Air-conditioning controlling method and device

Abstract

A dew-point temperature sensor is provided in a data center. In an air-conditioning controlling device, a lower limit value for a supply air temperature wherein there is no danger of the occurrence of condensation within a data center is calculated from a dew-point temperature (an inside dew-point temperature) that is measured by the dew-point temperature sensor, and a setting value for the supply air temperature and a setting value for the supply air flow rate into the data center the from the air-conditioning device are determined based on the calculated lower limit value for the supply air temperature. Note that a dew-point temperature for the exhaust air from within the data center, a dew-point temperature for the supply air into the data center from the outside conditioning equipment, or a dew-point temperature of the outside air may be used instead of the inside dew-point temperature.

1 . An air-conditioning controlling method for controlling a supply air temperature and a supply air flow rate from an air-conditioning device to a room that is subject to control, wherein a room wherein is placed equipment wherein there is the danger of occurrence of physical damage through condensation is placed is the room that is subject to control, comprising the steps of:
 measuring a dew-point temperature of the room that is subject to control;   calculating a lower limit value for a supply air temperature wherein there is no danger of the occurrence of condensation in the room that is subject to control;   determining a setting value for the supply air temperature based on the calculated lower limit value for the supply air temperature; and   determining a setting value for the supply air flow based on the calculated lower limit value for the supply air temperature.   
     
     
         2 . The air-conditioning controlling method as set forth in  claim 1 , wherein:
 the step for determining the setting value for the supply air temperature uses a lower limit value for the supply air temperature that is constrained by a. capability of the air-conditioning device as an equipment-constrained supply air temperature lower limit value, and compares the equipment-constrained supply air temperature lower limit value to the calculated supply air temperature lower limit value and selects the higher supply air lower limit value as the setting value for the supply air temperature.   
     
     
         3 . The air-conditioning controlling method as set forth in  claim 1 , wherein:
 instead of the step for measuring the dew-point temperature of the room that is subject to control, a step is provided for measuring a dew-point temperature of exhaust air from the room that is subject to control, a dew-point temperature of supply air, from an outside conditioning equipment that processes outside air and supplies it to the room that is subject to control, or a dew-point temperature of the outside air.   
     
     
         4 . An air-conditioning controlling device for controlling a supply air temperature and a supply air flow rate from an air-conditioning device to a room that is subject to control, wherein a room wherein is placed equipment wherein there is the danger of occurrence of physical damage through condensation is placed is the room that is subject to control, comprising:
 a dew-point temperature measurer measuring a dew-point temperature of the room that is subject to control;   a supply air temperature lower limit value calculator calculating a lower limit value for a supply air temperature wherein there is no danger of the occurrence of condensation in the room that is subject to control;   a supply air temperature setting value determiner determining a setting value for the supply air temperature based on the calculated lower limit value for the supply air temperature; and   a supply air flow rate setting value determiner determining a setting value for the supply air flow based on the calculated lower limit value for the supply air temperature.   
     
     
         5 . The air-conditioning controlling device as set forth in  claim 4 , wherein:
 the supply air temperature setting value determiner means use a lower limit value for the supply air temperature that is constrained by a capability of the air-conditioning device as an equipment-constrained supply air temperature lower limit value, and compare the equipment-constrained supply air temperature lower limit value to the calculated supply air temperature lower limit value and select the higher supply air lower limit value as the setting value for the supply air temperature.   
     
     
         6 . The air-conditioning controlling device as set forth in  claim 4 , wherein:
 instead of the dew-point temperature measurer measuring the dew-point temperature of the room that is subject to control, the dew-point temperature measurer measuring a dew-point temperature of exhaust air from the room that is subject to control, a dew-point temperature of supply air, from an outside conditioning equipment that processes outside air and supplies it to the room that is subject to control, or a dew-point temperature of the outside air.