EP2668875B1 - Modul, Vorrichtung und Verfahren zur Bereitstellung eines Flüssigkeitvorhangs - Google Patents

Modul, Vorrichtung und Verfahren zur Bereitstellung eines Flüssigkeitvorhangs Download PDF

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Publication number
EP2668875B1
EP2668875B1 EP13169365.7A EP13169365A EP2668875B1 EP 2668875 B1 EP2668875 B1 EP 2668875B1 EP 13169365 A EP13169365 A EP 13169365A EP 2668875 B1 EP2668875 B1 EP 2668875B1
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EP
European Patent Office
Prior art keywords
flow
honeycomb structure
fluid
curtain
module
Prior art date
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Application number
EP13169365.7A
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English (en)
French (fr)
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EP2668875A1 (de
EP2668875B8 (de
Inventor
Tomi SIPILÄ
Kimmo Heinävaara
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.)
Viessmann Refrigeration Systems Oy
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Norpe
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Priority to PL13169365T priority Critical patent/PL2668875T3/pl
Publication of EP2668875A1 publication Critical patent/EP2668875A1/de
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Publication of EP2668875B8 publication Critical patent/EP2668875B8/de
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type
    • A47F3/0443—Cases or cabinets of the open type with forced air circulation
    • A47F3/0447—Cases or cabinets of the open type with forced air circulation with air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains

Definitions

  • the invention relates to a module, method and arrangement for providing a fluid curtain, such as an air curtain, between different environments, such as between two spaces with different temperatures and/or concentrations.
  • a fluid curtain such as an air curtain
  • Devices with fluid curtains separating two different environments having common opening interface but different conditions, such as temperature or concentration, are previously known for example in technical fields of refrigeration apparatuses but also a clean work area.
  • the separation barrier is needed to minimize the mixing of different conditions with each other, such as temperature, different types of particles like microbes, concentration or the like.
  • entrained ambient air into the cold air curtain in the refrigeration apparatuses is the largest thermal load of a multi-deck type or "vertical" refrigerated display case and according to some estimates 75% of the refrigeration load comes from the air curtain entrainment.
  • different types of air curtains are also used in laminar air flow work stations, such as is described in US 4,927,438 A .
  • the patent publication US 7,162,882 B2 discloses a multi-band air curtain forming a separation barrier at an interface between a first environment having a fluid at a first condition and a second environment having a fluid at a second condition.
  • a first stream (55) of a fluid is directed along a first path generally parallel to the interface between the first environment and the second environment.
  • a second stream (65) of fluid is directed along a second path generally outwardly at an angle of divergence with the first path.
  • a third stream (85) of a fluid is directed along a third path between the first path and the second path.
  • a refrigerated merchandiser (10) is also disclosed having a display case having an interior defining a product display region (30) having an open front and first (34), second (70) and third (68) air outlets for directing air streams across the open front of the refrigerated merchandiser.
  • honeycomb structure is disclosed by JP S61 46384 U for providing an air curtain, where the flow or velocity profile is achieved by the honeycomb structure with conduits of different cross sectional areas.
  • Another honeycomb structure is disclosed by JP 2000 102458 A to utilize conduits with different cross sectional areas and thereby providing a refrigerated display case with a multi-band air curtain.
  • US 2003/159451 A1 discloses a refrigeration system, where environmental data is obtained and used for controlling the speed of fans to generate an air curtain.
  • the fans are arranged side by side in the width direction of the curtain.
  • JP S54 134861 discloses a refrigerating system with a straight and inclined deflecting wall for providing an air curtain. Also JP 2000 102458 A discloses a deflector, which is a convex-shaped.
  • An object of the invention is to alleviate and eliminate the problems relating to the known prior art.
  • Especially the object of the invention is to provide a method and module for providing a fluid curtain between different environments such as environments with different temperatures, contents and/or concentrations, like bacterial content, so that the entrainment of the ambient fluid into the fluid curtain is minimized.
  • the invention relates to a module according to claim 1.
  • the invention relates to an arrangement of claim 5, and method of claim 6.
  • a fluid curtain such as an air curtain, between different environments is provided via a honeycomb structure comprising plurality of parallel conduits.
  • the conduits are configured to laminarize the flow for the fluid curtain, and to guide the flow and suppressing instabilities in the flow downstream of it.
  • the suppressing of instabilities is performed at least in perpendicular direction to walls of said conduits.
  • the Reynolds number of flow when flowing out from the honeycomb structure is advantageously below 6000, more advantageously below 5000 and most advantageously around 1000.
  • these ranges or values are only examples and that the invention is not limited only to those.
  • the velocity profile of the flow before the honeycomb structure or during the honeycomb structure is changed so that the velocity profile of the flow after the honeycomb structure is a (advantageously smooth) skewed parabolic velocity profile with a peak shifted from the centre line of the symmetrical parabolic velocity profile.
  • the peak is shifted towards the first environment, such as towards inside of the refrigerated display case.
  • the invention offers clear advantages over the known prior art, when the inventors have noticed that the shape of vertical velocity profile and the turbulence intensity present at the outlet nozzle will remarkably control the fluid curtain entrainment rate.
  • the relative velocity and change of relative velocity in the transition layer with the second environment fluid such as warm ambient air
  • the transition layer with the second environment fluid is small, which keeps the transition layer with the second environment fluid as laminar as possible thereby minimizing entrainment of the ambient fluid into the fluid curtain.
  • the thermal or particle load of the systems and thereby the refrigeration or cleaning costs of the display case can be remarkable reduced.
  • entrainment is used in this document for example to the purpose of to transfer air or other fluid (or even particles) into an organized fluid current (such as an air curtain) from the surrounding atmosphere.
  • Figure 1 illustrates a prior art device for providing air curtains described in US 7,162,882 B2 .
  • Figure 1 is already handled in connection with the background of the invention chapter above.
  • the module and inventive concept of the present invention can also be implemented with similar devices as described in Figure 1 , where the air curtain providing means can be replaced for example by the module of the invention described in Figure 2 or with the means of said module, such as an appropriate mechanical structure before the outlet for the air curtain, where said mechanical structure is configured to change the velocity profile of the flow before the honeycomb structure or during the honeycomb structure so that the velocity profile of the flow after the honeycomb structure or outlet is a smooth skewed parabolic velocity profile with a peak shifted from the centre line of the symmetrical parabolic velocity profile.
  • FIG. 2 illustrates an exemplary module 100 for providing a fluid curtain, and especially an air curtain 101 between different environments (Environment I, Environment II) according to an advantageous embodiment of the invention, where the module comprises a flow channel 102.
  • the module 100 comprises an inlet 103 for introducing an air flow through the flow channel of the module and an outlet 104 for outputting said air curtain.
  • the module 100 comprises a honeycomb structure 105 before the outlet in order to laminarize the flow for the air curtain.
  • the honeycomb structure comprises plurality of parallel conduits 106 for guiding the flow and suppressing instabilities in the flow downstream of it and at least in perpendicular direction to walls of said conduits 106.
  • the module 100 comprises a mechanical structure 105, 107 before the outlet 104, which is configured to change the velocity profile of the flow 101 before 107 the honeycomb structure or during 105 the honeycomb structure so that the velocity profile of the flow after the honeycomb structure 105 or outlet 104 is a smooth skewed parabolic velocity profile with a peak 108 shifted from the centre line 109 of the symmetrical parabolic velocity profile or the centre line 109 of the honeycomb structure 105.
  • the mechanical structure before the outlet is a deflector 107, such as an S-shaped (described in Figure 2 ) .
  • the deflector 107 is configured to guide the air flow 110 from the inlet 103 to the honeycomb structure 105 so that greater dynamic pressure and thereby the greater fluid velocity is introduced to the distance from the centre line 109 of the honeycomb structure, and most advantageously so that the greater dynamic pressure and thereby greater fluid velocity is introduced to the point before the centre line 109 of the honeycomb structure in the direction of the inlet flow 103.
  • the form of the deflector 107 in the downstream direction 110 of the inlet flow is convergent, advantageously continuously convergent, and most advantageously continuously but nonlinearly convergent towards the honeycomb structure 105. Due to the rounded shapes and smooth surface of the deflector 107 it does not significantly generate turbulence in flow upstream of the honeycomb structure 105, In addition the honeycomb structure 105 itself is a very effective device to suppress the fluid curtain instabilities immediately downstream of it.
  • the first curve 107a of the S-shaped deflector 107 or the peak or apex of the convex-shaped deflector (not shown) is configured to protrude towards the honeycomb structure 105 is located in the downstream direction of the inlet flow 110 before the centre line 109 of the honeycomb structure 105.
  • the second curve 107b of the S-shaped deflector 107 is configured to protrude into the opposite direction than the first curve, and is located in the downstream direction of the inlet flow 110 after the centre line 109 of the honeycomb structure 105.
  • the greater dynamic pressure and thereby the greater fluid velocity can be introduced to the point before the centre line 109 of the honeycomb structure in the direction of the inlet flow 103, and thereby the smooth skewed parabolic velocity profile with a peak 108 shifted from the centre line 109 of the symmetrical parabolic velocity profile or the centre line 109 of the honeycomb structure 105 can be achieved, as is described in Figure 2 .
  • FIG 3 illustrates an exemplary arrangement 200, such as a refrigerated display case, for providing fluid curtain according to an advantageous embodiment of the invention.
  • the device may comprise a display space 201, an access opening 202 in the front of said display space, and a flow curtain providing means 100 for establishing the flow curtain 101 across the access opening 202.
  • the inventive concept namely the module 100 or the means and features 101-110 of the module described e.g. in Figure 2 can be utilized also in other devices separating at least two different environments with the fluid curtain, such as laminar air flow work stations.
  • the refrigerated display case 200 described in Figure 3 comprises only one means for producing the fluid curtain, such as only one channel 102, and therefore only one fluid curtain 101.
  • the device 200 comprises a fluid suction means or portion 203 located adjacent the lower edge of the access opening 202, an air duct 204 communicating with said fluid suction means or portion 203 having a fluid discharge outlet 205 near the upper edge of the access opening 202.
  • the deflector 107 and the honeycomb structure 105, 106 described e.g. in connection with Figure 2 can be implemented in connection with the fluid discharge opening 205 to provide the fluid curtain 101.
  • the deflector 107 and the honeycomb structure 105, 106 described e.g. in connection with Figure 2 can also be implemented into the device described in Figures 1 or 3 as a module described e.g. in connection with Figure 2 .
  • the device 200 advantageously comprises circulating means 206 for circulating fluid through said fluid duct 204, 205 and again through the deflector 107 and the honeycomb structure 105, 106, as well as through the refrigeration means 207 for example for refrigerating the fluid for the fluid curtain 101.
  • the device 200 described in Figure 3 is a recirculated type refrigerated display case, since it comprises the fluid suction means or portion 203 for collecting the chilled fluid of the fluid curtain 101 and recirculating it again.
  • the inventive concept and embodiments of the present invention can also be implemented in connection with non-recirculated type devices, such as is described in Figure 1 , where the refrigerated display case comprises also one or more fans 72 or the like to draw ambient air from the environment exterior of the refrigerator 10 through the fluid duct 74 to the second air discharge outlet 70.
  • the flow curtain 101 is created by forcing chilled flow in the duct 205 at the top of the display case 200 into the deflector 107, such as S-shaped deflector.
  • the deflector 107 turns the chilled fluid flow 110 downward through the honeycomb structure 105 and thereby produces a smooth skewed parabolic velocity profile with peak shifted towards the inside of the display case 200 having low temperature (Environment I) compared to the ambient temperature (Environment II).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Air-Flow Control Members (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Duct Arrangements (AREA)

Claims (6)

  1. Modul (100) zur Bereitstellung eines Fluidvorhangs (101), wie eines Luftvorhangs, zwischen verschiedenen Umgebungen, wobei das Modul einen Strömungskanal (102) bildet, wobei das Modul umfasst:
    - einen Einlass (103) zum Einbringen eines Luftstroms durch den Strömungskanal (102) des Moduls,
    - einen Auslass (104) zum Einbringen des Luftvorhangs,
    - eine Wabenstruktur (105) vor dem Auslass (104), um den Strom für den Fluidvorhang zu laminarisieren, wobei die Wabenstruktur mehrere parallele Leitungen (106) zum Führen des Stroms und Unterdrücken von Instabilitäten im Strom stromabwärts davon umfasst, und
    - eine mechanische Struktur vor dem Auslass (104),
    dadurch gekennzeichnet, dass
    - die mechanische Struktur vor dem Auslass ein S-förmiger Ablenker (107) ist, der ausgelegt ist, den Luftstrom vom Einlass (103) zur Wabenstruktur (105) zu führen, so dass ein größerer dynamischer Druck und dadurch eine größere Fluidgeschwindigkeit in die Distanz von der Mittellinie (109) der Wabenstruktur eingebracht werden, und dadurch ausgelegt ist, das Geschwindigkeitsprofil des Stroms vor der Wabenstruktur zu ändern, so dass das Geschwindigkeitsprofil des Stroms nach der Wabenstruktur (105) oder dem Auslass (104) ein schräges parabolisches Geschwindigkeitsprofil mit einer Spitze (108) ist, die von der Mittellinie (109) des symmetrischen parabolischen Geschwindigkeitsprofils verschoben ist.
  2. Modul nach Anspruch 1, wobei die Form des Ablenkers (107) in der stromabwärtigen Richtung des Einlassstroms konvergierend ist, vorteilhaft kontinuierlich konvergierend, und am vorteilhaftesten kontinuierlich, jedoch nicht-linear konvergierend zur Wabenstruktur (105).
  3. Modul nach Anspruch 2, wobei die erste Krümmung (107a) des S-förmigen Ablenkers oder die Spitze oder der Scheitel des konvexförmigen Ablenkers zur Wabenstruktur (105) in der stromabwärtigen Richtung des Einlassstroms vor der Mittellinie (109) der Wabenstruktur angeordnet ist.
  4. Modul nach Anspruch 2 oder 3, wobei die zweite Krümmung (107b) des S-förmigen Ablenkers in der zur ersten Kurve entgegengesetzten Richtung in der stromabwärtigen Richtung des Einlassstroms vor der Mittellinie (109) der Wabenstruktur angeordnet ist.
  5. Anordnung (10, 200), wie eine gekühlte Anzeigevorrichtung, umfassend einen Anzeigeraum (201), eine Zugangsöffnung (202) vor dem Anzeigeraum, einen Fluidvorhang (101), wie ein Luftvorhang-Bereitstellungsmittel mit einem Strömungskanal (102) zur Herstellung des Vorhangs quer über die Zugangsöffnung (202),
    dadurch gekennzeichnet, dass die Vorrichtung umfasst:
    das Modul (100) nach einem der Ansprüche 1 bis 4 zur Bereitstellung des Fluidvorhangs (101).
  6. Verfahren zur Bereitstellung eines Fluidvorhangs (101), wie eines Luftvorhangs zwischen verschiedenen Umgebungen, umfassend die Schritte:
    - Einbringen eines Luftstroms (110) in einen Einlass (103) von Fluidvorhang-Bereitstellungsmitteln (102 bis 109),
    - Laminarisieren des Luftstroms für den Luftvorhang über eine Wabenstruktur (105), umfassend mehrere parallele Leitungen (106) zum Führen des Stroms und Unterdrücken von Instabilitäten im Strom stromabwärts davon und vor einem Auslass (104), und
    dadurch gekennzeichnet, dass das Verfahren ferner umfasst:
    - Ändern des Geschwindigkeitsprofils des Stroms vor der Wabenstruktur durch eine mechanische Struktur, die ein S-förmiger Ablenker (107) ist, der den Fluidstrom vom Einlass (103) zur Wabenstruktur (105) führt, so dass ein größerer dynamischer Druck und dadurch eine größere Fluidgeschwindigkeit in die Distanz von der Mittellinie (109) der Wabenstruktur eingebracht werden, und dadurch das Geschwindigkeitsprofil des Stroms vor der Wabenstruktur ändert, so dass das Geschwindigkeitsprofil des Stroms nach der Wabenstruktur (105) oder dem Auslass (104) ein schräges parabolisches Geschwindigkeitsprofil mit einer Spitze (108) ist, die von der Mittellinie (109) des symmetrischen parabolischen Geschwindigkeitsprofils verschoben ist.
EP13169365.7A 2012-05-28 2013-05-27 Modul, Vorrichtung und Verfahren zur Bereitstellung eines Flüssigkeitvorhangs Active EP2668875B8 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13169365T PL2668875T3 (pl) 2012-05-28 2013-05-27 Moduł, urządzenie i sposób do zapewniania kurtyny płynowej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20125567A FI125239B (en) 2012-05-28 2012-05-28 Module, arrangement and method for producing a fluid curtain

Publications (3)

Publication Number Publication Date
EP2668875A1 EP2668875A1 (de) 2013-12-04
EP2668875B1 true EP2668875B1 (de) 2018-04-18
EP2668875B8 EP2668875B8 (de) 2018-06-06

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EP13169365.7A Active EP2668875B8 (de) 2012-05-28 2013-05-27 Modul, Vorrichtung und Verfahren zur Bereitstellung eines Flüssigkeitvorhangs

Country Status (8)

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US (1) US20130316635A1 (de)
EP (1) EP2668875B8 (de)
DK (1) DK2668875T3 (de)
FI (1) FI125239B (de)
LT (1) LT2668875T (de)
PL (1) PL2668875T3 (de)
RU (1) RU2013125360A (de)
TR (1) TR201809561T4 (de)

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Publication number Priority date Publication date Assignee Title
US9687088B2 (en) * 2013-04-08 2017-06-27 Heatcraft Refrigeration Products Llc Deflector for display cases
CN104180584A (zh) * 2014-08-25 2014-12-03 山东小鸭零售设备有限公司 一种冷柜阻尼阶梯式风幕结构
US11679287B2 (en) 2014-12-04 2023-06-20 ResMed Pty Ltd Wearable device for delivering air
US10016071B2 (en) 2016-05-31 2018-07-10 Pepsico, Inc. Product merchandising systems and methods
US20200196776A1 (en) * 2018-12-21 2020-06-25 Heatcraft Refrigeration Products, Llc Refrigerated display case having a central return air duct
JP6985614B2 (ja) * 2019-03-15 2021-12-22 ダイキン工業株式会社 吹出口アダプター及び吹出口アダプターを備えた空気調和機

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JPS5920615Y2 (ja) * 1978-07-14 1984-06-15 三菱電機株式会社 冷蔵オ−プンシヨ−ケ−ス
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Also Published As

Publication number Publication date
EP2668875A1 (de) 2013-12-04
RU2013125360A (ru) 2014-12-10
PL2668875T3 (pl) 2018-09-28
DK2668875T3 (en) 2018-07-23
FI20125567A (fi) 2013-11-29
LT2668875T (lt) 2018-07-25
TR201809561T4 (tr) 2018-07-23
EP2668875B8 (de) 2018-06-06
US20130316635A1 (en) 2013-11-28
FI125239B (en) 2015-07-31

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