EP2410258A1 - Space heater of the ventilation type - Google Patents

Space heater of the ventilation type Download PDF

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Publication number
EP2410258A1
EP2410258A1 EP20110174684 EP11174684A EP2410258A1 EP 2410258 A1 EP2410258 A1 EP 2410258A1 EP 20110174684 EP20110174684 EP 20110174684 EP 11174684 A EP11174684 A EP 11174684A EP 2410258 A1 EP2410258 A1 EP 2410258A1
Authority
EP
European Patent Office
Prior art keywords
chamber
exchanger body
air
heating
casing
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.)
Withdrawn
Application number
EP20110174684
Other languages
German (de)
English (en)
French (fr)
Inventor
Alvise Cornolo'
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.)
Cogas Italy Srl
Original Assignee
Cogas Italy Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cogas Italy Srl filed Critical Cogas Italy Srl
Publication of EP2410258A1 publication Critical patent/EP2410258A1/en
Withdrawn legal-status Critical Current

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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
    • F24H9/0052—Details for air heaters
    • F24H9/0057—Guiding means
    • F24H9/0063—Guiding means in air channels
    • 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/065—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators using fluid fuel
    • 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
    • F24H9/0084—Combustion air preheating

Definitions

  • the present invention relates to a space heater of the ventilation type.
  • wall-mounted gas-powered fan coil units which are constituted by a burner assembly facing toward a combustion chamber followed by a labyrinth-like heat exchange duct, adapted to the thermal dissipation of the heat of the gases produced by the combustion in outflow toward the exhaust.
  • the heat exchange duct and the combustion chamber are externally finned in order to boost the thermal exchange with the air that flows over them externally.
  • a fan is arranged outside the dissipator conduit and outside the combustion chamber, near the latter, in order to strike it with a flow of air drawn from the space to be heated and destined to be reintroduced back into the space after having flowed over the combustion chamber and the heat exchange duct, thus heating up.
  • the burner assembly, the combustion chamber, the heat exchange duct and the fan are enclosed in a casing provided with ventilation windows adapted to allow an easy aspiration and rejection of the air to be recirculated in the space to be heated.
  • the fan is of the drum type, with vanes curved forward, in order to provide a high flow of air with a low pressure increase, thus exhibiting a reduced encumbrance compared to other types of fan.
  • Another need that is becoming more and more of a priority is the need to reduce the pollutant substances introduced into the environment by the exhaust gases, by promoting a complete and correct combustion of the fuel/ oxidizer mixtures.
  • the aim of the present invention is to provide an air-circulation space heating device that makes it possible to achieve thermal exchange efficiencies that are higher than the fan coil units known today.
  • an object of the invention is to provide a heating device that makes it possible to prevent the formation of nitrogen oxides.
  • Another object of the invention is to provide a heating device that exhibits a lower environmental impact than the fan coil units known today.
  • Another object of the invention is to provide a heating device that is quieter in operation than the fan coil units known today.
  • Another object of the invention is to provide a heating device that is longer lasting than the fan coil units known today.
  • Another object of the invention is to provide a heating device that is structurally simple and easy to use, and which can be implemented at low cost.
  • a space heater of the ventilation type characterized in that it comprises a casing and an exchanger body which encloses a combustion chamber and is at least partially internal to said casing, said casing enclosing, below said exchanger body, a heating pre-chamber for the air to be heated, which opens onto a heating chamber arranged above it, said heating chamber being defined between said casing and said exchanger body, there being provided means for aspirating the air from the outside of said casing into said heating pre-chamber and a burner assembly, which is connected in a lower portion to said exchanger body in order to be cooled by ventilation by said suction means.
  • the reference numeral 10 generally designates a space heater of the ventilation type, which, according to the invention, has a peculiarity in that it comprises a casing 11 and an exchanger body 12 that encloses a combustion chamber 13 by defining it internally.
  • the exchanger body 12 is inside the casing 11, this enclosing, below the exchanger body 12, a heating pre-chamber 14, for the air to be heated, which opens onto a heating chamber 15 for the air to be heated, arranged above it.
  • the heating chamber 15 is defined between the casing 11 and the exchanger body 12, means 16 being provided, preferably in the heating pre-chamber 14, for aspirating the air from the outside of the casing 11 into the heating pre-chamber 14 and a burner assembly 17, which is connected in a lower portion to the exchanger body 12 in order to be cooled by ventilation by the suction means 16.
  • the exchanger body is at least partially inside the casing 11.
  • the casing 11 is substantially column-shaped and accommodates, in a portion thereof which is the upper one during use 18, the exchanger body 12, the heating chamber 15 being defined as an interspace between the upper portion 18 and the exchanger body 12.
  • the upper portion 18 is conveniently open in an upper portion, being conveniently provided with windows 19 to discharge the air that during use flows out of the heating chamber 15.
  • the exchanger body 12 is preferably surrounded by the upper portion 18 of the casing 11, the heating chamber 15 being annular with respect to the exchanger body 12.
  • the particular column shape, wherein the exchanger body 12 is central to the heating chamber 15 and inside the casing 11 so as to be, during use, conveniently completely surrounded by the air to be heated which flows over it, makes it possible to make the combustion chamber 13 wide so as to obtain a mixture of the gas combusting with the oxidizing air that is more effective than the devices known today, furthermore enabling the temperature of combustion to be kept relatively low so as to prevent or limit the formation of NO x while still achieving high coefficients of thermal exchange between the exchanger body 12 and the air to be heated by means of the surface of the exchanger body 12 exposed thereto, which increases, virtuously, with the increase in size of the combustion chamber designed.
  • the exchanger body 12 is provided with external fins 20 protruding into the heating chamber 15, in order to achieve a more efficient thermal exchange.
  • the fins 20 are preferably further provided with openings 21 and deflector flaps 22 adapted to impart to the air that flows over them a turbulent and vortical motion around the exchanger body 12.
  • the exchanger body 12 has an inner dividing wall 23 which defines
  • the casing 11 conveniently has a bottom 26 which delimits, below the heating pre-chamber 14, a suction chamber 27, which is open perimetrically in order to draw air from the surrounding environment, for example by having perimetric slits 28.
  • the bottom 26 conveniently has a port 29 for the passage of air from the suction chamber 27 to the heating pre-chamber 14, the suction means 16 being connected to the port 29 in order to force the passage of air through it, during use.
  • the suction means 16 comprise a centrifugal fan 30 of the type with vanes curved backward, which furthermore is quieter than the drum fans used in the fan coil units known today.
  • a device 31 is conveniently provided for controlling the burner assembly 17 and the suction means 16, to which it is connected in order to modulate the heating thermal power produced by the heating device 10, selectively according to a predefined program or a command of an operator.
  • control device 31 can comprise an inverter to actuate the motor 32 of the centrifugal fan 30 in order to modulate its rotation torque as a function of the flow and pressure of air to be heated by passing through the heating chamber 15.
  • the control device 31 is preferably accommodated in the suction chamber 27 in order to be cooled by the air sucked through it during use.
  • the burner assembly 17 conveniently comprises a pre-mixer of combustible gas with combustion air, of a type that is known per se and not shown in the accompanying figures.
  • the burner assembly 17 is preferably connected hermetically to a duct 33 for aspirating the combustion air, and the exchanger body 12 is connected hermetically to a duct 34 for discharging the exhaust gases.
  • the discharge duct 34 conveniently has a heat-sink portion 34a that passes through the heating chamber 15.
  • the exchanger body is provided with an internal set of fins which protrudes at least into the heat recovery chamber to exchange heat between the exhaust gases that flow therein and the air that flows in the heating chamber, during use.
  • Such set of fins can, according to the contingent requirements, for example extend vertically and helically in the heat recovery chamber.
  • the discharge duct 34 conveniently comprises a terminal 35 that is open inside the casing 11, and specifically in the heating chamber 15.
  • the terminal 35 conveniently extends in the opposite direction to the flow of the air being heated A in the heating chamber 15, illustrated for the purposes of non-limiting example in Figure 3 with an arrow with an undulating line.
  • the terminal 35 has openings 36 that are covered by a deflector 37 that is adapted to deflect, in the same direction as the direction of flow of the air being heated A, the combustion gases B, illustrated for the purposes of example in Figure 3 with arrows with dotted lines.
  • the control device 31 commands the suction means 16 to draw air from the surrounding environment, passing through the slits 28, then the suction chamber 27 and the centrifugal fan 30, from which it is sucked through the port 29 and introduced into the heating pre-chamber 14 thus giving it a pressure that is adapted to determine the flow required for the programmed thermal heating power.
  • control device actuates the burner assembly 17, adapting the flow of combustible gas and of oxidizing air to be introduced for combustion into the combustion chamber 13 to the aforementioned programmed thermal power.
  • the air to be heated, pressurized by the suction means 16 flows out of the heating pre-chamber 14 into the heating chamber 15 in which it acquires a turbulent and vortical motion by flowing over the exchanger body 12 and its fins 20, absorbing therefrom heat yielded thereto by the gases combusting in the combustion chamber 13 and by the exhaust gases which, from there, flow out through the heat recovery chamber 24 and the heat-sink portion 34a.
  • FIG. 1 shows, for the purposes of non-limiting example
  • the invention fully achieves the intended aim and objects by providing an air-circulation space heating device that makes it possible to achieve thermal exchange efficiencies that are higher than conventional fan coil units, while also making it possible to make the combustion chamber wider.
  • a heating device makes it possible to prevent the formation of nitrogen oxides, by making it possible to keep the combustion temperature lower, for the same thermal power yielded to the air to be heated, than conventional devices.
  • a heating device exhibits a lower environmental impact than conventional fan coil units, by enabling a more complete combustion of the fuel, greater thermal efficiency and lower pollutant emissions.
  • a heating device is quieter in operation than conventional fan coil units, by way of the ability to use fans with vanes curved forward exhibiting better aerodynamic efficiency.
  • a heating device is longer lasting than conventional fan coil units, by enabling effective protection from superheating of both the control device and the sensitive components of the burner assembly which are cooled by the air to be heated, to the advantage of their durability and of the heat recovery efficiency of the heating device.
  • a heating device according to the invention is also structurally simple and easy to use, and can be made at low cost.

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)
  • Air Supply (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
EP20110174684 2010-07-23 2011-07-20 Space heater of the ventilation type Withdrawn EP2410258A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPD2010A000235A IT1401181B1 (it) 2010-07-23 2010-07-23 Dispositivo di riscaldamento ambientale del tipo a ventilazione

Publications (1)

Publication Number Publication Date
EP2410258A1 true EP2410258A1 (en) 2012-01-25

Family

ID=43531054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110174684 Withdrawn EP2410258A1 (en) 2010-07-23 2011-07-20 Space heater of the ventilation type

Country Status (3)

Country Link
EP (1) EP2410258A1 (it)
CN (1) CN102345899A (it)
IT (1) IT1401181B1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10101057B2 (en) 2014-11-20 2018-10-16 Dantherm S.p.A Heating unit for a fuel air heater, method for manufacturing said heating unit, and fuel air heater comprising said heating unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103960165B (zh) * 2014-05-13 2015-12-30 王健 燃气加热系统及其使用方法、孵化机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB735152A (en) * 1953-07-09 1955-08-17 Dragonair Ltd Improved apparatus for producing and delivering heated air
FR1312844A (fr) * 1962-01-27 1962-12-21 Appareil de chauffage notamment pour véhicules à moteur et autres usages
GB1366922A (en) * 1971-11-04 1974-09-18 Stukley P A R Air heater
US4275705A (en) * 1979-03-15 1981-06-30 Canadian Gas Research Institute Two-stage heat exchanger
US6318358B1 (en) * 2000-08-03 2001-11-20 Jackel Incorporated Furnace blower with double sided impeller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB735152A (en) * 1953-07-09 1955-08-17 Dragonair Ltd Improved apparatus for producing and delivering heated air
FR1312844A (fr) * 1962-01-27 1962-12-21 Appareil de chauffage notamment pour véhicules à moteur et autres usages
GB1366922A (en) * 1971-11-04 1974-09-18 Stukley P A R Air heater
US4275705A (en) * 1979-03-15 1981-06-30 Canadian Gas Research Institute Two-stage heat exchanger
US6318358B1 (en) * 2000-08-03 2001-11-20 Jackel Incorporated Furnace blower with double sided impeller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10101057B2 (en) 2014-11-20 2018-10-16 Dantherm S.p.A Heating unit for a fuel air heater, method for manufacturing said heating unit, and fuel air heater comprising said heating unit

Also Published As

Publication number Publication date
CN102345899A (zh) 2012-02-08
ITPD20100235A1 (it) 2012-01-24
IT1401181B1 (it) 2013-07-12

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