all-glass evacuated collector tube
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The vacuum degree between the inner and cover glass tubes plays a very important role in heat loss and the life time of all-glass evacuated collector tube.
全玻璃真空太阳集热管内外玻璃管夹层间真空度的保持情况对有效降低热损、提高太阳能的利用率、延长集热管的寿命都有至关重要的作用。
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