http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
O. Promsod,A. Kongtana,K. Kotmool 국제과학영재학회 2010 APEC Youth Scientist Journal Vol.2 No.-
The solar oven is an invention used for cooking. This is one way to reduce using electric energy by using renewable energy: solar energy. The purpose of this study is to compare the effects of pressure on the efficiency of the solar oven. The oven is made in a 30-centimeterdiameter cylinder shape from 1.25-millimeter-thick iron and covered with heat resistor. The cover is made with 8-millimeter-thick transparent acrylic that has a transmitting efficiency of about 0.80. The ratio of the volume of the oven per area of cover is 13.75. In addition, this oven has a reflector that can adjust the angle for proper sunlight direction to come inside the solar oven. In this experiment, we compared experiments at pressures of 1 and 2 atm by increasing the air inside the solar oven. At 2 atm, the temperatures of air and water had trended to steady state faster than at 1 atm .The heat efficiency of water in higher pressure was greater, while the temperature at 2 atm was more stable than that at 1 atm.