Solar cloudy day, whether in winter

   After the first generation of solar heaters, drying stuffy style, second-generation flat, the third generation of vacuum tube type of development, the common presence of defects is cloudy and winter use of the rigorous test. Solar water heater for two generations before the complete lack of insulation performance, cloudy and freezing regions can not be eliminated using, instead of widely used in today's market, solar water heater vacuum tube.

   Vacuum tube solar water heater solar water heater to overcome the shortcomings of the previous two generations and the use of a selective coating to control thermal emission rate, has some insulation properties, but the vacuum tube in a continuous cold weather conditions is also easy to the cracking ice, and each one to use two tubes must be cleaned to remove scale, or thermal efficiency will be declining at the same time, vacuum dirt on the water quality contamination may seriously harm people's health.