<p>The system has tubular channels extending into walls, and temperature control tubes (1) in which fluid i.e. water, is passed. The tubes are inserted into the tubular channels. The temperature control tubes include an outer tube (10) whose one end is closed and another end is connected with an inlet (2) and an outlet (3). An inner tube (11) is arranged in a coaxial manner and connected with the inlet and the outlet in proximity to one of the ends of the outer tube. The inner tube extends upto the other end of the outer tube, where an opening is provided at the latter end of the outer tube.</p>
