| 摘要 |
<p>A diagnostic and protection system comprises a compressor (10) for a refrigeration circuit and includs an electric motor, a current sensor (66) for detecting the current supplied to said motor, a discharge line temperature sensor (68) and a processing circuitry (70). The processing circuitry (70) has stored the relationship between the current supplied to said motor (compressor power) and the condenser temperature (Tcond). Said processing circuitry uses the current data from said current sensor to determine the condenser temperature (Tcond) based on said relationship ( figure 19 ). Once the condenser temperature is known, the exact evaporator temperature (Tevap) can be determined by plotting discharge line temperature versus condenser temperature ( figure 20 ). The compressor capacity can be determined for different evaporator temperatures (Tevap) by plotting compressor capacity versus condenser temperature (Tcond) ( figure 23 ).</p> |
