GB2081868A - Improvements in or relating to heat exchangers and/or silencers - Google Patents

Improvements in or relating to heat exchangers and/or silencers Download PDF

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Publication number
GB2081868A
GB2081868A GB8123970A GB8123970A GB2081868A GB 2081868 A GB2081868 A GB 2081868A GB 8123970 A GB8123970 A GB 8123970A GB 8123970 A GB8123970 A GB 8123970A GB 2081868 A GB2081868 A GB 2081868A
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GB
United Kingdom
Prior art keywords
compressed air
heat exchanger
path
wall
pipe
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
Application number
GB8123970A
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GB2081868B (en
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8123970A priority Critical patent/GB2081868B/en
Publication of GB2081868A publication Critical patent/GB2081868A/en
Application granted granted Critical
Publication of GB2081868B publication Critical patent/GB2081868B/en
Expired legal-status Critical Current

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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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F28D7/06—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 having a single U-bend
    • 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
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/224—Longitudinal partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/226—Transversal partitions

Landscapes

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

Abstract

A heat exchanger 10 comprises a hollow cylindrical body 11 closed at each end. A longitudinal wall extends axially in the body to define a path for compressed air extending between an inlet 15 and an outlet 16 formed in the body on opposite sides of the wall 14. A plurality of cooling pipes 21 extend along the compressed air path to remove heat from the compressed air. The longitudinal wall and the interior or surface of the body are acoustically lined to enhance the silencing effect of the heat exchanger. Heat exchangers of this type may be connected in series and a number of different internal wall arrangements are described. <IMAGE>

Description

SPECIFICATION Improvements in or relating to heat exchangers and/or silencers This invention relates to heat exchangers and in particular to heat exchangers for cooling compressed air and/or silencers for compressed air.
When air is compressed it becomes heated and therefore less dense. In many uses of compressed air it is desirable to increase its density by cooling the air. Up to now cooling units for compressed air have merely dissipated heat, resulting in a considerable waste in energy.
Air compressors may also be extremely noisy and it is often desirable to reduce the noise transmitted to the environment. Also the generation of compressed air causes pulsations and vibrations and hence much equipment, which can be used with normally flowing gas, cannot be used with compressed air.
It is an object of the present invention to provide an improved heat exchanger for compressed air.
From one aspect the present invention consists in a heat exchanger for compressed air comprising a hollow body defining a path for compressed air from an inlet to an outlet and a cooling fluid pipe extending along at least part of the compressed air path, the pipe being constructed and/or mounted in the hollow body such that it will withstand the pulsations and vibrations caused by compressed air flowing through the body.
The pipe may be generally formed as a U and extend into and out of the body at one end thereof, or alternatively the pipe may extend through the body. Preferably the heat exchanger includes a plurality of pipes.
The hollow body may include one or more longitudinal or transverse baffles or walls which at least partially define the compressed air path.
From another aspect the invention consists in a heat exchanger for compressed air comprising an elongate hollow body having a longitudinal wall extending into the body from one end thereof and along a part of the length thereof to define with the body a path for compressed air between an inlet and an outlet formed in the body on opposite sides of the longitudinal wall, a cooling fluid pipe extending into and out of the body through or adjacent to said one end and along at least a part of the compressed air path.
From a further aspect the invention consists in a heat exchanger having at least one transverse baffle extending part way into the body to define with the body a compressed air path between an inlet and an outlet formed in the body and a cooling fluid pipe extending along a part of the compressed air path.
The pipe may extend through at least one transverse baffle, and in one form of the invention the pipe may be generally in the form of a U. Additionally or alternatively the pipe may extend as a spiral along at least part of its length.
In any of the above cases, the pipe may be provided with a flange or projection to assist heat exchange. The projection or flange may be in the form of an axially extending spiral fluting rib or ribs.
The heat exchanger of any of the above cases may further constitute a silencer for a source of compressed air attached to its inlet.
In this latter case any wall or baffle may be an acoustic wall or baffle e.g. a sound absorbing wall or baffle.
The invention further includes a plurality of heat exchangers as hereinbefore defined connected in series.
The invention still further consists in a silencer for a compressed air source comprising a hollow elongate body having at least one acoustic wall or baffle extending into the body to define with the body a path for compressed air between an inlet and an outlet formed in the body.
The invention may be performed in various ways, specific embodiments of which will now be described with reference to the accompanying drawings, in which Figure 1 is a diagrammatic side view of a heat exchanger; Figure 2 is a side view of a section of cooling fluid pipe for use in the heat exchanger of Figure 1; Figure 3 is a diagrammatic side view of an alternative form of heat exchanger; Figure 4 is a schematic view showing two Figure 3 heat exchangers connected in series; Figure 5 is a schematic view showing two Figure 1 heat exchangers connected in series; and Figure 6 is a side view of an alternative form of cooling fluid pipe for use in the heat exchangers.
Figure 1 shows a heat exchanger for use with compressed air, which will cool the compressed air usefully removing the heat therefrom, reduce the noise level generated by the air compressor which is transmitted to the environment, and which will withstand the pulsations and vibrations set up by the compressed air and the compressor.
The heat exchanger 10 comprises a hollow cylinderical body 11 which is closed at its upper end by a double header 12 and at its lower end by a condensation trap 13.
A longitudinal wall or baffle 14 extends axially into the body 11 from the upper end to a point spaced from the lower end of body 11 to define within the body 11 a path for compressed air extending between an inlet 15 and an outlet 16 formed in the body on opposite sides of the wall 14. The compressed air path is indicated by arrows 17.
A perforated baffle 18 is disposed in the inlet 15 to decelerate the compressed air as it enters the hollow body 11.
The double header 12 is divided into an inlet portion 19, which is connected to a source of cold water, or other cooling fluid, and an outlet portion 20, which is connected to a hot water reservoir (not shown). A plurality of pipes 21, which are shown schematically, for the water or other cooling fluid, extend from the inlet portion 19 down the length of the body 11, aroundthe bottom of wall 14and upto the outlet portion 20.
Thus, when compressed air is passed through the body along path 17, it is cooled by water flowing in the opposite direction in pipes 21. The heated water can then be used elsewhere in the premises for heating, washing or in an industrial process.
Each pipe 21 is preferably formed with axially extending spiral fluting ribs as shown in Figure 2.
The fluting ribs serve both to increase the exposed surface area of the pipes and thus increase the rate of heat exchange and to improve the rigidity of the pipes. The added rigidity given to the pipes means that they are more able to withstand the pulsations and vibrations caused by the compressed air. This means that soft metals such as copper or its alloys, which have a high thermal conductivity, can be used.
Alternatively, the pipes 21 may be formed with fins, for example as shown at 23, or other surface area increasing profiles, and may be twisted about their longitudinal axes. In some cases it may be necessary to form the pipes of steel or other strong metal to enable the pipes to withstand the pulsations or vibrations. Brackets may be provided within the body 11 to hold the pipes against vibration.
To further increase heat exchange the pipes 21 may be formed as a spiral along at least part of their length (see Figure 6).
The longitudinal wall may be formed as an accoustic baffle to increase the silencing effect of the apparatus and the inner wall of the body may be lined with sound absorbing material. The body is preferably formed from heavy guage or heavy duty material.
Thermometers 24 may be provided to indicate the water and air temperatures and the outlet portion 20 may be provided with a relief valve 22.
In some instances it may be desirable to connect the heat exchanger 10 the otherway up into the compressed air line in order to allow the pipes 21 to be drained.
The longitudinal wall may be replaced or supplemented by spaced transverse baffles or walls mounted alternately to extend the compressed air path within the cylinder. These transverse baffles or walls may have sound absorbing properties.
Figure 3 shows a further embodiment of the invention in which the compressed air path is defined buy a series of spaced alternative transverse baffles or walls 25, in which the inlet 15 and the outlet 16 are spaced longitudinally, in which a cold water header 26 is provided at one end of the body and a hot water header 27 is provided at the other end of the body and in which pipes 21 extend between the two headers. The transverse walls or baffles 25 may be accoustic walls or baffles.
Figure 4 shows how heat exchangers of Figure 3 can be linked together in series by inverting the second heat exchanger and suitably connecting the headers.
Figure 5 shows a similar arrangement for the Figure 1 heat exchanger.
It will be appreciated that if the apparatus is to be used as a silencer alone, the pipes can be dispensed with and the headers replaced by blocking off plates.

Claims (15)

1. A heat exchanger for compressed air, comprising a hollow body defining a path for compressed air from an inlet to an outlet and a cooling fluid pipe extending along at least part of the compressed air path, the pipe being constructed and/or mounted in the hollow body such that it will withstand the pulsations and vibrations caused by compressed air flowing through the body.
2. A heat exchanger as claimed in claim 1, wherein the pipe is U-shaped.
3. A heat exchanger as claimed in claim 1, wherein the pipe extends through the body.
4. A heat exchanger as claimed in any one of claims 1 to 3, wherein the heat exchanger includes a plurality of pipes.
5. A heat exchanger as claimed in any one of the preceding claims, wherein the hollow body includes one or more longitudinal or transverse baffles or walls which at least partially define the compressed air path.
6. A heat exchanger for compressed air, comprising an elongate body having a longitudinal wall or baffle extending into the body from one end thereof and along a part of the length thereof to define with the body a path for compressed air between an inlet and an outlet formed in the body on opposite sides of the longitudinal wall, a cooling fluid pipe extending into and out of the body through or adjacent to said one end and along at least a part of the compressed air path.
7. A heat exchanger having at least one transverse baffle or wall extending part way into the body to define with the body a compressed air path between an inlet and an outlet formed in a body and a cooling fluid pipe extending along at least a part of the compressed air path.
8. A heat exchanger as claimed in claim 7, wherein the pipe extends through at least one transverse baffle or wall.
9. A heat exchanger as claimed in any one of claims 6 to 8, wherein the pipe is U-shaped or extends as a spiral along at least part of its length.
10. A heat exchanger as claimed in any one of the preceding claims wherein the pipe is provided with a flange or projection to assist heat exchange.
11. A silencer for a compressed air source, comprising a heat exchanger as claimed in any one of the preceding claims.
12. A silencer as claimed in claim 11, wherein a wall or baffle is an acoustic wall or baffle.
13. A silencer for a compressed air source, comprising a hollow elongate body having at least one acoustic wall or baffle extending into the body to define with the body a path for compressed air between an inlet and an outlet formed in the body.
14. A heat exchanger for compressed air as herein before described with reference to the accompanying drawings.
15. A silencer for compressed air as hereinbefore described with reference to the accompanying drawings.
GB8123970A 1980-08-07 1981-08-05 Improvements in or relating to heat exchangers and/or silencers Expired GB2081868B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8123970A GB2081868B (en) 1980-08-07 1981-08-05 Improvements in or relating to heat exchangers and/or silencers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8025749 1980-08-07
GB8123970A GB2081868B (en) 1980-08-07 1981-08-05 Improvements in or relating to heat exchangers and/or silencers

Publications (2)

Publication Number Publication Date
GB2081868A true GB2081868A (en) 1982-02-24
GB2081868B GB2081868B (en) 1984-04-26

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Application Number Title Priority Date Filing Date
GB8123970A Expired GB2081868B (en) 1980-08-07 1981-08-05 Improvements in or relating to heat exchangers and/or silencers

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152204A (en) * 1983-12-30 1985-07-31 Smidth & Co As F L Heat exchanger
EP0382098A2 (en) * 1989-02-10 1990-08-16 Mitsubishi Jukogyo Kabushiki Kaisha Multi-tube type heat transfer apparatus
WO2005075927A1 (en) * 2004-02-10 2005-08-18 Scania Cv Ab (Publ) Method and device for cooling of air from compressors
WO2005095879A1 (en) * 2004-04-01 2005-10-13 Aalborg Industries A/S Heat exchanger and boiler comprising the heat exchanger
WO2008112549A2 (en) * 2007-03-09 2008-09-18 Johnson Controls Technology Company Heat exchanger

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152204A (en) * 1983-12-30 1985-07-31 Smidth & Co As F L Heat exchanger
EP0382098A2 (en) * 1989-02-10 1990-08-16 Mitsubishi Jukogyo Kabushiki Kaisha Multi-tube type heat transfer apparatus
EP0382098A3 (en) * 1989-02-10 1990-11-07 Mitsubishi Jukogyo Kabushiki Kaisha Multi-tube type heat transfer apparatus
WO2005075927A1 (en) * 2004-02-10 2005-08-18 Scania Cv Ab (Publ) Method and device for cooling of air from compressors
WO2005095879A1 (en) * 2004-04-01 2005-10-13 Aalborg Industries A/S Heat exchanger and boiler comprising the heat exchanger
WO2008112549A2 (en) * 2007-03-09 2008-09-18 Johnson Controls Technology Company Heat exchanger
WO2008112549A3 (en) * 2007-03-09 2008-12-24 Johnson Controls Tech Co Heat exchanger

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Publication number Publication date
GB2081868B (en) 1984-04-26

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PCNP Patent ceased through non-payment of renewal fee