| 摘要 |
PROBLEM TO BE SOLVED: To improve facility efficiency by improving circuit power factor in a fluid heating apparatus, wherein electrical heating is performed by applying three-phase AC voltage to a conductor pipe through which fluid flows internally.SOLUTION: A fluid heating apparatus is equipped with a conductor pipe layer composed of 3N layers, which is configured by winding a conductor pipe 2 in a helical manner. The conductor pipe is disposed concentrically so that the impedance value of each conductor pipe layer may be almost the same, and so that the winding direction may be the same. Out of the adjacent conductor pipe layers, one end of one conductor pipe layer is wound as a winding start position and the other end is wound as an winding end position, while the other end of the other pipe layer is wound as a winding start position and one end is wound as an winding end position. One phase of the three-phase AC power source is connected with the winding start position of an n-th conductor pipe layer (n=1, 2, ..., (3N-1)) and the winding end position of an (n+1)-th conductor pipe layer. Meanwhile, one phase of the three-phase AC power source is connected with the winding end position of the first conductor pipe layer and the winding start position of the 3N-th conductor pipe layer. |
