EP1058804B1 - Appareil de chauffage d'eau/glycol alimente au gaz, place a l'exterieur - Google Patents

Appareil de chauffage d'eau/glycol alimente au gaz, place a l'exterieur Download PDF

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Publication number
EP1058804B1
EP1058804B1 EP98905178A EP98905178A EP1058804B1 EP 1058804 B1 EP1058804 B1 EP 1058804B1 EP 98905178 A EP98905178 A EP 98905178A EP 98905178 A EP98905178 A EP 98905178A EP 1058804 B1 EP1058804 B1 EP 1058804B1
Authority
EP
European Patent Office
Prior art keywords
housing
gas
fired heater
heater
air
Prior art date
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
Application number
EP98905178A
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German (de)
English (en)
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EP1058804A1 (fr
Inventor
Charles Cote
Henry Nachaj
Kébir Ratnani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gaz Metro LP
Original Assignee
CT DES TECHNOLOGIES DU GAZ NAT
Centre des Technologies du Gaz Naturel
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Filing date
Publication date
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Publication of EP1058804A1 publication Critical patent/EP1058804A1/fr
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Publication of EP1058804B1 publication Critical patent/EP1058804B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/142—Connecting hydraulic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/148—Arrangements of boiler components on a frame or within a casing to build the fluid heater, e.g. boiler

Definitions

  • the present invention relates to an external compact gas-fired heater and particularly, but not exclusively, incorporating a natural gas heater for heating a water/glycol fluid and wherein the heater is provided within a housing which precludes unauthorized access thereto and still further wherein the heater is easy to repair or replace.
  • Heating devices for heating homes or small buildings having heating capacities of from about 20,500 Watt to about 44,000 Watt are usually mounted internally of such buildings and such have inherent disadvantages.
  • the furnace or heater occupies interior space in the building and often a specific furnace room has to be provided for security. It is also necessary to have a fresh air duct connected to such furnace and this often results in excessive cold air intrusion within the building, as the air duct must penetrate the outside wall of the building. These heaters or furnaces also generate noise and release gas or oil scent within the building. It is also necessary to construct a chimney to evacuate the combustion products from the furnace, and if there are leaks in the piping which connects the furnace to the chimney, then this could cause serious health problems to the occupants of the building.
  • US-A-4,893,609 discloses an outdoor gas-fired heater for heating a fluid for use as a heat exchange medium.
  • the heater has an inlet opening for air, a channel for guiding air to a burner disposed in the heater and an exhaust opening for flue products. But, such a furnace is often difficult to repair or replace.
  • Another feature of the present invention is to provide an external gas-fired heater which is secured externally of a building to be heated and which is easy to service, repair and replace.
  • Another feature of the present invention is to provide an external gas-fired heater which has an efficiency superior to 83% and a low NO X emission inferior to 30 ppm at 3% of O 2 .
  • Another feature of the present invention is to provide an external gas-fired heater which is easy to use and which has an esthetically pleasing design.
  • Another feature of the present invention is to provide an external gas-fired heater which is safe for children and access to which is provided only to authorized people.
  • Another feature of the present invention is to provide an external natural gas-fired heater for heating a water/glycol fluid to produce a heat exchange medium to feed heat exchange devices located inside a building to be heated by the heater.
  • the present invention provides an external gas-fired heater for heating a fluid for use as a heat exchange medium.
  • the heater comprises a housing securable outside a building to which heated fluid is to be supplied for heat exchange in heating devices contained within said building.
  • a heating coil is supported in the housing and through which is convected the fluid.
  • a combustion chamber contains the heating coil.
  • a cylindrical gas burner is disposed inside the coil to heat the coil and the fluid.
  • An air/gas mixing blower is connected to the gas burner to feed a combustible air/gas mixture thereto.
  • Exhaust means is provided to evacuate flue gases from the combustion chamber to atmosphere.
  • An ignitor is provided to ignite the air/gas mixture at the gas burner.
  • a flame detector is provided to detect a flame at the gas burner.
  • the housing has an access panel to permit access to the interior of the housing.
  • Lock means secures the panel to the housing.
  • Convection means provides air circulation inside the housing.
  • Coupling means permit use of installation and removal of the housing or equipment therein.
  • Fig. 1 there is shown generally at 10 the external natural gas-fired heater of the present invention housed within a housing 11 which is secured to the wall 12 of a building or roof unit.
  • the housing 11 is a rectangular housing provided with a detachable cover 13 which forms the front wall 13' and top wall 13" of the housing whereby to provide access to the component parts of the heater and to provide security.
  • Feed pipe 14 supplies the natural gas to the internal burner, as will be described later, and pipes 15 provide circulation of a heated liquid to the building for heat exchange with heaters (not shown) provided therein.
  • a thermally insulated combustion chamber 16 is secured in an upper portion of the housing 11 and has a heating coil 17 mounted therein.
  • the heating coil is comprised of two concentrically disposed spiral coils 17' and 17" of heat conductive material, and which are serially connected to one another, and have an inlet 18 and an outlet 19 through which a water/glycol mixture is circulated by a pump 20.
  • a temperature and pressure gauge 21 monitors the glycol solution at the outlet of the coil.
  • a cylindrical natural gas burner nozzle 22 is supported concentrically at the center of the heating coil 17 and is supplied a natural gas/air mixture by the mixing blower 23 to heat the spiral coil 17', 17", and hence the water/glycol liquid solution circulated therethrough.
  • this solution is a 50/50 mixture.
  • other suitable solutions may be used, but it has been found that the particular glycol/water mixture provides for the mixture to be operational from about -40°C to about 82°C making it ideal for harsh northern climates.
  • An ignitor 24 ignites the cylindrical burner 22 and a flame is detected by a flame detecting probe 25 mounted adjacent the burner 22. Controls for these are provided on a control panel 45.
  • the combustion chamber 16 is delimited by a thermally insulated cylindrical metal container 26 having a bottom wall and on which is disposed a bottom circular refractory disc 27.
  • a top refractory disc 28 is disposed over the heating coil 17 to reduce heat loss from the container and to increase the exchange efficiency of the heater.
  • a top wall 29 is secured over the top end 26' of the cylindrical container 26.
  • the refractory disc 28 is a solid disc to force the flue gas through the heating coil spirals and up above the disc 28 periphery and then through the evacuating portion of the wall 29.
  • the flue gases which are convected through the port 29' is directed into an exhaust duct which, as shown in Fig. 5, is constituted by an intake pipe 30 which interconnects the port 29' to an exhaust conduit 31 which extends through the housing 11 from a top end to a bottom wall 11' of the housing.
  • the outlet end 32 of the exhaust pipe 31 communicates the flue gases to atmosphere through an orifice 33 provided in the bottom wall 11'.
  • This exhaust pipe 31 also pre-heats air within the housing to feed warm air to the mixing blower 23 to increase the efficiency of the combustion mixture thereof.
  • Fig. 6 illustrates an alternative embodiment of the exhaust conduit for use in less cold climatic regions and, as herein shown, it may be provided by an intake pipe 34 secured about the port 29' of the top wall 29 of the combustion chamber, and having diametrically opposed exhaust ducts 35 to release the combustion products from the opposed sides of the top wall 13" of the cover 13.
  • the top wall has notches 36 on opposed side walls 37 thereof to accommodate the ducts 35.
  • the various component parts of the heater are individually removably secured within the housing 11 by individual attachment brackets, such as bracket 38 and quick connectors 39, to permit the entire housing and its component parts and wiring to be removed in a very short period of time for replacement and/or for servicing elsewhere than on site if need be.
  • These quick connectors connect the gas pipes and heating fluid pipes.
  • the gas pipe feeds a gas valve 40 and an interchangeable orifice plate 41 regulates the amount of gas which is fed to the blower 23 for admixture with air.
  • the gas supply and orifice plate are connected to blower 23 by an orifice plate 41'.
  • a pressure control switch 42 and a temperature limiting probe 43 are secured to the heated fluid pipes 15, 15'.
  • An air/gas mixture control 47 is provided on the control panel 45, and this control panel is mounted internally of the housing 11 and is accessible only to authorized personnel who have access to the key lock 50.
  • the housing 11 is a rectangular housing having an L-shaped removably detachable cover 13.
  • the front wall 13' of the cover 13, in a lower inner section thereof, is provided with a spaced internal metal wall 53 to form a narrow convection passage 54 to feed air internally of said housing adjacent the top end of the cover, as shown in Fig. 1.
  • Access holes 56 are punched in the bottom wall 11' of the housing to accommodate the necessary piping and wiring.
  • the heater as above described, has a heating capacity from about 8'8 to 58'6 kw (30,000 to 200,000 Btu/h) and is easily adjustable by interchanging the orifice plate 41 to deliver the required heat capacity within that range.
  • the housing 11 is also mounted on an exterior wall of a building to which the hot water/glycol solution is to be fed.
  • Fig. 8 shows a typical embodiment wherein the heater 10 is mounted on the roof of a building.
  • the feed line 15 of the water/glycol solution is fed to a heat exchange device 60 located inside the duct work 61 and through which air is circulated to heat the air.
  • An expansion valve 63 is connected in the line 15.
  • a mixing valve 64 is also secured to the fluid pipe 15 to prevent passage of cold water/glycol solution.
  • the hot glycol solution is circulated through the heat exchange coil 60 where it cools and is then returned to the heating coil 17 through the return pipe 15'.
  • the advantage of the heater being mounted externally of the housing results in a saving of space within the building and the air supply for the heater is taken directly from the outside air.
  • the noise generated by the heater is located outside the building and the gases are evacuated directly to the atmosphere, thus avoiding the necessity of building a chimney.
  • Such a heater can also be utilized to replace existing electric heaters by natural gas heaters. The heater is also easy to operate and provides of ease of maintenance.
  • the efficiency of the heater of this invention is superior to 83% and that the NO x emission is inferior to 30 ppm at 3% O 2 .
  • the construction of the heater housing is also aesthetically pleasing to the eye and provides added safety by locking the heater components inside a housing which is accessible to authorized persons only. Because the housing is wall-mounted, such as on support brackets 11" as shown in Fig. 3, it can be secured at a convenient height for maintenance and above the snow line to provide ease of service in winter.
  • the heater of the present invention also results in a reduction in cost of operation as compared to electricity. It also provides a more compact housing than competitive heaters. It may also be used to heat water or swimming pools, radiant floors, radiators and a multitude of other devices or may have other uses.
  • the external gas-fired heater of the present invention has a jacket heat loss of only about 2%. It is also feasible to utilize the gas-fired heater for applications in buildings having three rooms only or to triplex-type buildings where there may be 15 to 20 rooms.
  • the units can also be fabricated in different sizes to supply from about 8.8 kw to 58.6 kw or from 11.7 kw to about 58.6 kw.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Claims (10)

  1. Appareil extérieur de chauffage au gaz compact (10), pour chauffer un fluide destiné à servir de milieu d'échange de chaleur, ledit milieu d'échange de chaleur opérant dans une gamme de températures comprise entre environ -40°C et environ 82°C pour fournir une puissance de chauffe comprise entre environ 8 800 Watt et environ 58 600 Watt, ledit appareil de chauffage comprenant:
    un logement rectangulaire (11) fixable à l'extérieur d'un immeuble (12) auquel un fluide à chauffer est distribué, chauffé et alimenté en tant que source de chaleur de dispositifs de chauffage (60) contenus à l'intérieur de l'immeuble ; ledit logement présentant :
    une trappe d'accès pour permettre un accès complet à l'intérieur dudit logement (11),
    des moyens de verrouillage (50) pour faciliter le maintien et le retrait de ladite trappe d'accès audit logement (11), et
    des moyens de convection (54) pour générer une circulation d'air à l'intérieur dudit logement (11),
    des moyens d'attache pour permettre une mise en place et un retrait aisés dudit appareil extérieur de chauffage au gaz compact (10),
    des composants comprenant :
    un enroulement de chauffage (17) supporté dans ledit logement (11) à travers lequel ledit fluide circule,
    un boítier cylindrique (26) thermiquement isolé présentant des parois circulaires supérieure (29) et inférieure en matériau réfractaire et comprenant une chambre de combustion cylindrique (16), ladite chambre de combustion (16) contenant ledit enroulement de chauffage (17),
    un brûleur (22) cylindrique à gaz disposé à l'intérieur dudit enroulement (17) pour chauffer ledit enroulement (17) et ledit fluide,
    un ventilateur (23) pour souffler un mélange air/gaz relié audit brûleur à gaz pour l'alimenter en mélange combustible air/gaz, afin de maintenir une flamme stable en présence de conditions climatiques ambiantes,
    un échappement maintenu sur la paroi supérieure (29) dudit boítier (26) et muni de moyens d'échappement (31 ; 35) pour évacuer lesdites fumées de ladite chambre de combustion (16) vers l'atmosphère à l'extérieur dudit logement (11),
    des moyens d'allumage (24) pour enflammer ledit mélange air/gaz à l'endroit dudit brûleur à gaz,
    un détecteur de flamme (25) pour détecter une flamme à l'endroit du brûleur à gaz,
    dans lequel :
    ladite trappe d'accès forme un couvercle (13) pour ledit logement (13) et constitue des parois frontale (13') et supérieure (13") dudit logement (11), et l'appareil extérieur de chauffage au gaz compact (10) comprend en outre des moyens de fixation (38, 39) accessibles depuis des zones frontale et supérieure (13', 13") dudit logement (11) quand ladite trappe (13) est retirée, lesdits moyens de fixation (38, 39) maintenant de manière amovible lesdits composants à l'intérieur dudit logement (11).
  2. Appareil extérieur de chauffage au gaz selon la revendication 1, dans lequel ledit milieu d'échange de chaleur est une solution liquide d'eau et de glycol.
  3. Appareil extérieur de chauffage au gaz selon la revendication 2, dans lequel ladite solution liquide d'eau et de glycol est un mélange à sensiblement 50/50 d'eau et de glycol.
  4. Appareil extérieur de chauffage au gaz selon l'une quelconque des revendications précédentes, dans lequel lesdits moyens de verrouillage (50) sont un cylindre de verrouillage à clé (52) agissant sur un élément de verrouillage (51) pour maintenir ladite trappe d'accès par rapport audit logement (11).
  5. Appareil extérieur de chauffage au gaz selon l'une quelconque des revendications précédentes, dans lequel lesdits moyens d'échappement comprennent un conduit d'échappement (31) ayant une extrémité d'entrée maintenue sur la paroi supérieure (29') dudit boítier (26) et une extrémité de sortie maintenue sur une paroi (11') dudit logement pour évacuer lesdites fumées dans l'atmosphère à l'extérieur dudit logement (11), ledit conduit d'échappement (31) s'étendant à l'intérieur dudit conduit (11) pour chauffer l'air à l'intérieur dudit logement (11) au moins dans la zone dudit ventilateur de mélange (23) et ainsi alimenter le ventilateur de mixage (23) en air préchaufé pour favoriser la combustion dudit mélange air /gaz.
  6. Appareil de chauffage à gaz selon l'une quelconque des revendications précédentes, dans lequel ledit enroulement de chauffage (17) est un enroulement hélicoïdal présentant une pluralité d'hélices (17', 17"), ledit enroulement présentant une extrémité d'entrée (18) et une extrémité de sortie (19), lesdits moyens d'attache comprenant un connecteur de type attache rapide maintenu auxdites extrémités d'entrée et de sortie (18, 19).
  7. Appareil de chauffage à gaz selon la revendication 6, dans lequel ledit enroulement de chauffage (17) comprend deux enroulements hélicoïdaux (17', 17") disposés concentriquement et connectés en série.
  8. Appareil de chauffage à gaz selon l'une quelconque des revendications précédentes, dans lequel lesdits moyens de convection (54) sont constituées par une section de la trappe, deux tôles métalliques (13' ; 53) formant canal de convection dans une partie frontale inférieure de ladite trappe.
  9. Appareil de chauffage à gaz selon la revendication 8, dans lequel lesdits moyens de convection (54) sont formés par ladite paroi frontale (13') de ladite trappe.
  10. Appareil de chauffage à gaz selon l'une quelconque des revendications précédentes, dans lequel le brûleur à gaz est un brûleur de gaz naturel, lesdites fumées émettant moins d'environ 30 ppm de NOx à 3% de O2.
EP98905178A 1998-02-24 1998-02-24 Appareil de chauffage d'eau/glycol alimente au gaz, place a l'exterieur Expired - Lifetime EP1058804B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1998/000155 WO1999043993A1 (fr) 1998-02-24 1998-02-24 Appareil de chauffage d'eau/glycol alimente au gaz, place a l'exterieur

Publications (2)

Publication Number Publication Date
EP1058804A1 EP1058804A1 (fr) 2000-12-13
EP1058804B1 true EP1058804B1 (fr) 2002-11-13

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EP98905178A Expired - Lifetime EP1058804B1 (fr) 1998-02-24 1998-02-24 Appareil de chauffage d'eau/glycol alimente au gaz, place a l'exterieur

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Country Link
EP (1) EP1058804B1 (fr)
AU (1) AU6085498A (fr)
TR (1) TR200002540T2 (fr)
WO (1) WO1999043993A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1132692A3 (fr) * 2000-03-10 2003-01-22 Comercial Caravaning, S.C. Chauffe-eau instantané à gaz pour caravane
DE102017210150A1 (de) * 2017-06-19 2018-12-20 Robert Bosch Gmbh System zur Energiebereitstellung und/oder Ventilation eines Gebäudes sowie ein Gehäuse
CN109579280A (zh) * 2018-12-28 2019-04-05 广东顺德大派电气有限公司 一种自适应燃气热水器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3165113D1 (en) * 1980-11-07 1984-08-30 Sdecc Boiler with sealed combustion chamber and cylindric heat exchanger
FR2502755A1 (fr) * 1981-03-30 1982-10-01 Piquet Jean Appareil electrique de chauffage d'eau ou d'autre fluide caloporteur notamment pour installation de chauffage central a circulation de fluide
US4762384A (en) * 1985-04-29 1988-08-09 American Telephone And Telegraph Company, At&T Bell Laboratories Optical systems with antireciprocal polarization rotators
US4893609A (en) * 1986-09-26 1990-01-16 Teledyne Industries, Inc. Wind-resistant outdoor heating appliance
US4852963A (en) * 1987-06-30 1989-08-01 American Telephone And Telegraph Company, At&T Bell Laboratories Optical fiber biconic connector
US5020721A (en) * 1989-09-19 1991-06-04 Gas Fired Products Rapid recovery gas hot water heater
US5516278A (en) * 1995-03-08 1996-05-14 Aos Holding Company Forced draft mixer and burner assembly with pressure distribution device

Also Published As

Publication number Publication date
EP1058804A1 (fr) 2000-12-13
AU6085498A (en) 1999-09-15
TR200002540T2 (tr) 2001-01-22
WO1999043993A1 (fr) 1999-09-02

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