Knowledge to explain the purchase of articles
August 2010, AQSIQ for the products, sampling, and the results released to the outside world, by understanding the state of the sampling process and content, through a summary of the industry and research, advised consumers to follow the steps below selection, will be able to buy desirable products.
For a long time, solar water heater industry with low barriers to entry, fake and shoddy products flooded. Emerged in the market in our province hundreds of large and small brands of solar water heaters, dazzling, impossible to distinguish good and bad. August 2010, AQSIQ for the solar water heater products, sampling, and the results released to the outside world, by understanding the state of the sampling process and content, through a summary of the industry and research, advised consumers to follow the steps below selection, will be able to buy desirable products.
First look at the product quality and technical specifications:
First, the thermal performance, the \"average daily efficiency,\" the higher the better, \"the average heat loss coefficient\" lower the better.
Second, detailed observation of the coating on the glass vacuum tube, which is called the solar selective absorbing coating layer coating, good quality coating color uniformity, film no scratches, no peeling or shedding phenomenon, there is no glass stones or nodules phenomenon, supporting the support of glass pieces placed upright, not loose.
Third, pay attention to vacuum spacing between the tubes, usually two in the center distance of 80mm or so.
Fourth, pay attention to whether the product is designed to take full advantage of the absorber tube, vacuum tube can maximize the sunlight.
Fifth, in general, and no sun in the winter weather, you need to use with the electric heating device, it also should be chosen with the design of electrical safety products.
Sixth, check the water tank insulation thickness. Flat insulation thickness should be ≥ 50mm, overall polyurethane foam insulation to the best. Polyurethane foam is yellow, a bit like a sponge, foams have a more uniform pore, squeezing his hand with a certain flexibility, but the insulation is too soft on its density is smaller, is not conducive to heat.
Seven, stent design should be reasonable and should have sufficient strength and rigidity to ensure an adequate load-bearing capacity. Many solar water heater due to wind resistance design and product quality, there are some problems, resulting in blown, fallen aircraft, vacuum crushing and other more serious losses.
Finally, look at their family\\ s needs:
A home should also be considered when choosing the number of resident population in order to ascertain the purchase of domestic solar water heater water capacity size. 40 liters of water per person is generally the standard is appropriate. In addition, the purchase should ask vendors, their nominal water capacity refers to the total water capacity or the actual volume of water can be used, the difference between the two.
Second, pay attention to the winter easy to use as the standard, see the winter can provide enough hot water in winter, water tank insulation effectiveness, rather than price. Therefore, consumers in the choice of solar water heater, do not let dealers led by the nose, must be easy to use as the standard in the winter, all year round, easy to use product selection.
Based on the above factors, see and hear more more more more to ask, you will be able to choose a good product for your home.