vacuum tube solar water heater 真空管太阳能热水器
Thermal efficiency is an important parameter for the design of vacuum tube solar heater.
设计 真空管太阳能热水器时的重要参数。
The result showed that it was an efficient and proper method which can serve as a new assistant means for the design of vacuum tube solar heater.
结果表明，该方法速度快，结果较准确，为真空管太阳能热水器的设计提供了一个新的辅助手段。
In the case of constant pipe diameter, lengthening the length of vacuum tube is an effective way to increase the total heat of solar water heater!
在管径恒定的情况下，加长真空管的长度是增加太阳能热水器总得热量的有效途径和方向！
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