GB2361993A - Ventilation System with Heat Recovery Unit - Google Patents

Ventilation System with Heat Recovery Unit Download PDF

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Publication number
GB2361993A
GB2361993A GB0105309A GB0105309A GB2361993A GB 2361993 A GB2361993 A GB 2361993A GB 0105309 A GB0105309 A GB 0105309A GB 0105309 A GB0105309 A GB 0105309A GB 2361993 A GB2361993 A GB 2361993A
Authority
GB
United Kingdom
Prior art keywords
region
air
heat recovery
recovery unit
heat
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.)
Withdrawn
Application number
GB0105309A
Other versions
GB0105309D0 (en
Inventor
Robert Donald Aldo Spearman
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB0105309D0 publication Critical patent/GB0105309D0/en
Publication of GB2361993A publication Critical patent/GB2361993A/en
Withdrawn legal-status Critical Current

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
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
    • F24F8/194—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages by filtering using high voltage
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the 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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
    • F28F3/10—Arrangements for sealing the margins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/08—Fastening; Joining by clamping or clipping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Ventilation (AREA)

Abstract

A ventilation system for a room 2 has an extract vent 30 with a filter 31 located in a warm region and connected with an adjacent inlet vent 46 via a fan 33 and a heat recovery unit 41. Air extracted from the warm region is filtered, cooled and returned to the same region. A duct 50 extends from outside the room 2 to a second region in the room remote from the first region and is coupled with the heat recovery unit 41. Cool air from outside the room is thereby warmed by the heat extracted from the warm region and this warmed, fresh air is supplied to the second region. A parallel plate heat recovery unit is used, where one or both sides of each plate is formed with an array of dimples to promote heat transfer.

Description

2361993 VENTILATION SYSTEMS AND HEAT RECOVERY This invention relates to
ventilation systems and heat recovery.
In various building spaces there can be regions where there is excessive heat or pollution and different regions where maximum supply of fresh air is needed. For example, in pubs and clubs body heat in the centre of the room can raise the temperature above a comfortable level and there may also be excessive levels of smoke or alcohol fumes. It is preferable, however, that any fresh aix supplied to such a room be delivered preferentially to the region behind the bar where staff work since they are exposed to the enviromnent for prolonged periods. In conventional situations of this kind, extractor fans are provided in the main part of the room to vent the smoke and excessive heat, and air inlets open in the bar region so that fresh air is supplied to the bar region. The problem with such an arrangement is that the heat in the air vented externally is lost and that energy has to be consumed to warm the inlet fresh air.
Heat recovery units are commonly used to transfer some of the heat in air exhausted from a room to fresh air. Such heat recovery units can have a high efficiency of heat transfer but usually have a relatively high resistance to flow, which can make them unsuitable for some applications.
It is an object of the present invention to provide an alternative ventilation system.
2 According to the present invention there is provided a building ventilation system including an extract vent located in a first region, a first air mover for extracting air from the first region and causing it to flow to an inlet vent located adjacent the first region via air treatment means and via a first path through a heat recovery unit solhat a part of the heat in air passing along the first path is given up to the heat recovery unit, a duct extending between a second region remote from the first region and a third region, and a second air mover for supplying air along the duct between the second and third regions, the duct communicating with the heat recovery unit such that air flowing along the duct flows along a second path through the heat recovery unit and takes up a part of the heat in the heat recovery unit so that air emerging into the second region is warmed by the heat recovery unit.
The air treatment means preferably includes a filter. The heat recovery unit may include a stack of thermally-conductive plate members spaced one above the other and providing the first and second paths through the heat recovery unit between pairs of adjacent plate members whereby heat in air flowing along one path is conducted through the plate members to warm air flowing along the other path. The plate members are preferably formed at least on one surface with an array of dimples arranged to promote transfer of heat between the air and the plate members. The plate members are preferably of metal and may be supported with one another by clips at their edges. The first and second air movers are preferably separate fans. The exhaust vent and inlet vent may be on opposite sides of the duct. The second region is preferably in the same room as the first region but the third region is preferably outside the room. The system may be ceiling mounted.
3 A ventilation system and heat recovery unit according to the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of the ventilation system installed in a room; Figure 2 is an enlarged perspective view of a part of the system of Figure 1; Figure 3 is a schematicperspective view of the heat recovery unit; and Figure 4 is a more detailed perspective view of the heat recovery unit.
With reference first to Figures 1 and 2, the ventilation system is indicated generally by the numeral 1 and is installed in a room 2 of a building having an outside wall 3. The room 2 has a first region 20, in which smoke or other contaminants and excess heat is generated and a different region 21 where the environment must be kept as unpolluted as possible for the comfort and health of workers in this region. The ventilation system 1 is installed within the ceiling 4 of the room or may be fastened beneath the ceiling.
The ventilation system 1 has an extract vent 30 located in the warm, polluted region 20, which includes a smoke filter 3 1, such as an electrostatic filter. Alternative air treatment means could be used, such as humidifiers or dehumidifiers, electrostatic particle removers, ionizers or the like. The vent 3 0 forms the lower wall of a box-like casing 3 2 containing a conventional fan or other air mover 33. The casing 32 opens on one side 34, the fan 33 being 4 arranged to draw air in through the vent 30 and filter 31 and to expel it through the open side. The open, downstream side 34 connects with one side 40 of a heat exchange or heat recovery unit 41 having a square shape in section.
The heat recovery unit 41 may contain any conventional heat recovery element of the kind having two separate air flow paths by which heat in air flowing along one path is transferred in part to air flowing along the other path. Preferably, however, the heat recovery element 42 is of the kind shown in Figures 3 and 4, the construction of which will be described later. 1 Air supplied to the inlet side 40 of the heat recovery unit 41 flows through and out of its opposite, outlet side 44, after having given up a part of its heat to the heat recovery element 42. The outlet side 44 of the heat recovery unit 41 connects with a short diverter 45 having a curved upper wall and opening at its lower surface through the ceiling 3 via an inlet vent 46. Warm, smoke-laden air is, therefore, drawn from the region 20 through the extract vent 30, it is filtered by the filter 3 1, cooled by the heat recovery unit 41 and is returned to the room 1 via the inlet vent 46 close to the extract vent and in the same region.
The system also includes a duct 50 extending at right angles to the air flow path between the extract and inlet vents 30 and 46. The duct 5 0 opens at one end 5 1, externally of the room 1, through a hole 52 in the wall 3. A fan 53 is mounted at some position along the duct 50, so as to draw external air into and along the duct. The opposite end 54 of the duct 50 opens through an inlet vent 55 located in the second region 2 1. Between its two ends 51 and 54, the duct 50 is connected in series with the heat recovery unit 41 so that all the air passing along the duct flows through the heat recovery unit along a path separate from the path of air extracted from within the room. The relatively cold air from outside the room 1 is, therefore, warmed by passage through the heat recovery unit 41. The air delivered at the vent 55 to the region 21 is, therefore, fresh external air but is warmed above the outside temperature.
Referring now to Figures 3 and 4, the construction of the heat recovery unit 41 will be described in more detail. The heat recovery unit 41 has a recovery element 42 comprising a stack of several thin plates 43 of aluminium, about 0.25mm thick. Alternatively, some other heat conducting material could be used. The plates 43 are each formed with dimples 64 over one or, preferably, both surfaces, such as by CNC machining. The dimples 64 are preferably about 3nun deep and 4nun wide and the spacing between adjacent dimples is preferably about 15mm and no more than about 25mm. The plates 43 are retained spaced above one another in a stack by means of edge clips 65.
The clips 65 are extruded or formed from a spring metal or plastics and have two parallel channels 66 spaced from one another across the width of the clip by a spacer section 67. The dimensions of the channels 66 are such that they engage resiliently the edges of the plates 43, the width of the spacer section 67 being selected to produce the desired spacing between the plates. The stack of plates has four sides A, B, C and D, two clips 65 are used to retain the lowest pair of two plates 43 in the stack with one another, the clips being fastened to opposite edges of the adjacent plates on sides A and C. A flirther pair of clips 65 is fastened to the other two edges of the second and third plates 43 in the stack on sides B and D. A third pair of clips is fastened to the third and fourth plate 43 on sides A and C and so on. The ends of the clips 65 are mitred at 45' so that clips engaging adjacent edges of the same 6 plate can fit together. The complete stack of plates 43 provides, therefore, two isolated, orthogonal air flow paths through it parallel to the planes of the plates. Each air flow path comprises a number of parallel paths between adjacent pairs of plates 43 and opening at those edges not blocked by clips 65. The dimples 64 on the plates 43 have been found to disturb air flow sufficiently to produce efficient transfer of heat between the air and the plates without significantly increasing resistance to flow. Heat given up to the plates 43 by air flowing along one path is readily conducted through the thickness of the plates to their opposite surface where heat is given up to air flowing along the other path. The efficiency of heat transfer between the two different air flow paths can be increased by reducing the spacing between the plates 43 but with the penalty of an increased resistance to flow. In the present application it is more important for the heat recovery unit 41 to provide a low resistance to flow so that the maximum volume of air can be filtered.
The ventilation system of the present invention provides air cleaning and cooling in regions of maximum contamination and excess heat, and also enables the heat extracted from the contaminated air to be used to warm fresh air supplied to a different region.
It will be appreciated that the heat recovery unit of the present invention could be used in other systems and is not confined to use in the system of the present invention.
7

Claims (13)

1. A building ventilation system including an extract vent located in a first region, a first air mover for extracting air from the first region and causing it to flow to an inlet vent located adjacent said first region via air treatment means and via a first path through a heat recovery unit so that a part of the heat in air passing along the first path is given up to the heat recovery unit, a duct extending between a second region remote from the first region and a third region, and a second air mover for supplying air along the duct between the second and. third regions, wherein the duct communicates with the heat recovery unit such that air flowing along the duct flows along a second path through the heat recovery unit and takes up a part of the heat in the heat recovery unit so that air emerging into the second region is warmed by the heat recovery unit.
2. A system according to Claim 1, wherein the air treatment means includes a filter.
3. A system according to Claim 1 or 2, wherein the heat recovery unit includes a stack of a plurality of thermally-conductive plate members spaced above one another and providing the first and second paths through the heat recovery unit between pairs of adjacent plate members whereby heat in air flowing along one path is conducted through the plate members to warm air flowing along the other path.
4. A system according to Claim 3, wherein the plate members are formed at least on one surface with an array of dimples arranged to promote transfer of heat between the air and the plate members.
8
5. A system according to Claim 3 or 4, wherein the plate members are of a metal.
6. A system according to any one of Claims 3 to 5, wherein the plate members are supported with one another by clips at their edges.
7. A system according to any one of the preceding claims, wherein the first and second air movers are separate fans.
8. A system according to any one of the preceding claims, wherein the exhaust vent and inlet vent are on opposite sides of the duct.
9. A system according to any one of the preceding claims, wherein the second region is in the same room as the first region.
10. A system according to Claim 9, wherein the third region is outside the room.
11. A system according to any one of the preceding claims, wherein the system is ceiling mounted.
12. A system substantially as hereinbefore described with reference to the accompanying drawings.
13. Any novel and inventive feature or combination of features as hereinbefore described.
GB0105309A 2000-03-10 2001-03-05 Ventilation System with Heat Recovery Unit Withdrawn GB2361993A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0056564 2000-03-10

Publications (2)

Publication Number Publication Date
GB0105309D0 GB0105309D0 (en) 2001-04-18
GB2361993A true GB2361993A (en) 2001-11-07

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GB0105309A Withdrawn GB2361993A (en) 2000-03-10 2001-03-05 Ventilation System with Heat Recovery Unit
GB0105310A Withdrawn GB2361991A (en) 2000-03-10 2001-03-05 A Heat Recovery Unit

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB0105310A Withdrawn GB2361991A (en) 2000-03-10 2001-03-05 A Heat Recovery Unit

Country Status (1)

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GB (2) GB2361993A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106017142A (en) * 2016-07-01 2016-10-12 无锡市豫达换热器有限公司 Fresh air and waste air heat exchanger
CN106196402A (en) * 2016-08-31 2016-12-07 广州西奥多科技有限公司 A kind of multifunction energy-saving aerarium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2018175B1 (en) * 2017-01-16 2018-07-26 Recair Holding B V Recuperator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029573A2 (en) * 1979-11-24 1981-06-03 Uwe Klix Heat exchangers, their formation and arrangement in an installation for heat recovery by exchange of air, in particular for dwelling houses and comparable lay-outs
WO1981003064A1 (en) * 1980-04-17 1981-10-29 Bahco Ventilation Ab An arrangement in a heat recovery unit
GB2175081A (en) * 1985-05-16 1986-11-19 Erling Berner Air cleaning and heat exchanging apparatus
US5000253A (en) * 1988-03-31 1991-03-19 Roy Komarnicki Ventilating heat recovery system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1210228A (en) * 1966-11-10 1970-10-28 Svenska Rotor Maskiner Ab Improvements in and relating to heat exchangers
US4858685A (en) * 1982-12-06 1989-08-22 Energigazdalkodasi Intezet Plate-type heat exchanger
FR2575279B1 (en) * 1984-12-21 1989-07-07 Barriquand PLATE HEAT EXCHANGER
NL9200698A (en) * 1992-04-16 1993-11-16 Abb Lummus Heat Transfer PLATE HEAT EXCHANGER AND METHOD FOR THE PRODUCTION THEREOF.
US5469914A (en) * 1993-06-14 1995-11-28 Tranter, Inc. All-welded plate heat exchanger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029573A2 (en) * 1979-11-24 1981-06-03 Uwe Klix Heat exchangers, their formation and arrangement in an installation for heat recovery by exchange of air, in particular for dwelling houses and comparable lay-outs
WO1981003064A1 (en) * 1980-04-17 1981-10-29 Bahco Ventilation Ab An arrangement in a heat recovery unit
GB2175081A (en) * 1985-05-16 1986-11-19 Erling Berner Air cleaning and heat exchanging apparatus
US5000253A (en) * 1988-03-31 1991-03-19 Roy Komarnicki Ventilating heat recovery system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPI AND PAJ ABSTRACTS: JP3117832 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106017142A (en) * 2016-07-01 2016-10-12 无锡市豫达换热器有限公司 Fresh air and waste air heat exchanger
CN106196402A (en) * 2016-08-31 2016-12-07 广州西奥多科技有限公司 A kind of multifunction energy-saving aerarium

Also Published As

Publication number Publication date
GB0105310D0 (en) 2001-04-18
GB2361991A (en) 2001-11-07
GB0105309D0 (en) 2001-04-18

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Legal Events

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)