divides the combustion chamber 30 and is provided with an opening 48. A pot burner 42 supported by the plate 46 below opening 48 is adapted to burn fuel oil under natural draft, the pot burner 42 comprising a common type of heat vaporizing or atmospheric type of oil burner now available on the market.

Oil from a reservoir (not shown) is admitted to the burner 42 under the regulation of a control valve 59 provided with a hand control 52 by means of which the rate of fuel feed to the burner may be varied. The burner 42 at pilot fire will support combustion within the burner 42 but when the control 59 has been set to supply oil to the burner at an increased rate, some of the oil vapors will pass through the opening 48 and burn in the combustion chamber 99. The chimney 26 conducts the products of combustion from the chamber 39 to atmosphere and due to the fact that the flue passageway formed by the chimney 26 is substantially straight, a six-inch diameter pipe will provide sufficiently strong draft to enable the burner 49 to operate at high efliciency under natural draft.

A pipe 54 closed at its upper end and arranged around the chimney defines a path 55 for circulating air in heat exchange relationship with the chimney 26. The lower end of the pipe 54 is enlarged at 55 in view of the enlargement 28 of the chimney 26 and terminates a short distance above the plate 49. The pipe 54 is arranged between the wall of the closet 29 and the chimney 26 throughout the entire extent of the closet 29 except at the very bottom thereof and cooperates with the wall of the closet 29 to provide a path 58 for conducting heated air from the lower end of the enlargement 56 to warm air discharge openings 69, 62, and 64 arranged adjacent the ceiling 24. The wall of the closet 29 may be provided with one or more warm air discharge openings 66 just above the plate 49 for discharging heated air into the space to be heated adjacent the floor 22 thereof.

At its top the closet 29 is sealed to the pipe 54 which projects thereabove and the pipe 54 at its top is sealed to the chimney 26 which projects thereabove and through the roof l8 of the building. The closet 29 maybe said to comprise a plenum chamber which as heretofore indicated is provided with suitable warm air discharge openings for delivering air to various parts of the space to be heated. The openings 62 and 64 may have ducts 68 and 19 connected thereto for conducting the heated air to distant parts of the house.

The path 55 for circulating air inheat exchange relationship with the heat exchange surface provided by the outside of the chimney 26 is provided with an inlet 12 and means are pro-=- vided for supplying air from the space to be heated to such inlet 12, said means comprising a cold air return or opening 14 formed in the wall of the space adjacent the floor 22 thereof and communicating with a duct 76 formed in the wall of the space, a horizontal duct '39 formed between the joists above the ceiling 24 and communicating at one end with the upper end of the duct 16 and at its other end with a header 89 which through a duct 82 is connected to the intake side of a forced air circulating means or blower 84, the discharge side of which has connected to it a conduit 86 for conducting and delivering air under pressure to the opening 12 at the upper end of the path 55 of the heat exchanger. The blower 84 may be driven by an electric motor 88 and when so driven is adapted to circulate air from the space I 4 through the opening 14, ducts l6 and I8, header 89, conduits 82 and 86 through the air path 55 of the furnace, and thence through the various warm air outlet openings 69, 62, 64, 66, 69 to the several parts of the space to be heated.

The upper end of the air path 55 may be provided with an air bleed so as to permit gravity circulation of air upwardly through the path for the purpose of dissipating heat from the chimney 26 if the blower 88 fails to operate under certain conditions. This bleed comprises a port 99 adapted to be closed by a damper 92 pivoted at 94. The port 99 may comprise an opening formed in the end of a pipe section 96 which projects laterally from the elbow at the upper end of the conduit 86. The damper 92 is shown in Fig. 1 in its closed position in full lines, and in its open position in dotted lines.

The end of the pipe section 96 may be provided with a flange 98 which forms a seat for the damper 92 in its closed position. The air discharged by the blower 84 during operation thereof will move the damper from its open to its closed position and the damper is so mounted on the pivot 94 that the damper 92 will remain in its closed position when the blower 84 is not operating, except as hereinafter described.

A thermostatic element I99 mounted on a wall I92 which closes the pipe section 96 below the damper 92 is provided with an arm. B94 which is adapted to engage an arm I96 carried by the damper 92 for moving the end of the arm )6 in the position indicated by the arrow 198, thereby to initiate opening movement of the damper 92. As soon as the damper 92 moves a short distance away from its seat 98, gravity acting on the damper 92 will move it to the dotted line position where it is held by reason of the fact that the end of the arm I96 will engage the inside of the wall I 92 and-act as a stop for limiting opening movement of the damper. The thermostat I99 is arranged so as to open the damper 92 if the temperature of the air in the path 55 and the upper end of the conduit 86 exceeds a predetermined amount, say, for example, 225 F. This condition might arise when the burner 92 is operating at high fire and the blower 94 fails to operate. When the damper 92 opens, air is free to circulate upwardly through the path 55 and be vented into the attic l6 through the port 99, thereby dissipating heat from the chimney 26 and preventing overheating of the heating system if the air blower fails to operate.

The circuit for the blower motor 89 is diagrammatically illustrated in Fig. 4 and includes a circuit H9 connected to a suitable source of current and provided with a normally open switch H2. A rotary cam H4 carried by the shaft of the control 59 to which the handle or knob 52. is afllxed is adapted to cooperate with the switch H2 for closing the same when the handle 52 is turned for the purpose of adjusting the valve 59 so as to increase the rate of fuel feed to the burner 52. The control 59 may be arranged when the handle 52 is in one position thereof to pass only sufiicient fuel to the burner 42 to support a pilot flame in the burner 42 and combustion chamber 39, andthe cam H9 may be arranged on the control shaft so that when the burner 42 is operating on pilot flame the switch 2 will be open. However, as soon as the handle 52 is turned to increase the fuel feed to the burner 42, the cam H4 will close the switch H2 and thereby effect operation of the blower 94 and the forced circulation of air continuous chimney 26.

surrounded by a pipe I22.

through the heating system as previously described. When the handle 52 is subsequently returned to its low or pilot fire position, the

switch H2 will open and discontinue operation through the chimney 26 under natural draft and escape to atmosphere through the atmospheric vent at the upper end of the chimne'y:- The air to be heated supplied to the upper end of the air path 55 flows downwardly through the path 55 and in countercurrent heat exchange relationship with the upwardly flowing flue gases,

and after leaving the path 55 the heated air is discharged through the variousopenings in the wall of the closet 20.

The chimney 26 may be formed of sections of sheet metal pipe coated with porcelain inside and out to resist corrosion and which are secured together so as to provide the vertical The air forced through the path 55 by the blower 04 under the discharge pressure thereof is under a greater pressure than the pressure of the flue gases inside the chimney 26 in view of the fact that they pass upwardly through the chimney under natural draft, so that if there is any leakage of the chimney 26 it will be of air from the path 55 into the chimney 26, thereby avoiding contamination of the air path 55.

That portion of the chimney 26 and the enlargement 28 thereof surrounded by the pipe 54 forms an elongated vertically arranged heat ex-- changer which is of a length in excess of the normal vertical clearance provided in 'a basement or between the floor and ceiling of a room in an average dwelling. In other words, and as apparent from Fig. 1 of the drawings, the heat exchanger of the furnace extends throughout substantially the entire extent of one floor, through the ceiling thereabove, and materially above the ceiling. By reason of this, the floor area required for heating systems of this kind is relatively low as compared with conventional heating systems; for example, in the structure illustrated in Fig. l, the outside dimensions of the closet 20 may be 18 inches square, and where the pipe 64 extends approximately four feet above the upper end of the closet 20, a heat output of the system of approximately 68,000

B. t. u.s per hour can be obtained where the pipe 54 is ten inches in diameter, and the pipe 26 is six inches in diameter.

In the modifications illustrated in Figs. 5 to inclusive, the heating system illustrated in Fig. l is shown as adapted for heating space in a factory. Referring to Fig. 6, for example, a heating furnace adapted for factory use may comprise an elongated vertical smoke pipe I The smoke pipe or chimney I20 as shown in Fig. 5 is adapted to extend through the roof of the factory building and is provided with an atmospheric discharge above the roof. The lower end of the chimney or smoke pipe I20 has connected thereto a combustion chamber I24 having fuel burning means indicated generally at I26 associated therewith, the said fuel burning means being provided with an air intake opening I28 and being adapted to operate under natural draft. The fuel burning means I26 may be of the type illustrated in Fig. l. The pipe I22 as illustrated in Fig. 6 surrounds the chimney I20 throughout a substantial portion of its length, that portion of the chimney I20 surrounded by the pipe I22 comprising a heat exchanger. The pipe I22 is open at its bottom so as to deliver air downwardly. The pipe I22 is closed as its top around the chimney I20 and carries a blower I30 driven by electric motor I32. A thermostatic switch I 34 having a thermal element I36 arranged in the chimney I20 just above the pipe I22 is adapted to open and close the motor circuit which is die.-

grammatically illustrated in Fig. 7.

The switch I34 may be set to close the motor circuit when the flue gas temperature passing the element I36 attains a predetermined degree, say, for example, 225 F. and to open the motor circuit when the temperature of th fiue gases passing the element I36 drops below a predetermined degree, for example, 200 F. The blower I30 is provided with an intake and discharges air under pressure into the upper end of the pipe I22 and effects a downward circulation of air over the heat exchanger surface of the chimney I22 and downwardly from the lower open end of the pipe I22. The structure illustrated in Fig. 6 comprises a unit which is adapted to be suspended in the upper part of space to be heated, for example, as illustrated in Fig. 5, and during operation will take air from the upper part of such space'and after heating it deliver it downwardly toward the floor.

The structure illustrated in Fig. 8 is a modification of that illustrated in Fig. 6 and diifers therefrom in that the air pipe I42 is arranged inside of and in spaced relation with the chimney or smoke pipe I40. The lower end of the pipe I42 terminates in a header I44 provided with laterally extending outlets I46 projecting through the wall of the pipe I 40 above the combustion chamber I46 therein. The combustion chamber I46 may have the same type of fuel burning means associated therewith as illustrated in Fig. 6, and such fuel burning means during operation thereof under natural draft generates heated products of combustion which pass upwardly through the space between the pipes I42 and I40. Above the pipe I42 the smoke pipe I40 may be reduced in diameter as at I50 and project upwardly through the roof to an atmospheric discharge as does the smoke pipe I20 illustrated in Fig. 6. The blower, motor, control and circuit for the motor of the modification illustrated in Fig. 8 may be the same as that illustrated in Fig. 6, and hence need not be further described. The structure illustrated in Fig. 8 comprises a unit similar to that illustrated in Fig. 6 except that in the case of Fig. 8 the air path is inside of and surrounded by the products of combustion, whereas in Fig. 6 the reverse is true. The outlets I46 formed in the header I44 may be provided with louvers for deflecting the warm air downwardly toward the lower part of the space to be heated.

Figs. 9 and 10 are modifications of Figs. 6 and 8 and illustrate the use of gas burners as the means for burning fuel. As shown in Fig. 9, which is a modification of Fig. 8, the lower end of the smoke pipe or chimney is enlarged to provide a combustion chamber I60 in which a gas burner I62 is arranged. the chamber I60 being provided with an air intake opening I64 and agas burner I62 being arranged to operate under natural draft. Fig. 10, which is a modification of the structure illustrated in Fig. 6, may have the lower end of the smoke pipe formed to provide a combustion chamber I60 like that illustrated in Fig. 9 and provided with a gas burner I62 like that illustrated in Fig. 9. Except in the foregoing particulars, the construction and operation of the structures illustrated in Figs. 9 and 10 are like that of the structures illustrated in Figs. 8 and 6 respectively.

The fuel burning means illustrated in Figs. 6 and 8 may be provided with a control like that illustrated in Fig. 1, or such fuel burning means, as well as those illustrated in the modifications disclosed in Figs. 9 and 10, may be provided with controls as illustrated in my Patent No. 2,348,834, granted May 16, 1944.

While the invention has been described with some detail, it isto be understood that the description is for th purpose of illustration only and is not definitive of the limits of the inventive idea. The right is reserved to make such changes in the details of construction and arrangement of,

partsas will fall within the purview of the attached claims.

The intake for the blower I30 is not shown but is provided on the side opposite the motor 132 and permits the blower to draw air therethrough from the upper end of the space to be heated. As this opening to the blower is not closed and is at the upper end of the path for air through the pipes I22 and I46, such blower intake opening will vent heated air from the pipes [22 and M when the blower fails to operate in accordance with th heat output of the fuel burning means.

I claim:

1. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a metallic chimney which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, a hollow member extending longitudinally of and along a substantial portion of the length of said chimney and providing a unidirectional single path for how of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, the upper end of said hollow member and chimney projecting above said closet, said closet being provided with heated air outlets through all of which heated air is discharged at substantially the same temperature into said space, an air blower located outside of said closet and operatively connected to said space and to said air inlet in the upper portion of the hollow member which projects above said closet, said blower being operative to supply from said space to the upper end of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, and means for operating said blower during operation oi said fuel burning means.

2. A heating system for supplying heated air to a space below a ceiling in a building to be cccupied by and for the comfort of human beings comprising a metallic chimney which extends upright through the ceiling and to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a substantially straight path for flow of the combustion products from said combustion chamber to said atmospheric discharge, a hollow metallic member extending longitudinally of and along a substantial portion of the length of said chimney and providing a unidirectional uninterrupted path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, the lower end of said hollow member surrounding said combustion chamber, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a vertically elongated closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, said closet extending upright at least to the ceiling of said space, the upper end of said hollow member and chimney projecting above said closet, said closet being provided with heated air outlets through all of which heated air is discharged at substantially the same temperature into said space, an air .blower arranged outside of said closet and said space and operatively connected to said space and to said air inlet in the upper portion of the hollow member which projects above said closet, said blower being operative to supply from said space to the upper end of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, and means for operating said blower during operation of said fuel burning means.

3. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings, said building having a ceiling above and a floor below said space, said system comprising a metallic chimney supported on said floor and which extends upright through the ceiling and to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, a hollow tubular member extending longitudinally of and along a substantial portion of the length of said chimney and providing a unidirectional continuous path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a vertically elongated closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, the upper end of said hollow member and chimney projecting above said closet, said closet being supported on said floor and extending above said ceiling and being provided with heated air outlets through all of which heated air is discharged at substantially the same temperature into said space, an air blower arranged outside of said closet and operatively connected to said space and to said air inlet in the upper portion of the hollow member which projects above said closet, said blower being operative to supply from said space to the upper end of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, and means for operating said blower during operation of said fuel burning means.

4. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a metallic chimney which extends upright to and above the roof of the building and has an atp e i di charge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge. a hollow member extending longitudinally of and along a substantial portion of the length of said chimney and providing a path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, the lower end of said hollow member surrounding said combustion chamber, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during opera tion of said system at a substantially uniform temperature. a closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, the upper end of said chimney projecting above said closet, said closet being provided with heated air outlets through which heated air is d scharged at substantially the same temperature into said space, an air blower located outside of said closet and operatively connected to said space and to said air inlet in said hollow member, said blower being operative to supply from said space to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, means for operating said blower during operation of said fuel burning means above a pilot fire rate, and an air bleed at the upper end of said air path for venting heated air from said air path when said blower fails to operate during operation of said fuel burning means above a pilot fire rate.

5. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a metallic chimney which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, a hollow member extending longitudinally of and along a substantial portion of the length of said chimney and providing a unidirectional path for flow of air in intimate countercurrent heat exchange a relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, the upper end of said hollow member and chimney projecting above said closets-said closet being provided with heated air outlets through which heated air is discharged at substantially the same temperature into said space, an air blower located outside of said closet and operatively connected to said space and to said air inlet in the upper portion of the hollow member which projects above said closet, said blower being operative to supply from said space to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, means for operating said blower in accordance with the heat output of said fuel burning means, and an air bleed at the upper end of said air path for venting heated air from said air path during operation of said fuel burning means when said blower fails to operate in accordance with the heat output of said fuel burning means.

6. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a metallic chimney which extends upright to and above the roof of the building and has an atmospheric discharge external of the space, a combustion chamber in the lower portion of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and'functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, a hollow metallic member extending longitudinally of and along a substantial portion of the length of said chimney and providing a unidirectional path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a vertically elongated metal closet in which the lower ends of said hollow member and chimney are arranged and into which heated air is delivered through said outlet, the upper end of said hollow' member and chimney projecting above said closet, said closet being provided with heated air outlets through which heated air is discharged at substantially the same temperature into said space, an air blower outside of said closet and space and operatively connected to said space and to said air inlet in the upper portion of the hollow member which projects above said closet, said blower being operative to supply from said space to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, means for operating said blower in accordance with the rate of fuel input to said fuel burning means, and an air bleed at the upper end of said air path for venting heated air from said air path during operation of said fuel burning means when said blower fails to operate in accordance with the rate of fuel input to said fuel burning means.

7. A heating system for supplyingheated air to a space in a building to be occupied by and for the comfort of human beings comprising a vertically elongated closet arranged in said spac an elongated hollow member vertically arranged in said closet in spaced relation to the walls thereof and projecting thereabove, a metal chimney arranged in said hollow member in spaced relation with the walls thereof and projecting thereabove, said chimney extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space. a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, said hollow member providing a path for flow of air in intimate heat exchange relationship with said path for flow of the combustion products, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, an air blower located outside of said closet and operatively connected to said space and to said air inlet of said hollow member, said blower being operative to supply from said space to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion. and means for operating said blower during operation of said fuel burning means. said air outlet of said air path opening into said closet and said closet being provided with heated air outlets through all of which heated air is discharged at substantially the same temperature into said space.

8. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a vertical closet arranged in said space, an elongated hollow member vertically arranged in said closet in spaced relation to the walls thereof and projecting thereabove, a metal chimney arranged in said hollow member in spaced relation with the walls thereof and projecting thereabove, said chimney extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney and surrounded by'the lower end of said hollow member, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, said hollow member providing a path for flow of air in intimate countercurrent heat exchange relationship with said path for flow of the combustion products, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, an air blower located outside of said closet and space and operatively connected to said space and to said air inlet in the upper end of said hollow member, said blower being operative to supply from said space to the upper end of said air path, air to be heated and under a pressure reater than the pressure of the products of combustion and means for operating said blower during operation of said fuel burning means, said air outlet in the lower end of said air path opening into said closet and said closet being provided with heated air outlets through which heated air is discharged at substantially the same temperature into said space,

9. A heating system for supplying heated air to a space in a building to be occupied by and for the comfort of human beings comprising a vertically elongated closet arranged in said space and supported on the floor thereof, an elongated hollow member vertically arranged in said closet in spaced relation to the walls thereof, a metal chimney arranged in said hollow member in spaced relation with the walls thereof and projecting thereabove, said chimney extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, said hollow member providing a path for flow of air in intimate countercurrent heat exchange relationship with said path for flow of the combustion products, said ai path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, an air blower outside of said closet and operatively connected to said space and to said air inlet in the upper end of said hollow member, said blower being operative to supply from said space to the upper end of said air path, air to be heated and under a pressure greater than the pressure of the products of combustion, means for operating said blower during operation of said fuel burning means above a pilot fire rate, said outlet in the lower end of said air path opening into said closet and said closet being provided with heated air outlets through which heated air is discharged at substantially the same temperature into said space, and a thermostatically controlled air bleed at the upper end of said air path for venting heated air therefrom when said blower fails to operate during operation of said fuel burning means above a pilot fire rate.

10. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced metal pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for fiow of the combustion products from said combustion chamber to said atmospheric discharge, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a temperature of the order of that at which combustion occurs in said combustion chamber, the other of said pipes providing a unidirectional path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space. said blower being operative during operation of said fuel burning means to supply from said space through said inlet opening to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, said unit being suspended above the floor of said space and having said air outlet arranged to discharge heated air downwardly toward the floor of said space.

11. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged, spaced elongated metal pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in saidlower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a temperature of the order of that at which combustion occurs in said combustion chamber, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a unidirectional path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and contsructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative during operation of said fuel burning means to supply from said space'through said air inlet opening to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, said air path having an opening at the upper end thereof operable when said blower is not operating for venting heated air from said air path.

12. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced metal pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes forming a chimney and extending upright from its lower end to and above the roof of the building and havfng an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to sad chimney, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a temperature of the order of that at which combustion occurs in said combuston chamber, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a unidirectional path for flow of a r in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that allot the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operat'on of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative during operation of said fuel burning means to supply from said space through said air inlet open'ng to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, said air path being of suilicient length so that the forced flow of air therethrough due to said blower will cool the products of combustion from combustion temperature down to at least 300 F. during normal operation of said heating system, and a vertically elongated closet in which the lower ends of said pipes are arranged and into which heated air is delivered from said heated air discharge outlet of said air path, said closet being arranged in said space and being provided with warm air outlets through which heated air is discharged at substantially the same temperature into said space,

13. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced metal pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a temperature of the order of that at which combustion occurs in said combustion chamber, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a unidirectional path for flow of air around and in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative during operation of said fuel burning means above a pilot fire rate to supply from said space through said air inlet opening, to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, said air path being of suflicient length so that the forced flow of air therethrough will cool the products of combustion from combustion temperature down to at least 300 F, during normal operation of said heating system, said air path having an opening at the upper end thereof for venting heated air therefrom when said blower fails to operate during operation of said fuel burning means above a pilot fire rate.

14. A heating" system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced metal pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a tempera ture of the order of that at which combustion occurs in said combustion chamber, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a unidirectional path for flow of air surrounded by and in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative during operation of said fuel burning means above a pilot fire rate to supply from said space through said air inlet opening, to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, said air path being of sufilcient length so that the forced flow of air therethrough will cool the products of combustion from combustion temperature down to at least 300 F. during nor mal operation of sa d heating system, said air path having an opening at the upper end thereof for venting heated air therefrom when said blower fails to operate during operation of said fuel burning means above a pilot fire rate.

15. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, said unit being supported in said space adjacent the upper portion thereof and so as not to occupy space adjacent thefioor of said space, one of said pipes being formed of metal'and forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external ofsaid space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a path for flow of air in intimate countercurrent heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path I and is deliveied therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space,

said blower being operative to supply from said outlet arranged to discharge heated air downwardly toward the floor above which it is supported.

16. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes being formed of metal and forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a path for flow of air in intimate countercurrent heat exchange relationship with the pathfor flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which.

enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative during operation of said fuel burning means above a pilot fire rate, to supply from said space through said air inlet opening to said air path, air to be.

heated and under a pressure greater than the pressure of the products of combustion in said chimney, said air path having an opening at the upper end thereof operable when said blower is not operating during operation of said fuel burning means above a pilot fire rate for venting heated air from said air path.

17. A heating system for supplying heated air to a space in a building for human occupancy comprising a pair of vertically disposed telescopically arranged spaced pipes, said pipes having a length many times greater than the diameter thereof, said pipes being secured relative to each other so as to form a unit, one of said pipes being formed of metal and forming a chimney and extending upright from its lower end to and above the roof of the building and having an atmospheric discharge external of said space, a combustion chamber in said lower end of said chimney, fuel burning means in said combustion chamber constructed and arranged for burning fuel under natural draft operation and functioning to supply heated products of combustion to said chimney, said combustion chamber being arranged relative to said chimney so that the heated products of combustion generated in said combustion chamber are supplied to said chimney at a temperature of the order of that at which combustion occurs in said combustion chamber, said chimney providing a path for flow of the combustion products from said combustion chamber to said atmospheric discharge, the other of said pipes providing a path for flow of air in intimate heat exchange relationship with the path for flow of the combustion products upwardly through said chimney, said air path being provided with its air inlet at its upper end and its air outlet at its lower end and constructed so that all of the air which enters said path traverses substantially all of said path and is delivered therefrom at any one time during operation of said system at a substantially uniform temperature, a blower operatively connected to said air inlet opening and to said space, said blower being operative to supply from said space through said air inlet opening to said air path, air to be heated and under a pressure greater than the pressure of the products of combustion in said chimney, and a closet which extends vertically a distance equal to or more than the height of one floor of said heated space and in which the lower ends of said pipes are arranged, said heated air outlet opening into said closet and said closet being provided with heated air outlets through which heated air is discharged at substantially the same temperature into said space.

MORITZL. MUELLER.

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474090A (en) * 1944-12-04 1949-06-21 Harvey Whipple Inc Multiple tube forced-draft and air flow air heater
US2481861A (en) * 1949-09-13 Heating apparatus
US2524843A (en) * 1948-09-10 1950-10-10 Wilmer L Slifer Hot-air heating system
US2611599A (en) * 1948-05-18 1952-09-23 Jet Heet Inc Heater for enclosed spaces
US2821975A (en) * 1954-12-31 1958-02-04 Robert K Thulman Fireplace construction
US3120225A (en) * 1961-05-02 1964-02-04 Peerless Mfg Division Wall furnace
US4294223A (en) * 1979-01-29 1981-10-13 Albert Montague Bi-loop heat recovery system for an oil fired furnace
US4300527A (en) * 1977-10-03 1981-11-17 Albert Montague Bi-loop heat recovery system
US4955359A (en) * 1989-08-08 1990-09-11 Robert Sun Company Furnace with counterflow heat exchange means
US20080134600A1 (en) * 2006-12-07 2008-06-12 The Mattamy Corporation Insulating method and ducting configuration

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2481861A (en) * 1949-09-13 Heating apparatus
US2474090A (en) * 1944-12-04 1949-06-21 Harvey Whipple Inc Multiple tube forced-draft and air flow air heater
US2611599A (en) * 1948-05-18 1952-09-23 Jet Heet Inc Heater for enclosed spaces
US2524843A (en) * 1948-09-10 1950-10-10 Wilmer L Slifer Hot-air heating system
US2821975A (en) * 1954-12-31 1958-02-04 Robert K Thulman Fireplace construction
US3120225A (en) * 1961-05-02 1964-02-04 Peerless Mfg Division Wall furnace
US4300527A (en) * 1977-10-03 1981-11-17 Albert Montague Bi-loop heat recovery system
US4294223A (en) * 1979-01-29 1981-10-13 Albert Montague Bi-loop heat recovery system for an oil fired furnace
US4955359A (en) * 1989-08-08 1990-09-11 Robert Sun Company Furnace with counterflow heat exchange means
US20080134600A1 (en) * 2006-12-07 2008-06-12 The Mattamy Corporation Insulating method and ducting configuration

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