Types of hydronic balancing: Static hydronic balancing

Tuesday, July 19, 2022
Hydronic Balancing

How does static hydronic balancing work?

With static hydronic balancing, the mass flows are regulated manually, via pressure-dependent valves. Here, the mass flows are calculated and set exclusively for full load cases – efficiency-optimized heating water distribution is therefore only aimed at for the maximum utilization of the heating system. This means that the partial load case or varying load ratios cannot be mapped with this solution – which is why it is known as static balancing.

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In what types of housing would static hydronic balancing fit?

If the room-by-room heating load is included in the calculation, static balancing offers the best cost-benefit ratio among balancing solutions for detached and semi-detached houses or multi-family houses with small residential units. This is because the pressure-dependent thermostatic or balancing valves required for its implementation are already present in most existing systems or can be retrofitted at low cost if necessary. Even with underfloor heating systems, static balancing is completely sufficient for smaller residential units, as dynamic balancing only offers insignificant advantages due to the inertia of the system. Static pre-balancing in combination with adaptive heating optimization based on room temperature achieves the best results here.

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What are the disadvantages of static hydronic balancing?

Since the mass flows are only optimally balanced in full load cases, flow noises often occur in partial load cases, which are caused by increased flow speeds in the thermostatic valves. It is also important to remember that the full load case only occurs a few days a year and the heating system is therefore not optimally balanced for the rest of the year. Nevertheless, carrying out simple static balancing is more beneficial in terms of energy than completely omitting hydronic balancing. Our tip: The combination of "static balancing" with a high-efficiency pump with the lowest possible and constant delivery head provides a solid basis for almost any smaller residential unit.

Which components are suitable for implementation of static hydronic balancing?

Suitable components for static hydronic balancing are thermostatic valves type RA-N or RA-UN or built-in valves; combined with mechanical radiator thermostats RA2000. And manifolds and controls for hydronic floor heating Icon™, and balancing valves Danfoss series of Leno™ or MSV-F2.

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Read more about other types of hydronic balancing