Air-conditioning control unit

Abstract

An air-conditioning control unit ( 26 ) controls the airflow distributing door ( 16 ), a first indoor heat exchanger ( 10 ) is provided in the first air passage ( 21 ) and a second indoor heat exchanger ( 4 ) is provided in the second air passage ( 22 ). in adjusting air sent from the first air passage ( 21 ) is distributed into the second air passage ( 22 ) and the third air passage ( 23 ) by controlling the airflow distributing door ( 16 ). In switching from the cooling operation state to the heating operation state, the flow of the adjusting air in the second air passage ( 22 ) is increased by controlling the airflow distributing door ( 16 ) by the air-conditioning control unit ( 26 ) prior to the switching of refrigerant circuit from the cooling control mode to the heating control mode.

1 . An air-conditioning control unit ( 26 ) used in an air conditioning system ( 1 ) which comprises: 
 a refrigerant circuit ( 2 );    a first indoor heat exchanger ( 10 ) having a low refrigerant temperature;    a second indoor heat exchanger ( 4 ) having a high refrigerant temperature;    controlled components ( 5 ,  12 );    a first air passage ( 21 ); and    a second air passage ( 22 ) and a third air passage ( 23 ) which are distributed by an airflow distributing door ( 16 ) from the first air passage ( 21 ),    wherein the air-conditioning control unit ( 26 ) controls the controlled components ( 5 ,  12 ) and the airflow distributing door ( 16 ):    wherein the first indoor heat exchanger ( 10 ) is provided in the first air passage ( 21 );    wherein the second indoor heat exchanger ( 4 ) is provided in the second air passage ( 22 );    wherein adjusting air sent from the first air passage ( 21 ) is distributed into the second air passage ( 22 ) and the air passage ( 23 ) by controlling the airflow distributing door ( 16 );    wherein switching is carried out between an air flowing state during heating in which air is distributed mainly into the second air passage ( 22 ) and an air flowing state during cooling in which air is distributed mainly into the third air passage ( 23 );    wherein switching between a cooling operation state and a heating operation state is carried out by controlling the controlled components ( 5 ,  12 ) and thereby performing switching between a cooling control mode and a heating control mode in the refrigerant circuit ( 2 ); and    wherein, in switching from the cooling operation state to the heating operation state, the flow of the adjusting air in the second air passage ( 22 ) is increased by controlling the airflow distributing door ( 16 ) by the air-conditioning control unit ( 26 ) prior to the switching of refrigerant circuit from the cooling control mode to the heating control mode.    
   
   
       2 . An air-conditioning control unit ( 26 ) as stated in  claim 1 , wherein the airflow distributing door ( 16 ) is controlled so as to flow smaller quantity of adjusting air into the second air passage ( 22 ) than the air flowing into the third air passage ( 23 ) in the air flowing state during cooling.  
   
   
       3 . An air-conditioning control unit as stated in  claim 1 , wherein the airflow distributing door ( 16 ) is controlled so as to flow smaller quantity of adjusting air into the third air passage ( 23 ) than the air flowing into the second air passage ( 22 ) in the air flowing state during heating.  
   
   
       4 . An air-conditioning control unit as stated in  claim 3 , wherein the second air passage ( 22 ) is connected to an air outlet on the lower side in the room and the third air passage ( 23 ) is connected to an air outlet on the upper side in the room.  
   
   
       5 . An air-conditioning control unit as stated in  claim 1 , wherein position of the airflow distributing door ( 16 ) is changed so as to decrease a difference between blowing temperature of the adjusting air and control target temperature.