There will always be unforeseen hydronic system problems popping up when conducting on-site commissioning. To avoid these surprises, Dr Jean-Christophe Carette highlights the importance of practical training for hydronic systems.
“In theory, there is no difference between theory and practice; in practice, there is.” This statement attributed to the late computer scientist Jan van de Snepscheut is certainly applicable to hydronic systems where on-site commissioning often brings surprises.
These can range from clogged strainers to damaged pipes or pipes that aren’t connected correctly, to shut-off valves that are partially shut or check valves installed back to front – the list goes on.
The presence of test-points on balancing devices combined with the use of modern balancing and measuring instruments is crucial in commissioning a system for energy efficient operation.
With measuring capabilities, we are able to get quick measurement of vital parameters.
Over the years, we have seen a general trend toward the integration of multiple functions into one valve body. Unfortunately, this type of valve is often applied blindly, disregarding the unique and particular hydronic structure of each plant.
While this is usually presented as an effective “fit and forget” approach, it often ends up being a “fit and regret” result.
This is because if it isn’t properly measured and commissioned, the self-acting differential pressure control part of this type of valve actually hides the reality of the circuit.
This is how a technology that can deliver great energy savings ends up increasing energy consumption.
Obtaining an energy efficient hydronic distribution actually requires the implementation of a systematic methodology.
The first step is to analyse the schematic drawing of the piping and the extraction of its skeleton.
The back-bone of this skeleton is then determined and the entire pipe network is decomposed into hydronic modules that can be treated one by one with testing and adjustment methods that are designed to obtain the lowest possible pump head for circulating required flows in each terminal unit.
Implementing this methodology step by step is something that everybody should experience at least once because the end result is energy savings of up to 40 per cent.
The choice of investing in variable speed pumping is all about obtaining a reduction in energy consumption.
Methodologies can certainly be taught through well-prepared presentations, but nothing beats practical experience and the opportunity to circumvent unexpected problems.
It is always good to get your hands dirty. As Confucius said: “I hear and I forget. I see and I remember. I do and I understand.”
We believe the best way to learn is by doing. Our training centres are equipped with realistic models of hydronic circuits incorporating variable speed pumps and valves of different types in the fields of pressurisation and water quality, balancing and control and thermostatic control.
I can only encourage people interested in seeing and learning to visit these training centres in order to get practice in a safe environment before applying procedures on-site.
About the author
Dr Jean-Christophe Carette is Hydronic College director at TA Hydronics in Switzerland and can be contacted by email at jc.carette@tahcollege.com