Floor PEX radiant heating system Uponor Wirsbo, as well as any other PEX radiant heating system must be hydraulically balanced. To do this, make a preliminary adjustment of valves on the return manifold.
Example of selection of initial parameters for the reverse distributor
Data:
Full flow: Q = 0,3 l / sec., The length of the loop = 70 m; coolant flow in the longest loop = 0,5 l / sec.
Calculations:
We find in the chart, the pressure loss for the longest loop = 0.065 kPa / m, the total loss for the loop; 0,065 x 70 = 4.5 kPa.
For flow 0,05 l / sec. with the full opening (position 5) the loss of pressure on the distributor to find the schedule, it = 2,2 kPa. Total loss for this loop is 4.5 + 2.2 = 6.7 kPa.
For the next loop with a flow 0,04 l / sec. according to the nomogram we find the loss of 0,044 kPa / m, for a loop length of 55 full loss of 2.4 kPa.
For this loop should compare the following values of pressure 6,7 “2,4 = 4,3 kPa, this value and flow 0,04 l / sec. obtain the value of the position for this loop, 3,0 (the number of revolute rotation of the position of a closed valve).