What kind of solar water heater
The utility model relates to a solar water heater, which is a device for converting solar energy into heat energy, which is used for heating water from low temperature to high temperature, so as to meet the requirement of hot water use in people's life and production. According to the structure of the solar water heater is divided into vacuum tube solar water heater and flat type solar water heater, mainly vacuum tube solar water heater, occupy 95% of the domestic market share. Vacuum tube type solar water heater is composed of a heat collecting pipe, a water storage tank and bracket and other related parts, converting solar energy into heat energy mainly rely on vacuum tube, vacuum tube using the principle of cold water sinking floating, the water circulation and desired hot water.
PPR pipeline expansion coefficient is large, about 0.15mm/m degrees, which means the external temperature (such as summer and winter) or internal temperature (hot and cold) changes, a large deformation, because the PPR pipe is a rigid pipe, itself can not digest the deformation, so it is easy to cause deformation even Water Leakage pipeline system and plastic bending because of the aluminum composite pipe into a whole, the linear expansion coefficient with aluminum is about 0.025mm/m / C, PPR tube 1/6, the change of temperature, the deformation is smaller, and the plastic pipe is a flexible coil pipe itself can absorb a certain amount of deformation, will not cause the thermal expansion deformation of pipeline system.
PPR tube low temperature tolerance. PPR has a cold brittleness (brittle point of -20 degrees C), in winter (5 degrees Celsius) when the construction of special care. Aluminum plastic pipe without cold brittleness (brittle point is -70 DEG C), can be easily installed below -20 C. Heat resistance of PPR pipe is lower than that of aluminum tube. PPR long-term use temperature of 70 degrees C (50 years, 1MPa), the maximum use temperature of 95 degrees C; long term use of aluminum plastic pipe temperature of 95 degrees C (, 1MPa), the maximum use temperature of 110 degrees C.
I think that if you are on the vacuum tube hot water without high requirements are similar, many manufacturers in the flicker concept, is really not Huangbao solar bluff truth.
