HVAC designer makes dimensioning plumbing components simple. Below are a few examples of some situations where the tool can be used.

#### Selection of circulation pump

A three-storey building must have a new circulation pump for its heating system. The heating system consists of 15 radiators with a heating power of 1 kW each. The radiator is dimensioned for a temperature difference of 20 degrees between supply and return. There are 80 meter heating pipes (incl. Forward / return), which are dimensioned for a maximum of 100 pa / m. The pipe system also has radiator valves (10 kpa) and a static balancing valve (5 kPa). The total test table in the system is thus 80 m x 0.1 kPa / m + 10 kPa + 5 kPa = 23 kPa, corresponding to a desired ceiling height of 2.3 mVs. On HVAC-designated, the power is now set to 15 kW and the temperature difference to 20 Degrees. Hereby it is seen that the heating system must run with a flow of approx. 645 l / h. The graph shows that a MAGNA3 25-40 or Alpha3 25-40 from Grundfos will be optimal in the heating system. Selection of pipes and valves It is desired to find a suitable pipe diameter for steel pipes in a heating system with a test table of max. 100 Pa / m. The system’s flow is known to be 1 m3 / h, which according to the conversion table corresponds to 1000 l / h. 35 mm, or a DN40 with an inside diameter of approx. 41.9 mm. You can now click on the displayed products to read more. In the same way, compatible valves are read.

#### Valg af rør og ventiler

It is desired to find a suitable pipe diameter for steel pipes in a heating system with a pressure drop of max. 100 Pa / m. The flow of the system is known to be 1 m3/h, which, according to the conversion table, corresponds to 1000 l / h. Based on this flow, two diameters can now be read – DN32 with an inside diameter of approx. 35 mm, or a DN40 with an inside diameter of approx. 41.9 mm. You can now click on the displayed products to read more. Compatible valves are read in the same way.