balance

Chapter 2. All you need to know about hydronic balance

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All you need to know about creating hydronic  balance in two pipe heating systems.

Let's have a look at how heating systems work .

Unbalanced systems cause noise and thermal discomfort due to under and overheating 

which in turn leads to higher energy consumption.  

To improve this it is very important to understand the dynamics of the heating system and how imbalances occur. 

To simplify the water flow in an unbalanced  heating system can be compared to how water  

is distributed from a water hose. Ideally all flows should be similar to the design flow.

However this will not happen in unbalanced systems. In such systems radiators close to the pump will have  

pressures that are too high and in turn have  too high flows through the radiators.

Radiators further away from the pump will experience the opposite, resulting in too low flows through these radiators

Too high flows often cause noise and are an indication of inefficient use of energy.

Too low flows create complaints  about lack of heat and comfort. 

In an attempt to solve the issues, often the water temperature is increased or a larger pump with a higher pump head  

capacity is installed, such attempts increase  further overheating especially by radiators  

closer to the pump, resulting in significantly  higher energy consumption. 

This is not a valid solution.

Another attempt to gain control of the  problems is to install manual balancing valves.  

These will ensure correct water flow through the radiators no matter how close to or far away from the pump they are.

However outdoor temperatures  and indoor heating demands change constantly  

causing residents to open or close their radiator valves.   

To cope with this load change thermostatic radiator valves are installed, this turns the heating system into variable flow system.