Solar evacuated tube or vacuum tube collector comprises a number of rows of parallel transparent glass tubes connected to the header pipe and where the heat transfer fluid (generally 50% Propylene Glycol) circulates and absorbs heat generated by the tubes. 

The glass tubes have a cylindrical shapes. You should always choose the collectors that provide the optimal combination of thermal performance, quality, and cost. That’s why solar evacuated tube collectors are superior to flat plate

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Evacuated tube collectors or solar thermal flat plate? This is a very common question in the solar thermal industry. Eccentrically enough, several people weigh-in, and take different sides. As a Red Sox vs Yankees kind of rivalry, it is an intense debate. In the end, it relies on the job you are working on – the roof, the climate, your budget, and the kind of systems you are using all need to be considered to make the solar evacuated tubes vs. flat plate decision. 

There’re many design

The solar collector acts as an engine of any solar water heater. A solar vacuum tube is the most efficient solar power production system; but was more costly than flat panel system. With the immense popularity of solar energy and modern manufacturing techniques, the solar vacuum tubes cost less while ensuring the greatest return on the investment.

Working principle of SunRain solar vacuum tube collector

The working principle of solar vacuum tube is simple. It works same like a coffee thermos. A