Abstract:
An operation control method of a refrigerator including a main body defining a freezing compartment and a refrigerating compartment, an evaporator cooling the freezing compartment and the refrigerating compartment, a heater defrosting the evaporator, and a plurality of blowing fans respectively corresponding to the freezing compartment and the refrigerating compartment. The method includes setting a heater operation temperature less than a control temperature of the refrigerating compartment; measuring a temperature of air surrounding the refrigerator; measuring an inside temperature of the refrigerating compartment; and operating the heater and the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is less than a set reference surrounding air temperature and the measured inside temperature is less than the heater operation temperature.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application claims benefit of Korean Patent Application No. 10-2005-0073742, filed on Aug. 11, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.  
       BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     The present invention relates to an operation control method of a refrigerator, and more particularly, to an operation control method of a refrigerator, which is capable of preventing unnecessary cooling and heating operations from being performed in a refrigerating compartment when the surrounding air has a low temperature.  
         [0004]     2. Description of the Related Art  
         [0005]     A refrigerator is an apparatus for keeping various foods fresh for a long period of time by using cooling air produced in a cooling loop. The refrigerator usually includes a freezing compartment for storing frozen foods below freezing temperature, a refrigerating compartment for storing refrigerated foods over the freezing temperature, and the cooling loop for cooling the freezing compartment and the refrigerating compartment.  
         [0006]      FIG. 1  illustrates a schematic layout of a cooling loop  10  of a so-called independent cooling method, as an example of the cooling loop  10 , in which evaporators  41 ,  51  and blowing fans  43 ,  53  are independently provided in a refrigerating compartment  40  and a freezing compartment  50 . Referring to the drawing, the cooling loop  10  is provided with a compressor  11  compressing a refrigerant of a high temperature and a low pressure into one of a high temperature and a high pressure, a condenser  12  condensing a compressed refrigerant, a capillary tube  13  adiabatically expanding the condensed refrigerant of a low temperature and a high pressure, and the evaporators  41 ,  51  provided in the refrigerating compartment  40  and the freezing compartment  50 , respectively to evaporate the expanded refrigerant and thus produce the cooling air. The cooling loop  10  can be further provided with the blowing fans  43 ,  53  supplying the cooling air produced by the evaporators  41 ,  51  to the refrigerating compartment  40  and the freezing compartment  50 , and a refrigerating compartment heater  45  and a freezing compartment heater  55  to heat and defrost the evaporators  41 ,  51 .  
         [0007]     Operation of the cooling loop  10  with the configuration described above will now be described. First, the freezing compartment  50  and the refrigerating compartment  40  are set to maintain a control temperature range having a predetermined upper limit temperature and a predetermined lower limit temperature. When an inside temperature of the freezing compartment  50  or the refrigerating compartment  40  is out of the control temperature range, the compressor  11  is operated to make the evaporator  51  or  41  produce the cooling air. In general, the compressor  11  is turned on or off according to the inside temperature of the freezing compartment  50 , as the heat load of the compressor is greater than that of the refrigerating compartment  40 .  
         [0008]     In a case where the compressor  11  is operated when a predetermined condition is met (for example, the inside temperature of the freezing compartment  50  is greater than the upper limit temperature), cooling of the refrigerating compartment  40  is usually performed together with cooling of the freezing compartment  50  unless the inside temperature of the refrigerating compartment  40  is less than the lower limit temperature. Therefore, in many cases, when the compressor  11  begins to be operated, the cooling operation of the refrigerating compartment  40  begins. This is intended to reduce a frequency of the separate operation of the compressor  11  for the refrigerating compartment  40  and form a regular operation pattern of the cooling cycle by making it possible to cool the refrigerating compartment  40  and the freezing compartment  50  at the same time by one-time operation of the compressor  11 , thus increasing operation stability of the cooling cycle  10 .  
         [0009]     However, in the conventional operation control method of a refrigerator, there is a drawback. Specifically, when a temperature difference ΔT 1  between a temperature of surrounding air and the inside temperature of the refrigerating compartment  40  is less than a temperature difference ΔT 2  between the inside temperatures of the refrigerating compartment  40  and the freezing compartment  50 , since the temperature of surrounding air around a refrigerator is low, heat of the refrigerating compartment  40  is transferred to the freezing compartment  50 , so that over-cooling of the refrigerating compartment  40  occurs.  
         [0010]     Meanwhile, there are conventional refrigerators that adopt a method of increasing the inside temperature of the refrigerating compartment  40  by using the refrigerating compartment heater  45  and the refrigerating compartment blowing fan  43  when there is a risk of the over-cooling of the refrigerating compartment  40 .  
         [0011]     However, in the conventional refrigerators, a determination whether to operate the refrigerating compartment heater  45  is made based on surface temperature of the evaporator  41 , which is at a very low temperature right after operation of the compressor  11  is stopped. Therefore, the refrigerating compartment heater  45  is operated very frequently, which is a drawback. Also, the inside temperature of the refrigerating compartment  40  is increased undesirably, since the refrigerating compartment heater  45  is operated even when the temperature of surrounding air is so high that it is unnecessary to heat the refrigerating compartment  40  (i.e., ΔT 1 ≧ΔT 2 ), or the inside temperature of the refrigerating compartment  40  is so high that there is no risk of over-cooling of the refrigerating compartment  40 .  
         [0012]     Further, there is another drawback. Since the increased inside temperature of the refrigerating compartment  40  causes the cooling operation to be performed again, and the surface temperature of the evaporator  41 , which drops by the cooling operation, causes the refrigerating compartment heater  45  to be operated, the unnecessary cooling operation and the heating operation are performed repeatedly in the refrigerating compartment  40  for each cooling cycle.  
         [0013]     Accordingly, in the conventional operation control method of a refrigerator, there are various drawbacks. Efficiency is deteriorated, since, for example, more energy is consumed when the surrounding air temperature is in the low temperature state than when in the high temperature state due to the unnecessary cooling and heating operations repeatedly performed when in the low temperature state.  
       SUMMARY OF THE INVENTION  
       [0014]     Accordingly, it is an aspect of the present invention to provide an operation method of a refrigerator, which is capable of reducing energy consumption and thus improving efficiency in operation of the refrigerator by preventing unnecessary cooling and heating operations performed in a refrigerating compartment to prevent over-cooling of the refrigerating compartment when the surrounding air is in a low temperature state.  
         [0015]     Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the invention.  
         [0016]     The foregoing and/or other aspects of the present invention can be achieved by providing an operation control method of a refrigerator including a main body defining a freezing compartment and a refrigerating compartment, an evaporator cooling the freezing compartment and the refrigerating compartment, a heater defrosting the evaporator, and a plurality of blowing fans respectively corresponding to the freezing compartment and the refrigerating compartment, comprising: setting a heater operation temperature less than a control temperature of the refrigerating compartment; measuring a temperature of air surrounding the refrigerator; measuring an inside temperature of the refrigerating compartment; and operating the heater and the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is less than a set reference surrounding air temperature and the measured inside temperature is less than the heater operation temperature.  
         [0017]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises operating the blowing fan corresponding to the refrigerating compartment at the same time that the heater starts to be operated.  
         [0018]     According to an aspect of the present invention, the operation control method further comprises setting a heater stop temperature; and stopping an operation of the heater when the measured inside temperature reaches the heater stop temperature.  
         [0019]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises operating the heater; setting a heater stop temperature; measuring a temperature of the evaporator; stopping the operation of the heater when the measured temperature of the evaporator reaches the set heater stop temperature; and operating the blowing fan corresponding to the refrigerating compartment.  
         [0020]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises operating the heater for a set heater operation time; stopping the operation of the heater after the heater operation time has elapsed; and operating the blowing fan corresponding to the refrigerating compartment.  
         [0021]     According to an aspect of the present invention, the refrigerator further comprises a plurality of the freezing compartments and the refrigerating compartments, and a plurality of the evaporators and the heaters respectively corresponding to the freezing compartments and refrigerating compartments.  
         [0022]     The foregoing and/or other aspects of the present invention can also be achieved by providing an operation control method of a refrigerator including a main body defining a freezing compartment and a refrigerating compartment, an evaporator cooling the freezing compartment and the refrigerating compartment, blowing fans respectively corresponding to the freezing compartment and the refrigerating compartment, and a compressor compressing a refrigerant supplied to the evaporator, comprising: setting a first fan control temperature greater than a control temperature of the refrigerating compartment; measuring a temperature of air surrounding the refrigerator; measuring an inside temperature of the refrigerating compartment; and performing a cooling operation comprising maintaining operation of the compressor and operating the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is less than a set reference surrounding air temperature and the measured inside temperature of the refrigerating compartment is equal to or greater than the first fan control temperature.  
         [0023]     According to an aspect of the present invention, the operation control method further comprises setting a second fan control temperature less than the control temperature the refrigerating compartment; and performing the cooling operation comprising maintaining the operation of the compressor and operating the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is equal to or higher than the reference surrounding air temperature and the measured inside temperature of the refrigerating compartment is equal to or greater than the second fan control temperature.  
         [0024]     According to an aspect of the present invention, the refrigerator further comprises a plurality of the freezing compartments and the refrigerating compartments, and a plurality of the evaporators and the heaters respectively corresponding to the freezing compartments and refrigerating compartments.  
         [0025]     The foregoing and/or other aspects of the present invention can also be achieved by providing an operation control method of a refrigerator including a main body defining a freezing compartment and a refrigerating compartment, an evaporator cooling the freezing compartment and the refrigerating compartment, a heater defrosting the evaporator, a plurality of blowing fans respectively corresponding to the freezing compartment and the refrigerating compartment, and a compressor compressing a refrigerant supplied to the evaporator, comprising: setting a first fan control temperature greater than a control temperature of the refrigerating compartment; setting a heater operation temperature less than the control temperature of the refrigerating compartment; measuring a temperature of air surrounding the refrigerator; measuring an inside temperature of the refrigerating compartment; performing a cooling operation comprising maintaining operation of the compressor and operating the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is less than a set reference surrounding air temperature and the measured inside temperature of the refrigerating compartment is equal to or greater than the first fan control temperature; and heating the refrigerating compartment comprising operating the heater and the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is less than the reference surrounding air temperature and the measured inside temperature is less than the heater operation temperature after the operation of the compressor is stopped.  
         [0026]     According to an aspect of the present invention, the operation control method further comprises setting a second fan control temperature less than the control temperature of the refrigerating compartment; and performing the cooling operation comprising maintaining the operation of the compressor and operating the blowing fan corresponding to the refrigerating compartment when the measured temperature of the surrounding air is equal to or greater than the reference surrounding air temperature and the measured inside temperature of the refrigerating compartment is equal to or greater than the second fan control temperature.  
         [0027]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises operating the blowing fan corresponding to the refrigerating compartment at the same time that the heater starts to be operated.  
         [0028]     According to an aspect of the present invention, the operation control method further comprises setting a heater stop temperature greater than the control temperature of the refrigerating compartment; and stopping the operation of the heater when the measured inside temperature reaches the heater stop temperature.  
         [0029]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises operating the heater; measuring a temperature of the evaporator; stopping the operation of the heater when the measured temperature of the evaporator reaches the set heater stop temperature; and operating the blowing fan corresponding to the refrigerating compartment.  
         [0030]     According to an aspect of the present invention, the operating of the heater and the blowing fan corresponding to the refrigerating compartment comprises: operating the heater for a set heater operation time; stopping the operation of the heater after the heater operation time has elapsed; and operating the blowing fan corresponding to the refrigerating compartment.  
         [0031]     According to an aspect of the present invention, the refrigerator further comprises a plurality of the freezing compartments and refrigerating compartments, and a plurality of the evaporators and the heaters respectively corresponding to the freezing compartments and refrigerating compartments. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0032]     The above and/or other aspects and advantages of the prevent invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which:  
         [0033]      FIG. 1  is a schematic view of a cooling loop in accordance with an embodiment of the present invention;  
         [0034]      FIG. 2  is a block diagram of a refrigerator in accordance with the embodiment of the present invention;  
         [0035]      FIG. 3  is a flowchart of a cooling operation control method in accordance with the refrigerator of  FIG. 2 ; and  
         [0036]     FIGS.  4  to  6  are flowcharts of heating operation control methods of the refrigerator of  FIG. 2 . 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0037]     Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below to explain the present invention by referring to the figures. Before a detailed description of the present invention is provided, it should be noted that although the embodiments are described using a refrigerator of an independent cooling method in which separate evaporators  41 ,  51  and blowing fans  43 ,  53  are provided in a refrigerating compartment  40  and a freezing compartment  50 , application of the present invention is not limited thereto.  
         [0038]      FIG. 2  is a block diagram of a refrigerator in accordance with an embodiment of the present invention. The present refrigerator includes elements similar to elements of the cooling loop  10 , and thus another discussion thereof is omitted.  
         [0039]     The refrigerator further includes an input part  21  for inputting control temperatures of the refrigerating compartment  40  and the freezing compartment  50 , a reference surrounding air temperature T S0 , a first fan control temperature T b1 , a second fan control temperature T b2  and the like, a surrounding air measuring part  23  for measuring a surrounding air temperature T S , a refrigerating compartment inside temperature measuring part  47  for measuring an inside temperature T r  of the refrigerating compartment  40 , and a controller  30 . Additionally, the refrigerator may further include a counting part  27  counting a heater operation time t h  of the heaters  45  and an evaporator surface temperature measuring part  49  for measuring an evaporator surface temperature T E .  
         [0040]     Detailed descriptions of the parts of the refrigerator with the aforementioned configuration will be provided in each operation below when an operation control method is described.  
         [0041]     Referring to  FIG. 3 , after the refrigerator starts to be operated (S 10 ), the reference surrounding air temperature T S0 , the first fan control temperature T b1 , the second fan control temperature T b2 , a heater operation temperature T h1 , a heater stop temperature T h2  and the heater operation time t h  are set through the input part  21  (S 11 ).  
         [0042]     The reference surrounding air temperature T S0  is defined as a reference temperature used to determine whether the surrounding air temperature T S  is in a low temperature state or in a high temperature state. The reference surrounding air temperature T S0  can be varied according to an operation condition of the refrigerator, and can be set at, for example, 18° C.  
         [0043]     The first fan control temperature T b1  is a temperature greater than the control temperature of the refrigerating compartment  40 , and is used to determine whether to operate the refrigerating compartment blowing fan  43  when the surrounding air temperature T S  is less than the reference surrounding air temperature T S0 .  
         [0044]     The second fan control temperature T b2  is a temperature less than the control temperature of the refrigerating compartment  40 , and which is used to determine whether to operate the refrigerating compartment blowing fan  43  when the surrounding air temperature T S  is equal to or greater than the reference surrounding air temperature T S0 .  
         [0045]     Herein, the first fan control temperature T b1  can be set as a control upper limit temperature of the refrigerating compartment  40 , and the second fan control temperature T b2  can be set as a control lower limit temperature of the refrigerating compartment  40 . Alternatively, the first fan control temperature T b1  and the second fan control temperature T b2  can be set different from the control upper limit temperature and the control lower limit temperature, respectively, or can be set different in each of the high temperature state and the low temperature state.  
         [0046]     The heater operation temperature T h1  is set to determine whether to operate the refrigerating compartment heater  45  when the surrounding air temperature T S  is in the low temperature state, while the heater stop temperature T h2  is set to determine whether to stop the operation of the refrigerating compartment heater  45 . Herein, the heater operation temperature T h1  can be equal to or different from the control lower limit temperature, according to operation characteristics of the refrigerator.  
         [0047]     Next, the surrounding air temperature T S  and the inside temperature of the refrigerating compartment  40  (hereinafter, referred to as a refrigerating compartment inside temperature T r ) are measured by the surrounding air measuring part  23  provided outside the refrigerator and the refrigerating compartment inside temperature measuring part  47  provided inside the refrigerating compartment  40  (S 12 ).  
         [0048]     When the compressor  11  is operated under a predetermined condition (for example, when the inside temperature of the freezing compartment  50  is out of the control temperature range) (S 13 ), it is determined whether the surrounding air temperature T S  is in the low temperature state or in the high temperature state by comparing the measured surrounding air temperature T S  with the set reference surrounding air temperature T S0  (S 14 ).  
         [0049]     If it is determined that the surrounding air temperature T S  is in the high temperature state (the surrounding air temperature T S  is equal to or greater than the reference surrounding air temperature T S0 )(S 14 ), the refrigerating compartment inside temperature T r  is compared with the second fan control temperature T b2  (S 18 ). If the refrigerating compartment inside temperature T r  is equal to or greater than the second fan control temperature T b2 , the refrigerating compartment blowing fan  43  is operated to perform the cooling operation (S 19   a ). In contrast, if the measured refrigerating compartment inside temperature T r  is less than the second fan control temperature T b2 , the refrigerating compartment blowing fan  43  is maintained in an inoperative state (S 19   b ).  
         [0050]     Herein, since the refrigerating compartment blowing fan  43  can be in an operative state or the inoperative state while the compressor  11  is operated, the operation S 19   a  can also be described as ‘the refrigerating compartment blowing fan  43  begins operation or is maintained in the operative state’ and the operation S 19   b  can be described as ‘the operation of the refrigerating compartment blowing fan  43  is stopped or the refrigerating compartment blowing fan  43  is maintained in an inoperative state’. Further, it should be noted that, although, in  FIG. 3 , a separate heating operation is not performed when the surrounding air temperature T S  is in the high temperature state, in which over-cooling rarely occurs, the embodiment of the present invention does not exclude the possibility that the separate heating operation is performed to prevent the over-cooling of the refrigerating compartment  40  even when the surrounding air temperature T S  is in the high temperature state.  
         [0051]     Meanwhile, if the surrounding air temperature T S  is determined to be in the low temperature state (S 14 ), the refrigerating compartment inside temperature T r  is compared with the first fan control temperature T b1  (S 16 ). If the refrigerating compartment inside temperature T r  is equal to or greater than the first fan control temperature T b1 , the refrigerating compartment blowing fan  43  is operated (S 17   a ). In contrast, if the refrigerating compartment inside temperature T r  is less than the first fan control temperature T b1 , the refrigerating compartment blowing fan  43  is maintained in the inoperative state (S 17   b ).  
         [0052]     Herein, since the first fan control temperature T b1  is one which is set above the control temperature of the refrigerating compartment  40 , if it is determined whether to operate the refrigerating compartment blowing fan  43  using the first fan control temperature T b1  as a reference when in the low temperature state, frequency of the cooling operation of the refrigerating compartment  40  can be reduced relatively and unnecessary cooling operations can be prevented, thus preventing the over-cooling of the refrigerating compartment  40 .  
         [0053]     FIGS.  4  to  6  are operation control methods of the heater in accordance with various aspects of the present invention. When each aspect is described, duplicate operations will be described only in the first aspect. In the second and the third aspects, operations different from the first aspect will be described in detail.  
         [0000]     First Aspect ( FIG. 4 )  
         [0054]     Referring to the drawing, when the operation of the compressor  11  is stopped under a predetermined condition (for example, the inside temperature of the freezing compartment  50  is within the control temperature range) (S 21 ), the refrigerating compartment inside temperature T r  of the refrigerating compartment  40  is measured through the refrigerating compartment inside temperature measuring part  47  (S 22 ).  
         [0055]     The measured refrigerating compartment inside temperature T r  is compared with the heater operation temperature T h1  (S 23 ). If the refrigerating compartment inside temperature T r  is less than the heater operation temperature T h1 , the refrigerating compartment heater  45  and the refrigerating compartment blowing fan  43  are operated to prevent the over-cooling of the refrigerating compartment  40  (S 24 ). In contrast, if the refrigerating compartment inside temperature T r  is equal to or greater than the heater operation temperature T h1 , the refrigerating compartment heater  45  is maintained in the inoperative state since there is no risk of the over-cooling of the refrigerating compartment  40  (S 28 ).  
         [0056]     The determination whether to operate the refrigerating compartment heater  45  is made based on the refrigerating compartment inside temperature T r  instead of the surface temperature of the evaporators  41 . This prevents unnecessary operation of the refrigerating compartment heater  45  when the refrigerating compartment inside temperature T r  is sufficiently high, while the surface temperature of the evaporators  41  is low.  
         [0057]     Meanwhile, after the refrigerating compartment heater  45  starts to be operated, the refrigerating compartment inside temperature T r  is repeatedly measured to be compared with the heater stop temperature T h2  (S 25 ). If the refrigerating compartment inside temperature T r  becomes equal to or greater than the heater stop temperature T h2 , the operation of the refrigerating compartment heater  45  is stopped (S 26 ). At this time, the operation of the refrigerating compartment blowing fan  43  can be stopped together with the refrigerating compartment heater  45  or its operation can be maintained.  
         [0058]     Next, if the operation of the refrigerator is not stopped (S 27 ), the aforementioned processes are repeated when the compressor  11  is operated in the next cycle (S 13 ).  
         [0000]     Second Aspect ( FIG. 5 )  
         [0059]     An operation control method of the heater in accordance with a second aspect of the present invention is different from that of the first embodiment in that the refrigerating compartment blowing fan  43  starts to be operated after the operation of the refrigerating compartment heater  45  is stopped. That is, if it is determined that the refrigerating compartment inside temperature T r  is less than the heater operation temperature T h1  (S 33 ), only the refrigerating compartment heater  45  starts to be operated first (S 34   a ).  
         [0060]     When the refrigerating compartment heater  45  is operated, the evaporator surface temperature measuring part  49  measures the evaporator surface temperature T E  (S 35 ). Alternatively, instead of the evaporator surface temperature T E  of the evaporator  41 , temperature of another part can be measured as necessary. If the measured evaporator surface temperature T E  is equal to or greater than the heater stop temperature T h2  (S 36 ), the operation of the refrigerating compartment heater  45  is stopped (S 37 ) and the refrigerating compartment blowing fan  43  is operated (S 38 ).  
         [0000]     Third Aspect ( FIG. 6 )  
         [0061]     A condition in which the operation of the refrigerating compartment heater  45  is stopped is different from that of the second aspect.  
         [0062]     That is, the refrigerating compartment heater  45  is operated for the previously set heater operation time t h  and then its operation is stopped (S 45  and S 46 ). Next, the blowing fan  43  starts to be operated. Herein, the counting part  27  measures operation time of the refrigerating compartment heater  45  and transmits a signal indicating the time to the controller  30 .  
         [0063]     As described above, in accordance with the operation control method of a refrigerator of the embodiment of the present invention, when surrounding air is in the low temperature state, the determination whether to operate the heater is made based on the inside temperature of the refrigerating compartment instead of the surface temperature of the evaporator. Therefore, it is possible to operate the heater only when the heating operation is necessary, that is, there is a risk of the over-cooling of the refrigerating compartment, thus preventing the unnecessary cooling operation.  
         [0064]     That is, in the operation control method of a refrigerator in accordance with the embodiment of the present invention, since the cooling operation or the heating operation of the refrigeration compartment is performed only when necessary, the amount of energy consumed in an unnecessary operation can be minimized. Accordingly, efficiency in operation of a refrigerator can be improved, and defects, such as crack formation in welded joints of the main body due to sharp temperature changes of the refrigerating compartment and the evaporator, can be prevented.  
         [0065]     As described above, in accordance with the operation control method of a refrigerator of the embodiment of the present invention, it is possible to reduce energy consumption and thus improve efficiency in operation of the refrigerator by preventing the unnecessary cooling and heating operation performed in the refrigerating compartment for the purpose of preventing the over-cooling of the refrigerating compartment when the surrounding air temperature is in the low temperature state.  
         [0066]     Although an embodiment of the present invention has been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.