| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multi-split type air conditioning system that quickly constructs an optimum operation point in heating operation, stabilizes the number of rotation of a compressor for inverter control and, thereby, permits the operation of a high COP. <P>SOLUTION: In the multi-split type air conditioning system AC, a plurality of indoor units 30 are connected in parallel, a receiver 20 is installed on the upstream side of an outdoor heat exchanger 12 serving as an evaporator in heating operation, and an outdoor unit electronic expansion valve 21 is installed between the receiver 20 and the outdoor heat exchanger 12, wherein an opening degree control mode in heating operation of the outdoor unit electronic expansion valve 21 installed on a control unit 50 has an open-loop control which is operated during a prescribed time at an outdoor unit electronic expansion valve provisional opening degree set in accordance with a real rotation number of a variable power operated compressor 11, stipulated by the operation number of indoor units 30 and external air conditions and, as parameters for calculating the outdoor unit electronic expansion valve provisional opening degree, an outdoor temperature, the total heat exchange capacity of the indoor heat exchanger 30, the number of stoppage of the indoor heat exchangers 30 and suction superheating and discharge superheating of the variable-power operated compressor 11 are used. <P>COPYRIGHT: (C)2013,JPO&INPIT |
