EP0065555B1 - Procede de fonctionnement d'une vitrine d'exposition refrigeree - Google Patents

Procede de fonctionnement d'une vitrine d'exposition refrigeree Download PDF

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Publication number
EP0065555B1
EP0065555B1 EP19810903266 EP81903266A EP0065555B1 EP 0065555 B1 EP0065555 B1 EP 0065555B1 EP 19810903266 EP19810903266 EP 19810903266 EP 81903266 A EP81903266 A EP 81903266A EP 0065555 B1 EP0065555 B1 EP 0065555B1
Authority
EP
European Patent Office
Prior art keywords
display unit
fan
refrigerated display
refrigerated
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19810903266
Other languages
German (de)
English (en)
Other versions
EP0065555A1 (fr
Inventor
Bent Overgaard
Finn Guldager Christensen
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.)
KNUDSEN KOLING AS
Original Assignee
KNUDSEN KOLING AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KNUDSEN KOLING AS filed Critical KNUDSEN KOLING AS
Priority to AT81903266T priority Critical patent/ATE13483T1/de
Publication of EP0065555A1 publication Critical patent/EP0065555A1/fr
Application granted granted Critical
Publication of EP0065555B1 publication Critical patent/EP0065555B1/fr
Expired legal-status Critical Current

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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
    • A47F3/0478—Control or safety arrangements

Definitions

  • the invention relates to a method of the type defined in the introductory portion of claim 1.
  • the refrigerated display unit may e.g. be a refrigerated or freezer display counter or shelf assembly of the type used in provision shops for storing and displaying provisions.
  • a refrigerator having two or more separate channel systems in which air is circulated by means of fans.
  • the air circulation pattern may be changed by means of throttle valves or additional fans so as to circulate warm room air.
  • a signal for initiating the change may be derived from a temperature or air velocity sensing device placed in the channel system.
  • the operating time of the compressor may be reduced by closing off the cold zone of the refrigerated display unit, e.g. by means of insulating, foil or pull-down curtains, during the periods when the goods in the display unit are not to be accessible to the public, i.e. in the non-business hours of the shop.
  • This cover reduces incident radiation and infiltration of air from the surroundings so much that the temperature of the goods in the refrigerated display unit falls, even if the airtemeprature in the refrigerated display unit is kept constant. As far as refrigerated goods are concerned this may involve a risk of freeze damage.
  • a thermostat and/or a pressostat is used for controlling the temperature in the refrigerated display unit. These means ensure that the compressor connected to the refrigerated display unit only operates as long as the thermostat and/or the pressostat applies a signal that cooling is needed in the refrigerated display unit. If a thermostat is used, which is normally the case, the sensor of the thermostat is placed in the flow of circulating air in the refrigerated display unit. If the temperature in the refrigerated display unit is above the value set on the thermostat, the thermostat applies a cooling signal, and this signal may either directly start the compressor or open a magnet valve in the liquid line of the cooling system, which causes the pressostat to start the compressor.
  • the compressor thermostat might also be used for controlling the circulation fan so that both the compressor and the fan would operate when cooling was needed, and both members would be inoperative when no cooling was needed.
  • the sensor of the thermostat is fitted adjacent the evaporator, usually in the inlet air of the evaporator. If the thermostat stops the compressor and the fan, a cold zone will be formed around the evaporator and the thermostat sensor, which means that it will take too long before the thermostat again applies a start signal to the compressor.
  • Another possibility of controlling the air temperature consists in fitting an additional thermostat in the flow of circulating air for the control of the fan. The sensor of this thermostat would then have to be placed at the point where the highest temperature would occur when the fan was inoperative.
  • Such a system comprises two thermostats to be set when the temperature level in the refrigerated display unit is to be changed. If the fan control thermostat is inadvertently not set, the danger exists that the fan either operates all the time or, at worst, is inoperative all the time.
  • the object of the invention is to provide a method of the type described which permits energy savings for the operation of the circulation fan in the non-business hours while preventing detrimental supercooling of the goods in the refrigerated display unit.
  • the regulation of the operating period of fan thus established also reduces the consumption of energy for the operation of the compressor, because the heat supplied by the fan in the refrigerated display unit decreases so that the operating period of the compressor is reduced.
  • the timetable should be variable as statsd in claim 3.
  • the on and off periods can be set manually on an empirical basis, but when they are controlled by their respective temperature sensors or the same temperature sensor, as stated in claim 6, the temperature at one or more control points will with certainty never exceed a predetermined value.
  • Switching of the refrigerated display unit from constant to intermittent operation of the circulation fan and vice versa can take place manually; but it is also possible to effect it automatically by establishing and removing, respectively, the cover, as stated in claim 7.
  • Mounting and dismounting of the cover can be recorded in many ways, e.g. mechanically, capacitively or inductively or by means of a photocell. The same recording means can also be employed to control the defrosting of the refrigerated display unit, if desired.
  • the drawing shows the use of the invention in connection with a refrigerated shelf assembly which is shown in a vertical cross-section and is generally designated by 10.
  • the shelf assembly forms a box which is closed at all sides except at the front side, from which the goods stored on the shelves are accessible through an opening defined by the lower edge of an upper front wall member 11 and the upper edge of a lower front wall member 12.
  • a flange 13 is placed on the top wall of the shelf assembly at some distance from and parallel with the front wall member 11, and fittings for fluorescent tubes 14 are placed between this flange and the front wall.
  • a removable cover plate 15 is mounted, extending from the lower edge of the flange 13 to the upper edge of the lower front wall member 12. This cover plate is mounted after business hours to reduce reception of heat from the surroundings and is removed again before the shop opens.
  • an evaporator 18 which forms part of a cooling system of an ordinary known type.
  • a fan 19 likewise mounted in the bottom chamber 16 draws air across the evaporator to cool the air and presses it up through a channel 20, which is defined between a rear plate 21 and the rear wall of the shelf assembly and from which the cold air is guided towards the front side of the shelf assembly through another channel 22, defined between the top wall of the shelf assembly and an upper plate 23, and is then guided down to the bottom and finally through a gap 24 between the front wall of the shelf assembly and the front edge of the base plate 13.
  • the path of the circulating air is indicated by arrows.
  • the rear plate 21 may optionally be perforated so that air sub-flows can pass from the channel 16 across goods on shelves 25 attached to the rear plate.
  • a heater wire 34 On the lower edge of the flange 13 where the cold air from the evaporator meets warm air from the outside, may be arranged a heater wire 34 in conventional manner which serves to prevent condensation of moisture in the warm air.
  • the liquid line of the cooling system has inserted in it a magnet valve 26 in whose electric supply circuit a switch 27 is inserted which is controlled by a thermostat 28 whose sensor 29 is placed in the bottom chamber 16 in front of the evaporator 18.
  • the magnet valve 26 controls in conventional manner the start and stop of the not shown compressor of the cooling system in dependence upon the air temperature in the refrigerated shelf assembly.
  • the electric supply circuit of the fan 19 and the heater wire 34 has inserted therein a switch 30 which serves to switch from continuous operation of the fan and the heater wire in the business hours of the shop when the cover plate 15 is removed, to intermittent fan and heater wire operation in the non-business hours when the cover plate 15 is mounted as shown.
  • the switch 30 is shown in an open position corresponding to intermittent operation.
  • the supply of power to the fan is controlled by another switch 31 which is connected in parallel with the switch 30 and is actuated by a timer 32.
  • the timer is in conventional manner adapted to close the switch 31 and keep it closed for a specific period of time and then to open the switch and keep it open for another specific period of time, etc., and both periods of time can be varied independently of each other.
  • the timer can thus be set manually on an empirical basis to connect and disconnect the supply of power to the fan and the heater wire at intervals with such on and off periods as will keep the air temperature in the refrigerated shelf assembly at the desired level.
  • the timer 32 can be controlled automatically in dependence upon the air temperature at a control point in the refrigerated shelf assembly by means of a temperature sensor 33 which is arranged at this point and is connected to the timer as shown by a dashed line.
  • the temperature sensor may e.g. be a temperature dependent resistor whose resistance is determined by the on and/or off period of the timer. There may also be provided a special temperature sensor for the control of each of these periods.
  • the switch 30 may be adapted to be actuated automatically on mounting and dismounting of the cover plate.

Claims (7)

1. Procédé de fonctionnement d'une vitrine d'exposition réfrigérée comprenant un organe de réfrigération et au moins un ventilateur pour faire circuler de l'air derrière l'organe de réfrigération dans la vitrine, et comportant un couvercle pour isoler l'intérieur de la vitrine de l'environnement pendant les heures de fermeture où l'accès à la marchandise stockée dans la virtine n'est pas nécessaire, caractérisé en ce que le ventilateur, dans les heures de fermeture, est automatiquement enclenché et déclenché selon un horaire prédéterminé afin de maintenir la température de l'air dans la vitrine réfrigérée au niveau désiré.
2. Procédé selon la revendication 1, pour le fonctionnement d'une vitrine d'exposition réfrigérée comprenant un ou plusieurs filaments de chauffage pour agir contre la condensation, caractérisé en ce que l'alimentation du ou des filaments est également enclenchée et déclenchée automatiquement selon l'horaire prédéterminé.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'horaire est variable.
4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que la marche et l'arrêt se font à des intervalles.
5. Procédé selon la revendication 4, caractérisé en ce que les périodes de marche et d'arrêt sont ajustables indépendamment l'une de l'autre.
6. Procédé selon la revendication 5, caractérisé en ce que les périodes de marche et/ou d'arrêt sont réglées par leurs sondes de température respectives ou par la même sonde thermométrique.
7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la commutation de l'opération continue en opération intermittente du ventilateur et vice versa est effectuée automatiquement par l'application et l'enlèvement du couvercle, respectivement.
EP19810903266 1980-12-01 1981-11-30 Procede de fonctionnement d'une vitrine d'exposition refrigeree Expired EP0065555B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81903266T ATE13483T1 (de) 1980-12-01 1981-11-30 Verfahren zum betreiben eines gekuehlten schaukastens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK5107/80 1980-12-01
DK510780A DK159004C (da) 1980-12-01 1980-12-01 Fremgangsmaade ved drift af et koelemoebel

Publications (2)

Publication Number Publication Date
EP0065555A1 EP0065555A1 (fr) 1982-12-01
EP0065555B1 true EP0065555B1 (fr) 1985-05-29

Family

ID=8139503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810903266 Expired EP0065555B1 (fr) 1980-12-01 1981-11-30 Procede de fonctionnement d'une vitrine d'exposition refrigeree

Country Status (4)

Country Link
EP (1) EP0065555B1 (fr)
DK (1) DK159004C (fr)
FI (1) FI81248C (fr)
WO (1) WO1982001812A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417450A (en) * 1980-10-17 1983-11-29 The Coca-Cola Company Energy management system for vending machines
GB8429904D0 (en) * 1984-11-27 1985-01-03 Barker George & Co Ltd Temperature controls of refrigerated cabinets
GB9001225D0 (en) * 1990-01-19 1990-03-21 Colbrook Equipment Ltd Refrigerated food display apparatus
DE9204640U1 (fr) * 1991-08-09 1992-12-03 Geta Gesellschaft Fuer Energietechnik Und -Anwendung Mbh, 5342 Rheinbreitbach, De
EP0881443A1 (fr) 1997-05-27 1998-12-02 Urs Künzle Circuit économiseur pour appareil frigorifique alimenté par secteur et procédé de commande de ce circuit
WO2019149366A1 (fr) * 2018-02-02 2019-08-08 Carrier Corporation Armoire commerciale réfrigérée

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186185A (en) * 1963-01-03 1965-06-01 Mccray Refrigerator Company In Refrigerated display unit
US3269787A (en) * 1963-10-15 1966-08-30 Studebaker Corp Refrigeration cabinet
FR1574028A (fr) * 1968-04-04 1969-07-11
US3545218A (en) * 1968-09-20 1970-12-08 Gerald B Greenberg Thermostatic control for air conditioning system
US4094166A (en) * 1977-03-23 1978-06-13 Electro-Thermal Corporation Air conditioning control system
US4302946A (en) * 1979-02-02 1981-12-01 Tyler Refrigeration Corporation Refrigeration system using air defrost

Also Published As

Publication number Publication date
FI81248C (fi) 1990-10-10
DK159004C (da) 1991-01-28
FI81248B (fi) 1990-06-29
DK510780A (da) 1982-06-02
WO1982001812A1 (fr) 1982-06-10
FI822645L (fi) 1982-07-28
EP0065555A1 (fr) 1982-12-01
FI822645A0 (fi) 1982-07-28
DK159004B (da) 1990-08-20

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