EP0493665B2 - Heat-exchanger and process for producing a lamella for a heat-exchanger - Google Patents
Heat-exchanger and process for producing a lamella for a heat-exchanger Download PDFInfo
- Publication number
- EP0493665B2 EP0493665B2 EP91119203A EP91119203A EP0493665B2 EP 0493665 B2 EP0493665 B2 EP 0493665B2 EP 91119203 A EP91119203 A EP 91119203A EP 91119203 A EP91119203 A EP 91119203A EP 0493665 B2 EP0493665 B2 EP 0493665B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutouts
- heat exchanger
- lamella
- exchanger according
- hot
- 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.)
- Expired - Lifetime
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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
-
- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
- F28F1/325—Fins with openings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
Definitions
- the invention relates to a heat exchanger according to the genus of the main claim.
- a known heat exchanger of this type AT-A-391 022 is about the exhaust gas temperature to prevent condensation to bring sufficient height, a variable number removable slats available.
- As another Measure is proposed, which is between adjacent tubes extending walls make the slats removable in certain areas, around their heat transfer surface if necessary to reduce and thereby the exhaust gas temperature to increase.
- This version requires a subsequent one Processing of the fully assembled heat exchanger.
- slats like fixed and removable slats or Slats with break-out wall parts required.
- the arrangement according to the invention characteristic features of the main claim has the advantage that the Recesses can influence the heat flow so that a predeterminable temperature gradient trained along the lamella in the flow direction. Areas can be very different Avoid temperature and the maximum temperature difference at the opposite ends of the Keep the slat small.
- the ratios of the opening angles move as well as the relationships from the distance of one Recess to the edge of a hot water pipe and its radius in certain areas corrosion behavior by reducing the Temperature gradients in the flow direction of the Improve exhaust gas.
- FIG. 1 shows a heat exchanger in side view
- Figure 2 is a plan view of the heat exchanger, partly cut according to line II-II in Figure 1.
- Figure 3 shows a lamella and Figure 4 a design of the recesses.
- Figure 5a to e are versions of different recesses shown and Figure 5f shows a variant of Hot water pipe according to Figure 1.
- FIG. 1 shows a typical application a second-circuit heat exchanger 10 with one in the heating water pipes 12 led water pipe coil 14.
- the water flows through an inlet 15 an upper coil 16 consisting of tubes 17 and horizontal elbows 18, over a vertical one Manifold 19 in a lower serpent 20, consisting of tubes 21 and horizontal Bends (not shown in the drawing) and from there via an outlet 24 into the not shown Service water network.
- the heating circuit without external circulation can essentially be operated from an inlet chamber 26, a collecting or. Deflection chamber 27, an outlet chamber 28 and a heating network, not shown.
- the Chambers 26 and 27 or 27 and 28 are respectively connected to each other via parallel heating water pipes 12.
- the process water pipe coil 14 is by means of Copper profile rails 30 against the heating water pipes 12 supported.
- the copper profile rails 30 can on both sides between the upstream edge of the Edelwasserrohres 12 and the tubes 21 of the lower Snake 20 and the tubes 17 of the top Snake 16 and the downstream end of the Heating water pipes 12 may be inserted ( Figure 1) or only in the upstream area (Figure 5f), wherein the tubes 17 of the upper coil 16 directly to the downstream edge of the heating water pipes 12 pressed will.
- the heating water pipes 12 are surrounded by one Variety of slats 32, which passages 34 own the shape of the heating water pipes are adapted and incorporate them. Between the exhaust gas upstream edge 36 and the exhaust gas upstream edge 38 of the passage 34 there are recesses 40, 41 between which a web 42 is formed.
- the slats 32 can be made of copper or other materials consist. When using copper, the Heat spread on the lamella 32 through the Cutouts are so hampered that despite none of the high thermal conductivity coefficient of copper Areas with temperatures below the dew point temperature form.
- the shape of the cutouts 40, 41 is matched to the shape of the edge 38 on the exhaust gas inflow side and runs at a distance 44 therefrom.
- the opening angles ⁇ 1 and ⁇ 2 seen from the lower center 46 limit the cutouts 40, 41 and the web 42 in the circumferential direction.
- the size of the area of the recesses 48 is determined by the performance of the water heater, into the one equipped with these slats Heat exchanger is installed, determined.
- FIG. 5 shows other possible shapes and Positions for the recesses controlling the heat flow 40, 41 and the recess 48 for power adjustment.
- FIG. 5a shows a recess 60 in the form of an arc
- FIG. 5b an arcuate Recess 62 with a web
- the Figure 5c with an arcuate recess 64 two webs 65.
- Figure 5d is a straight recess 66 and in FIG. 5e several are straight, recesses 68 distributed in the arc are shown.
- the recesses intended for performance adjustment can of triangular shape 70, more rectangular Form 71 to 73 or round form 74 and can both on the exhaust gas inflow side Edge 36, the exhaust gas downstream edge 50 as also bring in the middle of the slat, taking it is not necessary, the recesses 70 to 74 always to position between the passages. It is also several different shapes possible combine.
Description
Die Erfindung bezieht sich auf einen Wärmeübertrager nach der Gattung des Hauptanspruchs. Bei einem bekannten Wärmeübertrager dieser Gattung AT-A-391 022 ist, um die Abgastemperatur auf eine zur Verhinderung einer Kondensatbildung ausreichende Höhe zu bringen, eine variable Anzahl lösbarer Lamellen vorhanden. Als weitere Maßnahme wird vorgeschlagen, die sich zwischen benachbarten Rohren erstreckenden Wandungen der Lamellen bereichsweise entfernbar zu gestalten, um ihre wärmeübertragende Fläche bedarfweise zu verringern und dadurch die Abgastemperatur zu erhöhen. Dazu sind Aussparungen in der Lamelle vorgesehen, die die ausbrechbaren Wandungsteile mit Ausnahme kleiner Stege umschließen und das mechanische Ausbrechen ermöglichen.The invention relates to a heat exchanger according to the genus of the main claim. In a known heat exchanger of this type AT-A-391 022 is about the exhaust gas temperature to prevent condensation to bring sufficient height, a variable number removable slats available. As another Measure is proposed, which is between adjacent tubes extending walls make the slats removable in certain areas, around their heat transfer surface if necessary to reduce and thereby the exhaust gas temperature to increase. There are recesses in the slat provided the the breakout wall parts enclose with the exception of small webs and allow mechanical breakout.
Diese Ausführung erfordert eine nachträgliche Bearbeitung des fertig montierten Wärmeübertragers. Außerdem werden unterschiedliche Lamellentypen wie festmontierte und lösbare Lamellen oder Lamellen mit ausbrechbaren Wandteilen benötigt.This version requires a subsequent one Processing of the fully assembled heat exchanger. There are also different types of slats like fixed and removable slats or Slats with break-out wall parts required.
Die erfindungsgemäße Anordnung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß sich durch die Aussparungen der Wärmefluß so beeinflussen läßt, daß sich ein vorbestimmbarer Temperaturgradient entlang der Lamelle in Strömungsrichtung ausbildet. Es lassen sich Bereiche stark abweichender Temperatur vermeiden und die maximale Temperaturdifferenz an den gegenüberliegenden Enden der Lamelle klein halten.The arrangement according to the invention characteristic features of the main claim has the advantage that the Recesses can influence the heat flow so that a predeterminable temperature gradient trained along the lamella in the flow direction. Areas can be very different Avoid temperature and the maximum temperature difference at the opposite ends of the Keep the slat small.
Ferner läßt sich auf diese Weise bei gegebener Abgastemperatur auch bei niedrigen Warmwasserbzw. Heizwassertemperaturen ein Unterschreiten der Taupunkttemperatur vermeiden.It can also be given in this way Exhaust gas temperature even at low hot water or Heating water temperatures below avoid the dew point temperature.
Durch die in den Unteransprüchen enthaltene Merkmale sind vorteilhafte Weiterbildungen der Anordnung nach dem Hauptanspruch möglich.By the contained in the subclaims Features are advantageous developments of the arrangement possible after the main claim.
Liegen die Aussparungen überwiegend im vom heißen Abgas angeströmen Bereich der Lamelle, führt dies zu einem kleinen Temperatgradienten in der Lamelle in Strömungsrichtung, so daß sich insbesondere über den Bereich der Lamellenhöhe eine geringe und gleichmäßige Bildung von Korrosionsprodukten ergibt. Dies gewährleistet eine lange Betriebszeit des Wärmeübertragers, bevor es zu einer Drosselung des Durchtrittsquerschnitts durch Zusetzen der Lamellenzwischenräume mit Kupfersulfat kommt.Are the cutouts predominantly in the hot exhaust gas flow area of the lamella, this leads to a small temperature gradient in the lamella in the direction of flow, so that especially over the area of the slat height a low and even formation of corrosion products results. This ensures a long Operating time of the heat exchanger before it throttling the passage cross-section by clogging the lamella gaps with Copper sulfate is coming.
Ein Steg zwischen den Aussparungen, der die anströmseitige Kante der Lamelle mit dem unteren Rand eines Warmwasserrohres direkt verbindet, erwirkt einen nicht unterbrochenen Wärmefluß in der Achse der Lamelle und verringert die Verzunderung am Lamellenfuß.A bridge between the cutouts that the upstream edge of the slat with the lower Edge of a hot water pipe connects directly, an uninterrupted heat flow in the Axis of the lamella and reduces scaling on the slat base.
Durch Anpassung der Form der Aussparungen an die Form der Warmwasserrohre und durch Anbringen der Aussparungen in einem definierten, vorzugsweise konstanten Abstand vom Rand der Warmwasserrohre erhöht sich die Stabilität der Lamelle, die sich dadurch besser montieren und verlöten läßt.By adjusting the shape of the recesses to the shape of the hot water pipes and by attaching them of the recesses in a defined, preferably constant distance from the edge of the Hot water pipes increase the stability of the slat, that fit and solder better leaves.
Bewegen sich die Verhältnisse der Öffnungswinkel sowie die Verhältnisse vom Abstand einer Aussparung zum Rand eines Warmwasserrohres und dessen Radius in bestimmten Bereichen, läßt sich das Korrosionsverhalten durch Verringern des Temperaturgradienten in Strömungsrichtung des Abgases verbessern.The ratios of the opening angles move as well as the relationships from the distance of one Recess to the edge of a hot water pipe and its radius in certain areas corrosion behavior by reducing the Temperature gradients in the flow direction of the Improve exhaust gas.
Eine Einsparung der Werkzeug- und Lagerkosten kann erzielt werden, wenn in eine einheitliche Grundlamelle Aussparungen zur Steuerung des Wärmeflusses gestanzt werden. Die Aussparungen können dabei in Größe, Form und Position so variiert werden, daß sich Lamellen für Wärmeübertrager verschiedener Leistungskategorien herstellen lassen.Saving tool and storage costs can be achieved if in a uniform Basic lamella cutouts for controlling the Heat flow are punched. The cutouts can do so in size, shape and position be varied that fins for heat exchangers different performance categories to let.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung unter Angabe weiterer Vorteile näher erläutert. Es zeigt Figur 1 einen Wärmeübertrager in Seitenansicht, Figur 2 eine Draufsicht des Wärmeübertragers, teilweise geschnitten nach Linie II-II in Figur 1. Figur 3 zeigt eine Lamelle und Figur 4 eine Gestaltung der Aussparungen. In Figur 5a bis e sind Ausführungen verschiedener Aussparungen dargestellt und Figur 5f zeigt eine Variante des Warmwasserrohres gemäß Figur 1.Embodiments of the invention are in the Drawing shown and in the following Description with further advantages explained. 1 shows a heat exchanger in side view, Figure 2 is a plan view of the heat exchanger, partly cut according to line II-II in Figure 1. Figure 3 shows a lamella and Figure 4 a design of the recesses. In Figure 5a to e are versions of different recesses shown and Figure 5f shows a variant of Hot water pipe according to Figure 1.
In einer typischen Anwendung zeigt Figur 1
einen Zweitkreis-Wärmeübertrager 10 mit einer in
den Heizwasserrohren 12 geführten Brauchwasserrohrschlange
14. In die Brauchwasserrohrschlange
14 fließt das Wasser über einen Einlaß 15 durch
eine obere Schlange 16, bestehend aus Rohren 17
und waagerechten Krümmern 18, über einen senkrechten
Krümmer 19 in eine untere Schlange
20,bestehend aus Rohren 21 und waagerechten
Krümmern (in der Zeichnung nicht zu sehen) und
von dort über einen Auslaß 24 in das nicht dargestellte
Brauchwassernetz.1 shows a typical application
a second-
Der Heizkreislauf, der ohne externe Umwälzung
betrieben werden kann, besteht im wesentlichen
aus einer Einlaßkammer 26, einer Sammelbzw.
Umlenkkammer 27, einer Auslaßkammer 28
und einem nicht dargestellten Heizungsnetz. Die
Kammern 26 und 27 bzw. 27 und 28 sind jeweils
über parallele Heizwasserrohre 12 miteinander verbunden.The heating circuit without external circulation
can essentially be operated
from an
Die Brauchwasserrohrschlange 14 ist mittels
Kupferprofilschienen 30 gegen die Heizwasserrohre
12 abgestützt. Die Kupferprofilschienen 30 können
beidseitig zwischen anströmseitigem Rand des
Heizwasserrohres 12 und den Rohren 21 der unteren
Schlange 20 und den Rohren 17 der oberen
Schlange 16 und den abströmseitigen Ende der
Heizwasserrohre 12 eingefügt sein (Figur 1) oder
nur im anströmseitigen Bereich (Figur 5f), wobei
die Rohre 17 der oberen Schlange 16 direkt an den
abströmseitigen Rand der Heizwasserrohre 12 gepreßt
werden. Durch das Einbringen der Kupferprofilschienen
30 fließt die Wärme direkt von den
Lamellen 32 zu den Brauchwasserrohren 21, womit
sich bei Zweikreiswärmeübertrager für Heizkreisläufe
ohne externe Umwälzung Siedegeräusche
vermeiden lassen.The process
Die Heizwasserrohre 12 sind umgeben von einer
Vielzahl von Lamellen 32, welche Durchgänge
34 besitzen, die der Form der Heizwasserrohre
angepaßt sind und diese in sich aufnehmen. Zwischen
der abgasanströmseitigen Kante 36 und
dem abgasanströmseitigen Rand 38 des Durchganges
34 befinden sich Aussparungen 40, 41, zwischen
denen ein Steg 42 gebildet ist. Die Lamellen
32 können aus Kupfer oder anderen Materialien
bestehen. Bei Verwendung von Kupfer kann die
Wärmeausbreitung auf der Lamelle 32 durch die
Aussparungen so behindert werden, daß sich trotz
des hohen Wärmeleitkoeffizienten von Kupfer keine
Bereiche mit Temperaturen unterhalb der Taupunktstemperatur
bilden.The
Die Form der Aussparungen 40, 41 ist der
Form des abgasanströmseitigen Randes 38 angeglichen
und verläuft im Abstand 44 zu diesem. Die
von dem unteren Mittelpunkt 46 aus gesehenen
Öffnungswinkel α1 und α2 begrenzen die Aussparungen
40, 41 sowie den Steg 42 in Umfangsrichtung.The shape of the
In einer vorteilhaften Ausgestaltung betragen
die Winkel α1 = 20° und α2 = 144°, der Radius
r1 = 6,8 mm und der Abstand 44, 3,2 mm.In an advantageous embodiment, the angles α 1 = 20 ° and α 2 = 144 °, the radius r 1 = 6.8 mm and the
In die Lamelle 32 sind weitere Aussparungen
48 an der abgasabströmseitigen Kante 50 eingebracht.
Diese sind von dreieckiger Form, weisen
mit einer Ecke in die Lamellenmitte und sind symmetrisch
zwischen den Durchgängen 34 positioniert.Further recesses are in the
Die Größe der Fläche der Aussparungen 48
wird durch die Leistungsstärke des Wassererhitzers,
in den der mit diesen Lamellen bestückte
Wärmeübertrager eingebaut wird, bestimmt.The size of the area of the
Die Figur 5 zeigt weitere mögliche Formen und
Positionen für die den Wärmefluß steuernden Aussparungen
40, 41 und die Aussparung 48 zur Leistungsanpassung.
Es zeigen die Figur 5a eine Aussparung
60 in Bogenform, die Figur 5b eine bogenförmige
Aussparung 62 mit einem Steg und die
Figur 5c eine bogenförmige Aussparung 64 mit
zwei Stegen 65. In Figur 5d ist eine gerade Aussparung
66 und in Figur 5e sind mehrere gerade,
im Bogen verteilte Aussparungen 68 dargestellt.
Die zur Leistungsanpassung vorgesehene Aussparungen
können von dreieckiger Form 70, rechteckiger
Form 71 bis 73 oder runder Form 74 sein und
lassen sich sowohl an der abgasanströmseitigen
Kante 36, der abgasabströmseitigen Kante 50 als
auch in der Mitte der Lamelle einbringen, wobei es
nicht nötig ist, die Aussparungen 70 bis 74 immer
zwischen den Durchgängen zu positionieren. Es ist
auch möglich mehrere verschiedene Formen zu
kombinieren.Figure 5 shows other possible shapes and
Positions for the recesses controlling the
Bei der Herstellung der Lamelle 32 werden
ausgehend von einer Grundlamelle, in der nur die
Durchgänge 34 eingebracht sind und die für sämtliche
Wärmeübertrager einer Baureihe unterschiedlicher
Leistungsstufen gleich ist, zur Steuerung des
Wärmeflusses und/oder zur Leistungsanpassung
Aussparungen geeigneter Form, Größe und Position
nachträglich ausgestanzt.In the manufacture of the
Claims (12)
- Heat exchanger, having tubes occupied by a multiplicity of lamellae and having cutouts which are introduced into the lamellae and influence the heat transfer, characterized in that the cutouts (40, 41) are introduced into the lamellae (32) in the high-temperature region, essentially between those edges (36) of the lamellae (32) which, during operation, are flowed against by the waste gas and rims (38), flowed against by the waste gas, of the passages (34) through the lamellae (32), which passages receive the tubes (12), so as to produce an even temperature distribution and the least possible maximum temperature difference on the lamella (32), no passages (34) being present between the flowed-against edges and the cutouts.
- Heat exchanger according to Claim 1, characterized in that the cutouts (40, 41) are provided predominantly in the flow-side region (36) of the lamella (32).
- Heat exchanger according to Claim 1 or 2, characterized in that the cutouts (40, 41) are distributed in a semi-circle around the hot-water tubes (12).
- Heat exchanger according to one of Claims 1 to 3, characterized in that a plurality of cutouts (40, 41) are distributed around each hot-water tube (12).
- Heat exchanger according to Claim 4, characterized in that between the cutouts (40, 41) there are formed webs (42), at least one web (42), in each case, directly connecting the flow-side edge (36) of the lamella (32) to the facing rim (38) of a hot-water tube (12).
- Heat exchanger according to Claim 4 or 5, characterized in that the cutouts (40, 41) are regularly distributed and the ratios of the widths of the cutouts (40, 41) and of the webs (42) therebetween are constant.
- Heat exchanger according to one of Claims 1 to 6, characterized in that the shape of the cutouts (40, 41) is matched to the shape of the hot-water tubes (12) and the cutouts (40, 41) are placed at a constant distance from the rim (38) of the hot-water tubes (12).
- Heat exchanger according to one of Claims 6 and 7, characterized in that the aperture angles α1 and α2 of the webs (42) and of the cutouts (40, 41), viewed from a midpoint (46) of a hot-water tube (12), are in a constant ratio to each other.
- Heat exchanger according to Claim 8, characterized in that the ratio of the aperture angles α1 to α2 lies between 1:7 and 1:10.
- Heat exchanger according to Claim 8 or 9, characterized in that the ratio between the distance of a cutout (40, 41) from the rim (38) of a hot-water tube (12) and the radius of the hot-water tube 812 [sic]) lies between 1:1.5 and 1:2.5, preferably at 1:2.
- Heat exchanger according to one of the preceding claims, characterized in that cutouts (48) are provided for adapting the output of the lamella (32) to that of the heat exchanger (10).
- Process for producing a lamella of a heat exchanger according to one of the preceding claims, which lamella exhibits cutouts which influence the heat transfer, these being situated essentially between those edges (36) of the lamellae (32) which, during operation, are flowed against by the waste gas and rims (38), flowed against by the waste gas, of the passages (34) through the lamellae (32), which passages receive the tubes (12), characterized in that in a first step a standard basic lamella having passages (34) for the tubes (12) is produced and in a second step the cutouts (40, 41, 48) for controlling the heat flow and for adapting the output of the lamella (32) to that of the heat exchanger (10) are punched.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4042195A DE4042195A1 (en) | 1990-12-29 | 1990-12-29 | HEAT TRANSFER AND METHOD FOR PRODUCING A SLAT FOR A HEAT EXCHANGER |
| DE4042195 | 1990-12-29 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| EP0493665A2 EP0493665A2 (en) | 1992-07-08 |
| EP0493665A3 EP0493665A3 (en) | 1992-11-19 |
| EP0493665B1 EP0493665B1 (en) | 1995-09-13 |
| EP0493665B2 true EP0493665B2 (en) | 1998-04-15 |
Family
ID=6421663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91119203A Expired - Lifetime EP0493665B2 (en) | 1990-12-29 | 1991-11-12 | Heat-exchanger and process for producing a lamella for a heat-exchanger |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0493665B2 (en) |
| DE (2) | DE4042195A1 (en) |
| ES (1) | ES2077142T5 (en) |
| PT (1) | PT99947B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9310827U1 (en) * | 1993-07-06 | 1993-09-23 | Balcke Duerr Ag | HEAT EXCHANGER FROM SEVERAL EXCHANGER TUBES ARRANGED IN PARALLEL |
| DE10315966B4 (en) | 2003-04-08 | 2007-04-05 | Robert Bosch Gmbh | Heat exchanger |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB696380A (en) * | 1949-11-25 | 1953-08-26 | Junkers & Co | Improvements in heat exchange apparatus |
| DE2813747A1 (en) * | 1978-03-30 | 1979-10-04 | Thermal Waerme Kaelte Klima | HEAT EXCHANGER BLADE AND APPLICATIONS OF THE SAME |
| US4738225A (en) * | 1987-06-03 | 1988-04-19 | Juang Jinn C | Heat transfer apparatus for water heater |
| AT391022B (en) * | 1987-11-03 | 1990-08-10 | Vaillant Gmbh | Heat exchanger |
-
1990
- 1990-12-29 DE DE4042195A patent/DE4042195A1/en not_active Withdrawn
-
1991
- 1991-11-12 DE DE59106481T patent/DE59106481D1/en not_active Expired - Lifetime
- 1991-11-12 EP EP91119203A patent/EP0493665B2/en not_active Expired - Lifetime
- 1991-11-12 ES ES91119203T patent/ES2077142T5/en not_active Expired - Lifetime
- 1991-12-27 PT PT99947A patent/PT99947B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE4042195A1 (en) | 1992-07-02 |
| DE59106481D1 (en) | 1995-10-19 |
| PT99947B (en) | 1999-05-31 |
| EP0493665A2 (en) | 1992-07-08 |
| EP0493665A3 (en) | 1992-11-19 |
| ES2077142T5 (en) | 1998-06-16 |
| PT99947A (en) | 1993-11-30 |
| EP0493665B1 (en) | 1995-09-13 |
| ES2077142T3 (en) | 1995-11-16 |
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