Human basically wants to keep comfortable life. Since it was endless effort to orient economic evolution and improvement of life level, human is requiring more enjoyable life - environment in the modern. Thus, with general improvement of life level in the end 20th, refrigerating and air conditioning industrial, like refrigerator, air conditioner and more, have developed continuatively. Therefore air conditioner has widely supplied to home use from industrial use. those air conditioners have been researched by now.
Refrigerating and air conditioning industrial are actively moving that protecting to understate environment - effect for global environment, developing to be miniatured and be functioned for product, endeavoring to develop new technology by situation of demander but above all, they are emphasizing high efficiency of energy saving.
As this point, They have widely researched to protect to grow frost in the evaporator of refrigerator and air conditioner and efficiently defrost to save energy. but those research are not much really existed.
Therefore, We estimated mechanism about developing process of frost layer and defrosting in the evaporator through this experiments, it was researched severally inlet air temperature 15℃, 20℃, 25℃, inlet air velocity 0.3m/s, 0.6m/s, 0.9m/s and relative humidity 70%, 80%, 90%.