How much solar vacuum tube
Three look at the distance between tubes. General two tube center distance of about 70 mm is appropriate.Four see water heater liner. At present, there are two kinds of solar water heaters in the market. According to the process of stainless steel lining and mouth. According to the thickness of the material and thin, thick stainless steel. According to stainless steel grades and sas304, sas403, etc.. There is no guarantee of the quality of the process. Welded thick stainless steel (70.5 mm) welding mouth after welding has undergone changes in the internal structure, corrosion, life is difficult to guarantee, the general life of about 5 years. The welded stainless steel has a shorter life and is easy to draw. Enamel liner is divided into ordinary enamel, high-grade enamel, titanium gold Blaupunkt enamel liner, the general use of the enamel lining is the use of ordinary enamel enamel enamel appliances, life expectancy of about two years. Advanced enamel liner with chemical enamel evolved from the ordinary enamel is much better, the general life of about 5 years. Titanium gold Blaupunkt enamel lining imported enamel, acid resistance to reach AAA level, close to the level of more than I, more than European standards, life of more than 15 years.
Several key points to buy solar water heater:Thermal performance index. The higher the average daily efficiency is, the lower the average heat loss coefficient is.Two see vacuum tube quality. The key component of the solar water heater is the vacuum tube, the quality of the vacuum tube directly affects the performance of the product. Purchase should be carefully observed in the vacuum tube glass coating on the tube, the coating layer is called solar selective absorbing coating, because the factory production process, color coating will be different, but generally are black, dark blue or dark gray. Good quality coating color uniform, no scratch film, no peeling or shedding phenomenon, there is no stone or nodular phenomenon on the glass, supporting the support of the glass tube placed upright, not loose.
Generally look at the smoothness and weight, about seventy or eighty a,Some of the top brands in the solar energy are very good. Huang Ming's brand sells a little fire. But the price is relatively high.In fact, there is no need to buy the most expensive, pay attention to practicality and cost-effective
Five see water heater structure. The utility model relates to a water heater structure. Currently on the market there are two kinds, one kind is sealed by the silicon rubber ring, and the other is the metal seal of the copper sleeve structure. Silica gel ring seal of the solar water heater maintenance is not convenient, easy to leak, once the leakage, the whole solar water heater will be paralyzed can not be used. Copper sleeve sealed solar water heater because of the use of double wall heat pipe vacuum tube, the whole machine can withstand pressure, high temperature resistance, metal copper sleeve is not easy to aging, use and maintenance are very convenient.Six see the reliability of auxiliary heating, including life and safety in two areas. Electric heating does bring convenience to consumers, can ensure that every day to bath, but the choice is not good, but also to the user's life safety risks. Safety depends on the quality of electric heating elements and whether or not to ensure that the two factors. The previous factors require manufacturers to guarantee the quality, after a factor and structure are closely related, not to burn the electric heating element must ensure long-term immersion in water. This requires that the structure of the water heater is a copper sleeve structure, and the heat collecting tube is a heat pipe vacuum tube.
