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WO2015140158A1 - Condensing hot air generator - Google Patents

Condensing hot air generator Download PDF

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Publication number
WO2015140158A1
WO2015140158A1 PCT/EP2015/055537 EP2015055537W WO2015140158A1 WO 2015140158 A1 WO2015140158 A1 WO 2015140158A1 EP 2015055537 W EP2015055537 W EP 2015055537W WO 2015140158 A1 WO2015140158 A1 WO 2015140158A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
secondary heat
air
hot air
flow
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.)
Ceased
Application number
PCT/EP2015/055537
Other languages
French (fr)
Inventor
Alfonso Vescovi
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.)
TECNOCLIMA SpA
Original Assignee
TECNOCLIMA SpA
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 TECNOCLIMA SpA filed Critical TECNOCLIMA SpA
Publication of WO2015140158A1 publication Critical patent/WO2015140158A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
    • 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
    • F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
    • F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes 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
    • F24H9/0052—Details for air heaters
    • F24H9/0057—Guiding means
    • F24H9/0063—Guiding means in air channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/21—Burners specially adapted for a particular use
    • F23D2900/21003—Burners specially adapted for a particular use for heating or re-burning air or gas in a duct
    • 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
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/06—Air heaters

Definitions

  • the present invention relates generally to the technical field of heating apparatus and, more particularly, to a condensing hot air generator fired by a liquid or gaseous fuel.
  • a heating apparatus of the aforesaid type generally includes a primary heat exchanger and a secondary heat exchanger (or condenser) which are connected to each other in series, with respect to the direction of flow of the combustion gases.
  • the air to be heated which is pushed by a suitable fan, initially flows over the secondary heat exchanger, and then over the primary heat exchanger.
  • the primary heat exchanger transfers sensible heat from the hot combustion gases to the air, while the secondary heat exchanger transfers mainly latent heat, so that the combustion gases are cooled considerably before being discharged into the atmosphere.
  • the heat transfer from the hot combustion gases to the air is maximised, and so the efficiency of the heating apparatus is increased.
  • a condensing hot air generator of the aforesaid type is described, for example, in US patent No. 4,848,314.
  • a drawback of this, and other hot air generators having a similar construction, is the impossibility to separately adjust the rate of flow of the air which passes over the secondary heat exchanger, because this is placed in series with the primary heat exchanger with respect to the flow direction of the air to be heated.
  • the heating power and the rate of air flow of the hot air generator cannot be optimised, and in some operating conditions it has occurred that it is difficult to heat the air to the desired temperature.
  • the present invention has the object of obviating the above mentioned drawback. More particularly, according to the present invention, this object is achieved with a hot air generator comprising a primary heat exchanger and a secondary heat exchanger or condenser, characterised in that the primary heat exchanger and the secondary heat exchanger are placed in parallel to each other with respect to the direction of flow of the air to be heated, and in that a damper is arranged at the inlet of a duct leading the flow of air to be heated to the secondary heat exchanger, in order to control the rate of air flow towards said secondary heat exchanger.
  • the hot air generator comprises a centrifugal fan 11 with an associated drive motor 12, a combustion chamber 13, a primary heat exchanger 14 and a secondary heat exchanger or condenser 15.
  • the secondary heat exchanger 15 As the environment in the secondary heat exchanger 15 is highly corrosive, due to the presence of acids produced with the condensation of the flue gas, the secondary heat exchanger 15 is designed and constructed with suitable materials, such as stainless steel, in order to resist corrosion.
  • the primary heat exchanger 14 and the secondary heat exchanger 15 are placed in parallel with respect to the direction of flow of the air generated by the fan 11.
  • the air to be heated is pushed by the centrifugal fan 11 from the bottom up along two separate vertical ducts 16 and 17, which guide the air towards the primary heat exchanger 14 and the secondary heat exchanger 15, respectively.
  • a damper 18 which allows the rate of air flow to the secondary heat exchanger 15 to be adjusted.
  • the hot air generator according to the invention allows the rate of air flow over the secondary heat exchanger to be adjusted separately. In this manner, a better control of the heating power and of the rate of air flow of the hot air generator can be achieved, thus allowing the desired air temperature to be obtained in any operating condition.

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  • 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)
  • Sorption Type Refrigeration Machines (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The hot air generator (10) comprises a primary heat exchanger (14) and a secondary heat exchanger or condenser (15). The primary heat exchanger (14) and the secondary heat exchanger (15) are placed in parallel to each other with respect to the direction of flow of the air to be heated. A damper (18) is arranged at the inlet of a duct leading the flow of air to be heated to the secondary heat exchanger (15), in order to control the rate of air flow towards said secondary heat exchanger (15).

Description

Condensing hot air generator Technical Field
The present invention relates generally to the technical field of heating apparatus and, more particularly, to a condensing hot air generator fired by a liquid or gaseous fuel.
Background Art
A heating apparatus of the aforesaid type generally includes a primary heat exchanger and a secondary heat exchanger (or condenser) which are connected to each other in series, with respect to the direction of flow of the combustion gases.
During the operation of the heating apparatus, the air to be heated, which is pushed by a suitable fan, initially flows over the secondary heat exchanger, and then over the primary heat exchanger. The primary heat exchanger transfers sensible heat from the hot combustion gases to the air, while the secondary heat exchanger transfers mainly latent heat, so that the combustion gases are cooled considerably before being discharged into the atmosphere. Thus, the heat transfer from the hot combustion gases to the air is maximised, and so the efficiency of the heating apparatus is increased.
A condensing hot air generator of the aforesaid type is described, for example, in US patent No. 4,848,314. A drawback of this, and other hot air generators having a similar construction, is the impossibility to separately adjust the rate of flow of the air which passes over the secondary heat exchanger, because this is placed in series with the primary heat exchanger with respect to the flow direction of the air to be heated.
Therefore, the heating power and the rate of air flow of the hot air generator cannot be optimised, and in some operating conditions it has occurred that it is difficult to heat the air to the desired temperature.
Disclosure of Invention
The present invention has the object of obviating the above mentioned drawback. More particularly, according to the present invention, this object is achieved with a hot air generator comprising a primary heat exchanger and a secondary heat exchanger or condenser, characterised in that the primary heat exchanger and the secondary heat exchanger are placed in parallel to each other with respect to the direction of flow of the air to be heated, and in that a damper is arranged at the inlet of a duct leading the flow of air to be heated to the secondary heat exchanger, in order to control the rate of air flow towards said secondary heat exchanger.
Brief Description of Drawing
The features and advantages of the invention will become more apparent from the following detailed description of an embodiment thereof, given by way of example and illustrated in the attached drawing, whose sole figure is a side elevational view of a hot air generator according to the invention.
Best Mode for Carrying Out the Invention
With reference to the sole figure of the drawing, there is designated generally by reference numeral 10 a hot air generator according to the invention. The hot air generator comprises a centrifugal fan 11 with an associated drive motor 12, a combustion chamber 13, a primary heat exchanger 14 and a secondary heat exchanger or condenser 15.
As the environment in the secondary heat exchanger 15 is highly corrosive, due to the presence of acids produced with the condensation of the flue gas, the secondary heat exchanger 15 is designed and constructed with suitable materials, such as stainless steel, in order to resist corrosion.
It can be noticed that the primary heat exchanger 14 and the secondary heat exchanger 15 are placed in parallel with respect to the direction of flow of the air generated by the fan 11. The air to be heated is pushed by the centrifugal fan 11 from the bottom up along two separate vertical ducts 16 and 17, which guide the air towards the primary heat exchanger 14 and the secondary heat exchanger 15, respectively. At the entrance of the duct 17 which leads the flow of air towards the secondary heat exchanger 15 there is arranged a damper 18 which allows the rate of air flow to the secondary heat exchanger 15 to be adjusted.
Unlike traditional hot air generators, the hot air generator according to the invention allows the rate of air flow over the secondary heat exchanger to be adjusted separately. In this manner, a better control of the heating power and of the rate of air flow of the hot air generator can be achieved, thus allowing the desired air temperature to be obtained in any operating condition.

Claims (2)

  1. Hot air generator (10) comprising a primary heat exchanger (14) and a secondary heat exchanger or condenser (15), characterised in that the primary heat exchanger (14) and the secondary heat exchanger (15) are placed in parallel to each other with respect to the direction of flow of the air to be heated, and in that a damper (18) is arranged at the inlet of a duct leading the flow of air to be heated to the secondary heat exchanger (15), in order to control the rate of air flow towards said secondary heat exchanger (15).
  2. Hot air generator according to claim 1, characterised in that the secondary heat exchanger (15) is made of a corrosion resistant material.
PCT/EP2015/055537 2014-03-19 2015-03-17 Condensing hot air generator Ceased WO2015140158A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2014U000108U ITMI20140108U1 (en) 2014-03-19 2014-03-19 CONDENSING HOT AIR GENERATOR
ITMI2014U000108 2014-03-19

Publications (1)

Publication Number Publication Date
WO2015140158A1 true WO2015140158A1 (en) 2015-09-24

Family

ID=52811097

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/055537 Ceased WO2015140158A1 (en) 2014-03-19 2015-03-17 Condensing hot air generator

Country Status (2)

Country Link
IT (1) ITMI20140108U1 (en)
WO (1) WO2015140158A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848314A (en) 1985-09-20 1989-07-18 Carrier Corporation Condensing furnace
WO2009095944A2 (en) * 2008-01-30 2009-08-06 Tecnoclima S.P.A. Improved hot air unit heater
US20100025487A1 (en) * 2008-07-08 2010-02-04 Rinnai Corporation Forced draft direct vent type room heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4848314A (en) 1985-09-20 1989-07-18 Carrier Corporation Condensing furnace
WO2009095944A2 (en) * 2008-01-30 2009-08-06 Tecnoclima S.P.A. Improved hot air unit heater
US20100025487A1 (en) * 2008-07-08 2010-02-04 Rinnai Corporation Forced draft direct vent type room heater

Also Published As

Publication number Publication date
ITMI20140108U1 (en) 2015-09-19

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