Refigerant system and a control method the same

Abstract

The present invention relates to the refrigerant system in which the refrigerant amount stored in the accumulator may be adjusted by the super cooling adjustment unit according to the indoor conditioning load. Therefore, according to the present invention, the flow refrigerant amount on the refrigerant cycle may be optimally adjusted according to the indoor conditioning load, and there is an advantage that the operation efficiency may be more improved.

1 . A refrigerant system, comprising:
 a compressor which compresses a refrigerant;   a condenser which condenses the refrigerant discharged from the compressor;   an expanding unit which expands the refrigerant passed through the condenser,   an evaporator which evaporates the refrigerant passed through the expanding unit;   a main refrigerant pipe which forms a refrigerant cycle by connecting the compressor, the condenser, the expanding unit and the evaporator;   an accumulator filtering a liquid refrigerant among refrigerants flowing into the compressor;   a super cooler in which a portion of the refrigerants is distributed to super cool the refrigerant of the main refrigerant pipe, the super cooler configured to guide to introduce the portion into the accumulator;   a super cooling adjustment unit which adjusts a portion of refrigerant amount passed through the super cooler; and   a control unit which controls refrigerant amount stored in the accumulator by the super cooling adjustment unit so that flow refrigerant amount on the refrigerant cycle is optimized according to operation states; and   
     
     
         2 . The refrigerant system according to  claim 1 , wherein the control unit controls the super cooling adjustment unit to increase or decrease the refrigerant amount stored in the accumulator according to an indoor conditioning load. 
     
     
         3 . The refrigerant system according to  claim 2 , wherein the control unit controls the super cooling adjustment unit to decrease the refrigerant amount stored in the accumulator when the indoor conditioning load is increased, and,
 the control unit controls the super cooling adjustment unit to increase the refrigerant amount stored in the accumulator when the indoor conditioning load is decreased.   
     
     
         4 . The refrigerant system according to  claim 2 , further comprising:
 a high pressure detection unit which detects high pressure of refrigerants in the discharge side of the compressor; and   a super cooling degree detection unit which detects a refrigerant super cooling degree of a discharge side of the condenser,   wherein the control unit controls the super cooling adjustment unit to adjust the refrigerant amount stored in the accumulator according to at least one of the high pressure of refrigerants and the refrigerant super cooling degree when the indoor conditioning load is decreased   
     
     
         5 . The refrigerant system according to  claim 4 , wherein the control unit controls the super cooling adjustment unit to decrease the refrigerant amount stored in the accumulator when the high pressure of refrigerants is equal to or higher than a reference high pressure, and
 the control unit controls the super cooling adjustment unit to increase the refrigerant amount stored in the accumulator when the high pressure of refrigerants is lower than the reference high pressure.   
     
     
         6 . The refrigerant system according to  claim 4 , wherein
 the control unit controls the super cooling adjustment unit to decrease flow refrigerant amount on the refrigerant cycle when the refrigerant super cooling degree is equal to or higher than a reference super cooling degree, and   the control unit controls the super cooling adjustment unit to increase the flow refrigerant amount on the refrigerant cycle when the refrigerant super cooling degree is lower than the reference super cooling degree.   
     
     
         7 . The refrigerant system according to  claim 1 , further comprising:
 a refrigerant amount detection unit which detects refrigerant amount stored in the accumulator.   
     
     
         8 . The refrigerant system according to  claim 7 , wherein the refrigerant amount detection unit includes:
 a first detection unit which detects whether the a refrigerant water level of the accumulator is lower than a first water level, and   a second detection unit which is separately disposed into the upper side of the first detection unit to detect whether the refrigerant water level of the accumulator is equal to or higher than a second water level.   
     
     
         9 . The refrigerant system according to  claim 8 , wherein the control unit controls such that an open degree of the super cooling adjustment unit is decreased when the refrigerant water level stored in the accumulator is higher than the first water level. 
     
     
         10 . The refrigerant system according to  claim 9 , wherein the first water level is a level corresponded to a minimum of storage amount of the allowable refrigerants to be stored in the accumulator. 
     
     
         11 . The refrigerant system according to  claim 8 , wherein the control unit controls such that the open degree of the super cooling adjustment unit is increased when the refrigerant water level stored in the accumulator is lower than the second water level. 
     
     
         12 . The refrigerant system according to  claim 11 , wherein the second water level is a level corresponded to a maximum of storage amount of the allowable refrigerants to be stored in the accumulator. 
     
     
         13 . The refrigerant system according to  claim 1 , wherein the super cooler includes a bypass pipe which bypasses the portion of refrigerants passed through the condenser to guide the portion into an inlet side of the accumulator, and
 a super cooling heat exchanger which performs the heat-exchange between the portion of the refrigerants bypassed and the refrigerant of the main refrigerant pipe.   
     
     
         14 . The refrigerant system according to  claim 2 , wherein the control unit controls such that the open degree of the super cooling adjustment is closed or decreased during converting the cooling operation into the heating operation. 
     
     
         15 . A control method of a refrigerant system comprising a compressor, a condenser, an expanding unit and an evaporator, the refrigerant system includes a refrigerant cycle which performs the conversion of cooling or heating operations, a refrigerant pipe which guides the refrigerant circulating the refrigerant cycle, and an accumulator which filters a liquid refrigerant of the refrigerants introduced into the compressor, the control method comprising:
 detecting a discharge pressure of the compressor;   detecting the refrigerant amount stored in the accumulator;   comparing the detected discharge pressure or refrigerant amount with a predetermined reference value; and   adjusting refrigerant amount introduced into the accumulator, among refrigerants circulating the refrigerant pipe, based on a compared result.   
     
     
         16 . The control method according to  claim 15 , wherein
 the refrigerant amount introduced into the accumulator is decreased when the discharge pressure is lower than the reference pressure and the refrigerant amount is higher than the predetermined minimum storage amount, during the cooling or heating operation.   
     
     
         17 . The control method according to  claim 15 , wherein
 the refrigerant amount introduced into the accumulator is increased when the discharge pressure is higher than the reference pressure and the refrigerant amount is lower than the predetermined maximum storage amount, during the cooling or heating operation.   
     
     
         18 . The control method according to  claim 15 , further comprising detecting a super cooling degree passed through the condenser during the cooling operation,
 wherein refrigerant amount introduced into the accumulator is decreased when a detected super cooling degree is lower than the reference super cooling degree and a detected discharge pressure is lower than the reference pressure.   
     
     
         19 . The control method according to  claim 18 , wherein
 the refrigerant amount introduced into the accumulator is maintained or increased when the detected super cooling degree is lower than the reference super cooling degree and the detected discharge pressure is higher than the reference pressure.   
     
     
         20 . The control method according to  claim 18 , wherein
 the refrigerant amount introduced into the accumulator is increased when the detected super cooling degree is higher than the reference super cooling degree and the detected refrigerant amount is lower than the predetermined maximum storage amount.   
     
     
         21 . The control method according to  claim 18 , wherein
 the refrigerant amount introduced into the accumulator is decreased when the detected super cooling degree is lower than the reference super cooling degree and the detected refrigerant amount is higher than the predetermined minimum storage amount.