空調機量化故障診斷器研製
| Autor: | HSU,YI-CHENG, 徐懿成 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 With the use of Programming Logic Control (PLC) and man-machine interface, the phenomena of too little and too much refrigerant of air-conditioner, poor heat exchange of evaporator, poor heat dissipation of condenser and other system faults were actually simulated in this paper for the record of operation data, then quantitative analysis was adopted to obtain the method to quantify faults. According to the results, with the refrigerant amount of 33%, the pressure in high voltage terminal declines by only 60%, the pressure in low voltage terminal declines by only 20%; in terms of temperature, only when there is significant decline in condenser outlet, capillary inlet and evaporator outlet, it can be judged to be the system fault of insufficient refrigerant. In case of the temperature in evaporator air outlet greater than standard value, the fault is caused by insufficient refrigerant; in case of the temperature in evaporator air outlet smaller than standard value, the fault can be judged to be the poor heat exchange of evaporator; at this time, when heat exchange area is 20% and 0%, there is only about 90% and 78% pressure left in high voltage terminal and 95% and 50% pressure in low voltage terminal, the temperature in evaporator inlet and evaporator outlet declines simultaneously. Moreover, the state of too much refrigerant and poor heat exchange of condenser can be known from the pressure in high voltage terminal, compressor outlet, condenser inlet, condenser outlet and capillary inlet. When the rising temperature in the capillary inlet is greater than standard value, the fault can be judged to be poor heat dissipation of condenser; when the declining temperature is smaller than standard value, the fault can be judged to be too much refrigerant. In conclusion, through the calculation and judgment of values of capillary inlet and evaporator air outlet in the fault diagnosis apparatus, the quantization level for the faults of too little and too much refrigerant obtained by man-machine interface, poor heat exchange of evaporator, poor heat dissipation of condenser and other system faults can be gained. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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