DE4325171A1 - Air-vapour (air-steam) heat exchanger - Google Patents

Air-vapour (air-steam) heat exchanger

Info

Publication number
DE4325171A1
DE4325171A1 DE19934325171 DE4325171A DE4325171A1 DE 4325171 A1 DE4325171 A1 DE 4325171A1 DE 19934325171 DE19934325171 DE 19934325171 DE 4325171 A DE4325171 A DE 4325171A DE 4325171 A1 DE4325171 A1 DE 4325171A1
Authority
DE
Germany
Prior art keywords
steam
heat exchanger
air heat
exchanger according
air
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Withdrawn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
DE19934325171
Other languages
German (de)
Inventor
Patrick Mueller
Peter Mueller
Norbert Dr Deusen
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to DE19934325171 priority Critical patent/DE4325171A1/en
Publication of DE4325171A1 publication Critical patent/DE4325171A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • F28B9/02—Auxiliary systems, arrangements, or devices for feeding steam or vapour to condensers
    • 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
    • F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
    • F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/22—Liquid cooling characterised by evaporation and condensation of coolant in closed cycles; characterised by the coolant reaching higher temperatures than normal atmospheric boiling-point
    • F01P2003/2214—Condensers
    • F01P2003/2221—Condensers of the horizontal type

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

In order in the case of vaporisation cooling (transpiration cooling) systems for internal combustion engines in motor vehicles to ensure that a high rate of condensation is always achieved, measures are proposed for the uniform distribution of the vapour flow (steam flow) over all the cooling pipes and for facilitating the drainage of the condensate from the condenser in air-vapour heat exchangers according to the principle of the cross-flow radiator.

Description

Die Erfindung bezieht sich auf eine Vorrichtung der im Oberbegriff des 1. Anspruchs angegebenen Art.The invention relates to a device in Preamble of the first claim specified art.

Bisher hat man bei Fahrzeugen mit Verdampfungskühl­ systemen als Kondensator einen üblichen Querstromkühler verwendet, wie er bei Brennkraftmaschinen mit reiner Flüssigkeitskühlung, sprich Wasserkühlung, allgemein üb­ lich ist.So far, you have in vehicles with evaporative cooling systems as a condenser a common cross flow cooler used as it is in internal combustion engines with pure Liquid cooling, i.e. water cooling, generally common is.

Nachteilig ist es hierbei, daß derartige für Flüssig­ keitskühlsysteme konzipierte Querstromkühler bei einem Einsatz als Kondensator nicht optimal genutzt werden kön­ nen, weil das Kondensat die Rohre teilweise blockiert. Infolgedessen werden nicht alle Rohre gleichmäßig mit Dampf beaufschlagt, so daß es bei ungünstigen Verhält­ nissen (z. B. langsame Bergfahrt, Schrägstellung des Fahr­ zeugs, Heißleerlauf) vorkommen kann, daß gerade die Rohre durch kondensiertes Kühlmittel blockiert werden, die luftseitig gut umströmt sind. Der Dampf beaufschlagt dann die luftseitig schlecht umströmten Rohre. Dann kann die Gefahr auftreten, daß er nicht mehr kondensiert und der Wärmetauscher durchschlägt, d. h. Dampf tritt in den aus­ laßseitigen Wasserkasten ein. "Wasserkasten" im Sinne dieser Erfindung bezeichnet denjenigen Sammelkasten des Kondensators, in dem das kondensierte Kühlmittel gesam­ melt und aus dem es abgeführt wird.The disadvantage here is that such for liquid cross-flow coolers designed for one Can not be used optimally as a capacitor because the condensate partially blocks the pipes. As a result, not all tubes are even with Steam is applied so that it is in an unfavorable ratio nissen (e.g. slow ascent, inclined driving stuff, hot idling) can occur that just the pipes be blocked by condensed coolant, the are well flowed around on the air side. The steam then acts the pipes with poor airflow. Then she can Danger occur that it no longer condenses and the Heat exchanger breaks through, d. H. Steam escapes into the inlet side water box. "Water box" in the sense  this invention refers to that collection box of Condenser in which the condensed coolant total melt and from which it is discharged.

Aufgabe der vorliegenden Erfindung ist es, unter Beibe­ haltung der Grundkonstruktion eines Querstromwärme­ tauschers die oben beschriebenen Nachteile zu vermeiden, d. h. einen Dampf-/Luftwärmetauscher bereit zu stellen, der unter den üblichen Einsatzbedingungen eine hohe Kon­ densationsrate aufweist.The object of the present invention is under bebe Maintaining the basic construction of a cross-flow heat to avoid the disadvantages described above, d. H. to provide a steam / air heat exchanger, a high con under the usual conditions of use density rate.

Diese Aufgabe wird erfindungsgemäß durch die kennzeich­ nenden Merkmale des 1. Anspruchs gelöst. Hier ist Grund­ gedanke, daß durch konstruktive Maßnahmen dafür gesorgt werden muß, daß der Dampf, der spezifisch leichter als Luft ist, gleichmäßig auf die Rohre des Wärmetauschers so verteilt wird, daß eine gleichmäßige und vollständige Kondensation erreicht wird. Konstruktive Merkmale hierfür schlagen die Ansprüche 2 bis 4 vor. Hierbei ist es nicht unbedingt notwendig, die Verengung, sprich Drosselung, nach Anspruch 4 am Eintritt der Rohre anzuordnen. Es ist vielmehr auch denkbar, die Drosselung im Eintritts­ bereich, also auch einige Zentimeter nach dem Eintritt, vorzusehen.This object is inventively characterized by ning features of the first claim solved. Here is reason thought that taken care of by constructive measures must be that the steam that is specifically lighter than Air is so even on the tubes of the heat exchanger is distributed that an even and complete Condensation is reached. Design features for this propose claims 2 to 4. It is not here absolutely necessary, the narrowing, i.e. throttling, to arrange according to claim 4 at the entrance of the tubes. It is rather conceivable, the throttling in the entrance area, also a few centimeters after entering, to provide.

Werden daneben eines oder mehrere der Merkmale der An­ sprüche 5 bis 7 angewandt, so wird dadurch sicherge­ stellt, daß das Kondensat aus den Rohren auch besser ab­ fließen kann, so daß die Rohre immer alle zur Kondensa­ tion zur Verfügung stehen. Damit wird sichergestellt, daß alle Rohre eine gleiche und hohe Leistung aufweisen.In addition, one or more of the characteristics of the An proverbs 5 to 7 applied, so it is secured represents that the condensate from the pipes also better off can flow so that the pipes always all to the condensate tion are available. This ensures that all pipes have the same and high performance.

Werden die Rohre nach den Merkmalen des Anspruchs 5 aus­ geführt, so können hierbei die Trichterweiten der einzel­ nen Rohre je nach ihrer Lage im Wärmetauscher unter­ schiedlich sein, so daß alleine durch die Ausbildung der Rohre sowohl eine gleichmäßige Verteilung des Dampfstro­ mes auf die Kühlrohre als auch eine verbesserte Konden­ satabfuhr erzielt werden kann.Are the tubes according to the features of claim 5 led, the funnel widths of the individual depending on their location in the heat exchanger be different so that just by training the  Pipes both an even distribution of the steam flow mes on the cooling tubes as well as improved condens sat removal can be achieved.

Die Merkmale des Anspruchs 6 lassen sich dadurch verwirk­ lichen, daß zum einen die Rohre von dem einlaßseitigen Dampfkasten zum auslaßseitigen Wasserkasten schräg ver­ laufen. Eine andere Möglichkeit besteht darin, den ge­ samten Querstromwärmetauscher in Form eines Parallelo­ gramms auszubilden mit erhöhter Dampfeinlaßseite.The features of claim 6 can be realized Lichen that on the one hand the pipes from the inlet side Steam box obliquely ver to the outlet-side water box to run. Another option is to use the ge entire cross-flow heat exchanger in the form of a parallelo to train with an increased steam inlet side.

Auch lassen sich die Merkmale der Ansprüche 6 und 7 mit­ einander kombinieren, so daß die Sicherheit, daß das Kon­ densat abläuft, weiter erhöht wird.The features of claims 6 and 7 can also be used combine each other so that the certainty that the Kon densat expires, is further increased.

Unter dem Begriff "stehend" im Anspruch 7 werden Oval­ rohre verstanden, deren größte Achse vertikal oder nahezu vertikal angeordnet ist.Under the term "standing" in claim 7 are oval understood pipes, the largest axis of which is vertical or nearly is arranged vertically.

Durch einzelne oder eine Kombination mehrerer der vorge­ schlagenen Merkmale wird sichergestellt, daß - unter Bei­ behaltung der wesentlichen Elemente eines Querstromküh­ lers - ein Dampf-/Luftwärmetauscher geschaffen wird, der eine hohe Zuverlässigkeit und Kondensationsrate aufweist. Er eignet sich deshalb besonders zum Einsatz in Kraft­ fahrzeugen.By single or a combination of several of the above features ensures that - under Bei preservation of the essential elements of a cross-flow chiller lers - a steam / air heat exchanger is created that has a high reliability and condensation rate. It is therefore particularly suitable for use in force vehicles.

Claims (7)

1. Dampf-/Luftwärmetauscher, insbesondere für Brenn­ kraftmaschinen mit Verdampfungskühlung, der nach Art eines Querstromkühlers aufgebaut ist mit einem einlaßseitigen Dampf- und auslaßseitigen Wasser­ kasten mit dazwischen liegenden Rohren, dadurch gekennzeichnet, daß in dem einlaßseitigen Dampfkasten Dampfleiteinrichtungen vorgesehen sind.1. Steam / air heat exchanger, in particular for internal combustion engines with evaporative cooling, which is constructed in the manner of a cross-flow cooler with an inlet-side steam and outlet-side water box with pipes in between, characterized in that steam guide devices are provided in the inlet-side steam box. 2. Dampf-/Luftwärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß als Dampfleiteinrich­ tung Leitbleche vorgesehen sind, die den Dampfein­ tritt in die oberen Rohre behindern.2. steam / air heat exchanger according to claim 1, characterized in that as Dampfleiteinrich tion baffles are provided, the steam occurs in the upper tubes hinder. 3. Dampf-/Luftwärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß als Dampfleiteinrich­ tung im Dampfeintrittsbereich eine Gewebeeinlage vorgesehen ist.3. steam / air heat exchanger according to claim 1, characterized in that as Dampfleiteinrich a fabric insert in the steam inlet area is provided. 4. Dampf-/Luftwärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß als Dampfleiteinrich­ tung der Eintrittsquerschnitt zumindest der oberen Rohre verengt ist. 4. steam / air heat exchanger according to claim 1, characterized in that as Dampfleiteinrich tion of the inlet cross-section at least the upper Pipes is narrowed.   5. Dampf-/Luftwärmetauscher nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Rohre trichterför­ mig verlaufen mit auf der Dampfseite liegenden Trichteröffnung.5. Steam / air heat exchanger according to one of the preceding Expectations, characterized in that the tubes funnel-shaped mig run with lying on the steam side Funnel opening. 6. Dampf-/Luftwärmetauscher nach einem der vorangegan­ genen Ansprüche, dadurch gekennzeichnet, daß die Rohre zum auslaß­ seitigen Wasserkasten hin geneigt verlaufen.6. Steam / air heat exchanger according to one of the preceding claims, characterized in that the pipes to the outlet side water box inclined. 7. Dampf-/Luftwärmetauscher nach einem der vorangegan­ genen Ansprüche, dadurch gekennzeichnet, daß die Rohre als stehende Ovalrohre ausgebildet sind.7. Steam / air heat exchanger according to one of the preceding claims, characterized in that the tubes as standing Oval tubes are formed.
DE19934325171 1993-07-27 1993-07-27 Air-vapour (air-steam) heat exchanger Withdrawn DE4325171A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934325171 DE4325171A1 (en) 1993-07-27 1993-07-27 Air-vapour (air-steam) heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934325171 DE4325171A1 (en) 1993-07-27 1993-07-27 Air-vapour (air-steam) heat exchanger

Publications (1)

Publication Number Publication Date
DE4325171A1 true DE4325171A1 (en) 1995-02-02

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ID=6493829

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19934325171 Withdrawn DE4325171A1 (en) 1993-07-27 1993-07-27 Air-vapour (air-steam) heat exchanger

Country Status (1)

Country Link
DE (1) DE4325171A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009016650A1 (en) * 2007-08-02 2009-02-05 Spray Engineering Devices Limited Improved falling film heat exchanger

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE446592C (en) * 1924-10-26 1927-07-05 Erich Freundlich Dipl Ing Trickle condenser for refrigeration machines
US1748121A (en) * 1928-01-24 1930-02-25 Norman H Gay Condenser for refrigerating plants
DE1733991U (en) * 1956-09-15 1956-11-15 Daimler Benz Ag LIQUID COOLERS OF COMBUSTION MACHINERY.
DE2033960A1 (en) * 1970-07-08 1972-01-20 Teledyne Industries, Ine , Los Ange les,Cahf (VStA) Multi-stage stratified steam cooling system with closed circuit for internal combustion engines
DE3424470C2 (en) * 1983-07-11 1987-02-05 Nissan Motor Co., Ltd., Yokohama, Kanagawa Internal combustion engine
DE4119172A1 (en) * 1990-06-21 1992-01-02 Volkswagen Ag Evaporating cooling system for IC engines - uses pressure and weight ratios to determine flow through condenser and by=pass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE446592C (en) * 1924-10-26 1927-07-05 Erich Freundlich Dipl Ing Trickle condenser for refrigeration machines
US1748121A (en) * 1928-01-24 1930-02-25 Norman H Gay Condenser for refrigerating plants
DE1733991U (en) * 1956-09-15 1956-11-15 Daimler Benz Ag LIQUID COOLERS OF COMBUSTION MACHINERY.
DE2033960A1 (en) * 1970-07-08 1972-01-20 Teledyne Industries, Ine , Los Ange les,Cahf (VStA) Multi-stage stratified steam cooling system with closed circuit for internal combustion engines
DE3424470C2 (en) * 1983-07-11 1987-02-05 Nissan Motor Co., Ltd., Yokohama, Kanagawa Internal combustion engine
DE4119172A1 (en) * 1990-06-21 1992-01-02 Volkswagen Ag Evaporating cooling system for IC engines - uses pressure and weight ratios to determine flow through condenser and by=pass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009016650A1 (en) * 2007-08-02 2009-02-05 Spray Engineering Devices Limited Improved falling film heat exchanger

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Legal Events

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8139 Disposal/non-payment of the annual fee