| Title |
An Experimental Study on the Impact of Environmental Change on the Freezing of Automotive Air Conditioner Evaporator |
| DOI |
https://doi.org/10.6110/KJACR.2019.31.10.445 |
| Keywords |
에어컨 시스템; 증발기; 결빙; 냉매 충진량; 표면 온도 Air-conditioning system; Evaporator; Freezing; Refrigerant charge quantity; Surface temperature |
| Abstract |
For successful design of an automobile air-conditioning system, the evaporator is the main component and ensuring the integrity of the freezing process is critical in maintaining reliable performance. In this study, the changes in environment, a lack of refrigerant charge amount with time when the vehicle is released, the changes in outdoor temperature, and the evaporator freezing with change of the air handler unit (AHU) airflow, are examined. Also, this study conducted the surface temperature of the evaporator and the effect of environmental factors on the freezing mechanism, according to the refrigerant flow pattern inside the evaporator. If the refrigerant flow which flows inside the evaporator would not be stable, causing the deviation of surface temperature of the evaporator, the refrigerant charge amount is reduced by 50%. As a result, the evaporator is likely to be froze due to temperature difference of actual an subzero point and measured value of the temperature sensor. The lower the outdoor temperature in the evaporator, the easier for evaporator to freeze due to the small cooling load. This paper’s analysis on the evaporator freezing mechanism of a variety of condition of air-conditioning systems and condition of usage will be valuable in creating robust designs relative to the prevention of evaporator freezing. |