US3884292A - Air-o-space heater means for recovering heat from a fluid steam - Google Patents

Air-o-space heater means for recovering heat from a fluid steam Download PDF

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Publication number
US3884292A
US3884292A US372525A US37252573A US3884292A US 3884292 A US3884292 A US 3884292A US 372525 A US372525 A US 372525A US 37252573 A US37252573 A US 37252573A US 3884292 A US3884292 A US 3884292A
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United States
Prior art keywords
heat
stream
fluid
duct
heat pipe
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US372525A
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English (en)
Inventor
Richard L Pessolano
Robin B Rhodes
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Isothermics Inc
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Isothermics Inc
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Publication date
Application filed by Isothermics Inc filed Critical Isothermics Inc
Priority to US372525A priority Critical patent/US3884292A/en
Priority to CA187,895A priority patent/CA990713A/en
Priority to JP49014624A priority patent/JPS5022338A/ja
Priority to FR7415332A priority patent/FR2234535B1/fr
Application granted granted Critical
Publication of US3884292A publication Critical patent/US3884292A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0008—Air heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores

Definitions

  • the present invention constitutes a means for effecl l tuating the partial recovery of heat normally lost 6/l0l through a flue pipe or exhaust stack of a domestic or [51] int. Cl. F28d 15/00 industrial heating system. Use is made of a plurality of Field of Search heat pipes secured in a fixed mutual relationship. Said 237/8, 17; 219/370; 236/1 1, 49; 126/10] plurality-is partially extended into the flue pipe. Heat is axially transferred from the flue pipe and into an air [56] References Cited duct that is equipped with a fan.
  • the fan creates con- UNITED STATES PATENTS vection currents which serve to advance the recovered 1 546 450 7 1925 Meaker 165/179 x heat within the heat duct W ultimately P to either 1 3, 8/1929 the industrial plant or res1dence wherem the recov- 2,092,658 9/1937 ered'heat may be utilized for whatever heating pur- 2,362,940 1 1/1944 pose is desired.
  • a heat pipe is, in its simplest form, a closed container, normally metallic, employing on its inner surface a capillary wick structure which is essentially saturated with the liquid phase of a working field.
  • the capillary structure may be comprised of grooves, of single or multiple layers of wire screen, or of any other suitable system of capillaries capable of moving the liquid-phase working fluid from a condenser or heat sink end of the heat pipe to an evaporator or heat source end.
  • the container is also filled with the vapor of the working fluid, and the container is sealed under a partial vacuum such that the vapor and liquid phases of the working fluid are in equilibrium.
  • the heat pipe transfers heat from one area on the external surface of the container to another area by a vaporizationcondensation cycle.
  • the heat pipe is a totally closed, mechanically static device capable of axially transporting large quantities of heat in an essentially isothermic fashion. In addition it is not dependent upon gravity for its operation.
  • the present invention presents, as will be shown below, a novel use of the heat pipe in order to effect the recovery of heat from a fluid steam and, more particularly, from exhaust gases in residential and industrial heating systems.
  • An object of the present invention is to provide a means for the recovery of heat from waste gases produced by residential and industrial heating processes.
  • Another object is to provide a means of conservation of thermal energy.
  • a yet further object is to provide a means of increasing the efficiency of an otherwise conventional heating system.
  • a further object is to provide a heat recovery means intended to reduce the cost of operationn of conventional heating systems.
  • a fan Enclosed within said second duct is a fan.
  • a source of cool air is received at the intake of said fan and advanced into said second duct, across the condenser ends of said heat pipes.
  • the initially cool air is thereby heated by the thermal energy released at said condenser ends of the heat pipes.
  • This heated air is then convected away from the heat pipes and fed back into the residential or industrial building for any use that may be desired.
  • FIG. 1 is a perspective view of one embodiment of the present invention.
  • FIG. 2 is a perspective schematic view of the present invention inserted into the flue gas exhaust stack of a furnace.
  • FIG. 3 is a cross-sectional schematic view of the present invention.
  • FIG. 3 A generalized schematic view of the concept utilized in the present invention is illustrated in FIG. 3.
  • a hot flue gas ex haust duct 10 can be taken as representative of any hot gas exhaust duct coming from such systems as a furnace, an incinerator, a fossil fuel combustion system, a chemical sytem utilizing an exothermic reaction, or any other heat generating apparatus or system.
  • the duct 10 is to be considered as a generalized hot fluid stream that, in a given instance, one may find exhausting from a residential or industrial structure.
  • the extended portions of the heat pipes 10 will, in most configurations, occupy less than 20 percent of the cross-sectional area of the duct 10. It is to be noted that flue gas temperatures in an oil-fired system can range from 400 F. to 900 F., depending upon the system efficiency as well as upon other factors.
  • Each heat pipe 10 absorbs a portion of this flue gas heat and transmits it through the solid wall 14 and outside of the exhaust duct 10.
  • the wall 14 prevents any of the gases from escaping from the exhaust duct.
  • a fan 18 draws in cool air from the surrounding environment (see FIG. 3) and forces it over the length of the finned heat pipe portion 20. This procedure serves to heat the air within the duct 16, which can then be channelled for use in other areas of a house or plant.
  • the hot air duct 16 can easily be fed into the basement area of a house in order to provide additional warmth thereto and also to decrease the total heat load upon the furnace.
  • a unit of the above described class when utilized in a flue pipe of a conventional residential furnace, can produce a recovered heat output of between 5,000 and 10,000 BTUs.
  • Such a unit may be provided with a thermostat 22 which serves to control the fan 18. All of said components are UL-approved and may be easily installed into a 6-inch T-duct.
  • the unit can be used on steam, hot water and warm air systems and thus will operate with any heating system.
  • a notable feature of the present invention is the ease with which it can be installed, requiring little if any modification of the existing heating system. Once installed, the duct 16 can carry recycled heat to any given area. It will not only dry out dampness and eliminate odors in the basement but will also keep the first level floors more comfortable than they would otherwise be.
  • Another utility of the present heat-recovery system lies in its use with warm air heating systems.
  • the recycled heat can be ducted into the return air intake of the furnace, thereby serving to preheat the air and thus increasing the total system efficiency by bringing more heat (if desired) to all parts of the home.
  • the air coming out of the present heat recovery means 16 is as pure as the air going into the intake side at the fan 18.
  • the design of the present device renders it impossible for contaminated air to be carried with the heat from the stack 10.
  • Said metal barrier 14 seals the stack gases on one side while keeping the newly heated air on the other. Hence, there can be no air flow between the two ducts and 16.
  • first (in duct 10) and second (in duct 16) portions 12 and respectively of the heat pipes may be adjusted in their mutual relative lengths. This is achieved by providing the opening in the wall 14, through which the pipes pass, with an interior threading which is complementary to the exterior threading, or fin structure, of said pipes. Through the rotation of said pipes their axial location can be changed, thus altering the lengths of said first and second portions. Any increase in the length of the first portion 12 will increase the quantity of heat transferred from the duct 10; any decrease in length will reduce the quantity of heat transferred.
  • cool air intake at fin 18 may be equipped with a volumetric flow control.
  • a particularly compelling aspect of the present heat recovery means is its economics: the only expense entailed in the operation of said means derives from the small amount of electricity which is needed to power the fan 18. Not only is no additional fuel required but, as aforestated, heat normally wasted is extracted by the heat pipes and returned into the basic system.
  • the present heat recovery means can increase the efficiency of the heating system by approximately 10 percent. This figure is derived from conventional combustion efficiency measurements. It is believed that the expense saved in fuel alone would defray the retail cost of the present heat recovery means within a few months of installation. After such time the additional recovered heat would represent a complete and total savings to the user.
  • a means for recovering heat from a first fluid stream, said fluid stream having a defined heat content, comprising:
  • a heat pipe having a first portion and a second portion, said first portion extending into said fluid stream;
  • blower control for said second flow stream said blower control serving to maintaining a desired rate of flow of said second flow stream with respect to said second portion of said heat pipe.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US372525A 1973-06-22 1973-06-22 Air-o-space heater means for recovering heat from a fluid steam Expired - Lifetime US3884292A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US372525A US3884292A (en) 1973-06-22 1973-06-22 Air-o-space heater means for recovering heat from a fluid steam
CA187,895A CA990713A (en) 1973-06-22 1973-12-11 Air-o-space heater-means for recovering heat from a fluid stream
JP49014624A JPS5022338A (cs) 1973-06-22 1974-02-06
FR7415332A FR2234535B1 (cs) 1973-06-22 1974-05-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US372525A US3884292A (en) 1973-06-22 1973-06-22 Air-o-space heater means for recovering heat from a fluid steam

Publications (1)

Publication Number Publication Date
US3884292A true US3884292A (en) 1975-05-20

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US372525A Expired - Lifetime US3884292A (en) 1973-06-22 1973-06-22 Air-o-space heater means for recovering heat from a fluid steam

Country Status (4)

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US (1) US3884292A (cs)
JP (1) JPS5022338A (cs)
CA (1) CA990713A (cs)
FR (1) FR2234535B1 (cs)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986665A (en) * 1973-07-07 1976-10-19 J. Eberspacher Heating system for vehicles having an internal combustion engine
US3991936A (en) * 1975-11-26 1976-11-16 Harold Switzgable Heat transfer system
US3993244A (en) * 1975-11-19 1976-11-23 Taylor Don A Heating system
US4037786A (en) * 1975-08-15 1977-07-26 International Telephone And Telegraph Corporation Energy recovery and storage system
US4040477A (en) * 1976-06-17 1977-08-09 Garberick Thayne K Heat recovery apparatus
US4045197A (en) * 1976-09-08 1977-08-30 Ppg Industries, Inc. Glassmaking furnace employing heat pipes for preheating glass batch
US4078602A (en) * 1976-12-17 1978-03-14 Olla Enterprises, Inc. Heat exchanger for recovering waste heat
US4092140A (en) * 1976-09-08 1978-05-30 Ppg Industries, Inc. Apparatus and method using heat pipes for manipulating temperature gradients in a glass forming chamber
JPS5372255A (en) * 1976-12-10 1978-06-27 Toyo Seisakusho Kk Selfffuming prevention method using heat tube
US4182306A (en) * 1977-12-27 1980-01-08 Tomich John L Heat transfer device
US4184861A (en) * 1978-07-13 1980-01-22 Owens-Corning Fiberglas Corporation Energy efficient apparatus and process for manufacture of glass
WO1980001510A1 (fr) * 1979-01-10 1980-07-24 Gadelius K Echangeur de chaleur tubulaire du type rotatif
US4219073A (en) * 1978-01-16 1980-08-26 Arthur C. Salvatore, Jr. Heat saver device
US4249594A (en) * 1979-02-28 1981-02-10 Southern California Gas Company High efficiency furnace
US4275510A (en) * 1979-06-01 1981-06-30 George Odean F Heat recovery in a laundry system
US4303122A (en) * 1979-08-16 1981-12-01 Entec Products Corporation Flue heat recovery device
EP0032523A3 (en) * 1979-12-22 1982-04-07 Mannesmann Demag Ag Process and device for recovering and reutilizing heat from hot gases, especially from the exhaust gases of metallurgical processes and the use of this process
US4333524A (en) * 1979-02-28 1982-06-08 Southern California Gas Company High efficiency furnace
US4342639A (en) * 1980-07-22 1982-08-03 Gagon Hugh W Process to separate bituminous material from sand (Tar Sands)
US4363353A (en) * 1980-08-08 1982-12-14 Pranaitis Ronald B Exhaust pipe heat exchanger
US5097531A (en) * 1986-08-15 1992-03-17 Clover Electronica Limitada Apparatus for the oxidation of particles suspended in the air
US5462111A (en) * 1993-03-29 1995-10-31 The Boc Group Plc Cooling apparatus
FR2792681A1 (fr) * 1999-04-21 2000-10-27 Anghel Muscocea Dispositif antipollution pour vehicule a moteur et cheminee industrielle
US20050086832A1 (en) * 2003-10-28 2005-04-28 Michel Declos Air heater
US20050263266A1 (en) * 2004-05-27 2005-12-01 Lg Electronics Inc. Ventilator
US20090151920A1 (en) * 2007-12-18 2009-06-18 Ppg Industries Ohio, Inc. Heat pipes and use of heat pipes in furnace exhaust
US20110271948A1 (en) * 2009-01-09 2011-11-10 Simon Redford Apparatus for capturing heat from a stove
GB2503781A (en) * 2012-05-30 2014-01-08 Clk Corp Hybrid heat pump boiler system
US20140007447A1 (en) * 2011-03-16 2014-01-09 Shanghai Fubo Environmental Equipment Co., Ltd. Sludge drying system
US20140131010A1 (en) * 2012-11-12 2014-05-15 Exxonmobil Research And Engineering Company Condensing air preheater with heat pipes
DE102013219801A1 (de) * 2013-09-30 2015-04-02 Bayerische Motoren Werke Aktiengesellschaft Kühlelement und Abgasanlage, umfassend ein Kühlelement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52155461A (en) * 1976-06-19 1977-12-23 Tokico Ltd Heat exchanger
DE2726103C2 (de) * 1977-06-10 1984-11-29 Vdo Adolf Schindling Ag, 6000 Frankfurt Einrichtung zum Anzeigen der Geschwindigkeitsänderung eines Schiffes
FR2552866A1 (fr) * 1982-12-01 1985-04-05 Baudelet Guy Dispositif de recuperation d'energie adaptable sur tous conduits d'air chaud de fumees ou de vapeur

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546450A (en) * 1924-03-26 1925-07-21 John W Meaker Furnace
US1725906A (en) * 1927-07-05 1929-08-27 Frazer W Gay Heat transfer means
US2092658A (en) * 1936-01-25 1937-09-07 Radiator Specialty Company Water heater
US2362940A (en) * 1942-04-08 1944-11-14 Roy P Skerritt Control for fuel economizers
US2529915A (en) * 1945-08-03 1950-11-14 Chausson Usines Sa Heating and antifreezing apparatus for aircraft
US3417227A (en) * 1966-04-04 1968-12-17 Internat Oil Burner Company Undercabinet electric space heater unit
US3779310A (en) * 1971-04-05 1973-12-18 G Russell High efficiency heat transit system
US3788388A (en) * 1971-02-19 1974-01-29 Q Dot Corp Heat exchange system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2153942A (en) * 1937-02-03 1939-04-11 Jr Jack J Spalding Heat exchanging apparatus
US3602429A (en) * 1968-11-04 1971-08-31 Isotopes Inc Valved heat pipe
CA969534A (en) * 1969-05-14 1975-06-17 Q-Dot Corporation Heat exchange system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1546450A (en) * 1924-03-26 1925-07-21 John W Meaker Furnace
US1725906A (en) * 1927-07-05 1929-08-27 Frazer W Gay Heat transfer means
US2092658A (en) * 1936-01-25 1937-09-07 Radiator Specialty Company Water heater
US2362940A (en) * 1942-04-08 1944-11-14 Roy P Skerritt Control for fuel economizers
US2529915A (en) * 1945-08-03 1950-11-14 Chausson Usines Sa Heating and antifreezing apparatus for aircraft
US3417227A (en) * 1966-04-04 1968-12-17 Internat Oil Burner Company Undercabinet electric space heater unit
US3788388A (en) * 1971-02-19 1974-01-29 Q Dot Corp Heat exchange system
US3779310A (en) * 1971-04-05 1973-12-18 G Russell High efficiency heat transit system

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986665A (en) * 1973-07-07 1976-10-19 J. Eberspacher Heating system for vehicles having an internal combustion engine
US4037786A (en) * 1975-08-15 1977-07-26 International Telephone And Telegraph Corporation Energy recovery and storage system
US3993244A (en) * 1975-11-19 1976-11-23 Taylor Don A Heating system
US3991936A (en) * 1975-11-26 1976-11-16 Harold Switzgable Heat transfer system
US4040477A (en) * 1976-06-17 1977-08-09 Garberick Thayne K Heat recovery apparatus
US4092140A (en) * 1976-09-08 1978-05-30 Ppg Industries, Inc. Apparatus and method using heat pipes for manipulating temperature gradients in a glass forming chamber
US4045197A (en) * 1976-09-08 1977-08-30 Ppg Industries, Inc. Glassmaking furnace employing heat pipes for preheating glass batch
JPS5372255A (en) * 1976-12-10 1978-06-27 Toyo Seisakusho Kk Selfffuming prevention method using heat tube
US4078602A (en) * 1976-12-17 1978-03-14 Olla Enterprises, Inc. Heat exchanger for recovering waste heat
US4182306A (en) * 1977-12-27 1980-01-08 Tomich John L Heat transfer device
US4219073A (en) * 1978-01-16 1980-08-26 Arthur C. Salvatore, Jr. Heat saver device
US4184861A (en) * 1978-07-13 1980-01-22 Owens-Corning Fiberglas Corporation Energy efficient apparatus and process for manufacture of glass
WO1980001510A1 (fr) * 1979-01-10 1980-07-24 Gadelius K Echangeur de chaleur tubulaire du type rotatif
US4333524A (en) * 1979-02-28 1982-06-08 Southern California Gas Company High efficiency furnace
US4249594A (en) * 1979-02-28 1981-02-10 Southern California Gas Company High efficiency furnace
US4275510A (en) * 1979-06-01 1981-06-30 George Odean F Heat recovery in a laundry system
US4303122A (en) * 1979-08-16 1981-12-01 Entec Products Corporation Flue heat recovery device
EP0032523A3 (en) * 1979-12-22 1982-04-07 Mannesmann Demag Ag Process and device for recovering and reutilizing heat from hot gases, especially from the exhaust gases of metallurgical processes and the use of this process
US4434004A (en) 1979-12-22 1984-02-28 Mannesmann Demag Ag Method for recovery and recycling of heat from hot gases in metallurigical processing
US4342639A (en) * 1980-07-22 1982-08-03 Gagon Hugh W Process to separate bituminous material from sand (Tar Sands)
US4363353A (en) * 1980-08-08 1982-12-14 Pranaitis Ronald B Exhaust pipe heat exchanger
US5097531A (en) * 1986-08-15 1992-03-17 Clover Electronica Limitada Apparatus for the oxidation of particles suspended in the air
US5462111A (en) * 1993-03-29 1995-10-31 The Boc Group Plc Cooling apparatus
FR2792681A1 (fr) * 1999-04-21 2000-10-27 Anghel Muscocea Dispositif antipollution pour vehicule a moteur et cheminee industrielle
US20050086832A1 (en) * 2003-10-28 2005-04-28 Michel Declos Air heater
US7322401B2 (en) * 2004-05-27 2008-01-29 Lg Electronics Inc. Ventilator
US20050263266A1 (en) * 2004-05-27 2005-12-01 Lg Electronics Inc. Ventilator
US20090151920A1 (en) * 2007-12-18 2009-06-18 Ppg Industries Ohio, Inc. Heat pipes and use of heat pipes in furnace exhaust
US7856949B2 (en) * 2007-12-18 2010-12-28 Ppg Industries Ohio, Inc. Heat pipes and use of heat pipes in furnace exhaust
US20110271948A1 (en) * 2009-01-09 2011-11-10 Simon Redford Apparatus for capturing heat from a stove
US20140007447A1 (en) * 2011-03-16 2014-01-09 Shanghai Fubo Environmental Equipment Co., Ltd. Sludge drying system
GB2503781A (en) * 2012-05-30 2014-01-08 Clk Corp Hybrid heat pump boiler system
GB2503781B (en) * 2012-05-30 2015-11-11 Clk Corp Hybrid heat pump boiler system
US20140131010A1 (en) * 2012-11-12 2014-05-15 Exxonmobil Research And Engineering Company Condensing air preheater with heat pipes
DE102013219801A1 (de) * 2013-09-30 2015-04-02 Bayerische Motoren Werke Aktiengesellschaft Kühlelement und Abgasanlage, umfassend ein Kühlelement

Also Published As

Publication number Publication date
FR2234535B1 (cs) 1976-12-17
JPS5022338A (cs) 1975-03-10
CA990713A (en) 1976-06-08
FR2234535A1 (cs) 1975-01-17

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