It's a long story. Solar water heaters took shape as early as the 1970s. The simple idea comes from the fact that black objects absorb solar energy and become hot. Early products include solar drying solar water heaters and flat panel solar panels. However, due to thermal insulation and the issue of thermal efficiency, the issue of thermal efficiency has not been popularized in China. In 1991, after breakthroughs in film layer preparation, vacuum acquisition and related processes, vacuum tube solar water heaters developed rapidly in China. and become a mainstream national product. So far they are irreplaceable.
When did solar water heaters arrive in China?
Introduction It's a long story to tell when solar water heaters arrived in China as early as the 1970s. The simple idea comes from the fact that black objects absorb solar energy and become hot.