Answers to questions asked at Tuesday's webinar
How do boiler optimisation controls compliment existing Building Energy Management Systems? And why can't BEMS provide the same functionality?
Most BMS/BEMS systems measure a common flow and, or return header temperature from the boilers. From these temperatures the BMS strategy/control will make a control function based on the blended / diluted water temperature from all the boilers connected to this pipe work header. Discreet Boiler optimisation controls (such as M2G) measures the individual boiler load response and profile, directly from the boiler flow / return connections, to identify "dry cycling" of that specific boiler.
Why aren't boiler manufacturers using this technology?
Boiler manufacturers do not normally specify the type of burner to be used and offer a boiler for many different applications. Due to all the variables the boiler manufacturers tend to offer a flexible product. At the design stage the boiler manufacturers assume that the boiler has been correctly specified/sized for the required building load, this is rarely the case. Also from a commercial point of view the manufactures will not offer enhanced controls as standard.
Are they easy to install - what maintenance is required?
Our M2G boiler control is installed normally within 2 hours per boiler, this is a completely non intrusive process and does not involve boiler shut downs or loss of services.
Do boiler optimisation controls have a track record?
M2G has a track record. This has been independently verified and validated by notified bodies within our industry. The M2G has also been subject to rigorous trials and pilots by some of the UK’s leading private and public sector organisations. The M2G is also approved by CE and UL for American Safety Standards, and has recently been approved for London’s Green 500.
What about allowing for future expansion of the building, when determining boiler/plant size?
If during the design stage of the boiler plant, it is required to allow for future expansion of the building (boiler demand). The boilers that are not needed at that time, should be isolated both electrically and hydraulically. It should be noted that correctly sized boilers, will still be subject to "dry cycling". This will be caused by controls such as weather compensations or reduced load conditions.
What about multiple boiler installations? A second/standby boiler will still have all the standing losses.
It would be normal to sequence multiple boiler applications to avoid standby boilers being subject to standing losses. However, unless the sequencing control isolates the standby boiler hydraulically with the use of motorised valves, the problem will still occur. In this case the M2G will remove wasteful firing sequences during these standing losses conditions.
Why do you have to purge a pressure jet boiler?
Pressure jet burners normally "purge" the combustion chamber of the boiler with ambient air before re-firing, to ensure that the boiler does not have un-burnt gases left from the previous firing operation. During this purge sequence, any residual gases are diluted/removed into the atmosphere via the flue system. This is a safety standard under EN298, however, if the boiler is operating very cyclically i.e. "dry cycling", the excessive purging will cool the boiler down wasting further fuel.
How do you measure your savings? These big organisations are known to have several energy efficiency in place, how do you identify your specific technology from all the others.
We have developed a measurement methodology to ensure that all the variables are taken into account, such as degree data normalisation etc. During the measurement process we are only measuring boiler gas/oil/LPG usage directly for heating and hot water generation. This enables us to then calculate the energy consumption and CO2 savings directly attributed to the boilers being optimised. The M2G has a unique and patented technology that has a clear advantage over other vaguely similar products.
Do Tony Willis's claims to carbon savings relate to the entire building, or just those associated with heating?
The carbon savings only relate to boilers serving heating and hot water generation.
Perhaps we should be specifying Boiler Optimisation controls at design stage as well.In order to mitigate these issues with inefficiently running boilers.
We agree, M2G technology should be considered as the "Industry Standard" to overcome these inherent inefficiencies found in boiler plant.