IE64546B1 - A heating coil - Google Patents

A heating coil

Info

Publication number
IE64546B1
IE64546B1 IE348490A IE348490A IE64546B1 IE 64546 B1 IE64546 B1 IE 64546B1 IE 348490 A IE348490 A IE 348490A IE 348490 A IE348490 A IE 348490A IE 64546 B1 IE64546 B1 IE 64546B1
Authority
IE
Ireland
Prior art keywords
tube
coil
indentations
heating coil
diameter
Prior art date
Application number
IE348490A
Inventor
Terance Gerard Madigan
David Michael Madigan
Original Assignee
Madigan Terence Gerard
David Michael Madigan
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 Madigan Terence Gerard, David Michael Madigan filed Critical Madigan Terence Gerard
Priority to IE348490A priority Critical patent/IE64546B1/en
Priority to GB9120693A priority patent/GB2249163B/en
Publication of IE64546B1 publication Critical patent/IE64546B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F24D3/082—Hot water storage tanks specially adapted therefor
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Induction Heating (AREA)

Abstract

A tubular heating coil (1) for mounting in a domestic hot water storage cylinder (2) to heat water in the cylinder (2) comprises a helically wound copper tube (5) having a plurality of inwardly directed indentations (6) in a side wall of the tube (5). The indentations (6) create turbulence within heating water delivered through the coil (1) for improved heat transfer to the water stored in the cylinder (2) and are preferably hemi-spherical in form with a diameter in a ratio to the tube diameter between 3:1 and 4:1. The tube may be shaped by passing it between two opposed rollers each with a U-shaped groove with projections to form the indentations.

Description

A Heating Coil This invention relates to heating coils, and in particular to a heating coil for a domestic hot water storage cylinder.
According to the invention there is provided a tubular heating coil for a domestic hot water storage cylinder having a plurality of inwardly directed spaced-apart indentations in a side wall of a tube from which the coil is formed.
In one embodiment of the invention the indentations have a hemispherical shape and the ratio of the diameter of the tube and the diameter of the indentations is between 3:1 and 4:1.
I The invention will be more clearly understood by the following description of an embodiment thereof, given by way of example only, with reference to the accompanying drawings, in which; Fig 1 is a perspective view of a heating coil according to the invention, Fig 2 is a perspective view of a conventional heating coil, Fig 3 is a cross sectional view taken along the line III-III of Fig 1, Fig 4 is a partially sectioned elevationai view of the heating coil mounted in a domestic hot water storage cylinder, in use, Fig 5 is an elevational view of roller apparatus for forming the heating coil, in use, Fig 6 is an end view of the apparatus of Fig 5, and Fig 7 is a detailed view of portion of the apparatus in use.
Referring to the drawings there is illustrated a tubular heating coil according to the invention indicated generally by the reference numeral 1 for a conventional domestic hot water storage cylinder 2. The heating coil 1 comprises a helically wound copper tube 5 having a plurality of inwardly directed spaced-apart indentations 6 in a side wall of the tube 5. Conventional fasteners 8 are mounted at each end of the tube 5 for attachment of the coil 1 to a side wall 10 of the hot water storage cylinder 2.
The indentations 6 have a hemispherical shape and the ratio of the diameter D of the coil 5 (see Fig 3) and the diameter d of the indentations 6 is between 3:1 and 4:1. Preferably for copper tubing of diameter D equal to 28mm, the diameter d of the indentation 6 is approximately 8mm. The tube wall has a thickness of approximately 0.7mm.
In use, the coil 1 is mounted in a domestic hot water storage cylinder 2 in conventional fashion. Heating water passed through the coil 1, for example, from a central heating system, is used to heat water within the hot water cylinder 2 for domestic use. The indentations 6 in the coil 1 create turbulence within the heating water as it is delivered through the coil 1 and improved heat transfer is achieved. Thus, the water in the domestic hot water storage cylinder 2 is more rapidly heated than if a conventional heating coil 20 (see Fig 2) of the same length was used. Advantageously then since there is improved heat transfer the coil 1 can be made shorter than the conventional coil 20 while maintaining the same or better heat transfer properties. Thus production costs can be reduced.
Referring now in particular to Figs 5 to 7 there is illustrated an apparatus for forming the coil 1 indicated generally by the reference numeral 30. The apparatus 30 has a pair of complementary rollers 31, 32. Each roller 31, 32 has a U-shaped circumferential groove 33, 34 with a number of spaced-apart projections 35 on a side wall of each groove 33, 34. The projections 35 may be formed by steel balls embedded in the side wall. The rollers 31, 32 are rotatably mounted in contact on a support one above the other and are rotatable in opposite directions as indicated by the arrows in Fig 5. It will be noted that the grooves 33, 34 at the point of contact between the rollers 31, 32 form a circular channel for reception of the coil 5.
The coil 1 is formed by first bending an elongate copper tube to form a helical coil in similar fashion to a conventional heating coil. Then the coil is delivered between the rotating rollers 31, 32 at a speed of between 0.1 m/s and 0.15 m/s and the projections 35 on the rollers 31, 32 form the indentations 6 in a side wall of the tube 5 as it is delivered between the rollers 31, 32. Then, the fasteners 8 are soldered or braised onto each end of the tube 5.
The invention is not limited to the embodiment hereinbefore described which may be varied in both construction and detail.

Claims (3)

1. A tubular heating coil for a domestic hot water storage cylinder having a plurality of inwardly directed spacedapart indentations in a side wall of a tube from which 5 the coil is formed.
2. A heating coil as claimed in claim 1 wherein the indentations have a hemispherical shape and the ratio of the diameter of the tube and the diameter of the indentations is between 3:1 and 4:1. 10
3. A heating coil substantially as hereinbefore described with reference to Figs. 1, 3 and 4 of the accompanying drawings.
IE348490A 1990-09-28 1990-09-28 A heating coil IE64546B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IE348490A IE64546B1 (en) 1990-09-28 1990-09-28 A heating coil
GB9120693A GB2249163B (en) 1990-09-28 1991-09-27 A heating coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE348490A IE64546B1 (en) 1990-09-28 1990-09-28 A heating coil

Publications (1)

Publication Number Publication Date
IE64546B1 true IE64546B1 (en) 1995-08-23

Family

ID=11038723

Family Applications (1)

Application Number Title Priority Date Filing Date
IE348490A IE64546B1 (en) 1990-09-28 1990-09-28 A heating coil

Country Status (2)

Country Link
GB (1) GB2249163B (en)
IE (1) IE64546B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2708492B1 (en) * 1993-08-05 1995-10-20 Balon Roger Leopold Method and installation for the production of heat exchanger tubes and tubes obtained.
JP5254082B2 (en) 2009-03-05 2013-08-07 株式会社ユタカ技研 Heat exchange tube
CN104296579A (en) * 2014-07-29 2015-01-21 无锡塔尔基热交换器科技有限公司 Heat exchange tube, manufacturing method of heat exchange tube and heat exchanger with heat exchange tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2408886A1 (en) * 1974-02-23 1975-09-04 Buderus Eisenwerk Heat exchanger tube for a gaseous medium - has indentations, slanting to the tube axis
DE2814828C3 (en) * 1978-04-06 1981-07-09 Metallgesellschaft Ag, 6000 Frankfurt Gas cooler with internally ribbed lead pipes
SU1590927A1 (en) * 1988-12-13 1990-09-07 Proizv Ob Belgorodskij Z Energ Heat-exchange pipe

Also Published As

Publication number Publication date
GB9120693D0 (en) 1991-11-06
GB2249163A (en) 1992-04-29
GB2249163B (en) 1994-07-13

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Legal Events

Date Code Title Description
MK9A Patent expired