With prolonged operation of a typical refrigerator, frost layer begins to develop on the surface of the cold side heat exchanger, or the evaporator. With increasing thickness of the frost layer, the heat exchanger efficiency is also adversely affected due to increase in heat transfer resistance. In ...
With prolonged operation of a typical refrigerator, frost layer begins to develop on the surface of the cold side heat exchanger, or the evaporator. With increasing thickness of the frost layer, the heat exchanger efficiency is also adversely affected due to increase in heat transfer resistance. In order to prevent the frost layer formation, heaters are typically displaced alongside the heat exchanger surface and operated at regular intervals. The melted frost, or the defrost water, formed by the heater operation, is drained to the drain water tray located inside the machine room. As a result of the waste heat generated by different components, such as the compressor, in the machine room and passing airflow from the fan, defrost water inside the tray slowly evaporates and eventually depletes. In the current study, a kimchi refrigerator was used to investigate the parameters that are most crucial to the defrost water evaporation process and a regression model was derived through designed experimental studies with varying parameters. Through parametric studies, it was found that the most important factors are joint pipe calorie, joint pipe height, water tray area and fan velocity, listed from the most important to least important. Among these parameters, joint pipe calorie is directly linked to the compressor operation and could not be explicitly controlled for the purpose of the current study. Consequently, it was concluded that optimizing the joint pipe height was the most important parameter which influenced the defrost water evaporation. Through investigation on underlying theoretical principles behind the defrost water evaporation, it was found that the evaporation mechanism is dominated by molecular diffusion rather than convective mass transfer due to moving air flow. As a result, a modeling study was conducted utilizing the Stefan Law and a good match was found between the simulation and experimental results.
With prolonged operation of a typical refrigerator, frost layer begins to develop on the surface of the cold side heat exchanger, or the evaporator. With increasing thickness of the frost layer, the heat exchanger efficiency is also adversely affected due to increase in heat transfer resistance. In order to prevent the frost layer formation, heaters are typically displaced alongside the heat exchanger surface and operated at regular intervals. The melted frost, or the defrost water, formed by the heater operation, is drained to the drain water tray located inside the machine room. As a result of the waste heat generated by different components, such as the compressor, in the machine room and passing airflow from the fan, defrost water inside the tray slowly evaporates and eventually depletes. In the current study, a kimchi refrigerator was used to investigate the parameters that are most crucial to the defrost water evaporation process and a regression model was derived through designed experimental studies with varying parameters. Through parametric studies, it was found that the most important factors are joint pipe calorie, joint pipe height, water tray area and fan velocity, listed from the most important to least important. Among these parameters, joint pipe calorie is directly linked to the compressor operation and could not be explicitly controlled for the purpose of the current study. Consequently, it was concluded that optimizing the joint pipe height was the most important parameter which influenced the defrost water evaporation. Through investigation on underlying theoretical principles behind the defrost water evaporation, it was found that the evaporation mechanism is dominated by molecular diffusion rather than convective mass transfer due to moving air flow. As a result, a modeling study was conducted utilizing the Stefan Law and a good match was found between the simulation and experimental results.
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