EP2520881A1 - Système de réfrigération et procédé pour réfrigérer deux compartiments avec des évaporateurs en série - Google Patents
Système de réfrigération et procédé pour réfrigérer deux compartiments avec des évaporateurs en série Download PDFInfo
- Publication number
- EP2520881A1 EP2520881A1 EP11165082A EP11165082A EP2520881A1 EP 2520881 A1 EP2520881 A1 EP 2520881A1 EP 11165082 A EP11165082 A EP 11165082A EP 11165082 A EP11165082 A EP 11165082A EP 2520881 A1 EP2520881 A1 EP 2520881A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compartment
- evaporator
- fan
- compartments
- compressor
- 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.)
- Ceased
Links
Images
Classifications
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
-
- 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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
Definitions
- the present invention relates to a refrigeration system for cooling at least two compartments comprising a compressor, a first compartment including a first evaporator and a fan associated therewith, a second compartment including a second evaporator, wherein said first and second evaporators are arranged in series and said first compartment is to be maintained at a temperature lower than said second compartment.
- variable capacity compressors VCC which allow energy saving during the standard working mode of a refrigerator appliance. This is mainly due to the capability of increasing the cooling capacity only when required (door opening, start-up, temperature recovery after automatic de-frost), maintaining a low power absorption when higher values are not required.
- Such variable capacity compressors may have an electric motor whose rotational speed can be adjusted, or may be of the kind in which the stroke of the compressor piston can be adjusted as well.
- variable capacity compressor For the time being these variable capacity compressor have never been used in a mono-circuit combi refrigerator (two evaporators in series, one dedicated to freezer and one to refrigerator). The reason lies in the difficult to reach a proper balance of the dimension of the two evaporators, designed with respect to a particular value of overall cooling capacity. Increasing (or decreasing) the cooling capacity provided by the compressor could drive to an improper distribution of the cooling capacity between freezer and fresh food compartment evaporators. As a result, it becomes impossible to maintain the set temperature levels selected by the user in the two cavities.
- the refrigeration system deals with a mono-circuit refrigerator appliance provided with a No-Frost freezer evaporator. This means that a forced airflow is blown across the freezer evaporator thanks to a dedicated fan.
- VCC compressor turns on, it starts cooling both freezer and refrigerator evaporators with a certain cooling capacity. Once a door is opened, or another event which requires an increase in cooling capacity, comprising a low temperature setting selected by the user occurs in refrigerator compartment, a higher cooling capacity is required only in this compartment, while freezer compartment still keeps requiring the same level of cooling capacity already provided by the compressor. Control logic, according to refrigerator requirement, increases the cooling capacity provided by VCC. This generates an undesired over-cooling of the freezer compartment.
- freezer fan is controlled in such a way that when no increase in cooling capacity is required in the freezer compartment (but it is required in fresh food compartment), it is turned off for limited periods, not removing heat from freezer evaporator. This allows taking advantage of the benefits of VCC, avoiding causing improper balance of the dimensions of two evaporators.
- the cooling capacity delivered to the freezer compartment is controlled by changing the rotational speed of the fan, instead of controlling the fan with an ON-OFF duty cycle.
- FIG 2 it is shown a condition in which the refrigeration circuit id optimized for a certain fixed cooling capacity provided by the compressor when the ambient temperature is 25°C.
- temperature in both compartments (solid lines C and E) are cycling close to set-point values (dotted lines A and B).
- This "balance" situation is maintained up to a perturbation of the system, as shown for instance in figure 3 where the ambient temperature is increased up to 32°C (this disturbance is taken only as an example, since every kind of disturbance leads to an "unbalanced" situation).
- an increased cooling capacity is required and, as it clear by considering line E of figure 3 , the circuit is no longer balanced and the freezer evaporator 20 is cooled down too much.
- the fresh food compartment evaporator 22 is schematically shown as a plate located in the cavity, it can be as well of the type in contact with the outside surface of the cavity liner. Also the freezer evaporator 20 can be of any kind used for no-frost evaporator.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11165082A EP2520881A1 (fr) | 2011-05-06 | 2011-05-06 | Système de réfrigération et procédé pour réfrigérer deux compartiments avec des évaporateurs en série |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11165082A EP2520881A1 (fr) | 2011-05-06 | 2011-05-06 | Système de réfrigération et procédé pour réfrigérer deux compartiments avec des évaporateurs en série |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2520881A1 true EP2520881A1 (fr) | 2012-11-07 |
Family
ID=44340251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11165082A Ceased EP2520881A1 (fr) | 2011-05-06 | 2011-05-06 | Système de réfrigération et procédé pour réfrigérer deux compartiments avec des évaporateurs en série |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2520881A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019112093A1 (de) * | 2018-07-12 | 2020-01-16 | Liebherr-Hausgeräte Ochsenhausen GmbH | Kühl- und/oder Gefriergerät |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998003825A1 (fr) * | 1996-07-19 | 1998-01-29 | Sunpower, Inc. | Circuit de refrigeration comportant des evaporateurs en serie et un compresseur modulable |
EP0990862A1 (fr) * | 1998-10-02 | 2000-04-05 | Kabushiki Kaisha Toshiba | Réfrigérateur-Congélateur avec deux évaporateurs respectivement pour chambres de réfrigération et de congélation |
US6286326B1 (en) * | 1998-05-27 | 2001-09-11 | Worksmart Energy Enterprises, Inc. | Control system for a refrigerator with two evaporating temperatures |
US6327867B1 (en) * | 1998-02-20 | 2001-12-11 | Matsushita Refrigeration Company | Refrigerator having a cooler mounted in each of a refrigerator compartment and a freezer compartment |
US20030131618A1 (en) * | 2002-01-15 | 2003-07-17 | Takashi Doi | Two-evaporator refrigerator having a controlled variable throttler |
-
2011
- 2011-05-06 EP EP11165082A patent/EP2520881A1/fr not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998003825A1 (fr) * | 1996-07-19 | 1998-01-29 | Sunpower, Inc. | Circuit de refrigeration comportant des evaporateurs en serie et un compresseur modulable |
US6327867B1 (en) * | 1998-02-20 | 2001-12-11 | Matsushita Refrigeration Company | Refrigerator having a cooler mounted in each of a refrigerator compartment and a freezer compartment |
US6286326B1 (en) * | 1998-05-27 | 2001-09-11 | Worksmart Energy Enterprises, Inc. | Control system for a refrigerator with two evaporating temperatures |
EP0990862A1 (fr) * | 1998-10-02 | 2000-04-05 | Kabushiki Kaisha Toshiba | Réfrigérateur-Congélateur avec deux évaporateurs respectivement pour chambres de réfrigération et de congélation |
US20030131618A1 (en) * | 2002-01-15 | 2003-07-17 | Takashi Doi | Two-evaporator refrigerator having a controlled variable throttler |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019112093A1 (de) * | 2018-07-12 | 2020-01-16 | Liebherr-Hausgeräte Ochsenhausen GmbH | Kühl- und/oder Gefriergerät |
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