Anhui Provincial Bureau of Quality Supervision Organization in Q2 2010 were the products of provincial supervision and spot checks . The sampling in Hefei , Chuzhou , Wuhu and Bengbu samples were taken 30 set by the test , 28 group of qualified , product sampling rate of 93% qualified .
Product quality problems mainly in thermal performance of domestic solar hot water system , water capacity and other indicators . First, some products do not meet standards of thermal performance of the project requirements . Thermal performance is a measure of household solar hot water system solar radiation into heat capacity of technical indicators. Daily useful energy (single day) is in a certain amount of solar irradiance (8h, = 17MJ/m2) , the storage temperature of not lower than the hot box of the specified value (45 ?) , the unit size storage hot water contour lighting The heat gain inside the water . Day may lead to a useful heat ( one day) / average daily efficiency of product failure is due to unreasonable design , lighting contour area is large, small water capacity , causing water capacity and the ratio of light area is too small ; product design one-sided pursuit of temperature L , the volume ratio of water and lighting design area too small ; a small number of vacuum tubes , increases the tube between two adjacent space .
Second, some products with the nominal water capacity not match . Provisions of the national standard should be the nominal water capacity of water actually available for the user capacity . The spot checks in some products marked deviation of the largest water capacity to -22.9 %, exceeding the standard deviation of ± 5% ( the export open type ) of nearly 4.6 times .
Ligting again is an area of some products does not match with the nominal . National standards set forth in nominal size and actual contour lighting area lighting deviations = 3%. The checks in the area , some products labeled lighting up the largest deviation -29.9 %, exceeding the standard deviation of nearly 10 times.
The monitoring found that tagging Solar Technology Co., Ltd. Anhui Province and Anhui to the production of labeled standard model "f58-15/18", label production date / batch number as " 2010.04 "and "Wan to "solar water heater , solar energy label to believe in Chuzhou Water Heater Co., Ltd. produced marked specification model " 420-15-18 " , mark the production date / batch number as " 2010.03 "and" to believe in "solar water heaters, thermal performance , appearance, hot water storage tank project failed .
For the problems , quality supervision departments of technical experts recommended that companies control hot water storage tank capacity from the water and lighting area ratio ; to improve the quality of vacuum the level of control of the vacuum tube collector and vacuum coating ; using high-quality thermal insulation materials; Hot water storage tank to improve the manufacturing process , using materials and anti-corrosion coating technology and other aspects of quality improvement and ensuring the quality of raw materials .

Author: Best Solar Energy Technology Co., Ltd., Zhejiang 1
website: www.ejaisolar.com
main product:  solar water heater?solar collector