Method for controling air flow rate of air conditioning system

Abstract

Method for controlling an air flow rate of an air conditioning system, including the steps of measuring a concentration of volatile organic compounds in air periodically, calculating a value of concentration change from concentration values measured at the present time and in the past, and controlling the flow rate of air for cleaning or ventilating a room with reference to the present concentration and value of concentration change, whereby controlling a flow rate of room cleaning or ventilating air to cope, not only with concentration of organic compounds, but also with rapid change of the concentration of the organic compounds in the air.

1 . A method for controlling an air flow rate of an air conditioning system, comprising the steps of: 
 (a) measuring a concentration of volatile organic compounds in air, periodically;    (b) calculating a value of concentration change from concentration values measured at the present time and in the past; and    (c) controlling the flow rate of air for cleaning or ventilating a room with reference to the present concentration and value of concentration change.    
   
   
       2 . The method as claimed in  claim 1 , wherein the value of concentration change in the step (b) is a difference of a concentration value measured at the present time and a concentration value measured right before.  
   
   
       3 . The method as claimed in  claim 1 , wherein the flow rate of the air for cleaning or ventilating a room includes a highest flow rate, a high flow rate, a medium flow rate, and a lowest flow rate.  
   
   
       4 . The method as claimed in  claim 3 , wherein the flow rate of the air for cleaning or ventilating a room is controlled to be the highest flow rate when the concentration value is high, and the value of concentration change is high or medium.  
   
   
       5 . The method as claimed in  claim 3 , wherein the flow rate of the air for cleaning or ventilating a room is controlled to be the high flow rate when the concentration value is high, and the value of concentration change is low, or the concentration value is medium, and the value of concentration change is high.  
   
   
       6 . The method as claimed in  claim 3 , wherein the flow rate of the air for cleaning or ventilating a room is controlled to be the medium flow rate when the concentration value is medium, and the value of concentration change is medium or low, or the concentration value is low, and the value of concentration change is high.  
   
   
       7 . The method as claimed in  claim 3 , wherein the flow rate of the air for cleaning or ventilating a room is controlled to be the lowest flow rate when the concentration value is low, and the value of concentration change is medium of low.  
   
   
       8 . The method as claimed in  claim 1 , wherein the flow rate of the air for cleaning the room is controlled by controlling a rotation speed of a fan which draws air from the room and discharges the air to the room, again.  
   
   
       9 . The method as claimed in  claim 1 , wherein the flow rate of the air for ventilating the room is controlled by controlling a rotation speed of a fan which draws outdoor air and discharges the outdoor air to the room.  
   
   
       10 . The method as claimed in  claim 1 , wherein the flow rate of the air for ventilating the room is controlled by controlling a rotation speed of a fan which draws room air and discharges the room air to an outside of the room.  
   
   
       11 . The method as claimed in  claim 1 , wherein the step (c) includes the steps of; 
 (c1) determining a level of the concentration value measured at the present time,    (c2) determining a level of the value of the concentration change calculated at the present time, and    (c3) controlling a rotation speed of at least one of a first fan for supplying air to the room and a second fan for discharging air from the room with reference to the levels of the concentration value and the value of the concentration change.    
   
   
       12 . The method as claimed in  claim 11 , wherein the step (c1) includes the step of comparing the measured concentration value to various reference values.  
   
   
       13 . The method as claimed in  claim 11 , wherein the step (c2) includes the step of comparing the calculated value of concentration change to various reference values.  
   
   
       14 . The method as claimed in  claim 11 , wherein the first fan and the second fan rotate at one of speeds inclusive of a highest speed, a high speed, a medium speed, and a lowest speed, respectively.  
   
   
       15 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the highest speed when the concentration value is high, and the value of the concentration change is high or medium.  
   
   
       16 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the high speed when the concentration value is high, and the value of the concentration change is low.  
   
   
       17 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the high speed when the concentration value is medium, and the value of the concentration change is high.  
   
   
       18 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the medium speed when the concentration value is medium, and the value of the concentration change is medium or low.  
   
   
       19 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the medium speed when the concentration value is low, and the value of the concentration change is high.  
   
   
       20 . The method as claimed in  claim 14 , wherein the (c3) step includes the step of rotating at least one of the first fan and the second fan at the lowest speed when the concentration value is low, and the value of the concentration change is medium or low.