DK168773B1 - Ventilation system with cross-flow type heat exchanger - Google Patents

Ventilation system with cross-flow type heat exchanger Download PDF

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Publication number
DK168773B1
DK168773B1 DK025291A DK25291A DK168773B1 DK 168773 B1 DK168773 B1 DK 168773B1 DK 025291 A DK025291 A DK 025291A DK 25291 A DK25291 A DK 25291A DK 168773 B1 DK168773 B1 DK 168773B1
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Denmark
Prior art keywords
heat exchanger
damper
pass
inlet
ventilation system
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DK025291A
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Danish (da)
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DK25291A (en
DK25291D0 (en
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Torgil Stark
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Stratos Ventilation Prod Ab
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
    • 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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Flow Control Members (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Conditioning Control Device (AREA)

Description

i DK 168773 B1in DK 168773 B1

Opfindelsen vedrører et ventilationsanlæg med pladevarmeveksler af krydsstrømstypen omfattende, mindst én varmevekslercelle med flere indbyrdes, i det væsentlige parallelle plader, som mellem sig danner 5 hosliggende, indbyrdes krydsende gennemstrømningskanaler for indløbsluft, som normalt udgøres af relativ kold udeluft, respektive udløbsluft, som normalt udgøres af relativ varm afgangsluft, en til varmevekslercellen stødende by-pass-kanal til gennemstrømning af 10 indløbsluft forbi varmevekslercellen under, visse driftsbetingelser, et svingbart lejret varmevekslerspjæld som i åben stilling frilægger gennemstrømningskanalerne for indløbsluft og i lukket stilling aflukker disse, og et med varmevekslerspjældet stift forbundet 15 by-pass-spjæld, som i åben stilling af varmevekslerspjældet i det mindste delvis aflukker by-pass-kanalen og i lukket stilling af varmevekslerspjældet frilægger denne.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a ventilation system with cross-flow type plate heat exchanger comprising at least one heat exchanger cell having a plurality of substantially parallel plates forming between, intersecting, intersecting flow ducts for inlet air, which is usually comprised of relatively cold outdoor air, of relatively hot exhaust air, a by-pass channel adjacent to the heat exchanger cell for flowing inlet air past the heat exchanger cell under, certain operating conditions, a pivotally mounted heat exchanger damper which in open position exposes the flow channels for inlet air and in closed shutoff, and in closed position connected by-pass damper which in the open position of the heat exchanger damper at least partially closes the by-pass duct and in closed position of the heat exchanger damper.

Et sådant anlæg er kendt fra FI fremlæggelses-20 skrift nr. 76 420, hvorved to varmevekslerceller er beliggende indbyrdes adskilt til dannelse af en fælles by-pass-kanal mellem cellerne. De til hver sin varmevekslercelle hørende varmevekslerspjæld er lejret svingbart omkring en aksel, der er beliggende langs med 25 varmevekslercellens kant langs by-pass-kanalen, nemlig i det væsentlige et plan gennem den nærmest ved by-pass-kanalen beliggende varmevekslerplade. Varmevekslerspjældet strækker sig i lukket stilling et stykke indad over by-pass-kanalens indløbsåbning og går over i 30 en udadrettet by-pass-spjældplade, der danner en spids vinkel med varmevekslerspjældpladen. Herved søges opnået, at hver spjældplade (efter svingning til åben stilling) skal danne et indadrettende ledelement for indløbsluftstrømmen mod varmevekslercellens gennemstrøm-35 ningskanaler respektive by-pass-kanalen, hvorved de to by-pass-kanalplader efter svingning til lukkestilling aflukker by-pass-kanalens indløbsåbning.Such a plant is known from FI Publication 20 76420, whereby two heat exchanger cells are spaced apart to form a common by-pass channel between the cells. The heat exchanger cell of each heat exchanger cell is mounted pivotally about a shaft located along the edge of the heat exchanger cell along the by-pass channel, namely, a plane through the heat exchanger plate adjacent to the by-pass channel. The heat exchanger damper extends in a closed position a bit inwardly over the inlet opening of the by-pass duct and enters an outward by-pass damper plate which forms a pointed angle with the heat exchanger damper plate. Hereby it is achieved that each damper plate (after oscillation to open position) must form an inwardly directed guide element for the inlet air flow towards the heat exchanger cell through-pass ducts and by-pass duct respectively, whereby the two by-pass duct plates after oscillation to close position by-pass channel inlet opening.

2 DK 168773 B12 DK 168773 B1

Imidlertid har dette kendte arrangement visse ulemper. Ved at de to spjældplader danner en spids vinkel med hinanden, må disse spjældplader svinges mere 0 end 90 mellem de respektive lukkede endestillinger. En 5 så stor svingningsvinkel i kombination med kravet om et stort drejningsmoment i hver endestilling (for opnåelse af en effektiv lukning) medfører, at der må anvendes kraftige, dyre og pladskrævende stilleorganer. Desuden kræves et stort frirum til optagelse af varmeveksler- 0 10 spjældets svingningsbevægelse over 90 . Disse ‘'Ulemper kan ikke elimineres ved at lade spjældpladerne danne en stump vinkel med hinanden, fordi luftstrømmene derved vil blive forstyrret af den i åben stilling skråtstillede spjældplade, hvilket resulterer i turbulens, tryk-15 fald og belastning på spjældindretningen.However, this known arrangement has certain disadvantages. Because the two damper plates form an acute angle with each other, these damper plates must be pivoted more than 90 between the respective closed end positions. Such a large angle of vibration in combination with the requirement for a large torque in each end position (to obtain an effective closure) means that powerful, expensive and space-consuming quieting means must be used. In addition, a large free space is required for recording the heat exchanger movement of the damper over 90. These disadvantages cannot be eliminated by allowing the damper plates to form a blunt angle with one another because the air flows will thereby be disturbed by the openly inclined damper plate, resulting in turbulence, pressure drop and load on the damper device.

På denne baggrund er det hensigten med opfindelsen at tilvejebringe et forbedret ventilationsanlæg af den indledningsvis angivne art, hvor spjældindretningen blot behøver at svinges en moderat vinkel, således at 20 den kan manøvreres driftsikkert med forholdsvis simple og billige stilleorganer. Yderligere er det hensigten at opnå en enkel mekanisk opbygning, fordelagtige strømningsforhold samt mulighed for at bevirke en hurtig omstilling af spjældindretningen.In view of the foregoing, it is the object of the invention to provide an improved ventilation system of the type initially described, in which the damper device only needs to be pivoted at a moderate angle so that it can be operated reliably with relatively simple and inexpensive stills. Further, it is intended to achieve a simple mechanical structure, advantageous flow conditions as well as the opportunity to effect a rapid change of the damper device.

25 Disse hensigter opnås ifølge opfindelsen med de træk som angives i krav 1 kendetegnende del. Således er varmevekslerspjældets svingningsaksel orienteret vinkelret på varmevekslerpladens plan og placeret langs en hjørnekant i varmevekslercellen. En indløbs- eller ud-30 løbspassage slutter an til by-pass-kanalen og har en indløbs- respektive udløbsåbning orienteret parallelt med varmevekslerpladernes plan. Denne indløbs- eller udløbsåbning tillukkes ved lukning af varmevekslerspjældet ved hjælp af en by-pass-spjældplade, som er 35 fast forbundet med og er sluttet vinkelret til et kantparti af varmevekslerspjældet og fungerer som skyde- , DK 168773 B1 3 spjæld i forhold til by-pass-kanalens indløbs- eller udløbsåbning, hvilket sker under udførelse af en svingningsbevægelse i spjældets plan under lukning eller åbning.These objects are achieved according to the invention with the features as defined in claim 1. Thus, the pivot shaft of the heat exchanger is oriented perpendicular to the plane of the heat exchanger plate and located along a corner edge of the heat exchanger cell. An inlet or outlet passage adjoins the by-pass channel and has an inlet and outlet port respectively oriented parallel to the plane of the heat exchanger plates. This inlet or outlet opening is closed by closing the heat exchanger damper by means of a by-pass damper plate, which is fixedly connected to and connected perpendicular to an edge portion of the heat exchanger damper and acts as a fire-damper. The inlet or outlet opening of the pass channel, which occurs during a swinging movement in the plane of the damper during closing or opening.

5 Ventilationsanlægget ifølge opfindelsen er for trinsvis (på i og for sig kendt måde, jf. det ovenfor nævnte FI fremlæggelsesskrift) opbygget med mindst to varmevekslerceller placeret på hver sin side af en fælles by-pass-kanal (eller flere sådanne enheder pla-10 ceret side om side). For ved en sådan opbygning-at kunne opnå en særlig enkel og pålidelig mekanisk konstruktion, som desuden muliggør skiftevis, intermitterende drift til afrimning af én varmevekslercelle ad gangen, afgrænses indløbs- eller udløbspassagen til by-pass-15 kanalen hensigtsmæssig af et båndformet vægparti beliggende i by-pass-kanalens forlængelse (på indløbsrespektive udløbssiden), således at hver varmevekslercelle tilordnes en indløbs- respektive udløbsåbning, som samvirker med den med varmevekslerspjældet forenede 20 by-pass-spjældplade.The ventilation system according to the invention is incrementally built (in a manner known per se, cf. the above-mentioned FI presentation), with at least two heat exchanger cells located on one side of a common by-pass channel (or several such units pla-10). side by side). In order to achieve such a structure, a particularly simple and reliable mechanical construction which also enables alternating intermittent operation for defrosting one heat exchanger cell at a time, the inlet or outlet passage to the bypass duct is conveniently delimited by a band-shaped wall portion located in the extension of the by-pass duct (on the inlet-responsive outlet side), so that each heat exchanger cell is assigned an inlet and outlet opening, respectively, which cooperates with the 20 by-pass damper plate united with the heat exchanger.

Øvrige hensigtsmæssige udførelsesformer fremgår af underkravene 3-10. Ifølge krav 10 kan således ventilationsanlægget omstilles på fordelagtig måde mellem forskellige driftsforhold, under styring af en føler 25 for indløbsluftens temperatur, især en udelufttempera-turføler, nemlig mellem såkaldt sommerdrift (med alle varmevekslerspjæld lukkede og al luft strømmende ud gennem respektive by-pass-kanaler), såkaldt vinterdrift (med alle varmevekslerspjæld åbne og by-pass-spjældene 30 lukkede) og såkaldt afrimningsdrift, hvorved én varmevekslercelle ad gangen aflukkes og indløbsluften fordeles mellem den til den lukkede varmevekslercelle hørende by-pass-kanal og de øvrige åbne varmevekslerceller. Herigennem kan under afrimningen den totale luftstrøm 35 holdes i det væsentlige konstant, hvis varmegenvindingen opretholdes og samtlige varmevekslerceller holdes 4 DK 168773 B1 frie fra is, der ellers kan forringe varmegenv ind ingen eller til og med blokere gennemstrømningskanalerne. Omstillingen mellem forskellige driftstilstande kan udføres hurtigt og effektivt takket være de relativt små 5 svingningsvinkler for spjældindretningerne og den enkle mekaniske opbygning, hvilket sikrer pålidelig drift og lang livslængde for indretningen.Other suitable embodiments are set forth in subclaims 3-10. Thus, according to claim 10, the ventilation system can be advantageously switched between different operating conditions, under the control of a sensor 25 for the temperature of the inlet air, in particular an outdoor air temperature sensor, namely between so-called summer operation (with all heat exchanger valves closed and all air flowing through the respective by-pass. channels), so-called winter operation (with all heat exchanger dampers open and by-pass dampers 30 closed), and so-called defrost operation, whereby one heat exchanger cell at a time is shut off and the inlet air is distributed between the by-pass duct of the closed heat exchanger cell and the other open heat exchanger. Hereby, during defrosting, the total air flow 35 can be kept substantially constant if heat recovery is maintained and all heat exchanger cells are kept free of ice which may otherwise impair heat recovery or even block the flow channels. The switching between different operating modes can be carried out quickly and efficiently thanks to the relatively small angles of rotation of the damper devices and the simple mechanical construction, which ensures reliable operation and long service life of the device.

Opfindelsen vil nu bive forklaret nærmere ved hjælp af en udførelsesform af opfindelsen og med hen-10 visning til tegningen på hvilken fig. 1 skematisk viser et ventilationsanlæg ifølge opfindelsen med en pladevarmeveksler til genvinding af varme fra udløbsluften (normalt afgangsluften) til indløbsluften (normalt udeluft), 15 fig. 2 et perspektivbillede (set skråt fra ven stre i fig. 1) af anlæggets pladevarmeveksler med tilhørende spjældindretning med begge varmevekslerspjæld lukkede, fig. 3 pladevarmeveksleren i fig... 2 med begge 20 varmevekslerspjæld åbne, fig. 4 pladevarmeveksleren i fig. 2 med ét varmevekslerspjæld åbent, og fig. 5 et tværsnit i pladevarmeveksleren i fig.The invention will now be explained in more detail by way of an embodiment of the invention and with reference to the drawing in which fig. 1 schematically shows a ventilation system according to the invention with a plate heat exchanger for recovering heat from the outlet air (normally the exhaust air) to the inlet air (usually outdoor air); Fig. 2 is a perspective view (oblique from left in Fig. 1) of the plate plate heat exchanger with associated damper device with both heat exchanger valves closed; 3 shows the plate heat exchanger in FIG. 2 with both 20 heat exchanger dampers open; FIG. 4 shows the plate heat exchanger of FIG. 2 with one heat exchanger damper open, and FIG. 5 is a cross-sectional view of the plate heat exchanger of FIG.

2.2nd

25 Det i fig. 1 viste ventilationsanlæg består i det væsentlige af en pladevarmeveksler 1 af krydsstrømstypen til genvinding af varme fra afkastluft, normalt relativ varm afgangsluft F til indløbsluft, normal relativ kold udeluft U, Afgangsluften F 30 strømmer via en indløbsdel 2 med et filter 3 via afgrænsende gennemstrømningskanaler i pladevarmeveksleren 1 til en udløbsdel 4 med en afgangsluftven-.tilator 5 og strømmer ud som afkastluft A. Udeluften U strømmer ind i en indløbsdel 6 med et filter 35 7 og en udelufttemperaturføler 8, via gennemstrømningskanaler, som ved hjælp af indbyrdes parallelle DK 168773 B1 5 plader 9 (se fig. 2) grænser op til gennemstrømnings -kanalerne for afgangsluften F, i pladevarmeveksleren 1 til en udløbsdel 10 med en luftvarmer 11 og en tilgangsluf tventilator 12 og strømmer ud som til-5 gangsluft T. Luftvarmeren 11 kan være elektrisk eller baseret på vand, og arbejder i afhængighed af tilgangsluftens T temperatur, der afføles ved hjælp af en føler 13, således at tilgangsluften T til stadighed holdes på det ønskede temperaturniveau, f.eks.The embodiment of FIG. 1, the ventilation system shown in Fig. 1 consists essentially of a plate heat exchanger 1 of the cross flow type for recovering heat from exhaust air, normally relatively hot exhaust air F to inlet air, normal relative cold outdoor air U, The exhaust air F 30 flows via an inlet part 2 with a filter 3 via boundary flow channels. the plate heat exchanger 1 to an outlet part 4 with an exhaust air fan 5 and outflows as exhaust air A. The outdoor air U flows into an inlet section 6 with a filter 35 7 and an outdoor air temperature sensor 8, through flow channels, which by means of mutually parallel DK 168773 B1 5 plates 9 (see Fig. 2) adjoin the flow ducts of the exhaust air F, in the plate heat exchanger 1 to an outlet part 10 with an air heater 11 and an inlet air fan 12 and flow out as inlet air T. The air heater 11 can be electric or based on water, and works depending on the temperature of the inlet air T sensed by a f beers 13 such that the supply air T is constantly maintained at the desired temperature level, e.g.

o 10 ca. +20 C.o 10 approx. +20 C.

Pladevarmeveksleren 1, som er tydeligere vist i fig. 2-5, består i dette udførelseseksempel af to adskilte varmevekslerceller 14 og 15, hvor det mellemliggende rum danner en by-pass-kanal 16 (se fig.The plate heat exchanger 1, which is more clearly shown in FIG. 2-5, in this embodiment, consists of two separate heat exchanger cells 14 and 15, the intermediate space forming a by-pass channel 16 (see FIG.

15 5), som på de mod indløbs- og udløbsdelene 2, 4 for afgangsluften vendende sider er tilsluttet ved hjælp af sidevægge 17, således at indløbsluft eller udeluft kan strømme frit gennem by-pass-kanalen 16, når en indløbspassage til denne er åben, hvilket vi-1 blive be-20 skrevet nærmere nedenfor.5) which is connected to the sides facing inlet and outlet parts 2, 4 for the exhaust air by means of side walls 17, so that inlet air or outdoor air can flow freely through the by-pass duct 16 when an inlet passage thereto is open , which we-1 will be described in more detail below.

Hver varmevekslercelle 14, 15 består af flere indbyrdes parallelle plader 9 (som antydet ovenfor), hvilke plader i det væsentlige er kvadratiske, således at varmevekslercellerne har form af en ku-25 bus eller et parallelepipidum med kvadratisk basisflade (i pladerne 9's plan), hvor varmevekslercellerne 14, 15 er placeret med diametralt modsatte hjørnekanter 18, 19 fastgjort ved hjælp af forholdsvis smalle, vertikale vægpartier 20, 21 ved øvre og nedre 30 vægge 22 respektive 23 i det kasseformede hus 24 (kun skematisk vist i fig. 1), i hvilket indretningen er placeret. De øvrige to hjørnekanter 25 og 26 er . forbundet til hver sin horisontale skillevæg 27 respektive 28 i huset 24.Each heat exchanger cell 14, 15 consists of several mutually parallel plates 9 (as indicated above), which plates are substantially square, such that the heat exchanger cells are in the form of a cubicle or a parallelepipid with a square base surface (in the plane of the plates 9). wherein the heat exchanger cells 14, 15 are positioned with diametrically opposed corner edges 18, 19 secured by relatively narrow vertical wall portions 20, 21 at upper and lower 30 walls 22 and 23, respectively, in the box-shaped housing 24 (only schematically shown in Figure 1), in which the device is located. The other two corner edges 25 and 26 are. connected to each horizontal partition wall 27 and 28 respectively in the housing 24.

35 Med henblik på tillukning af indløbsluftens eller udeluftens u gennemstrømningspassager 29 6 DK 168773 B1 (tilsvarende gennemstrømningspassager 30 for udløbsluften eller afgangsluften F holdes derimod til stadighed åbne) er pladeformede varmevekslerspjæld 31, 32 dimensionerede til at dække hele fladen på de re-5 spektive varmevekslercellers 14, 15 mod indløbsde lens 6 vendte side mellem hjørnekanterne 18 og 25. Hver af varmevekslerpladerne 31, 32 er svingbart lejret omkring en på pladerne 9 vinkelret beliggende svingningsaksel 33 ved den nærmest huset 24's øver-10 ste væg 22 beliggende hjørnekant 18. Herigennem kan opnås særdeles gode indstrømningsforhold selv ved begrænset åbning af de pågældende varmevekslerspjæld o gennem svingning opad gennem ca. 30-45 fra lukket stilling (jf. fig. 1).35 In order to close the inlet air or outdoor air flow passages 29 6 DK 168773 B1 (corresponding flow passages 30 for the outlet air or exhaust air F are constantly kept open), plate-shaped heat exchanger dampers 31, 32 are dimensioned to cover the entire surface of the respective 5 14, 15 facing the inlet liner 6 facing the corner edges 18 and 25. Each of the heat exchanger plates 31, 32 is pivotally mounted around a pivot shaft 33 perpendicular to the plates 9 at the corner edge 18. extremely good inflow conditions are obtained even with limited opening of the heat exchanger in question o through oscillation upwards through approx. 30-45 from the closed position (cf. Fig. 1).

15 Til hvert af varmevekslerspjældene 31 og 32 er tilsluttet en i det væsentlige cirkelsektorformet by-pass-spjældplade 34 henholdsvis 35 (se fig. 3 og 4), som er forenet med varmevekslerspjældpladen 31, 32's nærmest by-pass-kanalen 16 liggende kantparti 20 og strækker sig vinkelret fra dette indad mod det indre af by-pass-kanalen 16 i et med varmevekslerpladerne 9 parallelt plan. By-pass-spjældpladen 34 og 35 strækker sig således fra spjældindretningens svingningsaksel 33 ved hjørnekanten 18 til den modståen-25 de hjørnekant 25 og er i sin helhed skudt ind i by-pass-kanalen 16, når det tilhørende varmevekslerspjæld 31 og 32 er lukket. Ved åbning af sidstnævnte ' udtrækkes by-pass-spjældpladen 34, 35 som et skydespjæld og lukker derved en indløbsåbning 36, 37 30 til en indløbspassage 38 til by-pass-kanalen 16, hvilken indløbspassage 38 afgrænses på indløbssiden af et båndformet vægparti 39 beliggende i by-pass-kanalen 16's forlængelse på indløbssiden. Vægpartiet 39 består af et første, lige båndparti 39a, som ud-35 går fra varmevekselercellernes 14, 15 fælles hjørne- kantlinie 18 (ved vægpartiet 17), og strækker sig 7 DK 168773 B1 skråt udad noget forbi den halve afstand mellem hjør-nekantlinierne 18 og 25 under en vinkel på fortrinsvis 20-30 i forhold til varmevekslercellernes indløbsflade (planet mellem hjørnekantlinierne 28 5 og 25), og et dertil fortrinsvis under en stump vinkel tilsluttende, andet lige båndparti 39b, som slutter sig til den modstående hjørnekantlinie 25 (ved vægpartiet 17). De to indløbsåbninger 36, 37 af-grænses således af respektive kanter i vægpartiet 39 10 samt den nærmest dette vægparti beliggende kant 40 respektive 41 i varmevekslercellerne 15 og 14 (se fig. 2).To each of the heat exchanger dampers 31 and 32 is connected a substantially circular sector-shaped by-pass damper plate 34 and 35, respectively (see Figures 3 and 4), which is joined to the edge portion 20 of the heat exchanger damper plate 31, 32 which is closest to the by-pass channel 16. and extending perpendicularly thereto inwardly toward the interior of the by-pass channel 16 in a plane parallel to the heat exchanger plates 9. The by-pass damper plate 34 and 35 thus extend from the pivot shaft 33 of the damper device at corner edge 18 to the opposing corner edge 25 and are fully inserted into the by-pass channel 16 when the associated heat exchanger 31 and 32 are closed. . Upon opening the latter, the by-pass damper plate 34, 35 is pulled out as a slider, thereby closing an inlet opening 36, 37 30 to an inlet passage 38 of the by-pass channel 16, said inlet passage 38 being delimited on the inlet side of a band-shaped wall portion 39 located in the by-pass channel 16 on the inlet side extension. The wall portion 39 consists of a first straight strip portion 39a extending from the common corner edge line 18 of the heat exchanger cells 14 (at the wall portion 17), and extends obliquely outward slightly beyond the half-distance between the corner-edge lines. 18 and 25 at an angle of preferably 20-30 with respect to the inlet surface of the heat exchanger cells (the plane between corner edge lines 28 5 and 25), and a second straight strip portion 39b thereof adjacent at a blunt angle, joining the opposite corner edge line 25 ( at the wall portion 17). Thus, the two inlet openings 36, 37 are bounded by respective edges of the wall portion 39 10 as well as the edge 40 and 41 adjacent to this wall portion respectively of the heat exchanger cells 15 and 14 (see Fig. 2).

Varmevekslerspjældene 31, 32 med tilhørende by-pass-spjældplade 34 og 35 manøvreres hver for 15 sig ved hjælp af hver sin elektriske stillemotor 42 og 43, som i det viste udførelseseksempel er fastgjort på ydersiden af hver sin varmevekslerspjældplade 31, 32 og er koblet til det faste, mellemliggende vægparti 39 ved hjælp af en med to eller flere lænke-20 led forsynet lænkeledsforbindelse 44 respektive 45. Varmevekslerspjældene 31, 32 kan således åbnes og lukkes uafhængigt af hinanden, hvorved tilhørende by-pass-spjældplader 34, 35 samtidig lukker respektive åbner den tilhørende indløbsåbning 36, 37 til by- 25 pass-kanalen 16. Arealerne af de respektive indløbsåbninger 36 og 37, og by-pass-kanalen 16's tværsnitsareal er dimensioneret således, at indløbsluftens trykfald i det væsentlige er det samme uanset om indløbsluften passerer gennem en varmevekslercelle 14, 30 15 (med åbent varmevekslerspjæld og lukket by-pass-spjæld) eller via tilhørende indløbsåbninger 36, 37 og gennem by-pass-kanalen 16 (med lukket varmevekslerspjæld og åbent by-pass-spjæld). Herigennem kan det totale trykfald og således indløbsluftstrømmen gennem 35 varmeveksleren 1 holdes i det væsentlige konstant og uafhængig af spjældenes indstilling.The heat exchanger dampers 31, 32 with associated by-pass damper plate 34 and 35 are individually actuated by means of each of their electric actuators 42 and 43, which in the illustrated example are attached to the exterior of each of the heat exchanger damper plates 31, 32 and are connected to the fixed intermediate wall portion 39 by means of a link link 44 and 45 respectively provided with two or more link members. Thus, the heat exchanger dampers 31, 32 can be opened and closed independently of each other, whereby corresponding by-pass damper plates 34, 35 simultaneously close respectively. the associated inlet opening 36, 37 opens to the by-pass duct 16. The areas of the respective inlet openings 36 and 37 and the cross-sectional area of the by-pass duct 16 are dimensioned such that the pressure drop of the inlet air is substantially the same regardless of whether the inlet air passes through a heat exchanger cell 14, 30 15 (with open heat exchanger damper and closed by-pass damper) or via associated inlet openings 36, 37 and through the by-pass duct 16 (with a closed heat exchanger dampers and open by-pass damper). Hereby, the total pressure drop and thus the inlet air flow through the heat exchanger 1 can be kept substantially constant and independent of the setting of the dampers.

8 DK 168773 B18 DK 168773 B1

Det beskrevne anlæg arbejder fortrinsvis på følgende måde:The described plant preferably works as follows:

Ved såkaldt sommerdrift, dvs. når udelufttempe-raturføleren 8 føler en relativ høj temperatur, 5 f.eks. overstigende +15°C, holdes begge varmevekslerspjæld 31, 32 lukkede, som vist i fig. 2, således at al indløbsluft eller udeluft U passerer gennem by-pass-kanalen 16 via de frilagte indløbsåbninger 36, 37. Ved lavere temperaturer, såkaldt vinterdrift, dvs.In so-called summer operation, ie. when the outdoor temperature sensor 8 senses a relatively high temperature, 5 e.g. exceeding + 15 ° C, both heat exchanger dampers 31, 32 are kept closed, as shown in FIG. 2, so that all inlet air or outdoor air U passes through the by-pass duct 16 via the exposed inlet openings 36, 37. At lower temperatures, so-called winter operation, ie.

10 når udelufttemperaturføleren 8 føler en temperatur indenfor et forudbestemt, relativt lavere, fortrinsvis indstilleligt temperaturinterval, f.eks. mellem +15°C 0 og -10, C, holdes begge varmevekslerspjæld 31, 32 åb ne som vist i fig. 1 og 3, således at al indløbsluft 15 eller udeluft U passerer gennem varmevekslercellerne 14, 15's gennemstrømningskanaler 29. Herved opnås en relativ god temperaturvirkningsgrad på i det mindste 50%, hvor det resterende varmeeffektbehov dækkes af luftvarmeren 11.10 when the outdoor air temperature sensor 8 senses a temperature within a predetermined, relatively lower, preferably adjustable temperature range, e.g. between + 15 ° C 0 and -10, C, both heat exchanger dampers 31, 32 are kept open as shown in FIG. 1 and 3, so that all inlet air 15 or outdoor air U passes through the heat exchanger cells 14, 15 through which a relatively good temperature efficiency of at least 50% is obtained, with the remaining heat power requirement being covered by the air heater 11.

20 Ved endnu lavere udelufttemperaturer (såkaldt afrimningsdrift), dvs. når føleren 8 føler en ude-lufttemperatur, der ligger under en forudbestemt, forholdsvis lav, fortrinsvis indstillelig temperatur på 0 f.eks. -10 C, manøvreres varmevekslerspjældene 31, 32 25 intermitterende til skiftevis åben og lukket stilling, således at varmevekslerspjældet (f.eks. 31) til den ene varmevekslercelle 15 holdes lukket i en forudbestemt tidsperiode, hvorved denne varmevekslercelle afrimes af den gennem cellen strømmende, varme afkast-30 luft, og udeluften fordeles mellem de andre varmevekslerceller 14 og by-pass-kanalen 16, medens varmevekslerspjældet 32 for den anden varmevekslercelle 14 holdes lukket under en efterfølgende tidsperiode, således at denne anden varmevekslercelle afrimes. Her-35 ved opnås en lavere temperaturvirkningsgrad på ca. 25%, hvor luftvarmeren 11 tilfører den resterende varmeef-fekt.20 At even lower outdoor temperatures (so-called defrost operation), ie. when the sensor 8 senses an outdoor air temperature below a predetermined, relatively low, preferably adjustable temperature of 0, e.g. -10 C, the heat exchanger dampers 31, 32 are operated intermittently to alternately open and closed position so that the heat exchanger damper (e.g. 31) of one heat exchanger cell 15 is kept closed for a predetermined period of time, whereby this heat exchanger cell is defrosted by the flowing through the cell. heat exhaust air 30 and the outside air is distributed between the other heat exchanger cells 14 and the by-pass duct 16, while the heat exchanger damper 32 of the second heat exchanger cell 14 is kept closed for a subsequent period of time so that this second heat exchanger cell is defrosted. Hereby a lower temperature efficiency of approx. 25%, with the air heater 11 supplying the remaining heat power.

9 DK 168773 B19 DK 168773 B1

Omstillingen mellem de forskellige driftsformer foretages ved hjælp af ikke viste elektriske styreorganer, der er tilsluttet temperatur følerne 8 og 13 samt elektromotorerne 42 og 43.The switching between the different operating modes is carried out by means of electric control means (not shown) connected to the temperature sensors 8 and 13 as well as the electric motors 42 and 43.

5 Det beskrevne anlæg kan modificeres indenfor pa tentkravenes område. Eventuelt kan blot én varmevekslercelle med hosliggende by-pass-kanal indrettes, eller der kan være tre eller flere varmevekslerceller, der hver har en tilhørende by-pass-kanal, som eventuelt kan 10 være fælles for to hosliggende, adskilte varmevekslerceller .5 The plant described can be modified within the area of the tent requirements. Optionally, only one heat exchanger cell with adjacent by-pass channel may be arranged, or there may be three or more heat exchanger cells, each having an associated by-pass channel, which may be common to two adjacent separate heat exchanger cells.

Yderligere kan manøvreringen af spjældindretningerne foretages på en anden måde, f.eks. med hver sin stillemotor indrettet på et vægpartierne 20, 27 15 eller 39, eller virkende på svingakslen. Det vægparti 39, som afgrænser by-pass-kanalen 16' s indløbspassage 38 med indløbsåbninger 36, 37 kan også udformes på en anden måde end den viste.Further, the actuation of the damper devices can be performed in another way, e.g. each having a still motor arranged on a wall portions 20, 27 or 39, or acting on the pivot shaft. The wall portion 39 defining the by-pass channel 16's inlet passage 38 with inlet openings 36, 37 may also be configured in a different manner from that shown.

I stedet for at placere spjældene 31, 34 re- 20 spektive 32, 35 og by-pass-kanalen 16's passage 38 på indløbssiden kan disse spjæld og en tilsvarende udløbspassage med udløbsåbninger indrettes på varmevekslerens udløbsside ved udløbsdelen 10.Instead of placing the dampers 31, 34 and 32, 35 and by-pass passage 16 of the by-pass channel 16 on the inlet side, these dampers and a corresponding outlet passage with outlet openings can be arranged on the outlet side of the heat exchanger at the outlet part 10.

Endelig er det muligt under visse driftsbetin-25 gelser at styre hver af elektromotorerne 42 og 4 3 på en sådan måde, at de tilhørende varmevekslerspjæld 31 og 32 åbnes med en lille åbningsvinkel, således at tilhørende by-pass-spjældplader 34 og 35 blot lukker en del af indløbsåbningerne 36 og 37 til by-30 pass-kanalen 16. Herigennem mindskes varmegenvindings-graden i den tilhørende varmevekslercelle 15 respektive 14, hvilket kan være hensigtsmæssigt ved ude-lufttemperaturer, der ligger noget under normal rumtemperatur eller ved moderate vintertemperaturer, f.eks.Finally, under certain operating conditions, it is possible to control each of the electric motors 42 and 43 in such a way that the associated heat exchanger dampers 31 and 32 are opened at a small opening angle, so that the corresponding by-pass damper plates 34 and 35 simply close a portion of the inlet openings 36 and 37 to the by-pass duct 16. This reduces the heat recovery rate in the associated heat exchanger cell 15 and 14, respectively, which may be convenient at outdoor temperatures somewhat below normal room temperature or at moderate winter temperatures, e.g. .g.

0 35 omkring -10 C, hvor der foreligger en vis risiko for isdannelse på varmevekslerpladerne.0 35 around -10 C, where there is a certain risk of ice formation on the heat exchanger plates.

Claims (10)

10 DK 168773 B1DK 168773 B1 1. Ventilationsanlæg med pladevarmeveksler (1) af krydsstrømstypen omfattende - mindst én varmevekslercelle (14,15) med flere indbyrdes, i det væsentlige parallelle plader (9), som mellem sig danner hosliggende, ind- 5 byrdes krydsende gennemstrømningskanaler (29, 30. for indløbsluft, som normalt udgøres af relativ kold udeluft (U), respektive udløbsluft, som normalt udgøres af relativ varm afgangsluft (F), 10. en til varmevekslercellen (14,15) stødende by-pass-kanal (16) til gennemstrømning af indløbsluft (U) forbi varmevekslercellen under visse driftsbetingelser, - et svingbart lejret varmevekslerspjæld (31,32) 15 som i åben stilling frilægger gennemstrøm ningskanalerne (29) for indløbsluft (U) og i lukket stilling aflukker disse, og - et med varmevekslerspjældet (31,32) stift forbundet by-pass-spjæld (34,35), som i åben 20 stilling af varmevekslerspjældet i det mindste delvis aflukker by-pass-kanalen (16) og i lukket stilling af varmevekslerspjældet frilægger denne, kendetegnet ved, 25. at varmevekslerspjældet (31,32) er lejret om en vinkelret på nævnte plader (9) orienteret svingaksel (33) ved en hjørnekant (18) af varmevekslercellen , - at by-pass-kanalen (16) slutter an mod en ind- 30 løbs- eller udløbspassage (38) med henholdsvis en indløbs- eller udløbsåbning (36,37) beliggende i et plan orienteret parallelt med nævnte plader (9), og 11 DK 168773 B1 - at by-pass-spjældet (34,35) udgøres af et vinkelret på varmevekslerspjældet beliggende og med et kantparti af dette forenet spjæld eller en spjældplade (34,35), som under svingning af 5 varmevekslerspjældet (31,32) virker som skyde- spjæld i forhold til nævnte indløbs- og'udløbsåbninger for by-pass-kanalen.A cross-flow type heat exchanger ventilation system (1) comprising - at least one heat exchanger cell (14,15) having several mutually substantially parallel plates (9) forming interconnected intersecting flow channels (29, 30). for inlet air normally constituted by relatively cold outdoor air (U), respectively, outlet air usually formed by relatively hot exhaust air (F), 10. a by-pass duct adjacent to the heat exchanger cell (14,15) for flowing through inlet air (U) past the heat exchanger cell under certain operating conditions, - a pivotally mounted heat exchanger damper (31,32) 15 which in open position exposes the flow ducts (29) to inlet air (U) and in closed position closes these (1) , 32) rigidly connected by-pass damper (34,35) which in the open position of the heat exchanger damper at least partially closes the by-pass duct (16) and in closed position of the heat exchanger damper discloses this, characterized in that 25. the heat exchanger damper (31,32) is mounted about a perpendicular to said plates (9) oriented pivot shaft (33) at a corner edge (18) of the heat exchanger cell, - that the by-pass channel (16) terminates against an inlet or outlet passage (38) having an inlet or outlet opening (36, 37), respectively, located in a plane oriented parallel to said plates (9), and bypass-by-pass. the damper (34,35) consists of a perpendicular to the heat exchanger damper located and having an edge portion of this united damper or a damper plate (34,35) which, during oscillation of the heat exchanger damper (31,32) acts as a fire damper with respect to said inlet and outlet openings for the by-pass channel. 2. Ventilationsanlæg ifølge krav 1, og hvor der er mindst to varmevekslerceller. (14,15), der 10 hver er indrettet på sin side af en fælles by-pass-kanal (16), kendetegnet ved, at nævnte indløbs- eller udløbspassage (38) til by-pass-kanalen i det mindste delvis afgrænses af et båndformet vægparti (39) beliggende i by-pass-kanalens (16) forlængelse, 15 og hvor kantpartierne af nævnte båndformede vægparti udgør begrænsningskanter af to indløbs- henholdsvis udløbsåbninger (36,37) for by-pass-kanalen (16) hørende til hver sin varmevekslercelle (15,14).Ventilation system according to claim 1, wherein there are at least two heat exchanger cells. (14,15), each arranged on its side by a common by-pass channel (16), characterized in that said inlet or outlet passage (38) of the by-pass channel is at least partially delimited by a band-shaped wall portion (39) located in the extension of the by-pass channel (16), and the edge portions of said band-shaped wall portion constituting restriction edges of two inlet and outlet openings (36, 37) of the by-pass channel (16) respectively. each heat exchanger cell (15,14). 3. Ventilationsanlæg ifølge krav 2, kende-20 t e g n e t ved, at nævnte båndformede vægparti (39) strækker sig fra en hjørnekant (18), som ligger på linie med nævnte hjørnekant (18) i hver varmevekslercelle (14,15), til en modstående hjørnekant (25).Ventilation system according to claim 2, characterized in that said band-shaped wall portion (39) extends from a corner edge (18) which is aligned with said corner edge (18) in each heat exchanger cell (14,15). opposite corner edge (25). 4. Ventilationsanlæg ifølge krav 3, kende-25 t e g n e t ved, at nævnte vægparti (39) omfatter to retlinede båndpartier (39a,39b), som danner en stump vinkel med hinanden.Ventilation system according to claim 3, characterized in that said wall portion (39) comprises two rectilinear strip portions (39a, 39b) which form a blunt angle with one another. 5. Ventilationsanlæg ifølge ethvert af de foregående krav, kendetegnet ved, at hvert var- 30 mevekslerspjæld (31,32) og den med dette forenede by-pass-spjældplade (34,35) er manøvrerbart ved hjælp af en elektromotor (42,43), som påvirker en lænkeledsforbindelse (44,45) mellem varmevekslerspjældet (31,32) og et med varmevekslercellen fast forbundet vægparti (39).Ventilation system according to any one of the preceding claims, characterized in that each heat exchanger damper (31,32) and the associated by-pass damper plate (34,35) are maneuverable by means of an electric motor (42,43 ) which affects a link joint connection (44,45) between the heat exchanger damper (31,32) and a wall portion (39) fixed to the heat exchanger cell. 6. Ventilationsanlæg ifølge krav 5 i kombination med ethvert af kravene 2-4, kendetegnet ved, 12 DK 168773 B1 at en til hver sin varmevekslercelle (14,15) hørende elektromotor (43,42) er monteret på det tilhørende varmevekslerspjæld (32,31), og at lænkeledsforbindelsen (45,44) er forbundet med nævnte båndformede vægparti 5 (39).Ventilation system according to claim 5 in combination with any of claims 2-4, characterized in that an electric motor (43,42) belonging to each heat exchanger cell (14,15) is mounted on the associated heat exchanger valve (32, 31) and the link joint (45, 44) is connected to said band-shaped wall portion 5 (39). 7. Ventilationsanlæg ifølge ethvert af de foregående krav, kendetegnet ved, at hver by-pass-spjældplade (34,35) udgår fra et kantparti af varmevekslerspjældet (31,32) og strækker sig indad mod 10 det indre af by-pass-kanalen (16).Ventilation system according to any one of the preceding claims, characterized in that each by-pass damper plate (34,35) proceeds from an edge portion of the heat exchanger damper (31,32) and extends inwards towards the interior of the by-pass duct. (16). 8. Ventilationsanlæg ifølge krav 7, kendetegnet ved, at by-pass-spjældpladen (34,35) i det væsentlige har form af en cirkelsektor med cirklens centrum beliggende i linien, der dannes af varmeveks- 15 lerspjældets svingningsaksel (33).Ventilation system according to claim 7, characterized in that the by-pass damper plate (34,35) is essentially in the form of a circle sector with the center of the circle located in the line formed by the pivot shaft of the heat exchanger (33). 9. Ventilationsanlæg ifølge ethvert af de foregående krav og hvor pladevarmevekselen (1) er monteret i et kasseformet hus (24) med diametralt modstående hjørnekanter (18,19) i hver varmevekslercelle (14,15) 20 fikseret ved to modstående, især øvre og nedre husvægge (22,23), kendetegnet ved, at svingningsakslen (33) for hvert varmevekslerspjæld (31,32) er beliggende i nærheden af den ene (22) af nævnte modstående husvægge.Ventilation system according to any one of the preceding claims and wherein the plate heat exchanger (1) is mounted in a box-shaped housing (24) with diametrically opposed corner edges (18,19) in each heat exchanger cell (14,15) 20 fixed by two opposites, especially upper and lower. lower housing walls (22,23), characterized in that the pivot shaft (33) for each heat exchanger damper (31,32) is located near one (22) of said opposite housing walls. 10. Ventilationsanlæg ifølge ethvert af de fore gående krav, hvor pladevarmeveksleren omfatter mindst to varmevekslerceller (14,15), og hvor en temperaturføler (8) er indrettet på indløbssiden af varmevekslercellerne (14,15) til afføling af indløbsluftens tem- 30 peratur og indstilling af nævnte varmevekslerspjæld (31,32) og tilhørende by-pass-spjæld (34,35) ved hjælp af elektriske og mekaniske styreorganer (42,43), kendetegnet ved, at styreorganet er indrettet til 35. ved detektering af en indløbslufttemperatur, der overstiger en forudbestemt, forholdsvis 13 DK 168773 B1 høj, fortrinsvis indstillelig temperatur, 0 f.eks. +15 C, at lukke alle varmevekslerspjæld (31,32), så at al indløbsluft passerer gennem nævnte by-pass-kanal (16) eller -kanaler og 5 tilhørende indløbs- respektive udløbsåbninger (36,37), - ved detektering af en indløbsluftstemperatur beliggende i et forudbestemt, forholdsvis stort, fortrinsvis indstilleligt temperatur- 0 0 10 interval, f.eks. mellem +15 C og -10 C, at åb ne alle varmevekslerspjæld (31,32), så at hele indløbsluftstrømmen løber gennem varmevekslercellerne (14,15), medens by-pass-spjældplader-ne (34,35) aflukker indløbs- respektive ud-15 løbsåbningerne (36,37) til nævnte by-pass- kanal (16) eller -kanaler, og - ved detektering af en indløbslufttemperatur beliggende under en forudbestemt, forholdsvis lav, fortrinvis indstillelig temperatur, 0 20 f.eks. -10 C, intermitterende og skiftevis at lukke respektive varmevekslerspjæld (31,32) til modvirkning eller eliminering af isdannelse på nævnte plader (9), og hvor den til hvert lukket varmevekslerspjæld hørende by-pass-25 spjældplade (34,35) fritlægger tilhørende indløbs- respektive udløbsåbning (36,37) til den pågældende by-pass-kanal (16), således at den totale indløbsluftstrøm holdes i det væsentlige konstant.Ventilation system according to any preceding claim, wherein the plate heat exchanger comprises at least two heat exchanger cells (14,15) and wherein a temperature sensor (8) is arranged on the inlet side of the heat exchanger cells (14,15) for sensing the inlet air temperature and adjusting said heat exchanger damper (31,32) and associated by-pass damper (34,35) by means of electrical and mechanical control means (42,43), characterized in that the control means is adapted to 35. by detecting an inlet air temperature, exceeding a predetermined, relatively high, preferably adjustable temperature, 0 e.g. +15 C, to close all heat exchanger dampers (31,32) so that all inlet air passes through said by-pass duct (16) or ducts and 5 associated inlet and outlet openings (36,37), respectively - by detecting a inlet air temperature located in a predetermined, relatively large, preferably adjustable temperature range, e.g. between +15 C and -10 C, to open all heat exchanger dampers (31,32) so that the entire inlet air flow passes through the heat exchanger cells (14,15), while the by-pass damper plates (34,35) shut off the inlet and exhaust valves respectively. the outlet openings (36, 37) for said by-pass duct (16) or ducts, and - by detecting an inlet air temperature located below a predetermined, relatively low, preferably adjustable temperature, 0 20 e.g. -10 C, intermittently and alternately closing respective heat exchanger dampers (31,32) for counteracting or eliminating ice formation on said plates (9), and wherein the by-pass damper plate (34,35) of each closed heat exchanger belongs to inlet and outlet port (36, 37) of the respective by-pass duct (16), so that the total inlet air flow is kept substantially constant.
DK025291A 1990-02-23 1991-02-14 Ventilation system with cross-flow type heat exchanger DK168773B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9000665 1990-02-23
SE9000665A SE463944B (en) 1990-02-23 1990-02-23 Register arrangement for plate heat exchanger with a shunt duct

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DK25291D0 DK25291D0 (en) 1991-02-14
DK25291A DK25291A (en) 1991-08-24
DK168773B1 true DK168773B1 (en) 1994-06-06

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FI (1) FI92431C (en)
NO (1) NO173843C (en)
SE (1) SE463944B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO310321B1 (en) * 1999-09-20 2001-06-18 Villavent As A method for defrosting a counter-current type heat exchanger and assembly comprising a heat exchanger in the form of such a counter-current heat exchanger
SE536208E (en) 2011-07-15 2017-03-07 Iv Produkt Ab Air treatment system and ways to control the defrosting of this
GB2513095B (en) * 2013-02-15 2018-01-31 Nuaire Ltd A heat exchanger device for use in a ventilation unit

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NO173843C (en) 1994-02-09
FI92431B (en) 1994-07-29
DK25291A (en) 1991-08-24
SE9000665D0 (en) 1990-02-23
NO910691L (en) 1991-08-26
DK25291D0 (en) 1991-02-14
NO910691D0 (en) 1991-02-21
FI910840A (en) 1991-08-24
SE463944B (en) 1991-02-11
NO173843B (en) 1993-11-01
FI92431C (en) 1994-11-10
FI910840A0 (en) 1991-02-21

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