EP0553238A1 - Spiral heat exchanger. - Google Patents
Spiral heat exchanger.Info
- Publication number
- EP0553238A1 EP0553238A1 EP91919518A EP91919518A EP0553238A1 EP 0553238 A1 EP0553238 A1 EP 0553238A1 EP 91919518 A EP91919518 A EP 91919518A EP 91919518 A EP91919518 A EP 91919518A EP 0553238 A1 EP0553238 A1 EP 0553238A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spiral
- channels
- channel
- heat exchanger
- 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.)
- Granted
Links
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
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
- F28D7/022—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
Definitions
- the invention relates to a spiral heat exchanger provided with a cylindrical, casing, inside which a first medium can flow through, and a channel which runs as a spiral around the cylinder axis and through which a second medium can flow.
- a spiral heat exchanger of this type is disclosed in Offenlegungsschrift DE-3519315 Al.
- a channel in spiral form through which a second medium flows is provided inside the cylindrical casing through which a first medium flows.
- This heat exchanger is usually used in a central heating circuit in which the exhaust gases flow out of the heating boiler through the casing and in part release heat to the return water flowing through the spiral channel, which yields a saving in fuel consumption.
- the spiral channel is double- wound so that inlet and outlet are on one side of the cylindrical casing. A problem with this heat exchanger is the relatively moderate heat transfer.
- heat exchangers of compact size have now been found to be of great importance, on the one hand in connection with the lack of space under certain process conditions and, on the other hand, in connection with the advantageous specific power (kW/m 3 ) of such a heat exchanger for a specific temperature difference between the media and the low specific cost price per square meter of heat-exchanging surface which is possible as a consequence.
- kW/m 3 the advantageous specific power of such a heat exchanger for a specific temperature difference between the media and the low specific cost price per square meter of heat-exchanging surface which is possible as a consequence.
- applications have emerged for which it was found necessary to have a heat exchanger of small dimensions in which several media flows can exchange heat with one another.
- the aim of the invention is to overcome the above-mentioned problems and to provide a compact heat exchanger in which the heat transfer is particularly high and with which, as a consequence of the dimensions, a modular construction of a plurality of these heat exchangers is simple to achieve.
- the invention also relates to a matrix-type heat exchanger built up from modules, each of which are formed by a heat exchanger as mentioned above.
- Fig. 1 gives a partially perspective and partially cross-sectional view of the heat exchanger according to the invention
- Fig. 2 gives a graph of the influence of the spiral diameter and the water speed on the heat transfer coefficient
- Fig. 3 gives a graph of the medium temperature in the channels as a function of the spiral length.
- Figure 1 gives a view of the compact exchanger 3 according to the invention with two spiral channels or pipes 1, 2, each of which alternately is wound directly around the straight cylindrical channel 4.
- the cylindrical casing of the heat exchanger 6 can be made of insulating material.
- each spiral pipe has sixteen windings around the straight pipe, as a result of which the total heat exchanger has a length of about 235 *•*••*-•
- the heat exchanger according to the invention can advantageously be produced, for example, by winding two annealed red copper pipes, filled with sand, with a guide around a steel pin to form an assembly.
- Each copper pipe for example, has an inner(di)- and outer(du) diameter of 4.6 mm and 6.35 mm respectively. After removal of the pin, a straight red copper pipe having the same external diameter is inserted in the same place. The entire assembly is then immersed in liquid tin or another liquid materials aving good thermal conductivity.
- the tin is subsequently melted again using a burner flame.
- any hollow cavities still present between the three pipes are completely filled by the liquid metal flowing in until full.
- polyethylene can be applied as pipe insulation 6 around the entire assembly.
- the thickness of the tin layer between the various respective channels is a minimum of 1 mm at the locations where the copper channel walls are closest to one another; the tin melted between the channels has at all locations a 100.5! contact with the wall surfaces of the spirals and the straight channel; a value of 349 W/m.K is taken for the thermal conductivity coefficient of copper and a value of 65 W/m.K for that of tin; the arithmetic average value between the measured inlet and outlet temperatures of the two heat-exchanging media is taken for the temperature in the middle of the 1-mm thick tin layer (see also
- the heat flow density through the channel walls was calculated with the aid of the transferred power, which follows from the heat balance and the internal surface area of the various channels.
- a calculation example is given below, while all calculated heat transfer coefficients for the media water/water (2130 to 22624 W/m 2 .K) are given in Table 1.
- Table 1 shows the measurement results for the media water/water and Table 2 the measurement results for the media air/nitrogen vapour. The trials were carried out in order to gain an impression of how the heat exchanger behaves, both with liquid media and with gaseous media. The results were, as stated above, excellent.
- Pr Prandtl number for the relevant medium
- Prw Prandtl number for the relevant medium at the wall temperature prevailing there. Applied to Experiment No. 1, this gives the following:
- the thermal resistances can also show local differences as a consequence thereof.
- the thermal resistance ⁇ / ⁇ of the total material thickness (copper + tin) was also calculated. This ⁇ / ⁇ was 20.4.10 "6 m 2 .K/W.
- T2 average partition (tin layer) temperature of the hot medium (°C);
- C. J the heat transfer coefficient (W/m 2 .K) calculated above;
- ⁇ cu and ⁇ sn are the coefficients of thermal conductivity of copper and tin respectively at the prevailing temperatures (in W/m.K) and Di, Dl and D2 are the respective diameters associated with the above-mentioned symbols (in m) .
- a number of these heat exchangers can advantageously be assembled in modular construction to form a larger matrix-type heat exchange unit.
- a matrix-type heat exchange unit of this type a number of modules, each of which comprises a heat exchanger according to the invention, are joined to one another in rows and/or columns and connected to one another.
- a heat exchange unit of this type can be produced, for example, by winding lead wires in a block of ceramic powder in accordance with the said channels of a single heat exchanger according to the invention. The said block of ceramic powder is subsequently baked, the lead wires melting away in each module. After cooling, the said three or more channels remain in the ceramic material in each module of the exchange unit.
- a heat exchange unit of this type can advantageously be used for applications using flow-through media for elevated temperatures, for example above 1000 ⁇ C.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9002251A NL9002251A (en) | 1990-10-16 | 1990-10-16 | SPIRAL HEAT EXCHANGER. |
NL9002251 | 1990-10-16 | ||
PCT/NL1991/000205 WO1992007226A1 (en) | 1990-10-16 | 1991-10-16 | Spiral heat exchanger |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0553238A1 true EP0553238A1 (en) | 1993-08-04 |
EP0553238B1 EP0553238B1 (en) | 1997-01-22 |
Family
ID=19857833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91919518A Expired - Lifetime EP0553238B1 (en) | 1990-10-16 | 1991-10-16 | Spiral heat exchanger |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0553238B1 (en) |
JP (1) | JP3122464B2 (en) |
AT (1) | ATE148219T1 (en) |
DE (1) | DE69124391T2 (en) |
DK (1) | DK0553238T3 (en) |
NL (1) | NL9002251A (en) |
WO (1) | WO1992007226A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5352784A (en) * | 1993-07-15 | 1994-10-04 | Minnesota Mining And Manufacturing Company | Fused cycloalkylimidazopyridines |
DE69425661T2 (en) * | 1993-07-15 | 2001-04-19 | Minnesota Mining & Mfg | IMIDAZO [4,5-c] PYRIDINE-4-AMINE |
US5648516A (en) * | 1994-07-20 | 1997-07-15 | Minnesota Mining And Manufacturing Company | Fused cycloalkylimidazopyridines |
US5644063A (en) * | 1994-09-08 | 1997-07-01 | Minnesota Mining And Manufacturing Company | Imidazo[4,5-c]pyridin-4-amine intermediates |
EP0867678A1 (en) * | 1997-03-26 | 1998-09-30 | Artur Zachajewicz | Multicoaxial tube heat exchanger |
EP1632277A1 (en) * | 2004-09-03 | 2006-03-08 | Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO | Process and apparatus for carrying out crystallization |
US8721981B2 (en) | 2009-11-30 | 2014-05-13 | General Electric Company | Spiral recuperative heat exchanging system |
DE102010007249A1 (en) | 2010-02-09 | 2011-08-11 | Went, Tilo, 53474 | Heat exchanger, particularly condenser, is provided with double helix-shaped wall that is introduced in cylinder of two separate helical tubes |
EP2404666A1 (en) | 2010-07-09 | 2012-01-11 | Rhodia Opérations | Module for continuous transformation of at least one fluid product, associated unit and method. |
WO2011117540A1 (en) | 2010-03-23 | 2011-09-29 | Rhodia Operations | Module for the continuous conversion of at least one fluid product, and associated unit and method |
CN105277022A (en) * | 2015-11-30 | 2016-01-27 | 李家海 | Tube-tube interlaced type heat exchanger |
WO2017214489A1 (en) * | 2016-06-09 | 2017-12-14 | Fluid Handling Llc | 3d spiral heat exchanger |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE203759C (en) * | 1907-12-24 | 1908-10-29 | ||
SE441302B (en) * | 1980-05-27 | 1985-09-23 | Euroheat Ab | TREATMENT HEAD EXCHANGER WITH SPIRALLY INDEPENDED RODS IN A STACK |
US4316502A (en) * | 1980-11-03 | 1982-02-23 | E-Tech, Inc. | Helically flighted heat exchanger |
FR2549215B1 (en) * | 1983-07-11 | 1988-06-24 | Produits Refractaires | MOLDED HEAT EXCHANGERS IN REFRACTORY MATERIAL |
DE3519315A1 (en) * | 1985-05-30 | 1986-12-04 | kabelmetal electro GmbH, 3000 Hannover | Heat exchanger consisting of a jacket tube and a tube arranged in the interior of the jacket tube and extending in a spiral fashion |
-
1990
- 1990-10-16 NL NL9002251A patent/NL9002251A/en not_active Application Discontinuation
-
1991
- 1991-10-16 EP EP91919518A patent/EP0553238B1/en not_active Expired - Lifetime
- 1991-10-16 JP JP03517462A patent/JP3122464B2/en not_active Expired - Fee Related
- 1991-10-16 WO PCT/NL1991/000205 patent/WO1992007226A1/en active IP Right Grant
- 1991-10-16 DK DK91919518.0T patent/DK0553238T3/en active
- 1991-10-16 DE DE69124391T patent/DE69124391T2/en not_active Expired - Fee Related
- 1991-10-16 AT AT91919518T patent/ATE148219T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9207226A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0553238B1 (en) | 1997-01-22 |
NL9002251A (en) | 1992-05-18 |
WO1992007226A1 (en) | 1992-04-30 |
JPH06502479A (en) | 1994-03-17 |
DE69124391T2 (en) | 1997-08-21 |
JP3122464B2 (en) | 2001-01-09 |
DE69124391D1 (en) | 1997-03-06 |
ATE148219T1 (en) | 1997-02-15 |
DK0553238T3 (en) | 1997-07-07 |
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