EP2923162B1 - Cooling device and method for operating the same - Google Patents
Cooling device and method for operating the same Download PDFInfo
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- EP2923162B1 EP2923162B1 EP13795714.8A EP13795714A EP2923162B1 EP 2923162 B1 EP2923162 B1 EP 2923162B1 EP 13795714 A EP13795714 A EP 13795714A EP 2923162 B1 EP2923162 B1 EP 2923162B1
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- evaporator
- light
- air
- refrigerating
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- 238000001816 cooling Methods 0.000 title claims description 39
- 238000000034 method Methods 0.000 title claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims 2
- 241000228143 Penicillium Species 0.000 description 13
- 235000013305 food Nutrition 0.000 description 7
- 230000012010 growth Effects 0.000 description 7
- 241000233866 Fungi Species 0.000 description 6
- 206010061217 Infestation Diseases 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 235000015173 baked goods and baking mixes Nutrition 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000035800 maturation Effects 0.000 description 3
- 230000004060 metabolic process Effects 0.000 description 3
- 241000228212 Aspergillus Species 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010003694 Atrophy Diseases 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 241000864266 Penicillium verrucosum Species 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000037444 atrophy Effects 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011059 hazard and critical control points analysis Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000014493 regulation of gene expression Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/042—Air treating means within refrigerated spaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D27/00—Lighting arrangements
- F25D27/005—Lighting arrangements combined with control means
Definitions
- the invention relates firstly to a cooling device with a cooling space for receiving refrigerated goods, with at least one evaporator for cooling air flowing around the refrigerated goods, with at least one fan for circulating the air from the refrigerator through the at least one evaporator and back into the refrigerator, with a Laminated heat exchanger on an inflow side of the at least one evaporator, through which the air flows into the at least one evaporator, and with a refrigerant, by means of which the air in the at least one evaporator heat is withdrawn and with an irradiation device (14), by means of which the finned heat exchanger blue light is irradiated.
- the invention further relates to a method for operating such a cooling device.
- Cooling devices and methods for their operation are well known for decades: They consist essentially of a closed, usually both heat and air-insulated insulated refrigerator. At least one evaporator is mounted in the cooling space and at least one fan, which circulates the air in the cooling space and sucks or presses through the evaporator.
- the evaporator can be a classic or a "flooded" evaporator.
- the applicant offers such cooling devices for the food industry, in particular for the storage and maturation of baked goods and their precursors.
- the evaporators are usually mounted under the ceiling of the refrigerator and placed there directly on fans that suck the air through the evaporator. Often, the vaporizer is laminated optically downwards by a suspended ceiling and the air forced.
- Penicillium finds in these cooling devices a nearly ideal medium from various deposited there carbohydrates:
- the goods to be cooled contain flour and can be dusted with this, Stikkenwagen to Storage of dough pieces is dusted with starch to avoid sticking and in carton storage the air contains the finest cellulose fibers.
- Cellulose and starch are an ideal breeding ground for mold fungi.
- the evaporator must be regularly defrosted - up to several times a day - to avoid permanent icing. The temporarily elevated temperature of the evaporator further stimulates the spread of any existing Penicillium infestation.
- the Penicillium infestation of the lamellae is technically problematic in several respects: Firstly, the mold moves the interstices of the lamellae and reduces the cooling capacity of the evaporator to complete failure, to the other forms Penicillium as a metabolite citric acid, the Aluminum attacks existing lamellae and can completely decompose.
- Penicillium To limit the contamination with Penicillium, the known plants are regularly - usually at intervals of a few weeks - completely cleared and treated with very aggressive cleaning agents.
- JP 2009-127977 A discloses a cooling device of the aforementioned type, the lamellae are coated with a photosensitive substance and are irradiated to activate this substance with visible - for example blue - light.
- Schmidt-Heydt et al Influence of light on food relevant fungi. Int. J. of Food Microbiology 145 (2011) 229-237 It is known that irradiating foods with blue or red light drastically reduces the growth of Penicillium. In particular, blocked blue light with wavelength ⁇ 455 nm completely the growth of P. verrucosum. JP2011142828A identifies a possible cause of a photo-sensitive regulation of gene expression.
- the invention has for its object to reduce the contamination of the cooling device with Penicillium.
- the light has a wavelength ⁇ of 450.8 ⁇ 5 nm .
- This light almost completely inhibits the growth of Penicillium and thus reduces the evaporation of the evaporator: Under irradiation, the metabolism immediately stops in a fouling with Penicillium on the lamellae. The vegetation dies without spores being formed. New vegetation does not arise.
- the irradiation device of a cooling device according to the invention preferably has at least one light-emitting diode (LED) for generating the light.
- LED light-emitting diode
- Diodes are particularly suitable for use in cooling devices, because they have a significantly lower energy consumption compared to other bulbs - and thus a lower heat development.
- the wavelength ⁇ of the at least one LED is preferably adjustable in such an irradiation device.
- the irradiation device with such a so-called "RGB LED" can - as an alternative to the irradiation with blue light - take on other functions: For example, the irradiation device can be temporarily switched to red or green light in which a possible infestation with mold fungi is visually recognizable in the form of dark spots easily. Furthermore, the irradiation device for illuminating the cooling space can be switched to white light.
- the at least one LED is cast in a resin.
- a large number of LEDs can be combined in a small space.
- a cooling device has at least one measuring element, by means of which the wavelength of the light can be determined.
- a change in the wavelength of the light can be detected, for example, by aging of the lighting means.
- the wavelength ⁇ can be tracked automatically.
- a cooling device advantageously additionally has at least one UV-A and / or UV-C light source.
- UV-A light wavelength ⁇ 315 to 380 nm, so-called “black light” Penicillium phosphorescent and is therefore particularly easy to detect even with only minor infestation.
- the effect of UV-C (as described above) is already used for sterilization.
- the light has a wavelength ⁇ of 450.8 ⁇ 5 nm .
- Such a method according to the invention can be carried out with one of the above-described cooling devices according to the invention and is distinguished by the advantages mentioned there.
- the process according to the invention is food-compliant (tested according to CE and HACCP) and can effectively prevent mold fouling of new plants (cold rooms, cabinets, counters, gauges) and significantly lengthen the cleaning cycles.
- the costs are compared to UV-C much lower, disadvantages such as high heat radiation, very limited lifespan, health hazards of mishandling and risk of glass breakage do not occur.
- the selective frequency of the method according to the invention stimulates certain protein molecules of the mold to vibrate.
- the selected frequency has a very strong effect on the metabolism and growth of mold fungi to the point of atrophy and death. It is believed that a gene switch of the mold is turned over and thereby prevents growth, so that the mold can neither form spores nor develop resistance.
- the air in the cooling space preferably has on average a temperature below 8 ° C. This is the typical work area of Applicants' refrigerators for use in the food industry, particularly for the storage and maturation of baked goods and their precursors.
- the at least one evaporator is particularly preferably defrosted at least daily.
- the permanent icing of the evaporator is effectively avoided.
- Cooling device 1 has a front wall 2, a rear wall 3, two side walls 4, a bottom 5 and a ceiling 6, each of which is insulated in terms of heat and ventilation.
- a door 7 is attached in the front wall 2, a door 7 is attached.
- the cooling device 1 offers in a refrigerator 8, for example, parking space for up to three jacks 9 for storage and maturation of dough pieces and for the storage of finished baked goods.
- the cold room 6 is bounded above a suspended ceiling 10, above which an evaporator 11 is mounted.
- the evaporator 11 has a fin heat exchanger 12 and on its (not shown) Auströmseite three fans for circulating the air.
- the air flow during operation of the cooling device 1 is indicated by arrows: The fans suck in room air from the cooling chamber 6 on the front wall. 2 the cooling device 1 between the ceiling 6 and the suspended ceiling 10, and through the inflow side 13 of the fin heat exchanger 12 in the evaporator 11 and then push the cooled air to the rear wall 3 of the cooling device 1 back into the cooling chamber. 6
- the cooling device 1 has an irradiation device 14, which is directed for irradiating the inflow side 13 of the evaporator 11 with blue light directly on the fin heat exchanger 12.
- the irradiation device 14 has a housing 15 made of an extruded aluminum U-profile with a width 16 of 20 mm and a height 17 of 15 mm and a length 18 of 100 cm , into which a circuit board 19 is embedded. On the board 19, about one hundred RGB LED 20 are arranged in a row next to each other at a distance 21 of 10 mm .
- a driver (not shown) for the LED 20 is further arranged with a pulse width modulation converter, which drives the LED 20 with the suitable for blue light with a wavelength ⁇ of 450.8 ⁇ 5 nm frequency.
- the LED 20 can also be driven to emit white light.
- a measuring element 22 here: a photocell with a peak at 460 nm ) is arranged on the circuit board 19 for the continuous monitoring of the wavelength of the blue light.
- the circuit board 19, the LED 20 and the photocell are encapsulated with a synthetic resin with high breaking strength and optical quality.
- the irradiation device 14 has a connecting cable 23 for connection to a not shown power supply with a supply voltage of 24 V and a looped contact 24 for connecting a further irradiation device 14.
- the irradiation device 14 has a power consumption of 8.5 W.
- the irradiation device LED with a fixed wavelength of 450 nm as well as individual UV-A and UV-C LED.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Description
Die Erfindung betrifft zunächst eine Kühlvorrichtung mit einem Kühlraum zur Aufnahme von Kühlgut, mit mindestens einem Verdampfer zum Kühlen von das Kühlgut umströmender Luft, mit mindestens einem Lüfter zum Umwälzen der Luft aus dem Kühlraum durch den mindestens einen Verdampfer und zurück in den Kühlraum, mit einem Lamellenwärmetauscher auf einer Einströmseite des mindestens einen Verdampfers, durch den die Luft in den mindestens einen Verdampfer einströmt, und mit einem Kältemittel, mittels dessen der Luft in dem mindestens einen Verdampfer Wärme entziehbar ist und mit einer Bestrahlungseinrichtung (14), mittels derer der Lamellenwärmetauscher mit blauem Licht bestrahlbar ist. Die Erfindung betrifft des Weiteren ein Verfahren zum Betreiben einer solchen Kühlvorrichtung.The invention relates firstly to a cooling device with a cooling space for receiving refrigerated goods, with at least one evaporator for cooling air flowing around the refrigerated goods, with at least one fan for circulating the air from the refrigerator through the at least one evaporator and back into the refrigerator, with a Laminated heat exchanger on an inflow side of the at least one evaporator, through which the air flows into the at least one evaporator, and with a refrigerant, by means of which the air in the at least one evaporator heat is withdrawn and with an irradiation device (14), by means of which the finned heat exchanger blue light is irradiated. The invention further relates to a method for operating such a cooling device.
Kühlvorrichtungen und Verfahren zu deren Betrieb sind seit Jahrzehnten allgemein bekannt: Sie bestehen im Wesentlichen aus einem geschlossenen, meist sowohl wärme- als auch lufttechnisch isolierten Kühlraum. In dem Kühlraum ist mindestens ein Verdampfer angebracht und mindestens ein Lüfter, der die Luft in dem Kühlraum umwälzt und durch den Verdampfer saugt oder presst. Der Verdampfer kann ein klassischer oder ein "gefluteter" Verdampfer sein.Cooling devices and methods for their operation are well known for decades: They consist essentially of a closed, usually both heat and air-insulated insulated refrigerator. At least one evaporator is mounted in the cooling space and at least one fan, which circulates the air in the cooling space and sucks or presses through the evaporator. The evaporator can be a classic or a "flooded" evaporator.
Die Anmelderin bietet solche Kühlvorrichtungen für die Lebensmittelindustrie, insbesondere für die Lagerung und Reifung von Backwaren und deren Vorprodukten an. Die Verdampfer sind in der Regel unter der Decke des Kühlraums angebracht und dort unmittelbar auf Lüfter aufgesetzt, die die Luft durch die Verdampfer saugen. Häufig wird durch eine abgehängte Decke der Verdampfer nach unten optisch kaschiert und die Luft zwangsgeführt.The applicant offers such cooling devices for the food industry, in particular for the storage and maturation of baked goods and their precursors. The evaporators are usually mounted under the ceiling of the refrigerator and placed there directly on fans that suck the air through the evaporator. Often, the vaporizer is laminated optically downwards by a suspended ceiling and the air forced.
In diesen Kühlvorrichtungen liegt die Lufttemperatur immer unterhalb von 8 °C und je nach Einsatzzweck bei bis zu -38 °C. In diesem Temperaturbereich ist das Wachstum von Schimmelpilzen der Gattung Aspergillus praktisch unbedeutend, von Schimmel der Gattung Penicillium jedoch nur verlangsamt.In these cooling devices the air temperature is always below 8 ° C and depending on the application up to -38 ° C. In this temperature range, the growth of mold fungi of the genus Aspergillus is practically insignificant, but only slowed down by mold of the genus Penicillium.
An den Lamellen des Verdampfers findet Penicillium in diesen Kühlvorrichtungen einen nahezu idealen Nährboden aus verschiedenen dort abgelagerten Kohlehydraten: Die zu kühlenden Waren enthalten Mehl und können mit diesem bestäubt sein, Stikkenwagen zur Lagerung von Teiglingen werden mit Stärke bestäubt, um ein Anhaften zu vermeiden und bei Kartonlagerung enthält die Luft feinste Zellulosefasern. Zellulose und Stärke sind für Schimmelpilze ein idealer Nährboden. Zudem müssen die Verdampfer regelmäßig - bis zu mehrmals täglich - abgetaut werden, um ein dauerhaftes Vereisen zu vermeiden. Die vorübergehend erhöhte Temperatur des Verdampfers regt die Ausbreitung eines eventuell bereits vorhandenen Penicillium-Befalls weiter an.At the fins of the evaporator Penicillium finds in these cooling devices a nearly ideal medium from various deposited there carbohydrates: The goods to be cooled contain flour and can be dusted with this, Stikkenwagen to Storage of dough pieces is dusted with starch to avoid sticking and in carton storage the air contains the finest cellulose fibers. Cellulose and starch are an ideal breeding ground for mold fungi. In addition, the evaporator must be regularly defrosted - up to several times a day - to avoid permanent icing. The temporarily elevated temperature of the evaporator further stimulates the spread of any existing Penicillium infestation.
Abgesehen von hygienischen Problemen ist der Penicillium-Befall der Lamellen auch technisch in mehrfacher Hinsicht problematisch: Zum Einen verlegt der Schimmel die Zwischenräume der Lamellen und vermindert die Kühlleistung der Verdampfer bis hin zum vollständigen Ausfall, zum Andern bildet Penicillium als Stoffwechselprodukt Citronensäure, die die aus Aluminium bestehenden Lamellen angreift und vollständig zersetzen kann.Apart from hygienic problems, the Penicillium infestation of the lamellae is technically problematic in several respects: Firstly, the mold moves the interstices of the lamellae and reduces the cooling capacity of the evaporator to complete failure, to the other forms Penicillium as a metabolite citric acid, the Aluminum attacks existing lamellae and can completely decompose.
Um die Kontamination mit Penicillium zu begrenzen, werden die bekannten Anlagen regelmäßig - meist im Abstand von wenigen Wochen - vollständig ausgeräumt und mit sehr aggressiven Reinigungsmitteln behandelt.To limit the contamination with Penicillium, the known plants are regularly - usually at intervals of a few weeks - completely cleared and treated with very aggressive cleaning agents.
Aus
Im Hintergrund der Erfindung sind beispielsweise von STERILSYSTEMS GmbH, Salzburg/AT Luftentkeimungsgeräte für lebensmitteltechnische Anlagen bekannt, in denen die Raumluft an einem UV-C-Strahler (Wellenlänge λ 100 bis 280 nm) vorbeigeführt wird, um Mikroorganismen wie Keime, Viren, Hefen und Schimmelsporen sicher zu eliminieren.In the background of the invention STERILSYSTEMS GmbH, Salzburg / AT Luftentgeimungsgeräte for food processing plants are known, for example, in which the air is passed to a UV-C emitter (wavelength λ 100 to 280 nm ) to microorganisms such as germs, viruses, yeasts and Safely eliminate mold spores.
Weiterhin ist im Hintergrund der Erfindung aus
Der Erfindung liegt die Aufgabe zugrunde, die Kontamination der Kühlvorrichtung mit Penicillium zu vermindern.The invention has for its object to reduce the contamination of the cooling device with Penicillium.
Ausgehend von den bekannten Kühlvorrichtungen wird nach der Erfindung vorgeschlagen, dass das Licht eine Wellenlänge λ von 450,8 ± 5 nm aufweist. Dieses Licht hemmt nahezu vollständig das Wachstum von Penicillium und vermindert so die Kontamination des Verdampfers: Unter der Bestrahlung kommt in einem auf den Lamellen bestehenden Bewuchs mit Penicillium der Stoffwechsel unmittelbar zum Stillstand. Der Bewuchs stirbt ab, ohne dass Sporen gebildet werden. Neuer Bewuchs entsteht nicht.Starting from the known cooling devices is proposed according to the invention that the light has a wavelength λ of 450.8 ± 5 nm . This light almost completely inhibits the growth of Penicillium and thus reduces the evaporation of the evaporator: Under irradiation, the metabolism immediately stops in a fouling with Penicillium on the lamellae. The vegetation dies without spores being formed. New vegetation does not arise.
Im für die Lebensmittelkühlung relevanten Temperaturbereich findet man fast nur Schimmelpilze der Gattung Penicillium. Diese wachsen zwischen +10 und -3 °C sehr gut. Bei Temperaturen bis zu -10 °C kann man noch Wachstum beobachten. Andere Schimmelpilze, wie z. B. Aspergillus oder auch Fusarien benötigen für ihren Stoffwechsel deutlich höhere Temperaturen. In einer erfindungsgemäßen Kühlvorrichtung werden bei üblichen Betriebstemperaturen annähernd alle Schimmelpilze der Gattung Penicillium am Wachstum gehindert und schließlich abgetötet.In the temperature range relevant for the food cooling one finds almost only molds of the genus Penicillium. These grow very well between +10 and -3 ° C. At temperatures down to -10 ° C you can still observe growth. Other molds, such. B. Aspergillus or Fusaria require significantly higher temperatures for their metabolism. In a cooling device according to the invention, almost all mold fungi of the genus Penicillium are prevented from growing at normal operating temperatures and finally killed.
Bevorzugt weist die Bestrahlungseinrichtung einer erfindungsgemäßen Kühlvorrichtung mindestens eine Licht-emittierende Diode (LED) zum Erzeugen des Lichts auf. Dioden sind für den Einsatz in Kühlvorrichtungen besonders geeignet, weil sie gegenüber anderen Leuchtmitteln einen erheblich geringeren Energieverbrauch - und damit eine geringere Wärmeentwicklung - aufweisen.The irradiation device of a cooling device according to the invention preferably has at least one light-emitting diode (LED) for generating the light. Diodes are particularly suitable for use in cooling devices, because they have a significantly lower energy consumption compared to other bulbs - and thus a lower heat development.
Vorzugsweise ist in einer solchen Bestrahlungseinrichtung die Wellenlänge λ der mindestens einen LED einstellbar. Die Bestrahlungseinrichtung mit solchen sogenannten "RGB-LED" kann - alternativ zur Bestrahlung mit blauem Licht - weitere Funktionen übernehmen: Beispielsweise kann die Bestrahlungseinrichtung vorübergehend auf rotes oder grünes Licht umgestellt werden, in dem ein möglicher Befall mit Schimmelpilzen optisch in Form von dunklen Flecken leicht zu erkennen ist. Weiterhin kann die Bestrahlungseinrichtung zur Beleuchtung des Kühlraums auf weißes Licht umgestellt werden.The wavelength λ of the at least one LED is preferably adjustable in such an irradiation device. The irradiation device with such a so-called "RGB LED" can - as an alternative to the irradiation with blue light - take on other functions: For example, the irradiation device can be temporarily switched to red or green light in which a possible infestation with mold fungi is visually recognizable in the form of dark spots easily. Furthermore, the irradiation device for illuminating the cooling space can be switched to white light.
Besonders bevorzugt ist in einer LED-Bestrahlungseinrichtung einer erfindungsgemäßen Kühlvorrichtung die mindestens eine LED in ein Harz vergossen. So kann eine große Zahl von LED auf geringem Raum kombiniert werden.Particularly preferably, in an LED irradiation device of a cooling device according to the invention, the at least one LED is cast in a resin. Thus, a large number of LEDs can be combined in a small space.
In einer vorteilhaften Ausprägung weist eine erfindungsgemäße Kühlvorrichtung mindestens ein Messelement auf, mittels dessen die Wellenlänge des Lichts bestimmbar ist. In einer solchen erfindungsgemäßen Kühlvorrichtung kann eine Veränderung der Wellenlänge des Lichts beispielsweise durch Alterung der Leuchtmittel detektiert werden. Bei Verwendung einstellbarer LED kann die Wellenlänge λ automatisch nachgeführt werden.In an advantageous embodiment, a cooling device according to the invention has at least one measuring element, by means of which the wavelength of the light can be determined. In such a cooling device according to the invention, a change in the wavelength of the light can be detected, for example, by aging of the lighting means. When using adjustable LED, the wavelength λ can be tracked automatically.
Eine erfindungsgemäße Kühlvorrichtung weist vorteilhafter Weise zusätzlich mindestens eine UV-A- und/oder UV-C-Lichtquelle. Unter UV-A-Licht (Wellenlänge λ 315 bis 380 nm, sog. "Schwarzlicht") phosphoresziert Penicillium und ist so auch schon bei nur geringem Befall besonders leicht zu erkennen. Die Wirkung von UV-C wird (wie oben beschrieben) bereits zur Entkeimung eingesetzt.A cooling device according to the invention advantageously additionally has at least one UV-A and / or UV-C light source. Under UV-A light (wavelength λ 315 to 380 nm, so-called "black light") Penicillium phosphorescent and is therefore particularly easy to detect even with only minor infestation. The effect of UV-C (as described above) is already used for sterilization.
Ausgehend von den bekannten Verfahren wird nach der Erfindung vorgeschlagen, dass das Licht eine Wellenlänge λ von 450,8 ± 5 nm aufweist. Ein solches erfindungsgemäßes Verfahren lässt sich mit einer der oben beschriebenen erfindungsgemäßen Kühlvorrichtungen ausführen und zeichnet sich durch die dort genannten Vorteile aus.Starting from the known methods, it is proposed according to the invention that the light has a wavelength λ of 450.8 ± 5 nm . Such a method according to the invention can be carried out with one of the above-described cooling devices according to the invention and is distinguished by the advantages mentioned there.
Das erfindungsgemäßen Verfahren ist lebensmittelkonform (nach CE und HACCP geprüft) und kann gerade bei Neuanlagen (Kühlzellen, -schränken, -theken, Gärautomaten) ein Verschimmeln der Verdampfer wirkungsvoll verhindern und die Reinigungszyklen deutlich verlängern. Die Kosten sind im Vergleich zu UV-C sehr viel niedriger, Nachteile wie starke Wärmeabstrahlung, sehr begrenzte Lebensdauer, Gesundheitsgefährdung bei falscher Handhabung und Gefahr des Glasbruchs treten nicht auf.The process according to the invention is food-compliant (tested according to CE and HACCP) and can effectively prevent mold fouling of new plants (cold rooms, cabinets, counters, gauges) and significantly lengthen the cleaning cycles. The costs are compared to UV-C much lower, disadvantages such as high heat radiation, very limited lifespan, health hazards of mishandling and risk of glass breakage do not occur.
Die selektive Frequenz des erfindungsgemäßen Verfahrens regt bestimmte Eiweißmoleküle des Schimmels zum Schwingen an. Die gewählte Frequenz hat eine sehr starke Wirkung auf Stoffwechsel und Wachstum der Schimmelpilze bis hin zum Verkümmern und Absterben. Es wird vermutet, dass ein Genschalter des Schimmelpilzes umgelegt und dadurch das Wachstum verhindert wird, so dass der Schimmelpilz weder Sporen ausbilden noch Resistenzen entwickeln kann.The selective frequency of the method according to the invention stimulates certain protein molecules of the mold to vibrate. The selected frequency has a very strong effect on the metabolism and growth of mold fungi to the point of atrophy and death. It is believed that a gene switch of the mold is turned over and thereby prevents growth, so that the mold can neither form spores nor develop resistance.
Bevorzugt weist in einem erfindungsgemäßen Verfahren die Luft in dem Kühlraum im Mittel eine Temperatur unterhalb 8 °C auf. Dies ist der typische Arbeitsbereich der Kühlvorrichtungen der Anmelderin zur Verwendung in der Lebensmittelindustrie, insbesondere für die Lagerung und Reifung von Backwaren und deren Vorprodukten.In a method according to the invention, the air in the cooling space preferably has on average a temperature below 8 ° C. This is the typical work area of Applicants' refrigerators for use in the food industry, particularly for the storage and maturation of baked goods and their precursors.
Besonders bevorzugt wird in einem erfindungsgemäßen Verfahren der mindestens eine Verdampfer mindestens täglich abgetaut. So wird das dauerhafte Vereisen des Verdampfers wirksam vermieden.In a method according to the invention, the at least one evaporator is particularly preferably defrosted at least daily. Thus, the permanent icing of the evaporator is effectively avoided.
Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels erläutert. Es zeigen
- Fig. 1
- eine erfindungsgemäße Kühlvorrichtung und
- Fig. 2
- eine Bestrahlungseinrichtung der Kühlvorrichtung.
- Fig. 1
- a cooling device according to the invention and
- Fig. 2
- an irradiation device of the cooling device.
Die in
Den Kühlraum 6 begrenzt nach oben eine abgehängte Decke 10, über der ein Verdampfer 11 angebracht ist. Der Verdampfer 11 weist einen Lamellenwärmetauscher 12 auf sowie auf seiner (nicht dargestellten) Auströmseite drei Lüfter zum Umwälzen der Luft. In der Zeichnungsfigur ist die Luftströmung im Betrieb der Kühlvorrichtung 1 durch Pfeile angedeutet: Die Lüfter saugen Raumluft aus dem Kühlraum 6 an der Vorderwand 2 der Kühlvorrichtung 1 zwischen die Decke 6 und die abgehängte Decke 10, und durch die Einströmseite 13 des Lamellenwärmetauschers 12 in den Verdampfer 11 und schieben die gekühlte Luft anschließend an der Rückwand 3 der Kühlvorrichtung 1 wieder in den Kühlraum 6.The cold room 6 is bounded above a suspended
Weiterhin weist die Kühlvorrichtung 1 eine Bestrahlungseinrichtung 14 auf, die zum Bestrahlen der Einströmseite 13 des Verdampfers 11 mit blauem Licht unmittelbar auf den Lamellenwärmetauscher 12 gerichtet ist. Die Bestrahlungseinrichtung 14 weist ein Gehäuse 15 aus einem extrudierten U-Profil aus Aluminium mit einer Breite 16 von 20 mm und einer Höhe 17 von 15 mm und einer Länge 18 von 100 cm auf, in das eine Platine 19 eingelassen ist. Auf der Platine 19 sind rund hundert RGB-LED 20 in einer Reihe nebeneinander in einem Abstand 21 von 10 mm angeordnet.Furthermore, the
Auf der Platine 19 ist weiterhin ein (nicht dargestellter) Treiber für die LED 20 angeordnet mit einem Pulsweiten-Modulationswandler, der die LED 20 mit der für blaues Licht mit einer Wellenlänge λ von 450,8 ± 5 nm passenden Frequenz ansteuert. Über ein nicht dargestelltes Schaltelement können die LED 20 auch zum Emittieren von weißem Licht angesteuert werden. Weiterhin ist auf der Platine 19 ein Messelement 22 (hier: eine Fotozelle mit einem Peak bei 460 nm) zur fortlaufenden Kontrolle der Wellenlänge des blauen Lichts angeordnet.On the
Die Platine 19, die LED 20 und die Photozelle sind mit einem Kunstharz mit hoher Bruchfestigkeit und optischer Güte vergossen. Die Bestrahlungseinrichtung 14 weist ein Anschlusskabel 23 zum Anschließen an ein nicht dargestelltes Netzteil mit einer Versorgungsspannung von 24 V und einen durchgeschleiften Kontakt 24 zum Anschließen einer weiteren Bestrahlungseinrichtung 14 auf. Die Bestrahlungseinrichtung 14 weist eine Leistungsaufnahme von 8,5 W auf.The
In einem weiteren, nicht dargestellten Ausführungsbeispiel weist die Bestrahlungseinrichtung LED mit einer festen Wellenlänge von 450 nm auf, sowie einzelne UV-A- und UV-C-LED.In a further, not shown embodiment, the irradiation device LED with a fixed wavelength of 450 nm , as well as individual UV-A and UV-C LED.
In den Figuren sind
- 1
- Kühlvorrichtung
- 2
- Vorderwand
- 3
- Rückwand
- 4
- Seitenwand
- 5
- Boden
- 6
- Decke
- 7
- Tür
- 8
- Kühlraum
- 9
- Stikkenwagen
- 10
- abgehängte Decke
- 11
- Verdampfer
- 12
- Lamellenwärmetauscher
- 13
- Einströmseite
- 14
- Bestrahlungseinrichtung
- 15
- Gehäuse
- 16
- Breite
- 17
- Höhe
- 18
- Länge
- 19
- Platine
- 20
- LED
- 21
- Abstand
- 22
- Messelement
- 23
- Anschlusskabel
- 24
- Kontakt
- 1
- cooler
- 2
- front wall
- 3
- rear wall
- 4
- Side wall
- 5
- ground
- 6
- blanket
- 7
- door
- 8th
- refrigerator
- 9
- oven racks
- 10
- suspended ceiling
- 11
- Evaporator
- 12
- Finned heat exchanger
- 13
- inflow
- 14
- irradiation device
- 15
- casing
- 16
- width
- 17
- height
- 18
- length
- 19
- circuit board
- 20
- LED
- 21
- distance
- 22
- measuring element
- 23
- connection cable
- 24
- Contact
Claims (9)
- Refrigerating device (1) with a refrigerating compartment (6) for receiving products to be refrigerated, having at least one evaporator (11) for cooling air flowing around the products to be refrigerated, at least one fan for circulating the air from the refrigerating compartment (6) through the at least one evaporator (11) and back into the refrigerating compartment (6), a finned heat exchanger (12) on an inlet side (13) of the at least one evaporator (11), through which heat exchanger the air flows into the at least one evaporator (11), and having a coolant, by means of which heat can be extracted from the air in the at least one evaporator (11), and having an irradiating device (14) by means of which the finned heat exchanger can be irradiated with blue light,
characterized in that
the light has a wavelength λ of 450.8 ±5 nm. - Refrigerating device (1) according to the previous claim,
characterized in that
the irradiating device (14) comprises at least one light-emitting diode(LED 20) for generating the light. - Refrigerating device (1) according to the previous claim,
characterized in that
the wavelength λ of the at least one LED (20) is adjustable. - Refrigerating device (1) according to any one of Claims 2 to 3,
characterized in that
the at least one LED (20) is encapsulated in a resin. - Refrigerating device (1) according to any one of the previous claims,
characterized by
at least one measuring element 22, by means of which the wavelength of the light can be determined. - Refrigerating device (1) according to any one of the previous claims,
characterized by
at least one UV-A and/or UV-C light source. - Method for operating a refrigerating device (1) with a refrigerating compartment (6) for receiving products to be refrigerated and with at least one evaporator (11) for cooling air flowing around the products to be refrigerated, wherein at least one fan circulates the air from the refrigerating compartment (6) through the at least one evaporator (11) and back into the refrigerating compartment (6), wherein the air flows on an inlet side (13) of the at least one evaporator (11) through a finned heat exchanger (12) into the at least one evaporator (11) and the air in the at least one evaporator (11) emits heat to a coolant, and wherein in the refrigerating device (1) the finned heat exchanger (12) is irradiated with blue light,
characterized in that
the light has a wavelength λ of 450.8 ±5 nm. - Method according to the previous claim,
characterized in that
the air in the refrigerating compartment (6) has an average temperature of less than 8 °C. - Method according to any one of Claims 7 to 8,
characterized in that
the at least one evaporator (11) is defrosted at least daily.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13795714T PL2923162T3 (en) | 2012-11-23 | 2013-11-20 | Cooling device and method for operating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012221471.2A DE102012221471B4 (en) | 2012-11-23 | 2012-11-23 | Cooling device and method for operating a cooling device |
PCT/EP2013/074297 WO2014079892A1 (en) | 2012-11-23 | 2013-11-20 | Refrigerating device, and method for operating a refrigerating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2923162A1 EP2923162A1 (en) | 2015-09-30 |
EP2923162B1 true EP2923162B1 (en) | 2016-09-14 |
Family
ID=49667125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13795714.8A Active EP2923162B1 (en) | 2012-11-23 | 2013-11-20 | Cooling device and method for operating the same |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2923162B1 (en) |
DE (1) | DE102012221471B4 (en) |
ES (1) | ES2606836T3 (en) |
PL (1) | PL2923162T3 (en) |
WO (1) | WO2014079892A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0534052A (en) * | 1991-07-29 | 1993-02-09 | Osaka Shosen Mitsui Senpaku Kk | Method and device for storing garden plant |
US6726341B2 (en) * | 2001-10-12 | 2004-04-27 | Koninklijke Philips Electronics N.V. | LED illumination for cold storage compartments |
ITPN20010050U1 (en) * | 2001-12-19 | 2003-06-19 | Electrolux Zanussi Elettrodome | REFRIGERATOR WITH IMPROVED AIR PURIFICATION DEVICE. |
GB2437171B (en) * | 2006-04-11 | 2008-08-13 | Lionel Scott | Produce treatment method |
KR100758208B1 (en) * | 2006-07-03 | 2007-09-12 | 주식회사 대우일렉트로닉스 | Refrigerator capable of photosynthesis function of vegetable and method for controlling the same |
JP5359174B2 (en) * | 2007-10-31 | 2013-12-04 | パナソニック株式会社 | refrigerator |
JP5127418B2 (en) * | 2007-11-27 | 2013-01-23 | 株式会社東芝 | refrigerator |
JP2010249427A (en) * | 2009-04-16 | 2010-11-04 | Mitsubishi Electric Corp | Refrigerator |
JP2011142828A (en) | 2010-01-12 | 2011-07-28 | Waseda Univ | Photo-sensitive gene expression regulation system |
WO2012149992A1 (en) * | 2011-05-04 | 2012-11-08 | Merck Patent Gmbh | Device for preserving fresh goods |
-
2012
- 2012-11-23 DE DE102012221471.2A patent/DE102012221471B4/en active Active
-
2013
- 2013-11-20 ES ES13795714.8T patent/ES2606836T3/en active Active
- 2013-11-20 PL PL13795714T patent/PL2923162T3/en unknown
- 2013-11-20 EP EP13795714.8A patent/EP2923162B1/en active Active
- 2013-11-20 WO PCT/EP2013/074297 patent/WO2014079892A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
DE102012221471B4 (en) | 2014-06-26 |
DE102012221471A1 (en) | 2014-05-28 |
ES2606836T3 (en) | 2017-03-28 |
PL2923162T3 (en) | 2017-04-28 |
EP2923162A1 (en) | 2015-09-30 |
WO2014079892A1 (en) | 2014-05-30 |
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