WO2006047797A1 - Method for preserving food and presentation shelf for food - Google Patents
Method for preserving food and presentation shelf for food Download PDFInfo
- Publication number
- WO2006047797A1 WO2006047797A1 PCT/AT2005/000077 AT2005000077W WO2006047797A1 WO 2006047797 A1 WO2006047797 A1 WO 2006047797A1 AT 2005000077 W AT2005000077 W AT 2005000077W WO 2006047797 A1 WO2006047797 A1 WO 2006047797A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- presentation
- cooling air
- air
- cooling
- temperature
- Prior art date
Links
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
Definitions
- the invention relates to a method for preserving food, in particular fruit and vegetables, in open presentation shelves, wherein cooled air is passed over the food by means of an evaporator and the heat extracted from the food is removed via a heat exchanger.
- the invention relates to a presentation shelf for food, especially for fruit and vegetables, arranged on a "back wall soils for holding the food and a system for guiding cooling air over the food with at least one fan for conveying the cooling air and zu ⁇ least one evaporator to lower the temperature of the cooling air and at least one heat exchanger for removing the heat extracted from the Lebens ⁇ .
- the present invention is directed primarily to fruits and vegetables which spoil particularly quickly and react particularly sensitively to changes in the temperature and humidity of the ambient air. Nevertheless, the method according to the invention and the presentation rack are also suitable for other foods, such as e.g. Fish, meat, dairy products but also SBA ⁇ goods, such as chocolate or cookies, applicable.
- cooled presentation shelves arecea ⁇ sets, by the storage temperature can be kept below 18 °.
- cooling air which is cooled in an evaporator, blown over the food.
- the moisture is usually removed, as a result of which the moisture is removed from the fruit and vegetables and the spoilage is further accelerated.
- the evaporator normally has a surface temperature below 0 °, the air moisture is bound to it and, as already mentioned, the refrigerated goods are deprived of more and more moisture, which finally leads to drying out of the products.
- humidification systems are used, with which water is sprayed over nozzles on the food.
- No. 5,440,894 A shows a cooling device in which a coolant circulates from a remote source to the corresponding heat exchangers in order to be able to ensure cooling at a substantially constant temperature.
- US Pat. No. 6,390,378 B1 describes a container for the transport of perishable goods, which has a source of moisture, so that a desired relative fugacity of 90% or greater can be achieved.
- US Pat. No. 5,477,702 discloses a refrigerated presentation device for foods, which is characterized by special guides of the cooling air streams. On the type of cooling and a possible moistening of the cooling air is not eing ⁇ gone.
- the object of the present invention is to provide an above-mentioned process for the preservation of foodstuffs, in particular fruit and vegetables, by means of which a particularly long shelf life can be achieved with at the same time the least possible outlay and the lowest possible costs. representation
- the nutritional value of the food should remain as long as possible.
- a further object of the present invention is to provide an above-mentioned presentation shelf for foodstuffs, in particular for fruits and vegetables, by means of which the longest possible shelf life of the food can be achieved while at the same time minimizing assembly and costs.
- Existing presentation shelves should be able to be converted easily and quickly.
- the first object of the invention is achieved in that the air is cooled in the evaporator by means of a cooling liquid having an inlet temperature of more than 0 0 C, preferably from 4 0 C and that the evaporator is dimensioned so that the cooling air has a relative humidity , which is above the relative humidity of the ambient air.
- a cooling liquid with more than 0 0 C, preferably 4 0 C in the evaporator the evaporator operates at temperatures above 0 0 C, whereby no moisture is bound to the evaporator and thus this of the air is not removed.
- water is used as the cooling liquid for cooling the air.
- Water is a biologically totally unthinkable material, which is also available substantially everywhere and relatively inexpensively.
- the cooling air is cooled to a temperature of 10-18 0 C, preferably to 13-15 0 C. In this area, a very long shelf life of the food is achieved.
- the relative humidity of the cooling air is advantageously 10-30% above the relative humidity of the ambient air.
- the advantage of the present method is that to increase the humidity no active contribution of moisture must be made, but this is done automatically by the appropriate dimensioning of the evaporator.
- the temperature of the cooling air and / or the ambient air as well as the humidity of the cooling air and / or the ambient air can be measured with corresponding sensors. This can serve on the one hand for quality control or for controlling the cooling.
- the moisture of the cooling air can be measured before entering the evaporator and after leaving the evaporator and, for example, if an alarm is triggered, if certain limit values are exceeded.
- the delivery of the cooling liquid can be regulated as a function of the temperature of the cooling air and / or the temperature of the ambient air and / or the humidity of the cooling air and / or the humidity of the ambient air.
- the cooling can be changed and thus the energy requirement can be reduced to a minimum.
- the speed of the cooling air can be regulated as a function of the temperature of the cooling air and / or the temperature of the ambient air and / or the humidity of the cooling air and / or the humidity of the ambient air. It is a goal to keep the cooling air velocity as low as possible, on the one hand to reduce the energy consumption and on the other hand to keep the occurring to a certain extent dehumidification of the food low.
- the speed of the cooling air is preferably achieved by changing the speed of the fans.
- the inlet temperature of the coolant of the evaporator is also measured with corresponding sensors.
- the heat dissipation can be stopped, which can be done for example by closing a valve in the Senkundärniklauf the heat exchanger.
- the temperature of the cooling liquid can not continue to decrease.
- icing of the evaporator and removal of atmospheric moisture by moisture precipitation on the evaporator is prevented.
- Further monitoring can be carried out by measuring the flow of the cooling liquid through the evaporator with the aid of a sensor.
- the second object according to the invention is achieved by a presentation rack mentioned above in which a liquid-cooled evaporator is used, the inlet temperature of the liquid coolant of the evaporator being more than 0 ° C., preferably 4 ° C., and the relative humidity of the cooling air above the relative humidity of the ambient air.
- the liquid coolant is water educated. As already mentioned above, water is relatively cheap and is generally available everywhere and biologically harmless.
- the temperature of the cooling air is 10-18 0 C, preferably 13-15 ° C.
- the relative humidity of the cooling air is advantageously 10-30% more than the relative humidity of the ambient air, in order to prevent the food from drying out and thus to extend the shelf life.
- sensors for measuring the temperature of the cooling air and / or the surrounding air and for measuring the humidity of the cooling air and / or the ambient air can be provided.
- Such sensors can be designed in various ways and on the one hand serve for monitoring for the purpose of quality control or be used as an input signal of a control circuit for controlling the cooling.
- a control device may be provided, which is provided with a pump for circulating the cooling liquid and with a sensor for measuring the temperature of the cooling air and / or a sensor for measuring the temperature of the ambient air and / or a sensor for measuring the humidity of the cooling air and / or a sensor for measuring the humidity of the Umbegungs Kunststoff is connected.
- the circulation pump of the cooling liquid can be controlled differently, whereby the cooling can be increased or reduced.
- a control device which with the at least one fan for conveying the cooling air and with a sensor for measuring the temperature of the cooling air and or or a sensor for measuring the temperature of the ambient air and / or a sensor for measuring the Moisture of the cooling air and or or a sensor for measuring the humidity of the ambient air is connected.
- a sensor for measuring the inlet temperature of Coolant be provided in the evaporator. This can ensures ge that the evaporator at temperatures above 0 0 C, preferably at 4 0 C operates, and thus no withdrawal of humidity takes place from the air.
- the sensor for measuring the entrance temperature of thedethe ⁇ ness may be connected to a valve in the secondary circuit of the Vietnamese ⁇ exchanger so that the heat dissipation in the case of falling below the inlet temperature below a predetermined value, in particular below 4 0 C, can be stopped.
- At least one sensor for measuring the flow of the cooling liquid can be provided in order, for example, to be able to display the correct operation of the cooling rack and, on the other hand, to output an alarm if the limit values are undershot or exceeded.
- the rear wall of the presentation rack can be double-shelled, the cooling air entering the channel from below after exiting the evaporator and exiting through the outlet openings above the trays for cooling the food arranged on the trays.
- the outlet openings can be formed by pipes arranged side by side, which for example have honeycomb-shaped cross sections.
- a laminar air flow is achieved which ensures cooling of even the foremost foods on the ground, even on particularly long shelves, and on the other hand entrains as little warm ambient air as possible, which would require increased energy expenditure for cooling the air.
- the outlet openings can be made inclined. Frequently, the bottoms of the presentation shelves are also inclined forwardly. In this case, the inclination angle of the outlet opening is advantageous to the Slope of the floor of the presentation rack adjusted.
- the outlet openings can also have adjustable inclination.
- means for guiding the cooling air can be provided.
- Such baffles or the like serve for branching of partial air flows in the direction of the outlet, so that even several superposed floors of the presentation rack can be sufficiently supplied with cooling air.
- the rear wall may have a thermal insulation of suitable material.
- the water from the heat exchanger to the evaporator lines are provided, which may be formed, for example, of copper or plastic.
- a thermal insulation can be provided from suitable material.
- the coolant lines can be provided with a corresponding connection.
- a connection for the cooling liquid in particular for water, can be formed by a conventional plug connection, to which, for example, a water hose can be connected in order to be able to fill water into the cooling circuit.
- side walls may be provided for lateral delimitation of the presentation shelf, which prevent lateral leakage of the cooling air.
- the at least one fan and the at least one evaporator are arranged at the bottom of the presentation rack. Since the presentation of the food for reasons of convenience can not be made to the bottom of the shelf, this area is particularly suitable for the arrangement of such components. For maintenance and cleaning of the components they should be as easily accessible.
- a removable tray can be arranged on the bottom, which is preferably made of stainless materials, such as plastics. Likewise, the condensation can be absorbed by a channel.
- a sound insulation for the at least one fan can be provided.
- lighting can be arranged on the underside of the shelves of the shelf.
- the electrical connection of the lighting devices can be done by connectors that allow rapid assembly and disassembly.
- FIG. 1 shows a sectional side view of an embodiment of a presentation rack
- FIG. 2 shows the plan view of the presentation rack according to FIG. 1 as seen by the customer
- FIG. 3 shows a schematic block diagram of the air cooling contained in the presentation rack according to the invention.
- Fig. 1 shows a sectional view of an embodiment of a presentation shelf 1 for food 2, especially for fruits and vegetables.
- a plurality of trays 4 for receiving the food 2 are angeord ⁇ net on a rear wall 3 in a conventional manner.
- the rear wall 3 is connected ver ⁇ with a corresponding shelf extension 5 with feet 6.
- a closure 7 may be arranged in the form of a roof.
- the cooling of the food 2 is carried out via cooling air K, which ge leads over the food 2, which has been indicated schematically by the dashed line and the arrows.
- the cooling air K is conveyed by at least one fan 7, which may be located in the lower area between the shelf extension arms 5.
- the fan 7 may be provided to reduce the noise with a sound insulation.
- the cooling air K is ge blown by an evaporator 8, the ⁇ the temperature T of the cooling air lowers K to appropriate values.
- the Sekundär ⁇ circle of the heat exchanger 9 is connected via corresponding Kälte ⁇ medium lines (not shown) connected to a cooling unit, which is not normally arranged in the presentation rack 1 and may be formed in various ways.
- the rear wall 3 is preferably designed to be soundproofed to form a channel 10.
- a corresponding thermal insulation 11 may be provided on the rear wall 3.
- the cooling air K enters after leaving the evaporator 8 from below into the channel 10 in the rear wall 3 and leaves this channel 10 through corresponding outlet openings 12, which are arranged above the trays 4.
- guide devices 13, for example baffles or the like can be arranged.
- a cooling liquid, in particular water is used, which is arranged by appropriate lines (not shown) to a pump 14, which is preferably arranged in the upper area of the presentation area 1 and to the heat exchanger 9 to remove the heat be guided.
- Lighting body 15 may preferably be arranged on the underside of the bottoms 4.
- FIG. 2 shows a plan view of the presentation shelf 1 from the perspective of the consumer. For better clarity, the floors 4 and 7 were not shown.
- the rear wall 3 has outlet openings 12 for the cooling air K, which may be formed, for example, in the form of juxtaposed tubes 16, for example with a honeycomb-shaped cross section, in order to achieve a laminar flow of the cooling air K.
- the presentation shelf 1 is laterally limited preferably by side walls 18, 19.
- FIG. 3 shows a schematic block diagram of the device for cooling and humidifying the food in the presentation rack 1.
- the block diagram shows a total of four evaporators 8, through which the air K for cooling the food 2 is blown by means of fans 7.
- a cooling liquid in particular water
- the cooling liquid lines 20 are preferably provided with a heat insulation 21.
- the cooling liquid is passed from the evaporator 8 via a pump 14 to a heat exchanger 9 for discharging the heat and from this heat exchanger 9 back to the evaporators 8.
- a connection 22 can be connected to the lines 20, via which the cooling liquid, in particular the water, can be topped up.
- the evaporator 8 are formed so that the temperature T E manufacturedstem ⁇ comprises the cooling liquid above 0 0 C, preferably 4 0 C.
- a Aus ⁇ equalizing tank 23 may be arranged with a compensation valve 24.
- a refrigerant via corresponding lines 25, 26 to a ent speaking cooling unit (not shown) out, which may be designed in various ways.
- the coolant lines 25, 26 are preferably equipped with corresponding connection elements 27, 28.
- a corresponding sensor 29 may be provided to Measurement of the inlet temperature T E of the cooling liquid at the inlet of the evaporator 8.
- the further heat dissipation can be stopped by the heat exchanger 9 by a solenoid valve 30 is actuated in the coolant line 25.
- a flow sensor 31 can be arranged in the line 20.
- the temperature T ⁇ 11 of ambient air and the atmospheric humidity F ⁇ the cooling air K and the humidity F 0 of the ambient air can be also placed at appropriate locations sensors sake of clarity, not ein ⁇ are drawn.
- a corresponding control device 32 which can be connected, for example, to the fans 7 and / or the pump 14 and the temperature sensors, regulation of the cooling of the food 2 is possible.
- the evaporator 8 by operating the evaporator 8 with a cooling liquid, in particular water, with a temperature in the range above 0 0 C, in particular at 4 0 C, achieved that the evaporator 8 of the cooling air K no moisture extracts, but it by cooling the cooling air K even increases the humidity of the cooling air K comes. Thus, a much higher durability of the food 2 is achieved.
- a cooling liquid in particular water
- the used evaporator 8 has the following technical data:
- Inlet temperature of the cooling liquid (water) 4 ° C.
- the temperature in the refrigerated shelf in the range between 9.6 and 13 ° C
- the temperature in the uncooled shelf was between 18.1 and 21.1 ° C.
- the air humidity in the cooled rack was between 80.2 and 99.2%, while in the uncooled rack only values of relative humidity between 60.3 and 83.1% could be recorded. While some of the tested fruits and vegetables were already spoiled after one day, with the presentation rack according to the invention the shelf life could be increased to 99 hours.
- the present invention therefore shows a process for the preservation of foodstuffs, in particular fruit and vegetables, and a presentation rack for foods, in particular for fruits and vegetables, by which the shelf life of the foodstuffs is many times greater in a particularly simple and cost-effective manner can be increased compared to today's methods.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05706214A EP1809145A1 (en) | 2004-11-05 | 2005-03-08 | Method for preserving food and presentation shelf for food |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA1849/2004 | 2004-11-05 | ||
AT18492004A AT500980B1 (en) | 2004-11-05 | 2004-11-05 | METHOD FOR MAINTAINING FOODSTUFFS AND PRESENTING RULES FOR FOODSTUFFS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006047797A1 true WO2006047797A1 (en) | 2006-05-11 |
Family
ID=34956442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2005/000077 WO2006047797A1 (en) | 2004-11-05 | 2005-03-08 | Method for preserving food and presentation shelf for food |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1809145A1 (en) |
CN (1) | CN101098646A (en) |
AT (1) | AT500980B1 (en) |
WO (1) | WO2006047797A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008064784A1 (en) * | 2006-12-01 | 2008-06-05 | Liebherr-Hausgeräte Ochsenhausen GmbH | Refrigerator and/or freezer with a magnetic cooler |
WO2008110180A1 (en) * | 2007-03-09 | 2008-09-18 | Carrier Corporation | Refrigerated sales furniture and refrigerated sales system comprising the same |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696630A (en) * | 1970-12-10 | 1972-10-10 | Tony J Bressickello | Humidified and refrigerated showcase |
US4248061A (en) * | 1979-05-21 | 1981-02-03 | Effa Etudes | Thermostatically and hygrostatically controlled cabinet for storing foodstuffs and other particularly delicate products |
US4272969A (en) * | 1977-02-03 | 1981-06-16 | Fernand Schwitzgebel | Method for refrigerating fresh products and keeping them fresh, as well as refrigerator for carrying out this method |
DE8524577U1 (en) | 1985-08-28 | 1986-04-03 | TYLER Refrigeration GmbH, 6250 Limburg | Climate shelf for sales purposes |
US5315837A (en) | 1992-02-04 | 1994-05-31 | M. C. International | Process for supplying cold to an open refrigerated enclosure for display and sale of fresh products in a supermarket |
US5317881A (en) | 1990-01-19 | 1994-06-07 | Colbrook Equipment Limited | Apparatus for displaying material under refrigerated conditions |
US5440894A (en) | 1993-05-05 | 1995-08-15 | Hussmann Corporation | Strategic modular commercial refrigeration |
US5477702A (en) | 1993-01-24 | 1995-12-26 | Noble Australia Pty. Ltd. | Refrigerated display cabinet |
DE19529524A1 (en) * | 1995-08-11 | 1996-01-18 | Klaus Haendel | Cooling plate for display of perishable foodstuffs |
DE19828306A1 (en) | 1998-06-25 | 1999-12-30 | Bae Ro Gmbh & Co Kg | Fresh fruit and vegetables are preserved on a shelf especially a shop shelf |
US6390378B1 (en) | 1999-02-02 | 2002-05-21 | Ca Global Express, Llc | Centralized humidification controlled container system for transporting and holding perishable goods |
US20020062654A1 (en) | 1998-06-12 | 2002-05-30 | Navarro Ramon Munoz | Air curtain for open-fronted refrigerated showcase |
EP1304061A1 (en) * | 2000-07-21 | 2003-04-23 | Hoeg Exportaciones, S.A. | Method for preserving perishable products, especially flowers, fruits and vegetables, and corresponding device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH527590A (en) * | 1971-04-16 | 1972-09-15 | Graf Heinrich | Method for cooling a refrigerated display case and for simultaneously increasing the relative humidity in the same and refrigerated display case for carrying out the method |
DE10111430A1 (en) * | 2001-03-09 | 2002-09-19 | Linde Ag | Supplying cold rooms with cold ambient air involves feeding ambient air to cooled furniture and/or chambers depending on temperature and/or humidity of ambient air and/or internal air |
-
2004
- 2004-11-05 AT AT18492004A patent/AT500980B1/en not_active IP Right Cessation
-
2005
- 2005-03-08 WO PCT/AT2005/000077 patent/WO2006047797A1/en active Application Filing
- 2005-03-08 CN CNA2005800459204A patent/CN101098646A/en active Pending
- 2005-03-08 EP EP05706214A patent/EP1809145A1/en not_active Withdrawn
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696630A (en) * | 1970-12-10 | 1972-10-10 | Tony J Bressickello | Humidified and refrigerated showcase |
US4272969A (en) * | 1977-02-03 | 1981-06-16 | Fernand Schwitzgebel | Method for refrigerating fresh products and keeping them fresh, as well as refrigerator for carrying out this method |
US4248061A (en) * | 1979-05-21 | 1981-02-03 | Effa Etudes | Thermostatically and hygrostatically controlled cabinet for storing foodstuffs and other particularly delicate products |
DE8524577U1 (en) | 1985-08-28 | 1986-04-03 | TYLER Refrigeration GmbH, 6250 Limburg | Climate shelf for sales purposes |
US5317881A (en) | 1990-01-19 | 1994-06-07 | Colbrook Equipment Limited | Apparatus for displaying material under refrigerated conditions |
US5315837A (en) | 1992-02-04 | 1994-05-31 | M. C. International | Process for supplying cold to an open refrigerated enclosure for display and sale of fresh products in a supermarket |
US5477702A (en) | 1993-01-24 | 1995-12-26 | Noble Australia Pty. Ltd. | Refrigerated display cabinet |
US5440894A (en) | 1993-05-05 | 1995-08-15 | Hussmann Corporation | Strategic modular commercial refrigeration |
DE19529524A1 (en) * | 1995-08-11 | 1996-01-18 | Klaus Haendel | Cooling plate for display of perishable foodstuffs |
US20020062654A1 (en) | 1998-06-12 | 2002-05-30 | Navarro Ramon Munoz | Air curtain for open-fronted refrigerated showcase |
DE19828306A1 (en) | 1998-06-25 | 1999-12-30 | Bae Ro Gmbh & Co Kg | Fresh fruit and vegetables are preserved on a shelf especially a shop shelf |
US6390378B1 (en) | 1999-02-02 | 2002-05-21 | Ca Global Express, Llc | Centralized humidification controlled container system for transporting and holding perishable goods |
EP1304061A1 (en) * | 2000-07-21 | 2003-04-23 | Hoeg Exportaciones, S.A. | Method for preserving perishable products, especially flowers, fruits and vegetables, and corresponding device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008064784A1 (en) * | 2006-12-01 | 2008-06-05 | Liebherr-Hausgeräte Ochsenhausen GmbH | Refrigerator and/or freezer with a magnetic cooler |
WO2008110180A1 (en) * | 2007-03-09 | 2008-09-18 | Carrier Corporation | Refrigerated sales furniture and refrigerated sales system comprising the same |
Also Published As
Publication number | Publication date |
---|---|
AT500980A1 (en) | 2006-05-15 |
CN101098646A (en) | 2008-01-02 |
EP1809145A1 (en) | 2007-07-25 |
AT500980B1 (en) | 2007-01-15 |
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