The working principle of stuffy dry type cooker
The radiant energy of the sun, mostly visible light and near infrared, almost all can through plate glass. When sunlight through the glass into insulation casing, meet a black absorber is converted into heat energy. Thermal radiation is also a form of physical exercise, mainly for the infrared radiation, and its wavelength is longer, just can prevent long wave through glass, double deck glass installation, harder through infrared radiation. At the same time, the body all around and the bottom has the thermal insulation material, avoid thermal radiation to escape. Glass up to shortwave sunlight into, don't let the long wave infrared out. To the best of the jurisdiction of the total for dissipating heat, but the temperature in the cabinet as a continuation of the stuffy dry time, will gradually heating up, until a balance. This kind of solar oven of the highest temperature in the cabinet depends on the merits of the thermal insulation material. Usually adopt cotton insulation, up to 150 ℃ or so. The temperature's enough for cooking use. If choose better thermal insulation material, it will increase the cost of a solar oven, economically not economical. In order to improve the effect of stuffy dry type cooker series, shortening the time of rush sun, or prevent the cloudy weather affects the oven temperature, can add mirror against the side of box, and increase the light area; Can also be on the bottom metal tank, with the aid of mooring heat accumulation effect, stable sun intermittent illuminate when the temperature in the cabinet. Under the conditions allow, covering the surface of the glass can add a layer of spectral selective material such as silica, to change the absorption and emission of sunshine, improve the efficiency of a solar oven.
Stuffy dry type too positive for the temperature in the cabinet is gradually accumulated, and greatly influenced by wind speed. When used to prevent heat loss, pay attention to the place where the xiangyang lee.
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