US3813039A - Heat exchanger - Google Patents

Heat exchanger Download PDF

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US3813039A
US3813039A US34482973A US3813039A US 3813039 A US3813039 A US 3813039A US 34482973 A US34482973 A US 34482973A US 3813039 A US3813039 A US 3813039A
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heat exchanger
damper
smoke pipe
induced draft
smoke
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G Wells
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G Wells
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001Recuperative heat exchangers
    • F28D21/0003Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0008Air heaters
    • 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
    • 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
    • Y10S165/00Heat exchange
    • Y10S165/901Heat savers

Abstract

A heat exchanger connected to the smoke pipe of a central heating furnace below the horizontal plane of the smoke pipe and with an induced draft such that upon operation of the induced draft, the smoke pipe is blocked requiring the hot flue gasses to bypass through the heat exchanger and when the furnace operates without operation of the induced draft, the smoke pipe is open for direct flow of hot flue gasses.

Description

finite States atent 1191 Wells 1 1 May 28, 1974 [54] HEAT EXCHANGER 2,362,940 11/1944 Skerritt 165/166 3192 $28 211252 LZEZfiStf'. 1211 11 1 Littleton, NH. 03561 i 1 Filed! Mal? 1973 Primary ExaminerWilliam E. Wayner Assistant Examiner-W. E. Ta olcai Jr. 21 A 1.N.:344829 P 1 1 pp 0 Attorney, Agent, or Firm-Thomas N. Tarrant [52] 11.8. C1 237/55, 110/56, 122/D1G. 1,

126/110 R, 165/38, 165/122 ABSTRACT [51] Int. Cl. F2411 7/04 A heat exchan ger connected to the smoke pipe of a [58] held of Search 237/55 126/ 110/56 central heating furnace below the horizontal plane of l22/DIG' 165/38 122 the smoke pipe and with an induced draft such that upon operation of the induced draft, the smoke pipe is [56] References C'ted blocked requiring the hot flue gasses to bypass UNITED STATES PATENTS through the heat exchanger and when the furnace op- 1,720,536 7/1929 Young 55/269 erates without operation of the induced draft, the 1,785,334 12/1930 Black 122/D1G. I smoke pipe is open for direct flow of hot flue gasses. 1,840,836 H1932 Davis, Jr..... 122/D1G. l 2,174,710 10/1939 Wagner 237/55 10 Claims, 3 Drawing Figures HEAT EXCHANGER BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heat exchangers and in particular to auxiliary heat exchangers for central heating units improving the efficiency of such units.

2. Relation to the Prior Art In the everlasting battle to decrease the cost and size of central heating installations, it has become a common practice to minimize the heat exchanger so that frequently a substantial portion of the generated heat passes wastefully up the chimney. In many instances, where space is available, it is economical to provide an auxiliary heat exchanger to absorb heat from the flue gasses of the smoke pipe. Many such heat exchangers are known which surround and take heat from the smoke pipe itself. U.S. Pat. Nos. 3,124,197; 2,468,909 and 2,362,940 are exemplary. More effective compact heat exchangers require a tortuous path for the flue gasses impeding and interfering with the draft. To overcome the draft problem, an induced draft fan is known as disclosed in US. Pat. No. 2,174,710.

When a tortuous path external to the furnace unit is provided for flue gasses, a number of safety hazards occur. Not only is the draft for proper operation of the burner likely to fail, but there is a much greater likelihood of dangerous leaks where the flue gasses may end up in living space.

SUMMARY OF THE INVENTION In accordance with the present invention, a heat exchanger has been provided bypassing a section of smoke pipe from a central heating furnace in which the heat exchanger lies below the horizontal plane of the bypassed smoke pipe and the bypassed section of smoke pipe contains a damper. This damper is forced to the closed position by operation of an induced draft device in the heat exchanger unit and opens during operation of the furnace when the induced draft device is not operating whereby normal flue draft is effective and the heat exchanger is effectively isolated from the flow of flue gasses in the absence of induced draft. Thus, it is an object of the invention to provide a novel auxiliary heat exchanger for central heating systems.

It is a further object of the invention to provide an induced draft system for an auxiliary heat exchanger in which the induced draft device coacts with a smoke pipe damper so as to place the heat exchanger in the path of flue gasses only during operation of the induced draft.

Further objects and features of the invention will be better understood after reading the following description together with the drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation partially in section of a heat exchanger according to the invention.

FIG. 2 is a plan view in section along line 22 of FIG. 1.

FIG. 3 is a sectional view of the smoke pipe of FIG. 1 during heating unit operation in the absence of induced draft.

DESCRIPTION OF THE PREFERRED EMBODIMENT The invention provides an auxiliary heat exchanger for a central heating system which bypasses a section of the furnace smoke pipe only during operation of the auxiliary unit and substantially extracts the heat from the hot flue gasses before they pass up the chimney.

Thus, FIG. 1 depicts smoke pipe 10 connected to a furnace (not shown) at inlet end 11 and to a chimney flue (not shown) at output end 12.

Damper 14 is supported on pin 15 which in turn is mounted on bearings (not shown) in the walls of pipe 10. Pin 15 supports damper 14 off center being considerably closer to the upper edge of damper 14. In order that damper 14 may open fully even though suspended off center, damper 14 is made smaller in its transverse direction than the inside diameter of pipe 10 and flanges 16 and 17 are positioned around the inside circumference of pipe 10 to act as sealing flanges when damper 14 is closed. Flange 16 is secured in the bottom circumference of pipe 10 on the inlet side of damper 14 while flange 17 is secured to the upper portion of pipe 10 on the outlet side of damper 14. Flanges 16 and 17 are discontinuous in the vicinity of pin 15 permitting damper 14 to swing through an arc of substantially Adjustable balance weight 18 is centrally located in damper 14 above pin 15 for adjusting the balance of damper 14 to open under conditions of normal operating draft. Auxiliary heat exchanger 20 is connected to smoke pipe 10 through downpipe 21 on the inlet side of damper l4 and through induced draft pipe 23 is connected to smoke pipe 10 on the outlet side of damper 14. Downpipe 21 makes a tee connection with pipe 10 at its upper end and connects to inlet 22 of heat exchanger 20 at its lower end. Inlet 22 is a passage to the bottom of heat exchanger 20 connecting to open ends of a plurality of vertically positioned cylindrical tubes 24. First plurality of cylindrical tubes 24 is depicted as 1! tubes shown in FIG. 2. The bottom ends of tubes 24 are supported in spaced relationship and spaces between them are blocked by sealing plate 25. A supporting partition 26 terminates inlet passage 22 so that any incoming hot flue gasses must pass vertically upward through tubes 24. The upper ends of tubes 24 are spaced below the upper surface of heat exchanger housing 27 and supported in spaced relation by sealing plate 28. Tubes 24 open at their upper ends into space 30 between housing 27 and sealing plate 28. Space 30 is open to the upper ends of tubes 24 and also the upper ends of second plurality of tubes 31. Space 30 is terminated by a supporting seal 32 so that flue gasses passing upward through tubes 24 must in turn pass downward through tubes 31.

Referring to FIG. 2 it will be seen that tubes 31 are a second plurality of vertically positioned cylindrical tubes depicted as 11 tubes. The bottom ends of tubes 31 open into a further space 34 which is continuous across the open bottom ends of third plurality of vertically positioned cylindrical tubes 35. The bottom ends of tubes 31 and tubes 35 are supported in spaced relationship by sealing plate 36. Space 34 is an enclosed space such that hot gasses passing downwardly through tubes 31 must pass upwardly through tubes 35. Referring again to FIG. 2 it will be seen that tubes 35 are also depicted as 11 tubes. Space 37 communicating with the upper ends of tubes 35 is connected to induced draft blower 38 by passage 40. Tubes 35 are supported in spaced. relation at their upper ends by a sealing plate 41.

Baffle 42 supported adjacent opening 44 between passage 40 and space 37 serves to improve dynamic flow of gasses into passage 40.

Blower 38 suitably of the squirrel cage electrically driven type is connected to pull gasses through passage 40 driving them through induced draft pipe 23 into smoke pipe 10. induced draft pipe 23 is depicted as angled toward outlet 12 of pipe at its connection point with pipe 10. The angle of this pipe will be discussed further in connection with the operation of the heat exchanger.

Second blower 45 has an intake opening 46 into ambient space around the heat exchanger. An air filter (not shown) is desirably positioned across this opening to filter out dust and opening 46 may be connected to outdoors or some other location as desired. Blower 45 is depicted in FIG. 2 as connected to a side wall 47 of heat exchanger and blows into passages around tubes 24, 31 and to carry heat from the tubes. Looking at the sectional plan view in FIG. 2 it will be seen that blower blows air in past and around the third plurality of tubes 35. A baffle 50 separates tubes 35 from tubes 31 extending from wall 47 to a position short of opposite wall 51 so that the air from blower 45 must pass by and around tubes 35 before encountering tubes 31 after passing around the end of baffle 50. A second baffle 52 separates tubes 24 from tubes 31 extending the confined circuitous travel of the air from blower 45 so that it is'forced by and around tubes 31 and then tubes 24 before reaching outlet 54 in wall 51. Outlet 54 is suitably connected to a register for providing heated air into the immediately adjacent space or may be connected to ducting so as to provide heated air at a distant location.

The number and diameter of tubes 24, 31 and 35 is determined so as to provide efficient flow of flue gasses. However, the efficiency of heat transfer is determined by the area of exposed metal surface of the tubes from which the heat is picked up by air passing from blower 45 to the outlet 54. For a more compact design than that depicted, fewer tubes of a larger diameter may be utilized or merely a shorter length of tubing having the same diameter with fins extending from the tubing walls normal to the axis of the tubing so as to increase thermal transfer.

In any kind of a combustion heating system a draft which provides a constant flow of air for combustion purposes and carries the waste products of combustion away is of significant importance. Commonly the draft is based upon the fact that hot gasses are lighter in weight than cold gasses and therefore rise. Accordingly, if a gas such as air is heated at the bottom of a vertical duct (i.e., chimney flue) and a much colder air exists at the top of the duct, the heated air will rise through the duct causing a draft.

Thus, when a furnace is ignited at the bottom of a vertical chimney flue, a definite pressure differential occurs between the combustion gasses in the furnace and the relatively cold air at the top of the chimney causing a dynamic flow. This is well known and in FIG. 1 will cause damper 14 in smoke pipe 10 to open under the pressure differential tending to allow the hot gas from the furnace entering at inlet 1 l to pass through on to outlet 12 and up the chimney. Damper 14 can be adjusted in balance by weight 18 either so that it will be normally open under residual draft that exists even when the furnace is not operating or so that it remains just barely closed to open on the smallest increase in heat on the furnace side. This latter is considered to be the preferred condition since it reduces loss of warm air up the chimney when the furnace is quiescent. However, on operation of blower 38, air or flue gas is pulled through the heat exchanger through inlet passage 22 and connecting pipe 21 producing a low pressure zone on the inlet side of pipe 10. At the same time, air and/or flue gasses are forced through draft pipe 23 into the outlet side of pipe 10 increasing the pressure in the outlet side of the pipe. Thus a pressure differential is produced across damper 14 forcing the damper closed. With damper l4 closed, all flue gasses must pass through heat exchanger 20. Thus as depicted in FIG. 1, low and high pressure zones produced by the induced draft means 38 operate damper 14. Some angling of pipe 23 is desirable for efficient utilization of induced draft means 38. Since the arrangement of draft means 38 tends to affect pressure on both sides of damper 14 simultaneously, any venturi effect is unlikely. Nevertheless, pipe size relationships, angles and opening characteristics must be designed to avoid venturi action. I

It will be recognized that other electrical or mechanical interlock means may be used to provide coaction between damper l4 and induced draft means 38. For example, the switch operating the electric motive power for induced draft means 38 may operate a solenoid actuating damper 14 from its closed to its open position. It will be recognized that this same switch during the heating season of the year would normally be interlocked with a switch operating the heating furnace or else even more desirably with a thermal switch reacting to the temperature of the smoke pipe. Additional thermostatic means could also be interconnected to avoid heat being providedin excess of a desired room temperature.

In the event that induced draft means 38 does not operate, heat exchanger 20 would be effectively isolated from the smoke pipe since damper 14 would open pro viding a more direct flow of flue gasses during operation of the furnace.

While the invention has been described with relation to a specific embodiment, it will be seen that a number of variations are available and are contemplated as within the scope of the invention to the extent covered by the appended claims.

I claim:

1. A heat exchanger forinsertion in the smoke pipe of a central heating unit between the heating unit and a chimney flue therefore comprising:

a. A direct smoke pipe connection for connecting the smoke flue of a central heating unit to a chimney flue;

b. A damper in said direct smoke pipe;

c. A plurality of smoke passages supported in spaced relationship within an enclosure;

d. A smoke passage connected to said direct smoke pipe upstream of said damper and to said plurality of smoke passages;

e. Induced draft means connected between said plurality of smoke passages and said smoke pipe downstream of said damper characterized in that operation of said induced draft means causes said damper to close; and,

f. Means to provide a flow of a heat distributing medium through said enclosure past said plurality of smoke passages for absorbing heat and distributing it.

2. A heat exchanger according to claim 1 wherein said damper is normally open.

3. A heat exchanger according to claim 1 wherein operation of said induced draft means produces a pressure differential in said smoke pipe across said damper causing it to close.

4. A heat exchanger according to claim 1 wherein said direct smoke pipe is in a substantially horizontal position entirely above said plurality of smoke passages.

5. A heat exchanger according to claim ll wherein said induced draft means is a blower.

6. A heat exchanger according to claim ll wherein said means to provide a flow of heat distributing medium is a blower to provide a flow of air.

7. An auxiliary heat exchanger for a furnace in combination with and bypassing a direct section of smoke pipe for connection between a furnace and a chimney flue comprising:

a. A damper in said direct section of smoke pipe;

b. An inlet passage connected between said smoke pipe and said heat exchanger on the furnace side of said damper;

c. An outlet passage connected between said heat exchanger and said smoke pipe on the chimney side of said damper;

d. A plurality of spaced flues connecting said inlet passage with said outlet passage as heat exchanging elements; and

e. Induced draft means for said heat exchanger coacting with said damper effecting closure of said damper upon operation of induced draft through 7 said heat exchanger.

8. An auxiliary heat exchanger according to claim 7 wherein said induced draft means is a blower located in said outlet passage.

9. An auxiliary heat exchanger according to claim 7 wherein said induced draft means coacts with said damper by placing a pressure differential across said damper effecting closure thereof.

10. An auxiliary heat exchanger according to claim 7 wherein said spaced flues are positioned vertically within an enclosure and air is circulated through said enclosure around said spaced flues and out as a space heating medium.

Claims (10)

1. A heat exchanger for insertion in the smoke pipe of a central heating unit between the heating unit and a chimney flue therefore comprising: a. A direct smoke pipe connection for connecting the smoke flue of a central heating unit to a chimney flue; b. A damper in said direct smoke pipe; c. A plurality of smoke passages supported in spaced relationship within an enclosure; d. A smoke passage connected to said direct smoke pipe upstream of said damper and to said plurality of smoke passages; e. Induced draft means connected between said plurality of smoke passages and said smoke pipe downstream of said damper characterized in that operation of said induced draft means causes said damper to close; and, f. Means to provide a flow of a heat distributing medium through said enclosure past said plurality of smoke passages for absorbing heat and distributing it.
2. A heat exchanger according to claim 1 wherein said damper is normally open.
3. A heat exchanger according to claim 1 wherein operation of said induced draft means produces a pressure differential in said smoke pipe across said damper causing it to close.
4. A heat exchanger according to claim 1 wherein said direct smoke pipe is in a substantially horizontal position entirely above said plurality of smoke passages.
5. A heat exchanger according to claim 1 wherein said induced draft means is a blower.
6. A heat exchanger according to claim 1 wherein said means to provide a flow of heat distributing medium is a blower to provide a flow of air.
7. An auxiliary heat exchanger for a furnace in combination with and bypassing a direct section of smoke pipe for connection between a furnace and a chimney flue comprising: a. A damper in said direct section of smoke pipe; b. An inlet passage connected between said smoke pipe and said heat exchanger on the furnace side of said damper; c. An outlet passage connected between said heat exchanger and said smoke pipe on the chimney side of said damper; d. A plurality of spaced flues connecting said inlet passage with said outlet passage as heat exchanging elements; and e. Induced draft means for said heat exchanger coacting with said damper effecting closure of said damper upon operation of induced draft through said heat exchanger.
8. An auxiliary heat exchanger according to claim 7 wherein said induced draft means is a blower located in said outlet passage.
9. An auxiliary heat exchanger according to claim 7 wherein saId induced draft means coacts with said damper by placing a pressure differential across said damper effecting closure thereof.
10. An auxiliary heat exchanger according to claim 7 wherein said spaced flues are positioned vertically within an enclosure and air is circulated through said enclosure around said spaced flues and out as a space heating medium.
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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944136A (en) * 1975-02-03 1976-03-16 Huie Edwin C Small building heating system
FR2316569A1 (en) * 1975-06-18 1977-01-28 Foster Wheeler Energy Corp Device for recovering the heat from a heat generator Exhaust gas
US4050627A (en) * 1976-08-20 1977-09-27 Kimball Of Minnesota, Inc. Adjustable heat recovery system for flue stacks
US4053106A (en) * 1976-11-02 1977-10-11 Robert Karl System for utilizing heat contained in flue gas
US4083398A (en) * 1975-12-18 1978-04-11 John F. Fallon, Jr. Waste heat recovery system
US4103735A (en) * 1976-09-07 1978-08-01 Albert Woodrow Warner Heat exchanger
US4124178A (en) * 1975-11-05 1978-11-07 Burke Ralph B Energy and fuel conserving unit heater
US4147303A (en) * 1977-04-29 1979-04-03 Anthony Talucci Heat-saving smoke pipe attachment
US4241874A (en) * 1979-05-02 1980-12-30 Schossow George W Heat exchanger
US4280555A (en) * 1979-06-25 1981-07-28 Leo Cieslak Heat exchanger for exhaust outlet of a room heating unit
FR2475707A1 (en) * 1980-02-07 1981-08-14 Sevelen Metallbau Heat exchanger housing inserted between two sections of exhaust - recovers waste heat with by=pass regulated via temp. sensors and computing mechanism
US4293032A (en) * 1979-12-06 1981-10-06 Asp Donald J Combination forced air furnace and air cooler
EP0042129A2 (en) * 1980-06-12 1981-12-23 Joh. Vaillant GmbH u. Co. Heat exchanger for flue gases
US4312321A (en) * 1980-04-07 1982-01-26 Gemini Systems, Inc. Heat exchanger construction for solid fuel burning furnace
US4318367A (en) * 1980-05-30 1982-03-09 Antonucci Louis T Energy recovery device
US4320739A (en) * 1979-05-25 1982-03-23 Martin Industries, Inc. Combustion type heater
EP0056670A2 (en) * 1981-01-16 1982-07-28 Nederlandse Energie Ontwikkeling Maatschappij (NEOM) B.V. Assembly comprising a heat recovery device
FR2510245A1 (en) * 1981-07-24 1983-01-28 Charraudeau Jacques Heat exchanger for gas flow - has one hot and one cold flow with parallel assemblies of folded material inside casing
DE3312260A1 (en) * 1982-04-05 1983-10-06 Robert C Brauer Hot air heating system
US4449569A (en) * 1981-03-24 1984-05-22 Exxon Research And Engineering Co. Method and apparatus for regulating fluid flows in parallel-connected conduits (e.g. in furnace installations having air preheaters and by-pass conduits)
US4558689A (en) * 1984-06-25 1985-12-17 Mccann Artie Combustion gas heat recovery apparatus
US4606399A (en) * 1985-07-17 1986-08-19 Heat Extractor, Inc. Heat recovery system with combustion gas accelerator
US4681153A (en) * 1983-05-31 1987-07-21 Nissan Shatai Company, Limited Automotive air conditioning system with independent temperature control for dual air flows
US4928749A (en) * 1985-05-08 1990-05-29 Industrial Energy Corporation Heat exchange recovery method
US5174271A (en) * 1990-10-10 1992-12-29 Samsung Electronics Co., Ltd. Heat exchanger with unitary air intake and exhaust member for an air conditioner
US6167846B1 (en) * 1998-05-14 2001-01-02 Toyota Jidosha Kabushiki Kaisha Catalytic combustion heater
US20090056705A1 (en) * 2007-08-30 2009-03-05 Suncue Company Ltd Combustion system
WO2013149392A1 (en) * 2012-04-05 2013-10-10 Zhu Hongfeng Biomass fuel stove
WO2013149391A1 (en) * 2012-04-05 2013-10-10 Zhu Hongfeng Simulated fireplace using biomass fuel
US20160177888A1 (en) * 2014-12-19 2016-06-23 Benteler Automobiltechnik Gmbh Exhaust gas heat exchanger

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US1785334A (en) * 1926-03-04 1930-12-16 Babcock & Wilcox Co Air heater
US1840836A (en) * 1929-06-17 1932-01-12 Shawperkins Mfg Company Heat exchanging apparatus
US2174710A (en) * 1937-07-02 1939-10-03 Charles H Wagner Air heating and conditioning apparatus
US2362940A (en) * 1942-04-08 1944-11-14 Roy P Skerritt Control for fuel economizers
US2468909A (en) * 1946-01-03 1949-05-03 Cnossen Auxiliary air heater
US2496738A (en) * 1943-01-15 1950-02-07 Stewart Warner Corp Heater

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US1785334A (en) * 1926-03-04 1930-12-16 Babcock & Wilcox Co Air heater
US1720536A (en) * 1926-06-16 1929-07-09 Westinghouse Electric & Mfg Co Heat exchanger
US1840836A (en) * 1929-06-17 1932-01-12 Shawperkins Mfg Company Heat exchanging apparatus
US2174710A (en) * 1937-07-02 1939-10-03 Charles H Wagner Air heating and conditioning apparatus
US2362940A (en) * 1942-04-08 1944-11-14 Roy P Skerritt Control for fuel economizers
US2496738A (en) * 1943-01-15 1950-02-07 Stewart Warner Corp Heater
US2468909A (en) * 1946-01-03 1949-05-03 Cnossen Auxiliary air heater

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944136A (en) * 1975-02-03 1976-03-16 Huie Edwin C Small building heating system
FR2316569A1 (en) * 1975-06-18 1977-01-28 Foster Wheeler Energy Corp Device for recovering the heat from a heat generator Exhaust gas
US4012191A (en) * 1975-06-18 1977-03-15 Foster Wheeler Energy Corporation System for recovering heat from the exhaust gases of a heat generator
US4124178A (en) * 1975-11-05 1978-11-07 Burke Ralph B Energy and fuel conserving unit heater
US4083398A (en) * 1975-12-18 1978-04-11 John F. Fallon, Jr. Waste heat recovery system
US4050627A (en) * 1976-08-20 1977-09-27 Kimball Of Minnesota, Inc. Adjustable heat recovery system for flue stacks
US4103735A (en) * 1976-09-07 1978-08-01 Albert Woodrow Warner Heat exchanger
US4053106A (en) * 1976-11-02 1977-10-11 Robert Karl System for utilizing heat contained in flue gas
US4147303A (en) * 1977-04-29 1979-04-03 Anthony Talucci Heat-saving smoke pipe attachment
US4241874A (en) * 1979-05-02 1980-12-30 Schossow George W Heat exchanger
US4320739A (en) * 1979-05-25 1982-03-23 Martin Industries, Inc. Combustion type heater
US4280555A (en) * 1979-06-25 1981-07-28 Leo Cieslak Heat exchanger for exhaust outlet of a room heating unit
US4293032A (en) * 1979-12-06 1981-10-06 Asp Donald J Combination forced air furnace and air cooler
FR2475707A1 (en) * 1980-02-07 1981-08-14 Sevelen Metallbau Heat exchanger housing inserted between two sections of exhaust - recovers waste heat with by=pass regulated via temp. sensors and computing mechanism
US4312321A (en) * 1980-04-07 1982-01-26 Gemini Systems, Inc. Heat exchanger construction for solid fuel burning furnace
US4318367A (en) * 1980-05-30 1982-03-09 Antonucci Louis T Energy recovery device
EP0042129A2 (en) * 1980-06-12 1981-12-23 Joh. Vaillant GmbH u. Co. Heat exchanger for flue gases
EP0042129A3 (en) * 1980-06-12 1982-08-25 Joh. Vaillant Gmbh U. Co Heat exchanger for flue gases
US4450901A (en) * 1981-01-16 1984-05-29 Stamicarbon B.V. Heat recovery attachment for a heating apparatus
EP0056670A2 (en) * 1981-01-16 1982-07-28 Nederlandse Energie Ontwikkeling Maatschappij (NEOM) B.V. Assembly comprising a heat recovery device
EP0056670A3 (en) * 1981-01-16 1983-02-09 Nederlandse Energie Ontwikkeling Maatschappij (Neom) B.V. Complementary device for a heating installation
US4449569A (en) * 1981-03-24 1984-05-22 Exxon Research And Engineering Co. Method and apparatus for regulating fluid flows in parallel-connected conduits (e.g. in furnace installations having air preheaters and by-pass conduits)
FR2510245A1 (en) * 1981-07-24 1983-01-28 Charraudeau Jacques Heat exchanger for gas flow - has one hot and one cold flow with parallel assemblies of folded material inside casing
DE3312260A1 (en) * 1982-04-05 1983-10-06 Robert C Brauer Hot air heating system
US4681153A (en) * 1983-05-31 1987-07-21 Nissan Shatai Company, Limited Automotive air conditioning system with independent temperature control for dual air flows
US4558689A (en) * 1984-06-25 1985-12-17 Mccann Artie Combustion gas heat recovery apparatus
US4928749A (en) * 1985-05-08 1990-05-29 Industrial Energy Corporation Heat exchange recovery method
US4606399A (en) * 1985-07-17 1986-08-19 Heat Extractor, Inc. Heat recovery system with combustion gas accelerator
US5174271A (en) * 1990-10-10 1992-12-29 Samsung Electronics Co., Ltd. Heat exchanger with unitary air intake and exhaust member for an air conditioner
US6167846B1 (en) * 1998-05-14 2001-01-02 Toyota Jidosha Kabushiki Kaisha Catalytic combustion heater
US20090056705A1 (en) * 2007-08-30 2009-03-05 Suncue Company Ltd Combustion system
WO2013149392A1 (en) * 2012-04-05 2013-10-10 Zhu Hongfeng Biomass fuel stove
WO2013149391A1 (en) * 2012-04-05 2013-10-10 Zhu Hongfeng Simulated fireplace using biomass fuel
US20150184861A1 (en) * 2012-04-05 2015-07-02 Hongfeng Zhu Biomass fuel simulation fireplace
US20160177888A1 (en) * 2014-12-19 2016-06-23 Benteler Automobiltechnik Gmbh Exhaust gas heat exchanger
CN105716447A (en) * 2014-12-19 2016-06-29 本特勒尔汽车技术有限公司 Exhaust Gas Heat Exchanger
US9995250B2 (en) * 2014-12-19 2018-06-12 Benteler Automobiltechnik Gmbh Exhaust gas heat exchanger
CN105716447B (en) * 2014-12-19 2019-02-15 本特勒尔汽车技术有限公司 Waste heat exchanger

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CA961849A (en) 1975-01-28

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