| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To determine excess or shortage of the amount of sealed refrigerant at low costs without adding a special component. <P>SOLUTION: This air conditioner comprises a refrigerating cycle having a compressor, a radiator, a pressure reducer and an evaporator, and applying a carbon dioxide gas as a refrigerant, and further comprises a pressure sensor for detecting a discharged refrigerant pressure Pd of the compressor, a first refrigerant temperature sensor for detecting a discharged refrigerant temperature Td of the compressor, and a low pressure-side pressure recognizing means for estimating a refrigerant pressure Ps at a low pressure side of the refrigerating cycle. A maximum allowable discharge refrigerant temperature Td' is determined from the low pressure-side refrigerant pressure Ps recognized by the low pressure-side pressure recognizing means and the discharge refrigerant pressure Pd of the compressor detected by the pressure sensor, and the excess or shortage of the amount of refrigerant sealed in the refrigerating cycle is determined by comparing the allowable discharge refrigerant temperature Td' and the detected discharge refrigerant temperature Td detected by the discharge refrigerant temperature detecting means. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
