EP1334321B1 - A defrosting method and a refrigeration appliance using thereof - Google Patents
A defrosting method and a refrigeration appliance using thereof Download PDFInfo
- Publication number
- EP1334321B1 EP1334321B1 EP00978196A EP00978196A EP1334321B1 EP 1334321 B1 EP1334321 B1 EP 1334321B1 EP 00978196 A EP00978196 A EP 00978196A EP 00978196 A EP00978196 A EP 00978196A EP 1334321 B1 EP1334321 B1 EP 1334321B1
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- EP
- European Patent Office
- Prior art keywords
- evaporator
- fresh food
- sub
- evaporators
- refrigerant
- 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 - Lifetime
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/021—Alternate defrosting
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/05—Compression system with heat exchange between particular parts of the system
- F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part of the refrigeration cycle
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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
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
- F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
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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
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
- F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
- F25D2317/0682—Two or more fans
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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
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
Definitions
- the present invention relates to a refrigeration appliance having multiple refrigeration compartments and a method for defrosting such a refrigeration appliance.
- a typical refrigeration appliance has two separate compartments which are kept at different temperatures, at least a compressor for supplying refrigerant, and one or more evaporators over which the warm air from the compartments is circulated by means of fan.
- Fan draws the warmer air from the compartments and circulates it over the evaporator surfaces, and deliver colder air to the compartments. Circulation of warm air over the evaporators results in accumulation of frost on the evaporator, and decreases the efficiency of the refrigerator. Therefore, frost is melted periodically during a defrost cycle.
- the compressor stops and a heat source is activated.
- a heat source is a resistant heater.
- Use of resistant heaters increases energy consumption.
- efficiency of defrosting with resistant heaters are generally very low, around 30%, that means most of the energy is consumed for heating the cabinet instead of melting the frost.
- the object of this invention is to provide a method for efficiently defrosting a refrigeration appliance and a refrigeration appliance using thereof.
- a typical refrigeration appliance cooled with the circulation of a refrigerant having multiple refrigeration compartments, specifically a fresh food compartment (18) and a freezer compartment (17), comprises a compressor (1) for pressurizing the refrigerant vapour to increase the pressure and temperature of the refrigerant, a condenser (2) for condensing the refrigerant, a filter-dryer (3) for capturing the moisture and impurities of the refrigerant, a capillary tube (4) for decreasing the pressure and thus the temperature of the refrigerant, a suction line heat exchanger (5), a fresh food evaporator (20) for cooling the fresh food compartment (18) and a fresh food fan (9) for circulating air over the fresh food evaporator (20), a freezer evaporator (6) for cooling the freezer compartment (17) and a freezer fan (7) for circulating air over the freezer evaporator (6) and a suction line (14) for turning the refrigerant back to the compressor (1).
- the fresh food evaporator (20) and the freezer evaporator (6) can be arranged either in series or in parallel. In series arrangement, the refrigerant first circulates through one of the evaporators then through the other , whereas in parallel arrangement, the refrigerant goes through the evaporators independently.
- the compressor (1) In order to cool the compartments (17 and 18), the compressor (1) is turned on and off. If the temperature in the freezer cabinet (17) is high, the compressor (1) and the freezer fan (7) are turned on. While the compressor (1) is on, if the fresh food cabinet (18) temperature is high, the fresh food fan (9) is activated.
- the freezer evaporator (6) and the fresh food evaporator (20) are arranged in series. Therefore, the refrigerant preferably first goes through the fresh food evaporator (20) and then the freezer evaporator (6).
- the fresh food evaporator (20) is composed of more than one sub-evaporator that are arranged in parallel.
- there are two sub-evaporators namely a first sub-evaporator (10) and a second sub-evaporator (11).
- Sub-evaporators (10 and 11) are arranged in parallel and both of the sub-evaporators (10 and 11) are used sequentially for cooling the fresh-food compartment.
- the refrigeration appliance further comprises a separator (12) for isolating the first sub-evaporator (10) and the second sub-evaporator (11) from each other, a solenoid valve (8), preferably a bi-stable valve, for directing the refrigerant to one of the sub-evaporators (10 and 11) and two capillary tubes (4a and 4b) for decreasing the pressure and thus the temperature of the refrigerant that is supplied to the first and second sub evaporators (10 and 11) respectively.
- a solenoid valve (8) preferably a bi-stable valve
- the refrigerant is pressurised by the compressor (1) and fed into the condenser (2).
- refrigerant exchanges heat with the ambient air and condenses.
- Refrigerant then goes through the filter-dryer (3) and the solenoid valve (8) which directs the refrigerant to the preferred sub-evaporator (10 or 11) through the respective capillary (4a or 4b).
- refrigerant After the fresh food evaporator (20), refrigerant goes through the freezer evaporator (6) where freezer cabinet is cooled by means of cold air circulated by freezer fan (7). Then refrigerant goes to the heat exchanger (5) and suction line (14). Refrigerant completes its cycle when it returns to the compressor (1) again.
- refrigerant is directed to one of the sub-evaporators (10 and 11).
- Solenoid valve (8) for a predetermined defrost duration tdef1, directs the refrigerant only to the first sub-evaporator (10).
- frost accumulates only on the first sub evaporator surface (10) in which refrigerant is fed through.
- tdef1 if the fresh food fan (9) is operating, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air helps defrosting of the second sub evaporator (11) which is in rest position i.e. refrigerant is not fed through.
- the predetermined defrost duration is experimentally optimized for allowing the complete defrost of the sub-evaporators (10 or 11). This enables continuous cooling of the fresh food compartment (18) and defrosting of the fresh food evaporator (20) concurrently.
- the sub-evaporators (10 and 11) are isolated with the separator (12) which is preferably made of styrofoam and covered with an aluminium folio which keeps moisture away from the styrofoam material and avoiding hygiene problems.
- the separator (12) does not interfere the airflow, but prevents the air shortcuts between evaporators. Air is always circulated over both of the sub-evaporators (10 and 11) regardless of which one is in operation.
- the separator (12) will be high enough to establish a natural barrier so that cold air does not move to the other side to and create frosting. This situation is likely to happen provided that the fresh food compartment (18) temperature is low, the fresh food fan (9) is in off position and one of the sub-evaporators (10 and 11) is still in operation. Because of the separator (12), cold air will be trapped in its volume so that frosting problems in neighbouring evaporator will be eliminated.
- the refrigeration appliance further comprises a drain tray (13) for collecting the defrost water during the defrosting and two separate drain holes (15 and 16) for each sub-evaporators (10 and 11) for allowing easy drainage of water without having affecting the other.
- the freezer evaporator (6) and the fresh food evaporator (20) are arranged in parallel. Therefore, the refrigerant either goes through the fresh food evaporator (20) or the freezer evaporator (6).
- the refrigeration appliance further comprises a capillary tube (4c) for decreasing the pressure and the temperature of the refrigerant that is supplied to the freezer evaporator (6) and a check valve (19) for avoiding the back flow of the refrigerant to the freezer evaporator (6).
- the refrigerant after the filter-dryer (3) is directed either to the fresh food evaporator (20) or to the freezer evaporator (6).
- the defrosting method of the sub-evaporators (10 and 11) is the same.
- the refrigerant after leaving the sub-evaporators (10 and 11) directly goes to the suction line (14).
- the refrigerant is pressurised by the compressor (1) and fed to the condenser (2).
- the condenser (2) refrigerant exchanges heat with the ambient air and condenses.
- Refrigerant then goes through the filter-dryer (3) and solenoid valve (8) which directs the refrigerant to one of the sub-evaporator (10 or 11) or to the freezer evaporator (6) through the respective capillary (4a, 4b or 4c).
- the capillaries (4a, 4b and 4c) go through the heat exchanger (5).
- the refrigerant after leaving the sub-evaporators (10 and 11) or the freezer evaporator (6) goes to the suction line (14).
- the check valve (19) prevents back flows through the freezer evaporator (6) when one of the sub-evaporators (10 or 11) is in operation and the freezer evaporator (6) is in off position. Refrigerant completes its cycle when it returns to the compressor (1) again.
- refrigerant is directed to one of the sub-evaporators (10 and 11).
- Solenoid valve (8) for a predetermined defrost duration tdef1, directs the refrigerant only to the first sub-evaporator (10).
- frost accumulates only on the first sub evaporator surface (10) in which refrigerant is fed through.
- tdef1 if the fresh food fan (9) is operating, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air helps defrosting of the second sub evaporator (11) which is in rest position i.e. refrigerant is not fed through.
- the refrigeration appliance of the current invention eliminates the use of electrical heaters for the defrosting of fresh food evaporators, thus, decreases the energy consumption while providing a satisfactory cooling.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
Description
- The present invention relates to a refrigeration appliance having multiple refrigeration compartments and a method for defrosting such a refrigeration appliance.
- A typical refrigeration appliance has two separate compartments which are kept at different temperatures, at least a compressor for supplying refrigerant, and one or more evaporators over which the warm air from the compartments is circulated by means of fan. Fan draws the warmer air from the compartments and circulates it over the evaporator surfaces, and deliver colder air to the compartments. Circulation of warm air over the evaporators results in accumulation of frost on the evaporator, and decreases the efficiency of the refrigerator. Therefore, frost is melted periodically during a defrost cycle.
- During the defrost cycle, the compressor stops and a heat source is activated. Commonly used heat source is a resistant heater. Use of resistant heaters increases energy consumption. Furthermore, efficiency of defrosting with resistant heaters are generally very low, around 30%, that means most of the energy is consumed for heating the cabinet instead of melting the frost.
- In US Patent No. 5,406,805, two separate evaporators are utilized for each of the compartments. Defrosting of fresh food evaporator is achieved by circulating the fresh food compartment air through evaporator by means of a fan when the compressor is off. The warm air defrosting process is only effective when the compressor is off. Since the compressor is off during the defrosting period, temperature in the fresh food compartment and especially in the freezer compartment may rise above the allowed limits due to the longer defrost duration when it is compared to defrosting with resistant heaters. Therefore, in order to ensure an effective defrost, a resistant heater is also used which decreases the benefits of air defrosting and increases cost as well.
- The object of this invention is to provide a method for efficiently defrosting a refrigeration appliance and a refrigeration appliance using thereof.
- An embodiment of the defrosting method and the refrigerator using thereof, which is realised in order to attain the said object of the invention is illustrated in the attached drawings, wherein;
- Figure 1, is a schematic view of the cooling circuit for a system in which evaporators are arranged in series;
- Figure 2, is a schematic view of the cooling circuit for a system in which evaporators are arranged in parallel;
- The components shown in the drawings have been enumerated individually, as follows;
- 1- Compressor
- 2- Condenser
- 3- Filter-dryer
- 4a- capillary tube for first sub evaporator
- 4b- capillary tube for second sub evaporator
- 4c- capillary tube for freezer evaporator)
- 5- Suction line heat exchanger
- 6- Freezer Evaporator
- 7- Freezer Fan
- 8- Solenoid valve
- 9- Fresh food fan
- 10- First sub-evaporator
- 11- Second sub-evaporator
- 12- Separator
- 13- Drain tray
- 14- Suction line
- 15- Drain hole for first sub evaporator
- 16- Drain hole for second sub evaporator
- 17- Freezer compartment
- 18- Fresh food compartment
- 19- Check valve
- 20- Fresh food evaporator
- A typical refrigeration appliance, cooled with the circulation of a refrigerant having multiple refrigeration compartments, specifically a fresh food compartment (18) and a freezer compartment (17), comprises a compressor (1) for pressurizing the refrigerant vapour to increase the pressure and temperature of the refrigerant, a condenser (2) for condensing the refrigerant, a filter-dryer (3) for capturing the moisture and impurities of the refrigerant, a capillary tube (4) for decreasing the pressure and thus the temperature of the refrigerant, a suction line heat exchanger (5), a fresh food evaporator (20) for cooling the fresh food compartment (18) and a fresh food fan (9) for circulating air over the fresh food evaporator (20), a freezer evaporator (6) for cooling the freezer compartment (17) and a freezer fan (7) for circulating air over the freezer evaporator (6) and a suction line (14) for turning the refrigerant back to the compressor (1).
- The fresh food evaporator (20) and the freezer evaporator (6) can be arranged either in series or in parallel. In series arrangement, the refrigerant first circulates through one of the evaporators then through the other , whereas in parallel arrangement, the refrigerant goes through the evaporators independently. In order to cool the compartments (17 and 18), the compressor (1) is turned on and off. If the temperature in the freezer cabinet (17) is high, the compressor (1) and the freezer fan (7) are turned on. While the compressor (1) is on, if the fresh food cabinet (18) temperature is high, the fresh food fan (9) is activated.
- In the preferred embodiment of the present invention, the freezer evaporator (6) and the fresh food evaporator (20) are arranged in series. Therefore, the refrigerant preferably first goes through the fresh food evaporator (20) and then the freezer evaporator (6).
- In the refrigeration appliance of the present invention, the fresh food evaporator (20) is composed of more than one sub-evaporator that are arranged in parallel. Preferably, there are two sub-evaporators namely a first sub-evaporator (10) and a second sub-evaporator (11). Sub-evaporators (10 and 11) are arranged in parallel and both of the sub-evaporators (10 and 11) are used sequentially for cooling the fresh-food compartment.
- The refrigeration appliance further comprises a separator (12) for isolating the first sub-evaporator (10) and the second sub-evaporator (11) from each other, a solenoid valve (8), preferably a bi-stable valve, for directing the refrigerant to one of the sub-evaporators (10 and 11) and two capillary tubes (4a and 4b) for decreasing the pressure and thus the temperature of the refrigerant that is supplied to the first and second sub evaporators (10 and 11) respectively.
- During a cooling cycle, the refrigerant is pressurised by the compressor (1) and fed into the condenser (2). Through the condenser (2), refrigerant exchanges heat with the ambient air and condenses. Refrigerant then goes through the filter-dryer (3) and the solenoid valve (8) which directs the refrigerant to the preferred sub-evaporator (10 or 11) through the respective capillary (4a or 4b). The capillaries (4a and 4b) for creating heat exchange between the capillary tube (4) and the suction line (14), goes through the heat exchanger (5). Concurrently the fresh food compartment fan (9), draws warm air from the fresh food compartment (18). Warm air passes over the fresh food sub evaporators (10 and 11), cools down and then returns to the fresh food compartment (18).
- After the fresh food evaporator (20), refrigerant goes through the freezer evaporator (6) where freezer cabinet is cooled by means of cold air circulated by freezer fan (7). Then refrigerant goes to the heat exchanger (5) and suction line (14). Refrigerant completes its cycle when it returns to the compressor (1) again.
- During the cooling cycle, refrigerant is directed to one of the sub-evaporators (10 and 11). Solenoid valve (8), for a predetermined defrost duration tdef1, directs the refrigerant only to the first sub-evaporator (10). During the circulation of air over the sub-evaporators (10 and 11) frost accumulates only on the first sub evaporator surface (10) in which refrigerant is fed through. During the predetermined defrost duration tdef1 if the fresh food fan (9) is operating, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air helps defrosting of the second sub evaporator (11) which is in rest position i.e. refrigerant is not fed through. In the meantime, warm air is cooled by the first sub-evaporator (10). After the duration tdef1, the same steps are repeated for defrosting the first sub-evaporator (10). This time, the solenoid valve (8), for the duration tdef2" directs the refrigerant only to the second sub-evaporator (11). During the circulation of air over the fresh food evaporators (10 and 11) frost accumulates only on the second sub evaporator surface (11) in which refrigerant is fed through. During the predetermined tdef2 defrost duration if the fresh food fan (9) is active, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air travels over the first sub-evaporator (10) and helps frost melting. In the mean time, warm air is cooled by the second sub-evaporator (11).
- Since no additional resistant heaters or other means are used for defrosting, the predetermined defrost duration is experimentally optimized for allowing the complete defrost of the sub-evaporators (10 or 11). This enables continuous cooling of the fresh food compartment (18) and defrosting of the fresh food evaporator (20) concurrently.
- The sub-evaporators (10 and 11) are isolated with the separator (12) which is preferably made of styrofoam and covered with an aluminium folio which keeps moisture away from the styrofoam material and avoiding hygiene problems. The separator (12) does not interfere the airflow, but prevents the air shortcuts between evaporators. Air is always circulated over both of the sub-evaporators (10 and 11) regardless of which one is in operation. The separator (12) will be high enough to establish a natural barrier so that cold air does not move to the other side to and create frosting. This situation is likely to happen provided that the fresh food compartment (18) temperature is low, the fresh food fan (9) is in off position and one of the sub-evaporators (10 and 11) is still in operation. Because of the separator (12), cold air will be trapped in its volume so that frosting problems in neighbouring evaporator will be eliminated.
- The refrigeration appliance further comprises a drain tray (13) for collecting the defrost water during the defrosting and two separate drain holes (15 and 16) for each sub-evaporators (10 and 11) for allowing easy drainage of water without having affecting the other.
- In another embodiment of the present invention, the freezer evaporator (6) and the fresh food evaporator (20) are arranged in parallel. Therefore, the refrigerant either goes through the fresh food evaporator (20) or the freezer evaporator (6). In parallel arrangement, the refrigeration appliance further comprises a capillary tube (4c) for decreasing the pressure and the temperature of the refrigerant that is supplied to the freezer evaporator (6) and a check valve (19) for avoiding the back flow of the refrigerant to the freezer evaporator (6).
- In this alternative embodiment, the refrigerant after the filter-dryer (3) is directed either to the fresh food evaporator (20) or to the freezer evaporator (6). The defrosting method of the sub-evaporators (10 and 11) is the same. The refrigerant after leaving the sub-evaporators (10 and 11) directly goes to the suction line (14).
- During a cooling cycle, the refrigerant is pressurised by the compressor (1) and fed to the condenser (2). Through the condenser (2), refrigerant exchanges heat with the ambient air and condenses. Refrigerant then goes through the filter-dryer (3) and solenoid valve (8) which directs the refrigerant to one of the sub-evaporator (10 or 11) or to the freezer evaporator (6) through the respective capillary (4a, 4b or 4c). The capillaries (4a, 4b and 4c) go through the heat exchanger (5). Concurrently the fresh food compartment fan (9) draws warm air from the fresh food compartment (18). Warm air passes over the fresh food sub evaporators (10 and 11), and cools down, then returns to the fresh food compartment (18). During the circulation of air over the fresh food evaporators (10 or 11), frost accumulates on the evaporator surfaces and that decreases the efficiency of the refrigeration appliance.
- The refrigerant after leaving the sub-evaporators (10 and 11) or the freezer evaporator (6) goes to the suction line (14). The check valve (19) prevents back flows through the freezer evaporator (6) when one of the sub-evaporators (10 or 11) is in operation and the freezer evaporator (6) is in off position. Refrigerant completes its cycle when it returns to the compressor (1) again.
- During the cooling cycle, refrigerant is directed to one of the sub-evaporators (10 and 11). Solenoid valve (8), for a predetermined defrost duration tdef1, directs the refrigerant only to the first sub-evaporator (10). During the circulation of air over the sub-evaporators (10 and 11) frost accumulates only on the first sub evaporator surface (10) in which refrigerant is fed through. During the predetermined defrost duration tdef1 if the fresh food fan (9) is operating, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air helps defrosting of the second sub evaporator (11) which is in rest position i.e. refrigerant is not fed through. In the mean time, warm air is cooled by the first sub-evaporator (10). After the duration tdef1, the same steps are repeated for defrosting the first sub-evaporator (10). This time, the solenoid valve (8), for the duration tdef2" directs the refrigerant only to the second sub-evaporator (11). During the circulation of air over the fresh food evaporators (10 and 11) frost accumulates only on the second sub evaporator surface (11) in which refrigerant is fed through. During the predetermined tdef2 defrost duration if the fresh food fan (9) is operating, warm air is circulated over both of the sub-evaporators (10 and 11). Warm air travels over the first sub-evaporator (10) and helps frost melting. In the mean time, warm air is cooled by the second sub-evaporator (11).
- The refrigeration appliance of the current invention eliminates the use of electrical heaters for the defrosting of fresh food evaporators, thus, decreases the energy consumption while providing a satisfactory cooling.
Claims (4)
- A method for defrosting a refrigeration appliance including a fresh food compartment (18) and a freezer compartment (17) which are kept at different temperatures, a fresh food evaporator (20) which is composed of two separate evaporators namely a first sub-evaporator (10) and a second sub-evaporator (11) that are arranged in parallel, and a freezer evaporator (6) for cooling the fresh food (18) and the freezer compartment (17) respectively, a solenoid valve (8) and a fresh food fan (9) the method comprising the steps of: providing via solenoid valve (8) only the first sub-evaporator (10) with the refrigerant for a predetermined defrost du ration (tdef1) operating the fresh food fan (9) at least partially during the defrost duration (tdef1) so that warm air helps defrosting of the second sub evaporator (11) which is in rest position, stopping the flow of refrigerant to the first sub-evaporator (10) via solenoid valve (8), directing the refrigerant to the second sub-evaporator (11) only for a predetermined defrost duration (tdef2) and operating the fresh food fan (9) at least partially during the defrost duration (tdef2) so that warm air helps defrosting of the first sub evaporator (10) which is in rest position whereby continuous cooling of the fresh food compartment (18) and defrosting of the fresh food evaporator (20) are achieved concurrently.
- A refrigeration appliance including a fresh food compartment (18) and a freezer compartment (17) which are kept at different temperatures, a fresh food evaporator (20) and a freezer evaporator (6) for cooling the fresh food compartment (18) and the freezer compartment (17) respectively, a fresh food fan (9) for circulating air over the fresh food evaporator (20), characterized in that, the fresh food evaporator (20) is composed of a first sub-evaporator (10) and a second sub-evaporator (11) which are connected in parallel and the refrigeration appliance further comprises a solenoid valve (8) for directing the refrigerant to one of the fresh food sub-evaporators (10, 11) during which the fresh food fan (9) operates at least partially so that the continuous cooling of the fresh food compartment (18) and defrosting of the fresh food evaporator (20) are achieved concurrently.
- A refrigeration appliance according to claim 1, characterized in that, the sub-evaporators (10 and 11) are isolated with a separator (12) which is preferably made of styrofoam and covered with an aluminium folio which keeps moisture away from the styrofoam material and avoiding hygiene problems and which is high enough to establish a natural barrier so as to prevent cold air moving to the other side and create frosting.
- A refrigeration appliance according to claims 1 to 3, characterized by a drain tray (13) for collecting the defrost water during the defrosting and two separate drain holes (15 and 16) for each sub-evaporators (10 and 11) to permit the water flow easily without affecting the other one.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/TR2000/000058 WO2002037038A1 (en) | 2000-11-03 | 2000-11-03 | A defrosting method and a refrigeration appliance using thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1334321A1 EP1334321A1 (en) | 2003-08-13 |
EP1334321B1 true EP1334321B1 (en) | 2006-06-14 |
Family
ID=21619308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00978196A Expired - Lifetime EP1334321B1 (en) | 2000-11-03 | 2000-11-03 | A defrosting method and a refrigeration appliance using thereof |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1334321B1 (en) |
AT (1) | ATE330191T1 (en) |
AU (1) | AU2001215680A1 (en) |
DE (1) | DE60028837T2 (en) |
ES (1) | ES2266001T3 (en) |
TR (1) | TR200301052T1 (en) |
WO (1) | WO2002037038A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1586837A1 (en) * | 2004-04-16 | 2005-10-19 | Electrolux Home Products Corporation N.V. | Refrigerator apparatus with freezer compartment and simplified defrosting device |
DE102004035123B4 (en) * | 2004-07-20 | 2009-07-23 | Wurm Gmbh & Co. Kg | cooling system |
KR100597748B1 (en) * | 2004-08-27 | 2006-07-07 | 삼성전자주식회사 | Cooling system |
CN102331136A (en) * | 2011-10-13 | 2012-01-25 | 海尔集团公司 | Direct cooling refrigerator |
CN102564005A (en) * | 2011-10-13 | 2012-07-11 | 海尔集团公司 | Direct cooling type refrigerator |
CN102767929B (en) * | 2012-06-05 | 2017-04-05 | 海尔集团公司 | A kind of refrigerator and control method |
CN102706021A (en) * | 2012-06-18 | 2012-10-03 | 合肥华凌股份有限公司 | Refrigeration device, refrigeration system and defrosting control method for refrigeration device |
GB2566671B (en) * | 2017-07-17 | 2021-07-28 | Andrew Simon | Heat pump apparatus |
CN111936801B (en) | 2018-04-13 | 2022-08-09 | 开利公司 | Method for defrosting a refrigeration system having a plurality of heat absorption heat exchangers |
CN111879029B (en) * | 2020-07-28 | 2021-05-14 | 西安交通大学 | Heat pump system of micro-channel heat exchanger and optimized restarting heating control method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6029576A (en) * | 1983-07-25 | 1985-02-14 | 株式会社東芝 | Refrigerator |
US5187945A (en) * | 1991-05-13 | 1993-02-23 | Reefco Manufacturing Corporation | Refrigerated container |
US5406805A (en) | 1993-11-12 | 1995-04-18 | University Of Maryland | Tandem refrigeration system |
GB9500160D0 (en) * | 1995-01-05 | 1995-03-01 | British United Shoe Machinery | Chillers |
-
2000
- 2000-11-03 WO PCT/TR2000/000058 patent/WO2002037038A1/en active IP Right Grant
- 2000-11-03 AU AU2001215680A patent/AU2001215680A1/en not_active Abandoned
- 2000-11-03 EP EP00978196A patent/EP1334321B1/en not_active Expired - Lifetime
- 2000-11-03 ES ES00978196T patent/ES2266001T3/en not_active Expired - Lifetime
- 2000-11-03 AT AT00978196T patent/ATE330191T1/en not_active IP Right Cessation
- 2000-11-03 TR TR2003/01052T patent/TR200301052T1/en unknown
- 2000-11-03 DE DE60028837T patent/DE60028837T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60028837D1 (en) | 2006-07-27 |
ATE330191T1 (en) | 2006-07-15 |
WO2002037038A1 (en) | 2002-05-10 |
TR200301052T1 (en) | 2007-01-22 |
EP1334321A1 (en) | 2003-08-13 |
ES2266001T3 (en) | 2007-03-01 |
AU2001215680A1 (en) | 2002-05-15 |
DE60028837T2 (en) | 2007-01-18 |
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