Energy saving in household refrigerators becomes more important as the usage of household refrigerators have been increasing every year. Since a compressor in the refrigerator consumes more than 80% of its total energy, it is necessary to reduce the energy consumption of the compressor. In this paper, the convective heat transfer coefficients on the compressor housing for both natural convection and forced convection were measured. Then, the effect of convective heat transfer coefficient on the power consumption of a refrigerator was investigated using a thermal management analysis. The results showed that convective heat transfer coefficient for forced convection is higher by 7.8 W/m²K compared to the natural convection. In addition, through the thermal management analysis, it was found that the increase in convective heat transfer coefficient reduces the refrigerator power by about 4.8% improving EER by 0.9%.

For years, many beauty industries have been developed many beauty treatment machines in healthcare. It is respond to increased demand for new health technologies aimed at assisting aging populations, promoting public health, and improving quality of life. The purpose of this study was to develop the cooling treatment machine to be operators in clinical and beauty treatment use. The developed machine can an be helpful for skin soothing treatment of skin care shop and cosmetic surgery in beauty industries.