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WO2008002940A2 - Chauffe-eau à bras latéral de condensation - Google Patents

Chauffe-eau à bras latéral de condensation Download PDF

Info

Publication number
WO2008002940A2
WO2008002940A2 PCT/US2007/072160 US2007072160W WO2008002940A2 WO 2008002940 A2 WO2008002940 A2 WO 2008002940A2 US 2007072160 W US2007072160 W US 2007072160W WO 2008002940 A2 WO2008002940 A2 WO 2008002940A2
Authority
WO
WIPO (PCT)
Prior art keywords
water heater
feed gas
condensing side
burner
tank
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/US2007/072160
Other languages
English (en)
Other versions
WO2008002940A3 (fr
Inventor
James D. Lutz
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.)
University of California Berkeley
University of California San Diego UCSD
Original Assignee
University of California Berkeley
University of California San Diego UCSD
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 University of California Berkeley, University of California San Diego UCSD filed Critical University of California Berkeley
Priority to US12/306,190 priority Critical patent/US20090188447A1/en
Publication of WO2008002940A2 publication Critical patent/WO2008002940A2/fr
Anticipated expiration legal-status Critical
Publication of WO2008002940A3 publication Critical patent/WO2008002940A3/fr
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/003—Feed-water heater systems
    • 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
    • F24H1/18—Water-storage heaters
    • F24H1/186—Water-storage heaters 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
    • 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 generally to water heating, and more specifically to high efficiency water heating, and most specifically to condensing side- arm water heaters.
  • this invention provides for a condensing side-arm water heater, comprising: a) a tank; b) a recirculation pipe fluidly connected to an recirculation pipe; d) a burner for heating the water, that produces heated combustion products; e) an exhaust system that takes the heated combustion products from the burner, and transfers a fraction of the heat to the heat exchanger; i) the exhaust system comprising: (1) an exhaust fan blower; (2) a drip pipe; (3)and an air inlet; f) whereby the heated combustion products pass through the exhaust system, condensing water vapor from the combustion byproducts, and expelling the condensed water vapor through the drip pipe.
  • the burner may bum anything that produces heat when oxidized in air, examples would include, oil, gas, LP gas, propane, etc.
  • FIG. 1 is a traditional electric water heater schematic.
  • FIG. 2 is a condensing side-arm gas-fired water heater.
  • Side-arm means external to a main reservoir tank, physically appears as an arm on the side.
  • This invention would be a condensing sidearm heat exchanger synergistically attached to a water heater tank.
  • the heated water would be transferred from a side-arm heat exchanger to the tank by thermosiphonic action, or through heat- induced density changes in the water acting as a driver. No mechanical pumps would be necessary.
  • the water tank could be an electric resistance tank with the elements removed. plumbed into the openings where the original elements had previously been placed.
  • the heat exchanger would have sufficient heat transfer so as to condense the water vapor present in the combustion products.
  • the combustion products would be too cool to buoyantly self- vent, so an electric fan would be used to vent the combustion products.
  • an electric fan would be used to vent the combustion products.
  • the bottom of the heat exchanger would be connected to the lower end of the tank.
  • the combustion products would exit the heat exchanger at the lower end where they would be cooled by the coldest water in the tank.
  • thermosiphon action to transfer heated water to the tank, the flow rate will be slow enough to preserve stratification in the tank. This keeps cold water in the bottom of the tank even as the rest of the water in the tank heats up.
  • the heat transfer efficiency is high, as is usually the case in counterflow heat exchangers. This will maximally cool the combustion products and condense as much of the water vapor in the combustion products as possible.
  • the combustion products are cool enough so they can be vented to the outdoors through an attached plastic pipe. Inlet air can be drawn in through plastic pipe from outdoors as well. This would be an isolated combustion system thereby removing accidental sources of ignition of flammable vapors. Flammable vapor ignition resistant designs will not have to be used on this water heater. If the burner is made small enough (perhaps as low as 15kBtu/hr), the motor on the draft inducer fan can be powered with low- voltage electricity. This would enable installers to provide power to the water heater without needing the services of an electrician.
  • This invention allows water to be heated much more efficiently ( ⁇ 90% compared to current typical water heater efficiencies of 60%).
  • FIG. 1 shows in a cut away view a few of the salient features of a prior art electrical water heater 100.
  • the electrical water heater 100 has an interior heated space 110 that is typically filled with water.
  • the heated space 110 is substantially surrounded by insulation 120.
  • An upper electrical heating element 130 and lower electrical heating element 140 provide heat to the heated space 110, and are inserted through and secured to the upper threaded aperture 150 for the upper element 130, and the lower threaded aperture 160 for the lower heating element 140.
  • the heat exchanger/burner assembly lower threaded aperture 160 should be mounted as low as possible on the tank, perhaps even extending below the bottom of the tank (which is not shown in Figure 1). Of course in the case if retrofitting an electrically heated tank, this is difficult or impossible to achieve.
  • retrofitting an electrical water heater could be made from non-electrical water heater components, and suitably combined. retrofitting or new construction of the electrical water heater 100 of Figure 1.
  • an interior space 205 is filled with water, which is insulated from external temperatures by insulation 210.
  • the upper 130 and lower 140 electrical water heating elements have been removed.
  • a recirculation line 215 forms a loop between the upper aperture 270 and the lower aperture 275, which may have contained the upper 130 and lower 140 electrical water heating elements from Figure 1, or may just be new apertures in a tank as built.
  • the recirculation line 215 has surrounding it heat transfer elements 220 that are in good thermal contact with the recirculation line 215.
  • a supply of air enters through aperture 225, to provide oxidizer to a burner 230.
  • Combustion byproducts are pulled down through the heat transfer elements 220, and pulled through an exhaust pipe 235 that pumps the exhaust byproducts to an exit vent 250 by virtue of a fan blower 240.
  • One of the combustion byprodiicts is that of condensed water vapor, which drips onto a collection area 255 below the heat transfer elements 220.
  • the condensate is then exhausted through a drip pipe 260.
  • An insulated housing 265 surrounds the heat transfer elements 220, and the burner 230.
  • the insulated housing 265 is attached to the insulation 210 of the interior space 205.
  • Power for the fan blower 240 may be supplied externally, though may better be provided by a thermopile supply 280 that would be mounted in close proximity to the burner 230. Wires are not shown to the fan blower 240, as such wiring would be obvious.
  • Operation of the system is controlled by an upper thermostat at 270 and lower thermostat at 275.
  • This invention is intended as a replacement for currently existing residential gas water heaters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)

Abstract

L'invention concerne un appareil offrant un chauffe-eau à bras latéral de condensation présentant un rendement amélioré. L'élément de bras latéral de condensation recycle les gaz d'échappement pour chauffer la partie plus froide d'un réservoir de chauffe-eau en recourant à l'effet de thermosiphon (ou de flottabilité) dans une configuration à contre-courant, augmentant ainsi le rendement du chauffe-eau.
PCT/US2007/072160 2006-06-26 2007-06-26 Chauffe-eau à bras latéral de condensation Ceased WO2008002940A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/306,190 US20090188447A1 (en) 2006-06-26 2007-06-26 Condensing Side-Arm Water Heater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80581106P 2006-06-26 2006-06-26
US60/805,811 2006-06-26

Publications (2)

Publication Number Publication Date
WO2008002940A2 true WO2008002940A2 (fr) 2008-01-03
WO2008002940A3 WO2008002940A3 (fr) 2009-05-14

Family

ID=38846488

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/072160 Ceased WO2008002940A2 (fr) 2006-06-26 2007-06-26 Chauffe-eau à bras latéral de condensation

Country Status (2)

Country Link
US (1) US20090188447A1 (fr)
WO (1) WO2008002940A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2313284B1 (fr) * 2008-07-29 2019-10-16 Ventech, LLC Système de chauffage supplémentaire incluant un échangeur thermique intégral
WO2010042171A2 (fr) * 2008-10-06 2010-04-15 Sunrise Intellectual Property Llc Système de chauffage d’eau chaude solaire à auto-pompage adaptatif muni d’une protection contre la surchauffe
US9273880B2 (en) * 2013-08-14 2016-03-01 Elwha Llc Heating device with condensing counter-flow heat exchanger
US10921025B2 (en) 2015-07-22 2021-02-16 National Machine Group Hot water tank
US10711795B2 (en) 2016-07-27 2020-07-14 Regal Beloit America, Inc. Cover assembly, blower assembly and associated method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512318A (en) * 1947-05-14 1950-06-20 Clara E Fiene Hydrostatic siphon circulation control for thermosiphon heat transfer systems
US4403572A (en) * 1980-05-16 1983-09-13 Advanced Mechanical Technology, Inc. Combustion product condensing water heater
US4535931A (en) * 1983-09-14 1985-08-20 Kenneth W. Scott Energy conserving water heater control system
US4790268A (en) * 1985-02-14 1988-12-13 A. O. Smith Corporation Submersible chamber water heater
US5020721A (en) * 1989-09-19 1991-06-04 Gas Fired Products Rapid recovery gas hot water heater
US5879148A (en) * 1993-03-19 1999-03-09 The Regents Of The University Of California Mechanical swirler for a low-NOx, weak-swirl burner
CA2130961C (fr) * 1993-12-01 2004-01-20 Henry Jack Moore Jr. Chauffe-eau a tirage induit des produits de combustion
US7346274B2 (en) * 1999-07-27 2008-03-18 Bradenbaugh Kenneth A Water heater and method of controlling the same
JP4023139B2 (ja) * 2001-04-04 2007-12-19 株式会社デンソー ハイブリッド給湯装置

Also Published As

Publication number Publication date
WO2008002940A3 (fr) 2009-05-14
US20090188447A1 (en) 2009-07-30

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