EP0994313B1 - Verfahren zur Herstellung eines Wärmetauschers und Wärmetauscher, der durch Anwendung des Verfahrens erhalten wird - Google Patents
Verfahren zur Herstellung eines Wärmetauschers und Wärmetauscher, der durch Anwendung des Verfahrens erhalten wird Download PDFInfo
- Publication number
- EP0994313B1 EP0994313B1 EP19990203247 EP99203247A EP0994313B1 EP 0994313 B1 EP0994313 B1 EP 0994313B1 EP 19990203247 EP19990203247 EP 19990203247 EP 99203247 A EP99203247 A EP 99203247A EP 0994313 B1 EP0994313 B1 EP 0994313B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- channel
- chamber
- heat
- fluid
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- 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
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
Definitions
- the invention relates to a method for producing a Heat exchanger made of metal such as aluminum, copper, iron, Steel or brass, which comprises heat exchanger: one by a wall formed space, which with a Inlet opening for supplying a first fluid into the room, and an outlet port for discharging the first fluid the room is provided; essentially one helically around the room extending channel for one second fluid; and a number of projections made by the Wall into the room protrude.
- the concerns Invention a obtained by application of the method Heat exchanger.
- Such a heat exchanger is for example from EP-A-0 794 393.
- This publication describes one with the help of a casting technique of light metal manufactured heat exchanger with a closed, polygonal or curved interior wall, with at least a water channel, one inside the inner wall extending combustion chamber for hot flue gases and at the Inner side extending from the inner wall heat transferring surface enlarging elements, such as Cam or partition walls is provided.
- the water channel extends helically along the outside of the Inner wall and has adjacent turns.
- the known heat exchanger is relatively compact.
- the known heat exchanger has a cheap Efficiency due to the fact that the water channel the outside of the combustion chamber is mounted.
- the known heat exchanger is in a conventional Casting using a G confusekerngemosges from Sand, wax or plastic poured.
- Such Casting processes create, in principle, those for the design the heat exchanger desired freedom in the determination the relationship between the waterside and flue gas side surface for optimum heat transfer between the flue gases and the water.
- a disadvantage of the known heat exchanger is that the Content of the water channel is relatively large, with the result has that after the commissioning of the heat exchanger due to the high heat capacity of the water takes a relatively long time to water in the water channel has the desired temperature. This is above all undesirable if the water in the heat exchanger part of a Water cycle for heating tap water is what is in a so-called combi boiler, which is destined to both To heat tap water as well as water for heating purposes, is common.
- the desired Zapfwassererhitzung finds only instead, when the water flowing through the heat exchanger has reached the right temperature. The faster this happens, the higher the comfort for the user of the Be boiler.
- a first reason for the great content of the water channel in the well-known Wämreleyer is that the water channel a must have relatively large minimum cross section to this Shape the canal using a traditional casting process to be able to. These minimum dimensions must not fall below because of the casting core in this case at least during the casting process an insufficient Support on the walls of the canal could provide. Both in connection with and independently of The first reason mentioned is a second reason for the big one Content of the water channel that the water channel is almost extends over the entire outer surface of the combustion chamber, so that the water channel has a relatively large length.
- Another disadvantage of the known heat exchanger is that this one, though light alloy is used one more has relatively large mass, as the different parts like e.g. the wall of the combustion chamber, the wall of the water channel and the elements that make up the heat-transferring surface enlarge, are relatively thick.
- the reason for this thickness is the required minimum space between the parts of the G confusekernsatzes in connection with inaccuracies in the Production of G confusekernsatzes, the assembly and its Use.
- the relatively large mass of Heat exchanger implies that the heat capacity of the Heat exchanger is relatively large and that the material costs are relatively high. The adverse consequences of the big ones Heat capacity are above in connection with the Water channel has been explained.
- the object of the invention is therefore to provide a method create a heat exchanger in such a way that the limitations of the traditional Manufacturing process are overcome and the cheap Characteristics of the known type of heat exchanger on can be optimized.
- the Method comprises the following steps: a plastic becomes a copy of the heat exchanger made, which plastic at least in the Melting temperature of the metal evaporates; the surfaces of the copy are with a gas permeable, supporting layer of one heat-resistant material coated; and Metal in the liquid state on the copy inside the gas permeable layer is poured to the plastic to evaporate and the space occupied by the plastic to fill with the metal.
- the plastic heat exchanger preferably made of polystyrene (EPS)
- injection molding can be resorted to, with whose help is the copy of one piece or several parts can be made.
- the production in parts becomes one choose if the geometry of the heat exchanger and thus even the copy is complex.
- the for molding the copy parts required shape (s) can be relative in this case easy to run.
- the different parts of the Copy can be easily made with one after its manufacture suitable adhesive or by e.g. Welding the Plastic bonded together to form the copy become.
- the plastic and any applied adhesive should have an evaporation temperature that is lower than or at least as high as that Melting temperature of the metal from which the heat exchanger is prepared so that during the casting of the liquid Metal on the copy of the space defined by the copy is gradually occupied by the metal, while the Plastic and possibly the adhesive evaporate and through the gas-permeable, supporting layer heat-resistant material escape.
- a Plastic copy fulfills this task is, first, a greater freedom of design possible in the other Construction elements such as sound insulating devices, the contain one or more cavities, as integral Part of the heat exchanger can be provided. Further, details of the heat exchanger, such as e.g. walls and protrusions, made with a smaller thickness be what the heat capacity of the heat exchanger significantly reduced and improved heat transfer.
- the cross section of the water channel can be reduced, so that the content of the channel and so the heat capacity of the Water decreases significantly, allowing a quick heating the water can take place.
- the surfaces of the copy coated by first the Surfaces of the copy with a gas-permeable layer a first heat-resistant material coated and then the gas-permeable layer with a layer from a supporting, porous second heat-resistant Coated material.
- the gas permeable layer of the first heat-resistant material preferably one ceramic material, in particular silicon dioxide, Alumina earth, zircon, chromite and / or aluminosilicate, acts as a "skeleton" for the copy to receive their Form before and during the casting process and act as well as a "separation wall" between the copy (and during the Casting process: the metal) and the layer of the supporting, porous second heat-resistant Material, which is preferably a ceramic material, and in particular consists of sand.
- the layer from the first heat-resistant material can dip through pour over or spray on, and is preferably thin, e.g. 0.25 to 1.5 mm thick to the Gas produced during the casting process will easily pass through allow.
- the layer can also be thin, because the second heat-resistant material for the necessary support the layer of the first heat-resistant material ensures especially if there is liquid metal underneath.
- the layer of the second heat-resistant material is usually thicker than the layer from the first heat resistant material and can be easily formed by Be first by the cavities of the first heat resistant material provided copy with sand fills and then the copy e.g. put in a box with sand, like that that the whole outside of the copy except the necessary pouring holes is sufficiently covered with sand. If a consolidation of the sand is necessary, he will shaken for a certain time. The sand becomes preferably no binder added.
- the sand can after the casting process and the solidification of the metal easily be discharged, with the sand, if necessary, through shake off the cavities of the copy can be removed.
- the sand is hardly contaminated and can without problems reused or disposed of without special measures become.
- the sand itself known means add to the dimensional stability of the sand mass especially during the casting process, so that also on attaching the layer from the first heat-resistant material to be dispensed with the copy can.
- the object of the invention is in particular, a Heat exchangers with a relatively low heat capacity, a relatively small amount of water, an excellent one Heat transfer, a low weight and a to create low price.
- a Heat exchanger prepared according to the method described above.
- the heat exchanger according to the invention carried out such that the heat exchanger has an integrated Exhaust passage for the first fluid containing a Inlet opening and an outlet opening, wherein the Inlet opening of the inlet channel to the outlet opening of the room. That way, a connection can be made with the necessary seal between the room and the Outlet channel can be saved, and can Combustion system, of which the heat exchanger is a part makes, especially compact to be built.
- the channel extends for the second Fluid in the amount of heat conduction elements also around the Outlet channel to the heat that in the exhaust duct the first fluid is withdrawn as effectively as possible to the to transfer second fluid.
- the through the space and the outlet channel certain flow path for the first fluid U-shaped. It would be advantageous if the inlet is in the same Level as the outlet opening of the outlet channel are would. This allows the belonging to the heat exchanger Components of a combustion system such as a burner, a Rauchgasauslwiekanal u.ä. easy and as compact units are mounted on the heat exchanger.
- the inlet of the room and the Outlet of the outlet channel through a common flange educated. After pouring the heat exchanger needs in in this case only one flange surface reworked become what takes place in a single machining operation can. Any dimensional deviations of the casting have no or hardly influence on the connections to the mentioned Inlet and outlet. If on the flange too mounting components (in the case of a Combustion device: a burner and a Flue gas outlet) before assembly into a composite Components have been assembled, this can be assembled component in one operation become. Disassembly of a composite component leads to a simplification of maintenance and cleaning of the heat exchanger.
- the heat exchanger is designed such that the space cross-section, transverse to the flow direction of the first Fluid considered, in the flow direction of the first Fluids decreases. So one achieves that the Flow velocity of, in its flow direction cooling by heat transfer to the second fluid first fluid always stays high enough to get a good one To ensure heat transfer.
- the turns of the channel positioned at a certain distance from each other. Thanks this measure is the volume of fluid in the channel, usually water, small. The fluid can therefore be fast to be warmed up.
- the heat exchanger is designed such that on at least a part of the wall of the room, the projections missing, with this wall part with itself, across the Viewing the flow direction of the first fluid in space, extending, protruding into the room vaulting is provided.
- the heat exchanger According to the invention one or more of the channel wall from protruding into the channel projections.
- the Projections in the space for the first fluid the Projections in the channel in many different ways be formed (in general such that a Turbulence of the second fluid is generated or increased), for example, as a pin or ribs.
- bulges create turbulence in the flow of first fluids and lead to an enlargement of the Heat exchanger surface, which is in contact with the first fluid comes. Both effects lead to an improvement of the Heat transfer from the first fluid to the room wall.
- at the level of the bulges are parts of the Channels, so that also the heat transfer of the first Fluid is improved to the second fluid.
- Figures 1 to 3 show a copy housing part 2, a Copy housing part 4, a copy housing part 6 and a Copy Channel Part 8.
- the Copy Enclosure Parts 2 and 4 are included each side walls 10, 12 and 14, a bottom wall 16 and an inner wall 18.
- the sidewalls 10 a part 12a of each of the side walls 12, a part 16a from each of the bottom walls 16, and the inner walls 18 a Heat exchange chamber whose cross section from top to bottom considered decreasing.
- the side walls 14, a part 12b of each of the side walls 12, a part 16b of each of the Floor walls 16, and the inner walls limit one Outlet channel.
- the side walls 10, 12 and 14 and the Inner wall 18 of each copy housing part ends at one common edge in the flange 20.
- the flanges 20 ( Figure 2) in turn limit a large opening, inlet opening 22 called the heat exchange space, and a small opening, Outlet opening 24 of the outlet channel called. This is how it is the inlet opening 22 in the same plane as the Outlet opening 24.
- the heat exchange room has a Outlet opening, which with the inlet opening of the Outlet channel coincides and from the passage between the bottom walls 16 and the inner walls 18 is formed. In this shaping is corresponding in one of the copy Heat exchanger of the room and the outlet certain flow path for the first fluid U-shaped.
- each side wall 12 which is the other Copy housing part 4 faces, is in the Heat exchange chamber a large number of pins 26 in one appropriate pattern attached.
- the pins 26 have in the Figures 1 and 3 a circular cross section; you can but also another form, such as a have oval or rectangular cross-section. Next you can the pins 26 viewed over their length different Have cross sections, for example, larger at their foot ends as being at their free ends.
- the pins 26 can also by ribs or similar be replaced.
- ribs or similar is always that (in one of the copy corresponding Heat exchanger) a flowing past it no fluid straight line from the inlet opening of the room to Outlet opening of the room may be allowed to travel because so that the heat transfer, via the cones, the ribs etc. takes place, demolition would be done.
- the pin 27 or similar can at the Copy channel parts 6 or 8 ( Figure 4) or to the Copy housing parts 2 or 4 ( Figure 1) or both types be attached by parts.
- the copy case parts 2 and 4 and the copy channel parts 6 and 8 are all designed so that they with the help of a relatively simple form of a plastic material without the need to be at a certain angle to Release direction of the mold to use moving moldings to must be able to be manufactured. If the parts 2 to 8 are formed, they become a complete copy of the assembled to heat exchanger to be manufactured, as shown in FIG 2 is shown. For this, the parts 2 to 8 are preferably glued together with a suitable adhesive. in the With regard to the pin 26 is here noted that this one Such length and position can have that after the Assembly of parts 2 and 4 a bridge between the respective side walls 12 of the parts 2 and 4 form.
- the Journal sets 26 of different parts 2 and 4 can also be positioned offset from each other and to protrude between each other. Another possibility is, in that the pins 26 of the part 2 and the pins of the part 4 probably aligned, but the ends of the pins are not touching each other. In the latter case, the pins of each part 2, 4 different lengths from each other have to prevent (in one of the copy corresponding heat exchanger) a part of the by the Heat exchanger of flowing fluid on a direct path from the inflow opening can flow to the outlet opening.
- a second fluid flows in countercurrent as e.g. Water through the channel 28 from the inlet port 30 to the outlet opening 32, said second fluid from the absorbs heat emitted by the first fluid.
- a second fluid flows in countercurrent as e.g. Water through the channel 28 from the inlet port 30 to the outlet opening 32, said second fluid from the absorbs heat emitted by the first fluid.
- the Heat exchange resulting corrosion products and condensate can the heat exchanger via an outlet opening 34 (FIG 2) leave.
- Figures 4 and 5 show an embodiment of the copy a heat exchanger according to the invention, which in wide Areas in a manner similar to the copy of FIG. 1 to 3 is formed.
- a point of difference concerns the design of the projections 26 a, which a have rectangular cross-section.
- the parts of the Channels 28 which extend on the side wall 10, completely on the heat exchange chamber side facing attached to the side wall 10, resulting in a planar shape the copy outside leads.
- the inner wall 18 partially made twice to (in a the copy corresponding to the heat exchanger) the warmest part the heat exchange chamber located directly at the inlet port 22 connects, as far as possible in thermal terms from the coldest part of the exhaust duct, which is the Outlet opening 24 directly precedes to separate.
- Part of the Outlet channel contains, as well as the heat exchange space, Protrusions 26b.
- the channel 28 extends helically around the heat exchange space and at the level of the protrusions 26b as well around the outlet channel.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
- Figur 1
- in perspektivischer Darstellung eine erste Ausführungsform einer Kopie des Wärmetauschers gemäß der Erfindung, in auseinander genommener Form
- Figur 2
- in perspektivischer Darstellung die Kopie aus Figur 1 in zusammengesetzter Form,
- Figur 3
- einen Teil der Kopie in Figur 1 in einer Seitenansicht gemäß dem Pfeil III in Figur 1,
- Figur 4
- in perspektivischer Darstellung eine zweite Ausführungsform der Kopie aus auseinander genommener Form eines Wärmetauschers gemäß der Erfindung und
- Figur 5
- in perspektivischer Darstellung die Kopie in Figur 4 in zusammengesetzer Form.
Claims (16)
- Verfahren zur Herstellung eines Wärmetauschers aus Metall, welcher Wärmetauscher umfaßt:einen von einer Wand gebildeten Raum, der mit einer Einlaßöffnung (22) zum Zuführen eines ersten Fluids in den Raum und einer Auslaßöffnung zum Abführen des ersten Fluids aus dem Raum versehen ist;einen sich im wesentlichen schraubenförmig um den Raum erstreckenden Kanal (28) für ein zweites Fluid; undeine Anzahl von Vorsprüngen (26), die von der Wand in den Raum ragen,wobei das Verfahren gekennzeichnet ist durch die Schritte, daßa) aus einem Kunststoff eine Kopie des Wärmetauschers hergestellt wird, welcher Kunststoff wenigstens bei der Schmelztemperatur des Metalls verdampft;b) die Oberflächen der Kopie mit einer gasdurchlässigen, unterstützenden Schicht aus einem hitzebeständigen Material beschichtet werden; undc) Metall in flüssigem Zustand auf die Kopie innerhalb der gasdurchlässigen Schicht gegossen wird, um den Kunststoff zu verdampfen und den von dem Kunststoff eingenommenen Raum mit dem Metall auszufüllen.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Schritt b) die Schritte umfaßt, daßb1) die Oberflächen der Kopie mit einer gasdurchlässigen Schicht aus einem ersten hitzebeständigen Material beschichtet werden; undb2) die gasdurchlässige Schicht mit einer Schicht aus einem unterstützenden, porösen zweiten hitzebeständigen Material beschichtet wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kunststoff Polystyrol (EPS) ist.
- Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das erste hitzebeständige Material keramisches Material enthält, insbesondere Siliziumoxid, Alaunerde, Zirkon, Chromit und/ oder Aluminosilikat.
- Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß das zweite hitzeständige Material keramisches Material, insbesondere Sand, enthält.
- Wärmetauscher, hergestellt nach dem Verfahren gemäß einer der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß dieser einen integrierten Auslaßkanal für das erste Fluid umfaßt, welcher Kanal eine Einlaßöffnung und eine Auslaßöffnung (24) hat, wobei sich die Einlaßöffnung des Auslaßkanals an die Auslaßöffnung des Raumes anschließt.
- Wärmetauscher nach Anspruch 6, dadurch gekennzeichnet, daß in dem Auslaßkanal nahe von dessen Einlaßöffnung Wärmeleitungselemente (26b) angebracht sind.
- Wärmetauscher nach Anspruch 7, dadurch gekennzeichnet, daß sich der Kanal (28) für das zweite Fluid in Höhe der Wärmeleitungselemente (26b) unter anderem um den Auslaßkanal erstreckt.
- Wärmetauscher nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß der von dem Raum und dem Auslaßkanal bestimmte Strömungsweg für das erste Fluid U-förmig ist.
- Wärmetauscher nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß sich die Einlaßöffnung (22) des Raumes in der gleichen Ebene wie die Auslaßöffnung (24) des Auslaßkanals befindet.
- Wärmetauscher nach Anspruch 10, dadurch gekennzeichnet, daß die Einlaßöffnung (22) des Raumes und die Auslaßöffnung (24) des Auslaßkanals von einem einzigen gemeinsamen Flansch gebildet werden.
- Wärmetauscher nach einem der Ansprüche 6 bis 11, dadurch gekennzeichnet, daß der Querschnitt des Raumes, quer zur Strömungsrichtung des darin enthaltenen Fluids betrachtet, in Strömungsrichtung des ersten Fluids abnimmt.
- Wärmetauscher nach einem der Ansprüche 6 bis 12, dadurch gekennzeichnet, daß die Windungen des Kanals (28) zueinander beabstandet sind.
- Wärmetauscher nach einer der Ansprüche 6 bis 13, dadurch gekennzeichnet, daß an wenigstens einem Teil der Raumwand die Vorsprünge fehlen, wobei der Wandteil mit sich quer zur Strömungsrichtung des ersten Fluids im Raum betrachtet erstreckenden, in den Raum ragenden Wölbungen versehen ist.
- Wärmetauscher nach einem der Ansprüche 13 und 14, dadurch gekennzeichnet, daß sich in Höhe der Wölbungen Teile des Kanals befinden.
- Wärmetauscher nach einem der Ansprüche 6 bis 15, dadurch gekennzeichnet, daß einer oder mehrere Vorsprünge von der Kanalwand aus in den Kanal hinein ragen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1010300A NL1010300C2 (nl) | 1998-10-12 | 1998-10-12 | Werkwijze voor het vervaardigen van een warmtewisselaar, en warmtewisselaar verkregen door toepassing van genoemde werkwijze. |
NL1010300 | 1998-10-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0994313A1 EP0994313A1 (de) | 2000-04-19 |
EP0994313B1 true EP0994313B1 (de) | 2005-03-02 |
Family
ID=19767955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990203247 Expired - Lifetime EP0994313B1 (de) | 1998-10-12 | 1999-10-04 | Verfahren zur Herstellung eines Wärmetauschers und Wärmetauscher, der durch Anwendung des Verfahrens erhalten wird |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0994313B1 (de) |
NL (1) | NL1010300C2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1938917A1 (de) * | 2006-12-22 | 2008-07-02 | UNICAL AG S.p.A. | Mittels Guss hergestelltes Wärmetauscherelement und Verfahren zur Herstellung von Polystyrolstrukturen für den Guss |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1933101A3 (de) * | 2006-12-08 | 2012-09-05 | Vaillant GmbH | Wärmetauscher mit Brennkammer |
CN101786153A (zh) * | 2010-03-29 | 2010-07-28 | 王增武 | 成组柱型散热器的铸造工艺 |
ITMN20110005A1 (it) * | 2011-03-03 | 2012-09-04 | Cubo D S R L | Scambiatore di calore con percorso dell'acqua misto per caldaie da riscaldamento. |
ITMN20110007A1 (it) * | 2011-03-03 | 2012-09-04 | Cubo D S R L | Scambiatore di calore con percorso dell'acqua a spirale per caldaie da riscaldamento. |
ITMN20110006A1 (it) * | 2011-03-03 | 2012-09-04 | Cubo D S R L | Scambiatore di calore con percorso dell'acqua in parallelo per caldaie da riscaldamento. |
WO2012117432A1 (en) * | 2011-03-03 | 2012-09-07 | Cubo D S.R.L. | Heat exchanger for heating boilers |
CN104057029A (zh) * | 2014-07-03 | 2014-09-24 | 宁德东升宏宇科技有限公司 | 高炉风口的制造方法 |
TR201808668T4 (tr) * | 2015-11-25 | 2018-07-23 | Daikin Europe Nv | Isı eşanjörü. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2134805A1 (en) * | 1993-11-29 | 1995-05-30 | Furgan Z. Shaikh | Rapidly making complex castings |
NL1002562C2 (nl) | 1996-03-08 | 1997-09-09 | Holding J H Deckers N V | Gegoten, lichtmetalen, veelhoekige warmtewisselaar met spiraalvormig waterkanaal. |
-
1998
- 1998-10-12 NL NL1010300A patent/NL1010300C2/nl not_active IP Right Cessation
-
1999
- 1999-10-04 EP EP19990203247 patent/EP0994313B1/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1938917A1 (de) * | 2006-12-22 | 2008-07-02 | UNICAL AG S.p.A. | Mittels Guss hergestelltes Wärmetauscherelement und Verfahren zur Herstellung von Polystyrolstrukturen für den Guss |
Also Published As
Publication number | Publication date |
---|---|
EP0994313A1 (de) | 2000-04-19 |
NL1010300C2 (nl) | 2000-04-13 |
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