． The working principle of vacuum tube solar water heater: vacuum tube heat absorption-microcirculation-insulation water tank-measurement control system-user.
The vacuum tube solar water heater uses vacuum tubes to collect heat to maximize the conversion of light and heat. It transfers the hot water to the insulated water tank through microcirculation and then to the user through dedicated pipelines. The control system sends tap water to the solar energy through control valves, controllers, etc. to achieve automated control. The auxiliary electric heating is placed in the water tank and is ready for use in cloudy, rainy and snowy days, saving 90% of electricity. and run automatically. Performance characteristics and technical parameters
⑴Heat collecting element-vacuum tube technical parameters and specifications: 1200mm×47mm 1500 mm×47mm.
At present, the best heat collecting effect is AL---N/AL vacuum sputtering selective coating. This product uses 1.2, 1.5m glass vacuum tubes using this coating, and its absorption rate is ≥0.93 Infrared emissivity ε≤0.6, average heat loss Uct0.9W/㎡℃, vacuum degree P≤5×10ˉ3pa, made of high borosilicate 3.3 extra hard glass with performance equivalent to the United States.
⑵. Performance characteristics and technical parameters of thermal insulation materials:
The quality of thermal insulation materials is directly related to thermal efficiency and use at night and early morning, which is especially important in the cold Northeast. At present, the better thermal insulation method is imported polyurethane thermal insulation. If the ingredients, process, environment, and temperature are not suitable, it will also cause uneven foaming or excessively large cells, slow leakage of working fluid, and gradual decline in thermal insulation properties. This requires The manufacturer has specialized foaming machinery, standardized molds and a high level of process technology. In addition, we not only need to understand the material technology of the product, but also look at the manufacturer's organic costs such as machinery and equipment, molds, and the level of quality monitoring. Product quality is directly related to consumers' interests.
Polyurethane insulation layer thickness: 70mm Closed cell ratio: 65.69% Thermal conductivity: 19.83mw/m.k, and has been cured at high temperature.
⑶Water tank liner and bracket
The water tank is an important part for storing hot water. The strength and corrosion resistance of its materials are crucial. The high-quality material should be imported SUS304 plate , stainless steel plate with thickness between 0.6mm--0.8mm, argon gas protection, high-frequency automatic welding, which improves the corrosion resistance of the steel plate in various water qualities or various environments. It is a relatively advanced welding process and bracket materials are all used. Made of stainless steel (SUS304), it has beautiful appearance, high strength, and is connected with bolts throughout. The bracket and the whole machine have strong rigidity, are convenient for transportation and installation, and have strong corrosion resistance. B． The working principle of the heat pipe pressure-bearing solar water heater: vacuum tube absorbs heat - heat pipe conducts heat - insulated water tank - control system - user. (Higher price) Heat pipe pressure-bearing solar water heaters use vacuum tubes to collect heat and have built-in ¤-shaped fins to transfer heat in high-temperature environments to heat pipes. The heat pipes quickly transfer heat into the water tank, especially in cloudy conditions with low radiation intensity. Down, start heat transfer quickly. After continuous testing, the daily average thermal efficiency of heat pipe solar water heaters is as high as 56%.
Heat transfer element-heat pipe technical parameters and specifications: φ8×1520
⑴. There are many domestic heat pipe manufacturers. We test all domestic heat pipes and conduct experimental tests on heat pipe performance and heat pipe life in accordance with GB/T14812-1993 and GB/14813---1993. Most organic heat pipes lose heat transfer after one or two years. The efficiency dropped significantly, and finally the inorganic molecular heat pipe (patented technology by MACBLE Company of the United States) was selected. It passed long-term system testing by the Stanford Research Institute (SRI) in the United States and proved that it has excellent heat transfer performance. Heat transfer does not require phase change of the working fluid, but relies on molecular thermal motion, which results in fast heat transfer and high heat transfer efficiency. ⑵. High pressure-bearing capacity
The heat pipe solar water heater water tank is made of 2MM thick steel plate, arc-shaped head, CO2 automatic welding, pressure-bearing capacity 0.6MPa, and sealing working pressure up to 1.2Mpa. The international advanced chemical nickel plating technology is selected, and the surface spraying reaches the international advanced level. The collector can withstand the pressure of tap water (test pressure up to 1.2MPa). The size complies with the regulations of TB311-74, ⑶. Anti-freeze and strong load-bearing capacity
The heat pipe solar water heater adopts heat pipe heat transfer technology. There is no water in the collector tube, and the collector tube will not be frozen due to low temperatures in alpine areas, thus affecting its use.
And because there is no water in the pipe, if one heat pipe is damaged, it will not affect the operation of the whole machine, so the water heater can be used in a wider range. The bracket material is all made of stainless steel (SUS304), with beautiful appearance, high strength, and the whole body is connected by bolts. The bracket and the whole machine are highly rigid, easy to transport and install, and have strong corrosion resistance.
Reference: China New Energy Network