US20120192849A1 - Furnace with primary and secondary heat exchangers - Google Patents
Furnace with primary and secondary heat exchangers Download PDFInfo
- Publication number
- US20120192849A1 US20120192849A1 US13/362,831 US201213362831A US2012192849A1 US 20120192849 A1 US20120192849 A1 US 20120192849A1 US 201213362831 A US201213362831 A US 201213362831A US 2012192849 A1 US2012192849 A1 US 2012192849A1
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- United States
- Prior art keywords
- heat exchanger
- air
- flow
- furnace
- heated fluid
- 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.)
- Abandoned
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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
- 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
- F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
-
- 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
- F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
- F24H8/006—Means for removing condensate from the heater
-
- 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
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Definitions
- the present invention relates to a furnace that is utilized to heat a flow of air.
- Furnaces can be used to heat a flow of air partially drawn from outside air and partially drawing from the space conditioned or heated by the furnace.
- the flow of air is passed through a heat exchanger to heat the flow of air.
- the heat exchanger can receive heated combustion air from a burner to heat the flow of air. After passing through the heat exchanger the heated flow of air is discharged to a conditioned space while the combustion air can be discharged to the atmosphere.
- the invention provides a furnace configured to heat a flow of air and discharge the heated flow of air into a conditioned space.
- the furnace includes an air duct including an air inlet and an air outlet, and the air duct defines an air flow path from the air inlet to the air outlet.
- the air duct is configured to direct the flow of air along the air flow path from the air inlet to the air outlet.
- the furnace further includes a heater configured to heat a fluid and discharge a heated fluid flow, a first heat exchanger at least partially positioned in the air duct and in fluid communication with the heater to receive the heated fluid flow, and a second heat exchanger at least partially positioned in the air duct and in fluid communication with the first heat exchanger so that the heated fluid flow flows through the second heat exchanger after flowing through the first heat exchanger.
- the first heat exchanger and the second heat exchanger are arranged in the air duct so that the flow of air travels through the first heat exchanger to transfer heat between the heated fluid flow and the flow of air, and then through the second heat exchanger after the first heat exchanger to transfer heat between the heated fluid flow and the flow of air.
- the invention provides a method of operating a furnace including heating a fluid with a heater, directing the heated fluid through a first heat exchanger, directing a flow of air through the first heat exchanger, transferring heat from the heated fluid to the flow of air in the first heat exchanger, directing the heated fluid through a second heat exchanger after directing the heated fluid through the first heat exchanger, directing the flow of air through the second heat exchanger after directing the flow of air through the first heat exchanger, transferring heat from the heated fluid to the flow of air in the second heat exchanger.
- FIG. 1 is a perspective view of a furnace according to an embodiment of the invention with a portion of the furnace removed to show an interior of the furnace.
- FIG. 2 is first perspective view of a portion of the furnace of FIG. 1 .
- FIG. 3 is a second perspective view of the portion of the furnace of FIG. 2 .
- FIG. 4 is a side view of the portion of the furnace of FIGS. 2 and 3 .
- phraseology and terminology used herein with reference to device or element orientation are only used to simplify description of the present invention, and do not alone indicate or imply that the device or element referred to must have a particular orientation.
- terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance.
- FIG. 1 illustrates a furnace 10 .
- the furnace 10 is mounted to a roof of a building or other structure to provide heated air to a conditioned space or room within the building.
- the furnace 10 can be mounted to other suitable locations on the building, such as an exterior wall or the like.
- the furnace 10 can be mounted to a frame and ducts can be used to fluidly couple the furnace 10 to the conditioned space or room within the building.
- the illustrated furnace 10 includes an air duct 14 , an air handling unit 16 , a heater 18 , a first heat exchanger 20 , and a second heat exchanger 22 .
- the air duct 14 includes an air inlet 26 and an air outlet 28 .
- the illustrated air duct 14 is formed by sheet metal panels 30 that can be cut, bent, and then fastened together to form the air duct 14 . It should be noted that sheet metal panels 30 have been removed from a rear side 32 of the furnace 10 in the illustration in FIG. 1 to show the heat exchanger 20 and inside the air duct 14 in the illustration of FIG. 1 .
- the air duct 14 forms an air flow path to direct a flow of air from the inlet 26 and through the first heat exchanger 20 and the second heat exchanger 22 and then through the outlet 28 .
- the air inlet 26 is positioned outside the building or structure so that all (i.e., 100 percent) of the air that flows through the air duct 14 is outside or ambient fresh air. In other embodiments, a majority (i.e., greater than 50 percent) of the air that flows through the air duct 14 is outside air and the remainder of the air that flows through the air duct can be air that is circulated from the conditioned space (i.e., inside air).
- the outlet 28 is positioned so that the air duct 14 discharges the flow of air into the conditioned space or building. Additional ducts or the like can be attached to the outlet 28 to facilitate transporting the flow of air into the conditioned space or building.
- the illustrated air handling unit 16 includes a centrifugal fan 34 and an electric motor 36 .
- the motor 36 is coupled to the fan 34 using a drive system so that operation of the motor 36 rotates the fan 34 to draw the flow of air into the duct 14 through the inlet 26 .
- the illustrated heater 18 includes a plurality of burners 40 , a fuel supply header 42 , a fuel supply line 44 , a first valve 46 , and a second valve 48 .
- each of the burners 40 is an inshot burner. In other embodiments, other types of burners can be used, such as ribbon burners, strip burners, power burners, etc.
- the burners 40 are in fluid communication with the fuel supply header 42 and the header 42 is in fluid communication with the fuel supply line 44 .
- the first valve 46 is operable to open and close the fuel supply line 44 to allow fuel, such as natural gas or propane, to flow through the line 44 or stop the flow of fuel through the line 44 to the burner 40 .
- the second valve 48 is downstream from the first valve 46 along the line 44 , and the second valve 48 is a modulating valve that allows the amount of fuel flow through the line 44 and to the burners 40 to be adjusted to a desired amount.
- the illustrated first heat exchanger 20 is a tubular heat exchanger including a plurality of tubes 52 each having a tube inlet 54 aligned with one of the burners 40 , and the tube inlet 54 receives heated fluid from the adjacent burner 40 that is a by-product of the combustion of the fuel at the burner 40 .
- the illustrated tubes 52 are serpentine and define a general “S” configuration.
- Each of the tubes 52 also has a tube outlet 56 that discharges the heated fluid (i.e., heated gas in the illustrated embodiment) from the first heat exchanger 20 .
- other suitable types of heat exchangers can be used, including, fin tube, plate, clam shell, and drum type heat exchangers.
- the illustrated second heat exchanger 22 is a fin tube heat exchanger including tubes 58 and fins 60 located between the tubes 58 .
- the tubes 58 each include an inlet end 64 ( FIG. 2 ) and an outlet end 66 ( FIG. 3 ).
- the inlet end 64 includes an aperture that receives the discharged heated gas from the tube outlets 56 of the first heat exchanger 20 .
- a turn-around header 68 is coupled to the tube outlets 56 and the inlet ends 64 to direct the discharged heated gas from the first heat exchanger 20 to the second heat exchanger 22 .
- the second heat exchanger can be other suitable types of heat exchangers, including, tubular, plate, clam shell and drum type heat exchangers.
- a discharge header 70 is coupled to the outlet ends 66 of the tubes 58 of the second heat exchanger 22 to receive and collect the heated gas from the second heat exchanger 22 after it flows through the second heat exchanger 22 .
- a condensate outlet 72 is in fluid communication with the discharge header 70 to collect and discharge any condensate that may form in the heat exchangers 20 and 22 and the headers 68 and 70 .
- Condensate traps 76 ( FIG. 1 ) are fluidly coupled to the condensate outlet 72 to control the discharge of condensate from the furnace 10 .
- a combustion air handling unit 80 is in fluid communication with the discharge header 70 .
- the air handling unit 80 includes a centrifugal fan 82 and an electric motor 84 that is operable to drive the fan 82 .
- the fan 82 includes an inlet that is in fluid communication with the discharge header 70 and an outlet 88 that is in fluid communication with exhaust outlets 92 ( FIG. 1 ).
- the motor 84 drives the fan 82 to draw combustion air through the inlets 54 of the tubes 52 and draw the heated gas through the tubes 54 and 58 of the heat exchangers 20 and 22 and discharge the heated gas through the exhaust outlet 92 of the furnace 10 .
- the air handling unit 16 draws a flow of air through the air inlet 26 .
- the air duct 14 directs the flow of air through the first heat exchanger 20 and then through the second heat exchanger 22 generally in the direction of arrows 96 in FIG. 4 .
- the fuel supply line 44 supplies fuel to the burners 40 where the fuel is ignited and burned and the burners 40 discharge the heated gas into the tubes 52 of the first heat exchanger 20 .
- the heated gas travels through the tubes 52 and 58 generally in the direction represented by the arrows 98 in FIG. 4 . Heat is transferred from the heated gas to the flow of air in the first heat exchanger 20 as the flow of air travels over and around the tubes 52 .
- the flow of air which has been heated in the first heat exchanger, a primary heat exchanger in the illustrated embodiment, then flows through the second heat exchanger 22 .
- the flow of air 22 travels between the tubes 58 and through the fins 60 of the second heat exchanger 22 .
- the heated combustion air flows from the first heat exchanger 20 into the turn-around header 68 and into the tubes 58 of the second heat exchanger 22 .
- additional heat is transferred from the heated gas to the flow of air to further heat the flow of air.
- the flow of air is discharged through the outlet 28 of the duct 14 and supplied to the conditioned space or building, and the heated gas travels through the fan 82 and is discharged to the atmosphere via the exhaust outlets 92 .
- condensation may be formed.
- the heated gas is cooled by the flow of air in the second heat exchanger 22 from a first temperature above a dew point temperature of the heated gas to a second temperature below the dew point temperature of the gas, which causes condensation to form in the second heat exchanger 22 .
- the condensate travels by gravity through the condensate outlet 72 and then through the traps 76 where it is discharged from the furnace 10 .
- the flow of air is first heated by the primary heat exchanger 20 which is directly downstream from the burners 40 and then the flow of air is heated by the secondary heat exchanger 22 , which is downstream from the primary heat exchanger 20 .
- Such an arrangement inhibits condensate from forming and then freezing in the primary heat exchanger 20 due to the relatively high temperatures adjacent the burners 40 .
- the flow of air drawn through the air inlet 26 is at or below 0 Celsius or the freezing temperature of water this arrangement may be particularly beneficial.
- Any condensate that forms in the secondary heat exchanger 22 is inhibited from freezing because the flow of air has already been heated to a temperature above the freezing temperature of water by the first heat exchanger 20 .
- Such an arrangement is particularly useful in applications where a majority of the air drawn through the air inlet 26 is ambient or outdoor air, which may be at temperatures below the freezing temperature of water.
Abstract
Description
- The present invention relates to a furnace that is utilized to heat a flow of air.
- Furnaces can be used to heat a flow of air partially drawn from outside air and partially drawing from the space conditioned or heated by the furnace. The flow of air is passed through a heat exchanger to heat the flow of air. The heat exchanger can receive heated combustion air from a burner to heat the flow of air. After passing through the heat exchanger the heated flow of air is discharged to a conditioned space while the combustion air can be discharged to the atmosphere.
- In one embodiment, the invention provides a furnace configured to heat a flow of air and discharge the heated flow of air into a conditioned space. The furnace includes an air duct including an air inlet and an air outlet, and the air duct defines an air flow path from the air inlet to the air outlet. The air duct is configured to direct the flow of air along the air flow path from the air inlet to the air outlet. The furnace further includes a heater configured to heat a fluid and discharge a heated fluid flow, a first heat exchanger at least partially positioned in the air duct and in fluid communication with the heater to receive the heated fluid flow, and a second heat exchanger at least partially positioned in the air duct and in fluid communication with the first heat exchanger so that the heated fluid flow flows through the second heat exchanger after flowing through the first heat exchanger. The first heat exchanger and the second heat exchanger are arranged in the air duct so that the flow of air travels through the first heat exchanger to transfer heat between the heated fluid flow and the flow of air, and then through the second heat exchanger after the first heat exchanger to transfer heat between the heated fluid flow and the flow of air.
- In another embodiment the invention provides a method of operating a furnace including heating a fluid with a heater, directing the heated fluid through a first heat exchanger, directing a flow of air through the first heat exchanger, transferring heat from the heated fluid to the flow of air in the first heat exchanger, directing the heated fluid through a second heat exchanger after directing the heated fluid through the first heat exchanger, directing the flow of air through the second heat exchanger after directing the flow of air through the first heat exchanger, transferring heat from the heated fluid to the flow of air in the second heat exchanger.
- Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings.
-
FIG. 1 is a perspective view of a furnace according to an embodiment of the invention with a portion of the furnace removed to show an interior of the furnace. -
FIG. 2 is first perspective view of a portion of the furnace ofFIG. 1 . -
FIG. 3 is a second perspective view of the portion of the furnace ofFIG. 2 . -
FIG. 4 is a side view of the portion of the furnace ofFIGS. 2 and 3 . - Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
- Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings.
- Also, it is to be understood that phraseology and terminology used herein with reference to device or element orientation (such as, for example, terms like “central,” “upper,” “lower,” “front,” “rear,” and the like) are only used to simplify description of the present invention, and do not alone indicate or imply that the device or element referred to must have a particular orientation. In addition, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance.
-
FIG. 1 illustrates afurnace 10. In one embodiment, thefurnace 10 is mounted to a roof of a building or other structure to provide heated air to a conditioned space or room within the building. In other embodiments, thefurnace 10 can be mounted to other suitable locations on the building, such as an exterior wall or the like. In yet other embodiment, thefurnace 10 can be mounted to a frame and ducts can be used to fluidly couple thefurnace 10 to the conditioned space or room within the building. - Referring to
FIGS. 1 and 2 , the illustratedfurnace 10 includes anair duct 14, anair handling unit 16, aheater 18, afirst heat exchanger 20, and asecond heat exchanger 22. Theair duct 14 includes anair inlet 26 and anair outlet 28. The illustratedair duct 14 is formed bysheet metal panels 30 that can be cut, bent, and then fastened together to form theair duct 14. It should be noted thatsheet metal panels 30 have been removed from arear side 32 of thefurnace 10 in the illustration inFIG. 1 to show theheat exchanger 20 and inside theair duct 14 in the illustration ofFIG. 1 . - The
air duct 14 forms an air flow path to direct a flow of air from theinlet 26 and through thefirst heat exchanger 20 and thesecond heat exchanger 22 and then through theoutlet 28. In the illustrated embodiment, theair inlet 26 is positioned outside the building or structure so that all (i.e., 100 percent) of the air that flows through theair duct 14 is outside or ambient fresh air. In other embodiments, a majority (i.e., greater than 50 percent) of the air that flows through theair duct 14 is outside air and the remainder of the air that flows through the air duct can be air that is circulated from the conditioned space (i.e., inside air). Theoutlet 28 is positioned so that theair duct 14 discharges the flow of air into the conditioned space or building. Additional ducts or the like can be attached to theoutlet 28 to facilitate transporting the flow of air into the conditioned space or building. - With continued reference to
FIG. 1 , the illustratedair handling unit 16 includes acentrifugal fan 34 and anelectric motor 36. Themotor 36 is coupled to thefan 34 using a drive system so that operation of themotor 36 rotates thefan 34 to draw the flow of air into theduct 14 through theinlet 26. - Referring to
FIG. 2 , the illustratedheater 18 includes a plurality ofburners 40, afuel supply header 42, afuel supply line 44, afirst valve 46, and asecond valve 48. In the illustrated embodiment, each of theburners 40 is an inshot burner. In other embodiments, other types of burners can be used, such as ribbon burners, strip burners, power burners, etc. Theburners 40 are in fluid communication with thefuel supply header 42 and theheader 42 is in fluid communication with thefuel supply line 44. Thefirst valve 46 is operable to open and close thefuel supply line 44 to allow fuel, such as natural gas or propane, to flow through theline 44 or stop the flow of fuel through theline 44 to theburner 40. Thesecond valve 48 is downstream from thefirst valve 46 along theline 44, and thesecond valve 48 is a modulating valve that allows the amount of fuel flow through theline 44 and to theburners 40 to be adjusted to a desired amount. - Referring to
FIGS. 2 and 3 , the illustratedfirst heat exchanger 20 is a tubular heat exchanger including a plurality oftubes 52 each having atube inlet 54 aligned with one of theburners 40, and thetube inlet 54 receives heated fluid from theadjacent burner 40 that is a by-product of the combustion of the fuel at theburner 40. The illustratedtubes 52 are serpentine and define a general “S” configuration. Each of thetubes 52 also has atube outlet 56 that discharges the heated fluid (i.e., heated gas in the illustrated embodiment) from thefirst heat exchanger 20. In other embodiments, other suitable types of heat exchangers can be used, including, fin tube, plate, clam shell, and drum type heat exchangers. - The illustrated
second heat exchanger 22 is a fin tube heatexchanger including tubes 58 andfins 60 located between thetubes 58. Thetubes 58 each include an inlet end 64 (FIG. 2 ) and an outlet end 66 (FIG. 3 ). Theinlet end 64 includes an aperture that receives the discharged heated gas from thetube outlets 56 of thefirst heat exchanger 20. In the illustrated embodiment, a turn-around header 68 is coupled to thetube outlets 56 and the inlet ends 64 to direct the discharged heated gas from thefirst heat exchanger 20 to thesecond heat exchanger 22. In other embodiments, the second heat exchanger can be other suitable types of heat exchangers, including, tubular, plate, clam shell and drum type heat exchangers. - Referring to
FIG. 2 , adischarge header 70 is coupled to theoutlet ends 66 of thetubes 58 of thesecond heat exchanger 22 to receive and collect the heated gas from thesecond heat exchanger 22 after it flows through thesecond heat exchanger 22. Acondensate outlet 72 is in fluid communication with thedischarge header 70 to collect and discharge any condensate that may form in theheat exchangers headers FIG. 1 ) are fluidly coupled to thecondensate outlet 72 to control the discharge of condensate from thefurnace 10. - With reference to
FIGS. 2 and 4 , a combustionair handling unit 80 is in fluid communication with thedischarge header 70. Theair handling unit 80 includes acentrifugal fan 82 and anelectric motor 84 that is operable to drive thefan 82. Thefan 82 includes an inlet that is in fluid communication with thedischarge header 70 and anoutlet 88 that is in fluid communication with exhaust outlets 92 (FIG. 1 ). Themotor 84 drives thefan 82 to draw combustion air through theinlets 54 of thetubes 52 and draw the heated gas through thetubes heat exchangers furnace 10. - In operation, the
air handling unit 16 draws a flow of air through theair inlet 26. Theair duct 14 directs the flow of air through thefirst heat exchanger 20 and then through thesecond heat exchanger 22 generally in the direction ofarrows 96 inFIG. 4 . Meanwhile, thefuel supply line 44 supplies fuel to theburners 40 where the fuel is ignited and burned and theburners 40 discharge the heated gas into thetubes 52 of thefirst heat exchanger 20. The heated gas travels through thetubes arrows 98 inFIG. 4 . Heat is transferred from the heated gas to the flow of air in thefirst heat exchanger 20 as the flow of air travels over and around thetubes 52. The flow of air, which has been heated in the first heat exchanger, a primary heat exchanger in the illustrated embodiment, then flows through thesecond heat exchanger 22. The flow ofair 22 travels between thetubes 58 and through thefins 60 of thesecond heat exchanger 22. Meanwhile, the heated combustion air flows from thefirst heat exchanger 20 into the turn-aroundheader 68 and into thetubes 58 of thesecond heat exchanger 22. In thesecond heat exchanger 22, additional heat is transferred from the heated gas to the flow of air to further heat the flow of air. After flowing through thesecond heat exchanger 22, the flow of air is discharged through theoutlet 28 of theduct 14 and supplied to the conditioned space or building, and the heated gas travels through thefan 82 and is discharged to the atmosphere via the exhaust outlets 92. - As the heated gas is cooled by the flow of air in the
first heat exchanger 20 and thesecond heat exchanger 22, condensation may be formed. For example, in one embodiment, the heated gas is cooled by the flow of air in thesecond heat exchanger 22 from a first temperature above a dew point temperature of the heated gas to a second temperature below the dew point temperature of the gas, which causes condensation to form in thesecond heat exchanger 22. The condensate travels by gravity through thecondensate outlet 72 and then through thetraps 76 where it is discharged from thefurnace 10. In the illustrated embodiment, the flow of air is first heated by theprimary heat exchanger 20 which is directly downstream from theburners 40 and then the flow of air is heated by thesecondary heat exchanger 22, which is downstream from theprimary heat exchanger 20. Such an arrangement inhibits condensate from forming and then freezing in theprimary heat exchanger 20 due to the relatively high temperatures adjacent theburners 40. When the flow of air drawn through theair inlet 26 is at or below 0 Celsius or the freezing temperature of water this arrangement may be particularly beneficial. Any condensate that forms in thesecondary heat exchanger 22 is inhibited from freezing because the flow of air has already been heated to a temperature above the freezing temperature of water by thefirst heat exchanger 20. Such an arrangement is particularly useful in applications where a majority of the air drawn through theair inlet 26 is ambient or outdoor air, which may be at temperatures below the freezing temperature of water. - Various features and advantages of the invention are set forth in the following claims.
Claims (23)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/362,831 US20120192849A1 (en) | 2012-01-31 | 2012-01-31 | Furnace with primary and secondary heat exchangers |
CA2792347A CA2792347A1 (en) | 2012-01-31 | 2012-10-12 | Furnace with primary and secondary heat exchangers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US13/362,831 US20120192849A1 (en) | 2012-01-31 | 2012-01-31 | Furnace with primary and secondary heat exchangers |
Publications (1)
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US20120192849A1 true US20120192849A1 (en) | 2012-08-02 |
Family
ID=46576300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/362,831 Abandoned US20120192849A1 (en) | 2012-01-31 | 2012-01-31 | Furnace with primary and secondary heat exchangers |
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US (1) | US20120192849A1 (en) |
CA (1) | CA2792347A1 (en) |
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CN104913500A (en) * | 2015-06-17 | 2015-09-16 | 史云飞 | Automatic energy-saving environmental protection hot blast stove and operation method thereof |
CN104930701A (en) * | 2015-06-18 | 2015-09-23 | 河南中农福安农业装备有限公司 | Clean hot-blast stove |
US20160216005A1 (en) * | 2015-01-23 | 2016-07-28 | Heatco, Inc. | Four pass high efficiency furnace and heat exchanger |
US20160216004A1 (en) * | 2015-01-23 | 2016-07-28 | Heatco, Inc. | High efficiency, high turndown furnace system |
US10502454B2 (en) | 2016-08-01 | 2019-12-10 | Johnson Controls Technology Company | Furnace for a rooftop unit |
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2012
- 2012-01-31 US US13/362,831 patent/US20120192849A1/en not_active Abandoned
- 2012-10-12 CA CA2792347A patent/CA2792347A1/en not_active Abandoned
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CN104930701A (en) * | 2015-06-18 | 2015-09-23 | 河南中农福安农业装备有限公司 | Clean hot-blast stove |
US10502454B2 (en) | 2016-08-01 | 2019-12-10 | Johnson Controls Technology Company | Furnace for a rooftop unit |
US11486604B2 (en) | 2016-08-01 | 2022-11-01 | Johnson Controls Tyco IP Holdings LLP | Furnace for a rooftop unit |
US20210325038A1 (en) * | 2020-04-17 | 2021-10-21 | Ut-Battelle, Llc | Monolithic gas trap adsorber for high efficiency, cost effective, low-emission condensing furnace |
US11802692B2 (en) * | 2020-04-17 | 2023-10-31 | Ut-Battelle, Llc | Monolithic gas trap adsorber for high efficiency, cost effective, low-emission condensing furnace |
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