1. The specific design of all solar collectors Baoshan wall-mounted water heater at the beginning, you first need to carry out the work in accordance with its specific purpose and design environment Selection 1. No transparent cover design, its low operating temperature, the working fluid flow, can take advantage of flat-plate collector collector efficiency, high efficiency and low cost advantages, suitable for outdoor heated swimming pool and other water sources. 2. single transparent cover, plain black gas coating design, this collector designed for southern China, high ambient temperatures, use in the spring, summer and autumn, the production life of 40-500 ℃ low temperature thermal water. 3. single transparent cover, selection absorbing coating design that can be used throughout the year in southern China, the production of 60-70 ℃ higher temperature domestic hot water, with good thermal properties. 4. single transparent cover, selective absorbing coating, double loop collector design, this collector designed for cold regions, and throughout the year, as is the two-cycle collector, poor thermal efficiency, high cost 5. Wall-mounted solar water heaters double Baoshan transparent cover, selective or non-selective absorbing coating design, which produces a higher temperature hot water, due to the double-transparent cover system structure is complicated, and the inner layer Glass is often uneven force due to thermal expansion and rupture, the optical efficiency is low, so there has been little adoption. Flat-plate collector of nausea drying temperatures up to 150-200 ℃. So the choice of insulation material to be thermal conductivity, heat working temperature must be higher than the stuffy drying temperature, a significant deterioration of the thermal deformation and thermal insulation does not occur. Baoshan solar wall heaters