WO1982001812A1 - A method in the operation of a refrigerated display unit - Google Patents
A method in the operation of a refrigerated display unit Download PDFInfo
- Publication number
- WO1982001812A1 WO1982001812A1 PCT/DK1981/000106 DK8100106W WO8201812A1 WO 1982001812 A1 WO1982001812 A1 WO 1982001812A1 DK 8100106 W DK8100106 W DK 8100106W WO 8201812 A1 WO8201812 A1 WO 8201812A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- display unit
- fan
- refrigerated display
- unit
- timetable
- 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
- A47F3/0478—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.
- the cold zone of the refrigerated display unit is normally closed off from the warm zone of the shop, e.g. by means of insulating plates, foil or pull-down curtains.
- 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 air temperature 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 stated in claim 3.
- the simplest regulation is obtained when start and stop take place at intervals, as stated in claim 4, and when the on and off periods are independently adjustable, as stated in claim 5.
- 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.
- a bottom chamber 16 defined between the bottom wall of the shelf assembly and a base plate 17 is fitted 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 thermo stat 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 it is also possible to control the timer 32 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.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81903266T ATE13483T1 (en) | 1980-12-01 | 1981-11-30 | METHOD OF OPERATING A REFRIGERATED SHOWCASE. |
DE8181903266T DE3170773D1 (en) | 1980-12-01 | 1981-11-30 | A method in the operation of a refrigerated display unit |
FI822645A FI81248C (en) | 1980-12-01 | 1982-07-28 | FOERFARANDE FOER DRIFT AV EN KYLMOEBEL. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK510780A DK159004C (en) | 1980-12-01 | 1980-12-01 | PROCEDURE FOR OPERATING A COOLING FURNITURE |
DK5107/80801201 | 1980-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1982001812A1 true WO1982001812A1 (en) | 1982-06-10 |
Family
ID=8139503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1981/000106 WO1982001812A1 (en) | 1980-12-01 | 1981-11-30 | A method in the operation of a refrigerated display unit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0065555B1 (en) |
DK (1) | DK159004C (en) |
FI (1) | FI81248C (en) |
WO (1) | WO1982001812A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0090431A2 (en) * | 1982-03-31 | 1983-10-05 | The Coca-Cola Company | Energy management system for vending machines |
GB2167579A (en) * | 1984-11-27 | 1986-05-29 | Barker & Co George | Temperature controls of refrigerated cabinets |
EP0527339A1 (en) * | 1991-08-09 | 1993-02-17 | GETA Gesellschaft für Energietechnik und -Anwendung mbH | Thermal insulating cover on refrigerated chests, especially deep-freezing chests |
EP0881443A1 (en) | 1997-05-27 | 1998-12-02 | Urs Künzle | Power saving circuit for mains operated refrigeration apparatus and control method thereof |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9001225D0 (en) * | 1990-01-19 | 1990-03-21 | Colbrook Equipment Ltd | Refrigerated food display apparatus |
EP3745926B1 (en) * | 2018-02-02 | 2022-10-12 | Carrier Corporation | Refrigerated sales cabinet |
Citations (6)
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 (en) * | 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 |
DE3002778A1 (en) * | 1979-02-02 | 1980-08-14 | Tyler Refrigeration Corp | REFRIGERATOR AND METHOD FOR THEIR OPERATION |
-
1980
- 1980-12-01 DK DK510780A patent/DK159004C/en not_active IP Right Cessation
-
1981
- 1981-11-30 EP EP19810903266 patent/EP0065555B1/en not_active Expired
- 1981-11-30 WO PCT/DK1981/000106 patent/WO1982001812A1/en active IP Right Grant
-
1982
- 1982-07-28 FI FI822645A patent/FI81248C/en not_active IP Right Cessation
Patent Citations (6)
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 (en) * | 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 |
DE3002778A1 (en) * | 1979-02-02 | 1980-08-14 | Tyler Refrigeration Corp | REFRIGERATOR AND METHOD FOR THEIR OPERATION |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0090431A2 (en) * | 1982-03-31 | 1983-10-05 | The Coca-Cola Company | Energy management system for vending machines |
EP0090431A3 (en) * | 1982-03-31 | 1984-05-09 | The Coca-Cola Company | Energy management system for vending machines |
GB2167579A (en) * | 1984-11-27 | 1986-05-29 | Barker & Co George | Temperature controls of refrigerated cabinets |
EP0527339A1 (en) * | 1991-08-09 | 1993-02-17 | GETA Gesellschaft für Energietechnik und -Anwendung mbH | Thermal insulating cover on refrigerated chests, especially deep-freezing chests |
EP0881443A1 (en) | 1997-05-27 | 1998-12-02 | Urs Künzle | Power saving circuit for mains operated refrigeration apparatus and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
FI822645A0 (en) | 1982-07-28 |
EP0065555A1 (en) | 1982-12-01 |
DK159004C (en) | 1991-01-28 |
FI822645L (en) | 1982-07-28 |
FI81248B (en) | 1990-06-29 |
DK510780A (en) | 1982-06-02 |
EP0065555B1 (en) | 1985-05-29 |
FI81248C (en) | 1990-10-10 |
DK159004B (en) | 1990-08-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5355686A (en) | Dual temperature control of refrigerator-freezer | |
KR100351210B1 (en) | Cooling device and method of operation thereof | |
US7942014B2 (en) | Reduced energy refrigerator defrost method and apparatus | |
US4537041A (en) | Refrigerator having temperature-responsive control means for combined direct and fan-cooled operation | |
US3786648A (en) | Cooling system with multiple evaporators | |
GB2145208A (en) | Refrigeration system | |
US4332142A (en) | Household refrigerator including anti-sweat heater control circuit | |
US3084519A (en) | Two temperature forced air refrigerator systems | |
EP0065555B1 (en) | A method in the operation of a refrigerated display unit | |
EP0511251B1 (en) | Apparatus for displaying material under refrigerated conditions | |
US4358933A (en) | Household refrigerator defrost system | |
US3126717A (en) | Forced air cooled refrigerator | |
US3105364A (en) | Refrigerating apparatus with defrost means | |
US3899896A (en) | Automatic defrosting control system | |
US2962872A (en) | Refrigerator construction and controls | |
EP1074802B1 (en) | Refrigerator with compartment for the quick cooling of food | |
JPS6157546B2 (en) | ||
ITMI962475A1 (en) | REFRIGERATOR STRUCTURE WITH VARIABLE FORCED VENTILATION | |
US2975619A (en) | Refrigerator with meat storage receptacle | |
US7096682B2 (en) | Refrigeration device and operating method for a refrigeration device | |
JP2567764B2 (en) | High humidity cooling storage | |
US3675438A (en) | Refrigerator with fluid amplifier means | |
JPH05126458A (en) | High-humidity cooling/storing device | |
GB2348947A (en) | Defrost control method and apparatus | |
EP1111317B1 (en) | Refrigerator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Designated state(s): AT CH DE FI GB NL SE US |
|
AL | Designated countries for regional patents |
Designated state(s): AT CH DE FR GB NL SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1981903266 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 822645 Country of ref document: FI |
|
WWP | Wipo information: published in national office |
Ref document number: 1981903266 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1981903266 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWG | Wipo information: grant in national office |
Ref document number: 822645 Country of ref document: FI |