The heating element is integrated with a helically coiledtube and cast-in aluminum for maximum efficiency.
加热部件有螺旋盘管和镶铸铝，提供了最大的高效性。
2
The manufacturing technology of coiledtube in foreign utility boiler works was introduced, and its comparison with domestic manufacturing technology was carried out.
介绍国外几家电站锅炉制造厂蛇形管制造工艺，并同国内的制造工艺进行简要比较。
3
The utility model discloses a steam-free alcohol distillation tower which comprises a tower body and a heating device; the heating device is in annular coiledtube structure;