1. A heating / cooling element (further: heating element) of elongated shape, mounted
along a rail such that there is contact across a large surface between the surface
of the heating element and the surface of one or more of the rail web, the top of
the rail toe and the lower side of the rail head and through which heating element
one or more separated liquid channels extend longitudinally to extend parallel to
the rail, and with, related to the operating attitude in which the heating element
is mounted against the rail, at least one of the following:
- the liquid channels are located diagonally and the liquid channels are separated
by a diagonal partition wall(3) that remote from the top and lower side of the heating
element, approximately halfway its height, extends and inside the heating element
connects to the front and back wall, and which wall (3) makes an angle with the horizontal
and vertical, viewed from the rail extending inclined upward, and there above a liquid
channel and there below a liquid channel are present;
- in side view two or more liquid channels overlap at least partly, wherein in the
overlapping part the top liquid channel is closer to the rail head and rail web of
the rail;
- each liquid channel (4, 5) is provided, viewed in the section perpendicular to the
flow direction of the liquid through the liquid channel (the cross section), by a
central part of simple, e.g. round or square, shape and one or more from the central
part extending branches of e.g. substantially triangular or rectangular shape, possibly
widening in the direction away from the central part;
- the flow through section of the liquid channels is substantially equal;
- all liquid channels have a substantially symmetrical shape in cross section;
- the one liquid channel is connected to a liquid supply and the other liquid channel
is connected to a liquid exhaust.