EP2923162B1 - Appareil frigorifique et procédé de fonctionnement d'un tel appareil - Google Patents

Appareil frigorifique et procédé de fonctionnement d'un tel appareil Download PDF

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Publication number
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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EP
European Patent Office
Prior art keywords
evaporator
light
air
refrigerating
wavelength
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Application number
EP13795714.8A
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German (de)
English (en)
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EP2923162A1 (fr
Inventor
Peter Immerath
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Individual
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Priority to PL13795714T priority Critical patent/PL2923162T3/pl
Publication of EP2923162A1 publication Critical patent/EP2923162A1/fr
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Publication of EP2923162B1 publication Critical patent/EP2923162B1/fr
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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)

Claims (9)

  1. Dispositif de réfrigération (1) avec un espace réfrigérant (6) destiné à recevoir des produits à réfrigérer, avec au moins un évaporateur (11) destiné à refroidir de l'air circulant autour des produits à réfrigérer, avec au moins un ventilateur pour brasser l'air sortant de l'espace réfrigérant (6) via l'au moins un évaporateur (11) et en retour dans l'espace réfrigérant (6), avec un échangeur thermique (12) à lamelles sur un côté d'affluence (13) de l'au moins un évaporateur (11), à travers lequel l'air afflue dans l'au moins un évaporateur (11) et avec un agent réfrigérant au moyen duquel de la chaleur peut être soutirée à l'air dans l'au moins un évaporateur (11) et avec un système d'irradiation (14) au moyen duquel l'échangeur thermique à lamelles peut être irradié de lumière bleu, caractérisé en ce que la lumière présente une longueur d'ondes λ de 450,8 ± 5 nm.
  2. Dispositif de réfrigération (1) selon la revendication précédente, caractérisé en ce que le système d'irradiation (14) comporte au moins une diode (LED 20) émettant de la lumière pour générer la lumière.
  3. Dispositif de réfrigération (1) selon la revendication précédente, caractérisé en ce que la longueur d'ondes λ de l'au moins une LED (20) est réglable.
  4. Dispositif de réfrigération (1) selon l'une quelconque des revendications 2 ou 3, caractérisé en ce que l'au moins une LED (20) est coulée dans une résine.
  5. Dispositif de réfrigération (1) selon l'une quelconque des revendications précédentes, caractérisé par au moins un élément de mesure 22, au moyen duquel la longueur d'ondes de la lumière peut être déterminée.
  6. Dispositif de réfrigération (1) selon l'une quelconque des revendications précédentes, caractérisé par au moins une source de lumière UVA et/ou UVC.
  7. Procédé destiné à faire fonctionner un dispositif de réfrigération (1) avec un espace réfrigérant (6) destiné à recevoir des produits à réfrigérer et avec au moins un évaporateur (11) destiné à refroidir de l'air circulant autour des produits à réfrigérer, au moins un ventilateur brassant l'air sortant de l'espace réfrigérant (6) via l'au moins un évaporateur (11) et en retour dans l'espace réfrigérant (6), l'air affluant sur un côté d'affluence (13) de l'au moins un évaporateur (11) via un échangeur thermique (12) à lamelles dans l'au moins un évaporateur (11) et l'air dans l'au moins un évaporateur (11) restituant de la chaleur à un agent réfrigérant et dans le dispositif de réfrigération (1), l'échangeur thermique (12) à lamelles étant irradié de lumière bleue, caractérisé en ce que la lumière présente une longueur d'ondes λ de 450,8 ± 5 nm.
  8. Procédé selon la revendication précédente, caractérisé en ce que l'air dans l'espace réfrigérant (6) présente en moyenne une température inférieure à 8 °C.
  9. Procédé selon l'une quelconque des revendications 7 ou 8, caractérisé en ce que l'au moins un évaporateur (11) est dégivré au moins quotidiennement.
EP13795714.8A 2012-11-23 2013-11-20 Appareil frigorifique et procédé de fonctionnement d'un tel appareil Active EP2923162B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13795714T PL2923162T3 (pl) 2012-11-23 2013-11-20 Urządzenie chłodnicze oraz sposób eksploatacji urządzenia chłodniczego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012221471.2A DE102012221471B4 (de) 2012-11-23 2012-11-23 Kühlvorrichtung und Verfahren zum Betreiben einer Kühlvorrichtung
PCT/EP2013/074297 WO2014079892A1 (fr) 2012-11-23 2013-11-20 Dispositif de refroidissement et procédé permettant de faire fonctionner un dispositif de refroidissement

Publications (2)

Publication Number Publication Date
EP2923162A1 EP2923162A1 (fr) 2015-09-30
EP2923162B1 true EP2923162B1 (fr) 2016-09-14

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Application Number Title Priority Date Filing Date
EP13795714.8A Active EP2923162B1 (fr) 2012-11-23 2013-11-20 Appareil frigorifique et procédé de fonctionnement d'un tel appareil

Country Status (5)

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EP (1) EP2923162B1 (fr)
DE (1) DE102012221471B4 (fr)
ES (1) ES2606836T3 (fr)
PL (1) PL2923162T3 (fr)
WO (1) WO2014079892A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534052A (ja) * 1991-07-29 1993-02-09 Osaka Shosen Mitsui Senpaku Kk 園芸作物の保蔵方法及びその装置
US6726341B2 (en) * 2001-10-12 2004-04-27 Koninklijke Philips Electronics N.V. LED illumination for cold storage compartments
ITPN20010050U1 (it) * 2001-12-19 2003-06-19 Electrolux Zanussi Elettrodome Apparecchio frigorifero con dispositivo perfezionato di depurazione dell'aria.
GB2437171B (en) * 2006-04-11 2008-08-13 Lionel Scott Produce treatment method
KR100758208B1 (ko) * 2006-07-03 2007-09-12 주식회사 대우일렉트로닉스 야채의 광합성이 가능한 냉장고 및 이의 제어 방법
JP5359174B2 (ja) * 2007-10-31 2013-12-04 パナソニック株式会社 冷蔵庫
JP5127418B2 (ja) * 2007-11-27 2013-01-23 株式会社東芝 冷蔵庫
JP2010249427A (ja) * 2009-04-16 2010-11-04 Mitsubishi Electric Corp 冷蔵庫
JP2011142828A (ja) 2010-01-12 2011-07-28 Waseda Univ 光感受性遺伝子発現調節システム
WO2012149992A1 (fr) * 2011-05-04 2012-11-08 Merck Patent Gmbh Dispositif de conservation de produits frais

Also Published As

Publication number Publication date
DE102012221471B4 (de) 2014-06-26
DE102012221471A1 (de) 2014-05-28
ES2606836T3 (es) 2017-03-28
PL2923162T3 (pl) 2017-04-28
EP2923162A1 (fr) 2015-09-30
WO2014079892A1 (fr) 2014-05-30

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