DE745680C - Metal heat exchanger operated with gaseous substances - Google Patents

Metal heat exchanger operated with gaseous substances

Info

Publication number
DE745680C
DE745680C DET41166D DET0041166D DE745680C DE 745680 C DE745680 C DE 745680C DE T41166 D DET41166 D DE T41166D DE T0041166 D DET0041166 D DE T0041166D DE 745680 C DE745680 C DE 745680C
Authority
DE
Germany
Prior art keywords
heat exchanger
gaseous substances
metal heat
exchanger operated
operated
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
Application number
DET41166D
Other languages
German (de)
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.)
HERMANN CARL AMME
Original Assignee
HERMANN CARL AMME
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 HERMANN CARL AMME filed Critical HERMANN CARL AMME
Application granted granted Critical
Publication of DE745680C publication Critical patent/DE745680C/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Air Supply (AREA)

Description

Mit gasförmigen Stoffen betriebener metallener -Wärmeaustauscher Den Gegenstand der Erfindung bilden mit gasförmigen Stoffen betriebene metallene Wärmeaustauscher, insbesondere Lufterhitzer für industrielle Feuerungen, Trocknungsanlagen u..dgl., bei dem die mit Vorsprüngen versehenen Trennwände Kanäle bilden, zwischen denen di°e Strömung der Gase geführt wird.Metallic heat exchanger Den operated with gaseous substances The invention relates to metal heat exchangers operated with gaseous substances, in particular air heaters for industrial furnaces, drying systems, etc., in which the projecting partitions form channels between which the flow of the gases is guided.

Der Erfindung liegt nun die Erkenntnis zugrunde, daß bei Einhaltung bestimmter zahlenmäßig festliegender Grenzen für die Bemessung der Länge der in Strömungsrichtung hintereinander angeordneten Rippenstücke sowie der Weite der zwischen ihnen verbleibenden Lücken mit Sicherheit eine wesentliche Steigerung der Wärmeübergangsleistung erzielt wird, die bis zu einem Mehrfachen derjenigen Wärme'übergangsleistung geht, die sich be der bekannten Anordnung durchlaufender Langrippen, mit welchen die an ihnen entlang fließenden Gase ohne Unterbrechung in Berührung bleiben, erreichen läßt.The invention is based on the knowledge that when adhered to certain numerical limits for the dimensioning of the length of the in Flow direction one behind the other arranged rib pieces and the width of the between any remaining gaps with them will certainly result in a substantial increase in the heat transfer capacity is achieved that goes up to a multiple of that heat transfer rate, which be the known arrangement of continuous long ribs with which the to stay in contact with them along flowing gases without interruption leaves.

Es wurde nun gefunden, daß dies der Fall ist, wenn man die Länge der Rippenstücke, in Strömungsrichtunggemessen,höchstens 40 mm, noch besser kürzer als 20 mm macht, `nährend die rippenartigen Vorsprünge mit einem lichten Abstand, in Strömungsrichtung gemessen, von höchstens qo mm, mindestens aber von 3 mm angeordnet werden. Bleibt dabei die Geschw.indigkeit der strömenden Gase unterhalt 15 miSek., so erhält man in jedem Fall eine erheblichgesteigerteWärmeübergangsleistung.It has now been found that this is the case if the length of the rib pieces, measured in the direction of flow, is made at most 40 mm, even better shorter than 20 mm , while the rib-like projections are spaced apart, measured in the direction of flow, of at most qo mm, but at least 3 mm. If the speed of the flowing gases remains less than 15 msec., A considerably increased heat transfer rate is obtained in any case.

Die Erklärung für diese erhebliche Steigerung der Wärmeübergangsleistung ergibt sich daraus, daß infolge des Wechsels zwischen Berührungszeit und Unterbrechungszeit die Grenzschicht im strömenden Gase jeweils nur eine sehr geringe Stärke annimmt, da sie bei jeder Unterbrechung .beseitigt wird und bei neuer Berührung sich neu bilden muß. Je geringer aber jeweils die Stärke der Grenzschicht ist, desto besser ist die Wärmedurchgangsleistung auf der betreffenden Seite der Trennwand. In jedem Fall hat es sich gezeigt, daß in dem oben angegebenen Geschwindigkeitsbereich die Bemessung der Länge der Rippen mit weniger als q.o mm, in Strömungsrichtung gemessen, sowie der Weite der Lükken unterhalb derselben Grenze von besonderer technischer Bedeutung insofern ist, als hei The explanation for this considerable increase in heat transfer capacity results from the fact that, due to the change between contact time and interruption time, the boundary layer in the flowing gas only assumes a very small thickness, since it is eliminated with each interruption and must be formed again with new contact. However, the lower the thickness of the boundary layer, the better the heat transfer performance on the relevant side of the partition. In any case, it has been shown that in the speed range given above, the dimensioning of the length of the ribs with less than qo mm, measured in the direction of flow, as well as the width of the gaps below the same limit is of particular technical importance insofar as hot

Claims (1)

PATENTANSPRUCH:
PATENT CLAIM:
DET41166D 1931-11-04 1932-08-03 Metal heat exchanger operated with gaseous substances Expired DE745680C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS745680X 1931-11-04

Publications (1)

Publication Number Publication Date
DE745680C true DE745680C (en) 1944-03-16

Family

ID=5455312

Family Applications (1)

Application Number Title Priority Date Filing Date
DET41166D Expired DE745680C (en) 1931-11-04 1932-08-03 Metal heat exchanger operated with gaseous substances

Country Status (1)

Country Link
DE (1) DE745680C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898345C (en) * 1949-04-14 1953-11-30 Heinrich Dipl-Ing Truelsen Recuperator for smaller industrial furnaces
DE975075C (en) * 1951-07-22 1961-08-03 Gerhard Dipl-Ing Goebel Heat exchanger
DE2158505A1 (en) * 1970-11-27 1972-05-31 Mulock Bentley & Ass Heat exchanger unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898345C (en) * 1949-04-14 1953-11-30 Heinrich Dipl-Ing Truelsen Recuperator for smaller industrial furnaces
DE975075C (en) * 1951-07-22 1961-08-03 Gerhard Dipl-Ing Goebel Heat exchanger
DE2158505A1 (en) * 1970-11-27 1972-05-31 Mulock Bentley & Ass Heat exchanger unit

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