EP3055622A2 - Type amélioré d'échangeur de chaleur pouvant être employé de préférence dans des fours à combustible gazeux - Google Patents

Type amélioré d'échangeur de chaleur pouvant être employé de préférence dans des fours à combustible gazeux

Info

Publication number
EP3055622A2
EP3055622A2 EP14833456.8A EP14833456A EP3055622A2 EP 3055622 A2 EP3055622 A2 EP 3055622A2 EP 14833456 A EP14833456 A EP 14833456A EP 3055622 A2 EP3055622 A2 EP 3055622A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
beads
pipe elements
fact
pipe
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.)
Granted
Application number
EP14833456.8A
Other languages
German (de)
English (en)
Other versions
EP3055622B1 (fr
Inventor
designation of the inventor has not yet been filed The
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.)
Tecnoinox Srl
Original Assignee
Tecnoinox 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 Tecnoinox Srl filed Critical Tecnoinox Srl
Publication of EP3055622A2 publication Critical patent/EP3055622A2/fr
Application granted granted Critical
Publication of EP3055622B1 publication Critical patent/EP3055622B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0042—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for foodstuffs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • Patent application for industrial invention under the title:
  • the object of the present invention is the application of a particular kind of heat exchanger to improve the efficiency of the heat exchange in gaseous fuel ovens.
  • heat exchangers are composed of pipe elements, of suitable length, that start from the gas burner area and extend vertically like "organ pipes” and they present a bead structure carefully studied in order to increase the surface area for heat exchange and alternate sections of the pipes where the hot gases flow slowly and fast. This shape generates some minor pressure losses so that the total time spent by the hot gases in the heat exchangers increases without compromising their regular outflow from the duct and the quality of the combustion. Overall, with such heat exchangers, the heat exchanged with the baking chamber will be more uniform and a smaller amount of energy will flow through the oven outlet duct and be wasted.
  • the most common and well-known heat exchangers use different shapes to spread in the best possible way the heat from the hot gases flowing from the burners. They usually fail to achieve an optimal distribution because of several reasons (shape miscalculated, use wrong materials or the flow is not uniformly hot) therefore it is necessary to use fans to convoy the air from the heat exchanger area to the rest of the oven chamber. As in some cases, the fans in the ovens, over the primary function of evening the temperature in the baking chamber, have also the secondary purpose of cooling and warming the heat exchangers themselves when the heat in the gases within has brisk variations. Thus, the fans also help the heat exchangers to reach a thermal equilibrium. We will not discuss any further the state of art of heat exchangers as experts in the sectors and people who studied heat transfer theory already know well this topic.
  • the purpose of the presented invention is to offer an improved alternative to solve the drawbacks and limitations found on heat exchangers for gas ovens currently in use and on sale.
  • FIG. 1 shows a common gas oven in a three-quarter view
  • FIG. 2 shows the same oven as Figure 1 sketched lightly with the heat exchangers and the burners positioned underneath highlighted by a bolder line
  • FIG. 3 shows only the ensemble heat exchangers - burners as highlighted in Figure 2
  • FIG. 4 is a section view of a heat exchanger where the predicted flow of the hot-burnt gases inside it is sketched.
  • the oven depicted in figure 1 is a standard gas oven F equipped with an outlet vent C, sometimes called chimney, for the outlet of hot-burnt gases already employed to provide heat to the oven F chamber.
  • Such oven is also equipped with devices to force air circulation in the chamber such as one or more fans V placed in the back of the chamber and next to the heat exchangers SC.
  • Figure 2 shows that in the bottom are of the mentioned oven F are positioned one or more burner elements B on top of which several pipe elements T are placed; this follows the standard layout and is nothing new.
  • the new concept is the shape of these pipe elements T that present beads B on their longitudinal development which improve the efficiency of the heat exchange when comparing the presented heat exchangers SC to the current state of art.
  • the first reason is that the beads B cause an increase of the surface area of the heat exchanger SC, precisely between the pipe element T and the baking chamber of the oven F. This is a rather straightforward way to increase the heat exchange.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fuel Cell (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

L'invention concerne un type amélioré d'échangeur de chaleur qui peut être employé de préférence dans des fours à combustible gazeux. Le type amélioré selon l'invention d'échangeurs de chaleur (SC) sont placés dans la cellule d'un four (F), précisément sur son fond, et sont adaptés verticalement sur le dessus des brûleurs (BR). Les échangeurs de chaleur (SC) selon l'invention se caractérisent par la présence de plusieurs éléments tuyaux (T) et en ce que sur ces éléments tuyaux sont formées des billes (B) en direction de la partie intérieure des éléments tuyaux (T). Les échangeurs de chaleur (SC), comme dans la revendication précédente, se caractérisent en ce que les billes (B) sont pratiquées sur les éléments tuyaux (T) des échangeurs de chaleur (SC), (B) sont de préférence placées à l'opposé les unes des autres afin de générer une réduction de la section à l'intérieur des éléments tuyaux (T) de façon à créer une sorte de "venturi". Les échangeurs de chaleur (SC), comme dans la revendication précédente, se caractérisent en ce que, du fait que les billes (B) soient à la fois comprimées contre l'élément tuyau (T) et opposées les unes aux autres, les billes (B) se trouvent appliquées à l'élément tuyau (T) mentionné ci-dessus avec un motif alterné avec un angle préféré de 90 degrés.
EP14833456.8A 2013-10-11 2014-10-11 Four à gaz avec échangeur de chaleur Active EP3055622B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000061A ITPN20130061A1 (it) 2013-10-11 2013-10-11 Scambiatore di calore di tipo perfezionato applicabile preferibilmente a forni a combustibile gassoso
PCT/IB2014/002084 WO2015059537A2 (fr) 2013-10-11 2014-10-11 Type amélioré d'échangeur de chaleur pouvant être employé de préférence dans des fours à combustible gazeux

Publications (2)

Publication Number Publication Date
EP3055622A2 true EP3055622A2 (fr) 2016-08-17
EP3055622B1 EP3055622B1 (fr) 2019-06-19

Family

ID=49841746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14833456.8A Active EP3055622B1 (fr) 2013-10-11 2014-10-11 Four à gaz avec échangeur de chaleur

Country Status (3)

Country Link
EP (1) EP3055622B1 (fr)
IT (1) ITPN20130061A1 (fr)
WO (1) WO2015059537A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL232196B1 (pl) * 2015-07-05 2019-05-31 Aic Spolka Akcyjna Kondensacyjny wymiennik ciepła
PL232219B1 (pl) * 2015-07-05 2019-05-31 Aic Spolka Akcyjna Rura płomienna kondensacyjnego wymiennika ciepła
PL232198B1 (pl) * 2015-07-05 2019-05-31 Aic Spolka Akcyjna Rura płomienna kondensacyjnego wymiennika ciepła

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585059A (en) * 1980-01-15 1986-04-29 H & H Tube & Mfg. Co. Heat transfer tube assembly
DE8412965U1 (de) * 1984-04-27 1984-08-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Tuer fuer den back- und bratraum eines bratofens
IT1267731B1 (it) * 1994-06-22 1997-02-07 Zanussi Grandi Impianti Spa Forno di cottura combiato gas-microonde con funzionalita' vapore
US8459342B2 (en) * 2003-11-25 2013-06-11 Beckett Gas, Inc. Heat exchanger tube with integral restricting and turbulating structure
DE10259058A1 (de) * 2002-12-17 2004-07-01 BSH Bosch und Siemens Hausgeräte GmbH Gargerätetür

Also Published As

Publication number Publication date
ITPN20130061A1 (it) 2015-04-12
EP3055622B1 (fr) 2019-06-19
WO2015059537A2 (fr) 2015-04-30
WO2015059537A3 (fr) 2016-08-11

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