EP0747641A2 - Wärmetauscher mit Brauchwasserleitung, und Heizungsgerät mit einem solchen Wärmetauscher - Google Patents

Wärmetauscher mit Brauchwasserleitung, und Heizungsgerät mit einem solchen Wärmetauscher Download PDF

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Publication number
EP0747641A2
EP0747641A2 EP96201265A EP96201265A EP0747641A2 EP 0747641 A2 EP0747641 A2 EP 0747641A2 EP 96201265 A EP96201265 A EP 96201265A EP 96201265 A EP96201265 A EP 96201265A EP 0747641 A2 EP0747641 A2 EP 0747641A2
Authority
EP
European Patent Office
Prior art keywords
duct
heat exchanger
base plate
water
medium
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Withdrawn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
EP96201265A
Other languages
English (en)
French (fr)
Other versions
EP0747641A3 (de
Inventor
Jan Hubertus Deckers
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.)
HOLDING J.H. DECKERS N.V.
Original Assignee
Dejatech Bv
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
Priority claimed from NL1000319A external-priority patent/NL1000319C2/nl
Application filed by Dejatech Bv filed Critical Dejatech Bv
Publication of EP0747641A2 publication Critical patent/EP0747641A2/de
Publication of EP0747641A3 publication Critical patent/EP0747641A3/de
Withdrawn legal-status Critical Current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
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • 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
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/34—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side

Definitions

  • This invention relates to a heat exchanger, comprising a burner, a flue duct, a heating chamber with heat exchanging elements and a duct for feeding therethrough a medium to be heated, abutting at least partly against the heating chamber, and a combined boiler comprising such heat exchanger.
  • a heat exchanger and combined boiler are known from practice.
  • Both types can be arranged adjacent to the central-heating boiler and, in principle, in both cases, water is heated in the central-heating boiler for a specific purpose, namely space heating, with the heated water being passed through, for instance, radiators, which central-heating water also heats water that is supplied for a different purpose (domestic use).
  • Another recent development comprises the use of a relatively small boiler tank, with a volume of, for instance, 3 liters, which is constantly maintained at a particular temperature and upon tapping is directly additionally heated.
  • the object of the present invention is to provide a compact combined boiler, whereby these drawbacks are avoided.
  • a combined boiler according to the invention is characterized by the features according to the characterizing clause of claim 1.
  • a heat demand can be met substantially directly, both for space heating and for sanitary water heating.
  • the convenience time is short, while no heat is lost if there is no heat demand. This is of importance in particular in the event of prolonged absence of any heat demand for the space heating circuit and/or for the sanitary water circuit. Because only a small amount of heat-transferring medium needs to be pumped round for circulation in the duct arranged closely against the heating chamber, and only a small mass needs to be heated, varying heat demands can be met fast.
  • the or each water duct is internally lined with a plastic which does not affect the quality of the sanitary water.
  • a metal lining can be used too, for instance copper or a copper alloy.
  • the two water ducts are designed with a rectangular cross section, so that the available volume is utilised to a maximum.
  • Both ducts are preferably pressure-resistant to, for instance, 4.5 bar for the central-heating water duct and 12 bar for the sanitary water duct, respectively.
  • a further object of the invention is to provide a heat exchanger of the type described in the preamble, whereby the above-mentioned disadvantages are avoided, while the advantages thereof are maintained, and which heat exchanger is suitable over a relatively large temperature range, in particular also at relatively low temperatures.
  • the heat exchanger according to the invention is characterized by the features according to claim 6.
  • the cover which co-defines the heating chamber, is simply removable, the heating chamber, at least the side of the base plate proximal to the combustion chamber and the heat exchanging elements, and the burner are readily accessible for inspection and maintenance. If during the use of the heat exchanger condensation and/or pollution occurs, the cover can be removed periodically and the different parts can be cleaned. Moreover, when damaged, parts can be simply repaired or replaced. Condensate can be simply collected, for instance in the cover, and be removed after removal of the cover.
  • a further surprising advantage of the heat exchanger according to the invention is that it can be made of relatively shallow design, since a medium-conveying duct is arranged only on one side of the heating chamber. As a result, a compact heat exchanger can be obtained with a sufficient capacity and a low convenience time, that is, bringing the water to the required temperature by means of the heat exchanger takes only little time.
  • the heat exchanger according to the invention is characterized by the features according to claim 7.
  • the flue gases In the first (lower) part of a flue duct connecting to a heat exchanger, the flue gases have the highest temperature and moreover most condensate, and hence pollution, will concentrate there. Since in this embodiment of the heat exchanger this first part of the flue duct still extends within the heat exchanger and is covered by the detachable cover, the residual heat of the flue gases can still be utilized and this part of the flue duct can moreover be simply inspected and cleaned, while the condensate can be simply removed. In this connection, it is advantageous when the first part of the flue duct is at least partly provided with heat exchanging elements which preferably allow easier passage to the flue gases than do the heat exchanging elements in the heating chamber. Thus the residual heat of flue gases is utilized in optimum manner.
  • Fig. 1 shows a front view of a heating apparatus with heat exchanger 1 according to the invention, with open heating chamber 2.
  • the heating chamber 2 is bounded at the back by a base plate 3, at the bottom and the two sides by an upright wall 4 and 4', respectively, and at the top by a burner 5.
  • the burner 5 is preferably of the pre-mix type and can be inserted in the heating chamber or form an integral part thereof.
  • the heating chamber 2 is bounded at the front by a cover 6, removed in Fig. 1, but visible in Fig. 2.
  • a multiplicity of finger-shaped heat exchanging elements, designated fingers 7, extend from the base plate 3 into the heating chamber 2, as far as a point close to, and preferably substantially against, the cover 6 (when fitted; see Fig. 2).
  • the fingers 7 are, for instance, arranged in rows, such that the fingers 7 in adjacent rows are mutually staggered. Thus the fingers 7 define a labyrinthine path through the heating chamber 2.
  • a partition 8 Arranged in the heating chamber 2 is a partition 8 which extends in vertical direction from the top, next to the burner 5, in the direction of the bottom wall 4, parallel to the sidewall 4'.
  • the partition 8 terminates at a distance from the bottom wall 4, thereby defining a passage 9.
  • the partition 8, the adjacent sidewall 4', the base plate 3 and the cover 6 define a flue duct 10 which at one end is in open communication with the rest of the heating chamber 2 via the passage 9 and, at the other end, can be joined to a chimney (not shown) via a chimney opening 11.
  • fingers 7 can be arranged, preferably at greater intervals.
  • a medium-conveying duct 12 having a zigzag course (Fig. 2).
  • This medium-conveying duct 12 has an inlet side 13 adjacent the underside of the heat exchanger, at the lower end of the flue duct 10, and an outlet side 14 basically located adjacent the top of the heat exchanger 1, diametrically opposite the inlet side 13.
  • a connecting tube 14' extends from the outlet side 14 along the sidewall 4' to a point adjacent the underside of the heat exchanger, such that the heat exchanger, at the underside thereof, is connectable to both the supply and the return pipe of a heating circuit (not shown).
  • the medium-conveying duct 12 has, for instance, first a vertical loop at the back of the base plate adjacent (a part of) the flue duct 10 and then a number of horizontal loops arranged above each other on the back of the base plate adjacent the rest of the heating chamber 2 (Fig. 3).
  • a water duct 30 is arranged against the medium-conveying duct 12.
  • This water duct 30 likewise has a meandering configuration, has an inlet 31 adjacent the underside of the heat exchanger 1, adjacent the inlet side 13 of the medium-conveying duct 3, and an outlet 32 adjacent the top of the heat exchanger, adjacent the outlet side 14 of the medium-conveying duct 12.
  • the water duct 30 is incorporable into a sanitary water circuit, with mains water being supplied cold from a water mains pipe (not shown) via the inlet 31 and is passed out through the outlet 32 in heated condition. The operation of the heat exchanger will be further explained hereinafter.
  • the water duct 30 may be lined on the inside thereof with a relatively thin layer of plastic, which does not adversely affect the quality of sanitary water during its course through the water duct 30 and its heating therein.
  • An advantage is that thus, legal regulations are satisfied in different countries without the water duct needing to be designed in, for instance, relatively expensive copper or brass.
  • the water-conveying duct 30, like the rest of the heat exchanger, can be designed, for instance, in aluminum or an alloy thereof, so that the manufacture thereof is relatively cheap.
  • a water duct can be formed, in particular bent, from a metal pipe or tube, which, prior to the formation of the base plate and the like, is thereafter placed in the die, whereafter the further heat exchanger is die-cast around the water duct. In this way an economically advantageous, safe heat exchanger is obtained.
  • a cover 6 is adapted to be clamped against the base plate 3 by means of four clamps 15, the cover 6 engaging the base plate and/or the walls 4, 4' in sealing gastight manner, optionally with interposition of a packing suitable therefor.
  • the clamps 15 are designed as so-called quick acting clamps or comparable clamps. In a first position the cover 6 is pressed down against the base plate 3 by means of the clamps 15, in a second position the cover 6 can be removed. For instance by means of a lever, the clamps are simply movable between the first and the second position. It is noted that all kinds of other relatively simply detachable fastening means can be used, such as clamping springs, (wing) screws, sliding means and the like.
  • the heat exchanger 1 can function as follows, assuming it is included in a suitable heating circuit and connected to a suitable fuel supply.
  • the burner Upon a demand for heated sanitary water, the burner will be set into operation, whereby water heated in the medium-conveying duct will be returned directly from the outlet side of the medium-conveying duct 12 to the inlet side and be reheated. During the passage of the medium-conveying duct 12, water in the water duct 30 is then heated to the desired temperature by heat exchange. Since only a relatively small amount of medium (water or, for instance, oil) needs to be heated in the medium-conveying duct 12, the stored heat in the heat exchanging element's own mass is large and the path to be covered is short, the convenience time, that is, the time elapsing between the registration of the heat demand and this demand being met, is particularly short.
  • medium water or, for instance, oil
  • the burner 5 can be switched off and the cover be removed upon release of the clamps 15.
  • the cover 6 inter alia the heating chamber 2, the first part of the flue duct 10 and the burner 5 can be inspected and cleaned.
  • water of condensation if any, can be removed and so can other kinds of pollution.
  • the operation of the burner 5 can be checked, for instance by checking the heat exchanger 1 for discolorations, since more strongly heated parts will discolor differently from less heated parts.
  • the cover 6 can be simply re-placed, whereafter the heating apparatus can directly be set into operation again. The removal of the cover does not require that water be drained or otherwise precautions be taken other than switching off the burner.
  • the base plate 3 is manufactured by die-casting or sand casting, preferably integrally with the sidewalls 4, 4', the fingers 7, the partition 8, the medium-conveying duct 12, the water duct 30 and/or the burner 5.
  • the cover 6, too may be manufactured by casting.
  • the parts referred to are preferably manufactured from aluminum or an aluminum alloy or like light metal. These have a favorable weight and favourable manufacturing and heat-technical characteristics.
  • Fig. 3 shows an alternative embodiment of a heating apparatus according to the invention, in which a gas block 40 and a fan 41 with a burner and a circulation pump 42 are arranged adjacent the lower end of the base plate 3, with the combustion chamber 43 being box-shaped.
  • the heat exchanger has, for instance, a width of between 200 and 450 mm and a height of between 300 and 600 mm.
  • the depth of the heating chamber is, for instance, approximately 70-80 mm, the maximum depth of the cover approximately 120 mm, adjacent the connection for the chimney.
  • the flue duct extends into the heating chamber for a length of, for instance, approximately 500 mm.
  • the medium-conveying duct 12 has a shape and cross section such that per hour for instance 300 to 1000 liters of water or any other such medium can flow through it, the water duct is so dimensioned that per hour for instance 150 to 450 liters can flow through it.
  • the medium-conveying duct 12 and the water duct 30 have a substantially rectangular, round or oval cross-section.
  • the heating element's own mass is, for instance, 20 kg in a design of aluminum or an alloy thereof.
  • the water duct 30 has relatively much surface of contact, so that heat exchange can occur rapidly and energetically favorably.
  • a combined boiler according to the invention is very compact, has a high output and a high efficiency.
  • the medium-conveying duct 12 is preferably resistant to a pressure of more than 4.5 bar, the water duct 30 preferably up to a pressure of at least 12 bar.
  • the invention is not limited in any way to the embodiments represented in the specification and drawings.
  • different heat exchanging elements can be used and different arrangements thereof.
  • they can be omitted in the flue duct.
  • the flue duct may extend entirely outside the heating chamber or be incorporated therein for a larger part, for instance by arranging one or more further partitions.
  • the cover may be designed differently, optionally in several parts, and may render the heating chamber accessible from a different side.
  • the cover can be secured with a different number of clamps and can otherwise be detachably mounted in any suitable manner.
  • the medium-conveying duct and the water duct may be designed differently, for instance traverse a different course, or be arranged at least partly on other sides of the heat exchanger.
  • the cover may be replaced by a different covering, for instance fixedly connected with the base plate.

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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)
  • Details Of Fluid Heaters (AREA)
EP96201265A 1995-05-08 1996-05-08 Wärmetauscher mit Brauchwasserleitung, und Heizungsgerät mit einem solchen Wärmetauscher Withdrawn EP0747641A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000319A NL1000319C2 (nl) 1994-12-19 1995-05-08 Warmtewisselaar met tapwaterkanaal en verwarmingsinrichting voorzien van een dergelijke warmtewisselaar.
NL1000319 1995-05-08

Publications (2)

Publication Number Publication Date
EP0747641A2 true EP0747641A2 (de) 1996-12-11
EP0747641A3 EP0747641A3 (de) 1997-06-18

Family

ID=19760999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96201265A Withdrawn EP0747641A3 (de) 1995-05-08 1996-05-08 Wärmetauscher mit Brauchwasserleitung, und Heizungsgerät mit einem solchen Wärmetauscher

Country Status (1)

Country Link
EP (1) EP0747641A3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8702303A (nl) * 1987-09-25 1989-04-17 Wetering Gemeenschappelijk Bez Verwarmingstoestel.
WO1993012389A1 (en) * 1991-12-09 1993-06-24 Cts S.R.L. Quick operating heat exchanger device
DE4223799A1 (de) * 1992-07-20 1994-01-27 Stiebel Eltron Gmbh & Co Kg Gasheizgerät
NL9202045A (nl) * 1992-11-24 1994-06-16 Intergas B V Verwarmingstoestel.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8702303A (nl) * 1987-09-25 1989-04-17 Wetering Gemeenschappelijk Bez Verwarmingstoestel.
WO1993012389A1 (en) * 1991-12-09 1993-06-24 Cts S.R.L. Quick operating heat exchanger device
DE4223799A1 (de) * 1992-07-20 1994-01-27 Stiebel Eltron Gmbh & Co Kg Gasheizgerät
NL9202045A (nl) * 1992-11-24 1994-06-16 Intergas B V Verwarmingstoestel.

Also Published As

Publication number Publication date
EP0747641A3 (de) 1997-06-18

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