Turtle is widely favored in the market because of its rich nutritional value and medicinal value. Its breeding methods are divided into pond culture

Solar collector is defined as a device that absorbs solar radiation and transfers the generated heat energy to the heat transfer medium. This short definition contains rich meanings: first, solar collector is a device; Second: solar collectors can absorb solar radiation; Third: the sun

In view of the gap in technology and quality between domestic and foreign solar collectors, the following measures should be taken to improve the performance and quality of flat plate collectors: 1) research and develop selective coatings suitable for flat plate solar collectors. The coatings should have high absorption, low infrared emissivity and excellent

The collector with high efficiency is composed of collection and absorption devices. Sunlight consists of visible light and invisible light of different wavelengths. Different substances and colors have different absorption and reflection capacities for light of different wavelengths. Black has the strongest ability to absorb sunlight, so cotton padded clothes are generally used