Cooling system

Abstract

A cooling system comprising an intake air temperature sensor which measures an intake air temperature to an evaporator by a blower; a return air temperature sensor which measures a return air temperature which is cooled in the evaporator; and a blower frequency switching device which switches a frequency of the blower, wherein the blower frequency switching device controls the frequency of the blower to a frequency of the blower corresponding to a difference between an intake air temperature which is measured by an intake air temperature sensor and a return air temperature which is measured by a return air temperature sensor.

1 . A cooling system comprising:
 a plurality of racks which are loaded with a plurality of electronic devices, have structures capable of passing air in front surfaces and rear surfaces, and are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   an evaporator which is installed between the racks, vaporizes a refrigerant by heat exchange with high-temperature exhaust air from the racks, and cools the high-temperature exhaust air;   a blower which supplies the high-temperature exhaust air from the racks to the evaporator;   a cooling apparatus with the evaporator and the blower incorporated therein;   a condenser which is installed at a place higher than the evaporator and liquefies the vaporized refrigerant;   gas piping which feeds a refrigerant gas vaporized in the evaporator to the condenser;   liquid piping which feeds a refrigerant liquid liquefied in the condenser to the evaporator;   a cold water pump which supplies cold water to the condenser;   a cold water piping which connects the condenser and the cold water pump;   a natural circulation mechanism which naturally circulates the refrigerant between the evaporator and the condenser;   an intake air temperature sensor which measures an intake air temperature to the evaporator by the blower;   a return air temperature sensor which measures a return air temperature which is cooled in the evaporator; and   a blower frequency switching device which switches a frequency of the blower,   wherein the blower frequency switching device controls the frequency of the blower to a frequency of the blower corresponding to a difference between the intake air temperature which is measured by the intake air temperature sensor and the return air temperature which is measured by the return air temperature sensor.   
     
     
         2 . The cooling system according to  claim 1 ,
 wherein the blower frequency switching device comprises a required air blow quantity calculating device which calculates a required air blow quantity of the blower, and   the required air blow quantity calculating device calculates a thermal load from detected values of the intake air temperature sensor and the return air temperature sensor, and controls the frequency of the blower to a frequency necessary for thermal load processing.   
     
     
         3 . The cooling system according to  claim 1 , further comprising:
 a rack intake air temperature sensor which measures a rack intake air temperature within a range assigned to the cooling apparatus,   wherein the blower frequency switching device increases the air blow quantity of the blower when the detected value of the rack intake air temperature sensor is a predetermined value or above.   
     
     
         4 . The cooling system according to  claim 2 , further comprising:
 a rack intake air temperature sensor which measures a rack intake air temperature within a range assigned to the cooling apparatus,   wherein the blower frequency switching device increases the air blow quantity of the blower when the detected value of the rack intake air temperature sensor is a predetermined value or above.   
     
     
         5 . The cooling system according to  claim 1 , further comprising:
 a refrigerant temperature sensor which measures a refrigerant temperature at an outlet port of the condenser; and   a required refrigerant temperature calculating device which calculates a required condenser refrigerant temperature from the frequency of the blower and a cooling performance table,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and sets a set value of a refrigerant temperature of the condenser at a calculated value.   
     
     
         6 . The cooling system according to  claim 2 , further comprising:
 a refrigerant temperature sensor which measures a refrigerant temperature at an outlet port of the condenser; and   a required refrigerant temperature calculating device which calculates a required condenser refrigerant temperature from the frequency of the blower and a cooling performance table,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and sets a set value of a refrigerant temperature of the condenser at a calculated value.   
     
     
         7 . The cooling system according to  claim 3 , further comprising:
 a refrigerant temperature sensor which measures a refrigerant temperature at an outlet port of the condenser; and   a required refrigerant temperature calculating device which calculates a required condenser refrigerant temperature from the frequency of the blower and a cooling performance table,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and sets a set value of a refrigerant temperature of the condenser at a calculated value.   
     
     
         8 . The cooling system according to  claim 4 , further comprising:
 a refrigerant temperature sensor which measures a refrigerant temperature at an outlet port of the condenser; and   a required refrigerant temperature calculating device which calculates a required condenser refrigerant temperature from the frequency of the blower and a cooling performance table,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and sets a set value of a refrigerant temperature of the condenser at a calculated value.   
     
     
         9 . The cooling system according to  claim 1 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         10 . The cooling system according to  claim 2 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         11 . The cooling system according to  claim 3 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces arc aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         12 . The cooling system according to  claim 4 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         13 . The cooling system according to  claim 5 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces arc aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         14 . The cooling system according to  claim 6 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         15 . The cooling system according to  claim 7 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.   
     
     
         16 . The cooling system according to  claim 8 , further comprising:
 a computer room in which the plurality of racks are arranged so that respective air intake surfaces are aligned with one another and respective air exhaust surfaces are aligned with one another;   a device which detects an indoor dew point temperature of the computer room,   wherein the required refrigerant temperature calculating device calculates a required condenser refrigerant temperature from the frequency of the blower and the cooling performance table, and changes a set value of the condenser refrigerant temperature to a calculated value when the calculated value is the indoor dew point temperature or above, and changes the set value of the condenser refrigerant temperature to the indoor dew point temperature when the calculated value is the indoor dew point temperature or below.