| 摘要 |
<p>An air conditioning system is provided to improve the performance and operation stability by varying the control mode of the first expansion device for regulating the middle pressure according to the overheating degree of refrigerant. An air conditioning system comprises a condenser in which refrigerant is condensed, a first expansion valve(141) in which the refrigerant passing through the condenser is throttled, a second expansion valve(142) in which the refrigerant passing through the first expansion valve is throttled, an evaporator in which the refrigerant passing through the second expansion valve is vaporized, a compressor(110) in which the refrigerant passing through the evaporator and the refrigerant which is branched and injected between the first and the second expansion valve are compressed, an injection valve(143) in which the refrigerant branched between the first and the second expansion valve and injected to the compressor is throttled, and a control part switching the first expansion valve between a first control mode and a second control mode.</p> |
