The QSEC method

QSEC’s energy efficiency work is based on our own developed method – the QSEC method. What is the difference between the QSEC method and traditional adjustment techniques?

With traditional adjustment the flow inside the system is adjusted by restrictors at several points. This is done with control valves, radiator valves and sometimes also with return valves. These restrictors are easy to manipulate, by increasing the flow locally, for instance. As water always takes the simplest route, the other parts of the system will suffer in consequence.

Instead of this adjustment method, you can also distribute flow by restricting it at the heaters, e.g. radiators and underfloor coils. In this case, however, the pressure drop happens at the heater. These restrictors thereby receive authority over other resistance points, thereby providing a more exact adjustment. This restrictor is mounted in the piping system – in the radiator, for example, as a brass component with a carefully calculated KV value (the QSEC valve).

All the other restricting devices in the system are left fully open.
It is now much harder to manipulate the system and simpler to localise any future problems.

As part of the QSEC method, we check the whole system’s function during the winter half-year, by measuring the water temperature and the temperature decrease in all the heaters to ensure that the right flow is achieved.