| 摘要 |
<p>A change in the liquid level of a liquid refrigerant in an evaporator is detected. Above the liquid refrigerant, a vaporous refrigerant is present. A temperature sensor measures a temperature which is compared to a reference temperature. At a first point in time, the liquid level of the liquid refrigerant is above the temperature sensor and it is found that the temperature measured by the temperature sensor is substantially equal to the reference temperature. After the first point in time, vaporous refrigerant is discharged via the discharge of the evaporator and liquid refrigerant evaporates in the evaporator, so that the liquid level in the evaporator drops. When the liquid level drops below the temperature sensor, an amount of the liquid refrigerant adheres to the temperature sensor and the temperature sensor cools down as a result of evaporation of the adhering liquid refrigerant and it is found that the temperature measured by the temperature sensor is lower than the reference temperature.</p> |
