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
• • 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
  • F25B2500/00—Problems to be solved
  • F25B2500/31—Low ambient temperatures
• • 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
  • F25B2600/0251—Compressor control by controlling speed with on-off operation
• • 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
• • 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
  • F25D2400/34—Temperature balancing 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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2600/00—Control issues
  • F25D2600/02—Timing
• • 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
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/10—Sensors measuring the temperature of the evaporator
• • 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
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/12—Sensors measuring the inside temperature

Definitions

• the present invention relates to a cooling device comprising a fresh food compartment and a freezer compartment.
• Domestic type cooling devices generally consist of two separate compartments, fresh food and freezer, that are kept at different temperatures.
• the fresh food compartment is utilized preferably for storing fresh food and the freezer compartment for storing frozen food.
• the cooling device having two compartments kept at different temperatures is provided to cool by means of a different refrigerant circuit for each compartment. Such cooling devices have high cost.
• the cooling devices with two compartments operating at different temperatures can also be provided to cool by means of a single refrigerant circuit and a temperature sensor disposed in the fresh food compartment.
• the major problem in the refrigerators wherein the refrigeration is performed by taking the temperature of the fresh food compartment as reference is encountered when the external ambient temperature is lower than the determined value. In this case, the heat gain in the fresh food compartment of the refrigerator is very low and the runtime ratio of the compressor decreases thus lowering the refrigerating efficiency of the freezer compartment.
• the temperature of the freezer compartment exceeds the desired temperature value and causes the storage life of the frozen foods to decrease or the foods to be spoiled.
• a heating element is placed in the fresh food compartment of the refrigerator to solve the problem.
• the temperature of the fresh food compartment is increased by activating the heating element and thus the compressor is provided to operate.
• the external ambient temperature is low and the compressor does not operate for a long time, temperature variations are observed in both compartments. Furthermore, the temperature of the freezer compartment cannot be prevented from exceeding the determined value.
• Italian Patent No. IT1027733 the heater is provided to be deactivated by means of a manual control at high temperatures. This technique is not sensitive enough since it is dependent on the user.
• a timer is added to the system in order to decrease the energy consumption.
• the ambient temperature is detected by means of a sensor disposed in the fresh food compartment. If the stopping time of the compressor is lower than a determined delay time, the heater is not activated, thus unnecessary energy consumption is prevented. In cases wherein the external ambient temperature is low, the stopping time of the compressor is higher than the determined delay time and the heater is activated.
• the aim of the present invention is the realization of a cooling device wherein efficient cooling is performed independently of the ambient temperature.
• the control unit operates the fan that provides air circulation in the fresh food compartment. Since operation of the fan increases the temperature of the refrigerant circulating in the refrigeration circuit, the control unit operates the compressor when this temperature is detected by the temperature sensor to reach the temperature for starting of the compressor. Thus, the compressor is prevented from being stopped for a long time period at low ambient temperature and the foods in the freezer compartment from being spoiled.
• the fan when the fan is operated due to the compressor being stopped for a long time, the fan is operated until the temperature detected by the temperature sensor reaches at least the temperature whereat the compressor is started.
• the fan when the fan is operated due to the compressor being stopped for a long time period, the fan is operated until the temperature detected by the temperature sensor reaches the temperature whereat the compressor is stopped.
• a fan is disposed inside the fresh food compartment that provides air circulation therein.
• the fan when the heater is operated due to the compressor being stopped for a long time, the fan is also operated.
• heat transfer is accelerated and the freezing risk of the foods in the fresh food compartment resulting from the compressor being stopped for a long time is eliminated.
• the temperature sensor detects the temperature of the fresh food compartment or the temperature of the fresh food compartment evaporator in order to control starting and stopping of the compressor.
• the need for heating the fresh food compartment in order to provide starting of the compressor in cold environments is provided by the present heater used for preventing frosting of the freezer compartment evaporator and thus the use of additional heating element to this end is eliminated.
• Figure 1 – is the schematic view of a cooling device.
• the cooling device (1) of the present invention comprises:
• T Scut-in Cut-in temperature predetermined by the producer that provides the starting of the compressor (4) by the control unit (9) when detected by the temperature sensor (7).
• T Scut-out Cut-out temperature predetermined by the producer that provides the stopping of the compressor (4) by the control unit (9) when detected by the temperature sensor (7).
• t compOFFlim Limit time predetermined by the producer during which the compressor (4) can remain stopped.
• T fanON Cut-in temperature predetermined by the producer which provides the activation of the fan (8) by the control unit (9) when detected by the temperature sensor (7).
• T fanOFF Cut-out temperature predetermined by the producer which provides the deactivation of the fan (8) by the control unit (9) when detected by the temperature sensor (7).
• the control unit (9) compares the temperature (T S ) detected by the temperature sensor (7) with the cut-out temperature (T Scut-out ) of the compressor (4) predetermined by the producer while the compressor (4) operates.
• the control unit (9) stops the compressor (4) and thus the refrigeration operation is paused. While the compressor (4) is stopped, the control unit (9) this time compares the temperature (T S ) detected by the temperature sensor (7) with the cut-in temperature (T Scut-in ) of the compressor (4) predetermined by the producer.
• the control unit (9) starts the fan (8) even if the temperature (T S ) detected by the temperature sensor (7) does not reach the cut-in temperature (T fanON ) predetermined by the producer for starting of the fan (8) by the control unit (9) when detected by the temperature sensor (7). Consequently, the temperature (T S ) detected by the temperature sensor (7) reaches the cut-in temperature (T Scut-in ) of the compressor (4) predetermined by the producer and accordingly the compressor (4) is provided to be started by the control unit (9).
• the compressor (4) is prevented from being stopped for a long time period and therefore the temperature of the freezer compartment (3) from exceeding the required temperature.
• the control unit (9) starts the fan (8) even if the temperature (T S ) detected by the temperature sensor (7) does not reach the cut-in temperature (T fanON ) predetermined by the producer for starting of the fan (8) by the control unit (9) upon detection by the temperature sensor (7) since the time (t compOFF ) the compressor (4) remains stopped reaches a limit duration (t compOFFlim ) predetermined by the producer, the fan (8) is operated until the temperature (T S ) detected by the temperature sensor (7) reaches at least the cut-in temperature (T Scut-in ) of the compressor (4).
• the control unit (9) when the control unit (9) activates the fan (8) even if the temperature (T S ) detected by the temperature sensor (7) does not reach the cut-in temperature (T fanON ) predetermined by the producer for activation of the fan (8) by the control unit (9) upon detection by the temperature sensor (7) since the time (t compOFF ) the compressor (4) remains stopped reaches a limit duration (t compOFFlim ) predetermined by the producer, the fan (8) is operated until the temperature (T S ) detected by the temperature sensor (7) reaches the cut-off temperature (T fanOFF ) predetermined by the producer for deactivation of the fan (8) by the control unit (9) upon detection by the temperature sensor (7).
• the temperature sensor (7) detects the temperature of the fresh food compartment (2).
• the control unit (9) controls the refrigeration process by taking the temperature of the fresh food compartment (2) as reference.
• the temperature sensor (7) detects the temperature of the fresh food compartment evaporator (5).
• the control unit (9) controls the refrigeration process by taking the temperature of the fresh food compartment evaporator (5) as reference.
• the compressor (4) being stopped for a long time period and thus the thawing risk of the foods in the freezer compartment (3) is prevented by providing the control of the components present in the cooling device (1) suitably without requiring the use of an additional heating device.

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• 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)

Applications Claiming Priority (2)

Publications (1)

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• 2011
  • 2011-06-07 WO PCT/EP2011/059358 patent/WO2011154388A2/en active Application Filing
  • 2011-06-07 EP EP11723960.8A patent/EP2580547A2/de active Pending

Non-Patent Citations (2)

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