MONITORING HVAC SYSTEMS
MCKENZIE HOUSE
Metering and monitoring enabled McKenzie House at Cardiff University to make substantial energy savings with little capital expenditure.
systems running in unoccupied areas and bad sequencing where, for example, three chillers might be running simultaneously when only one is required. iSERVcmb addresses all the technical components in the EPBD such as boilers. pumps, fans and chillers. By collecting data from hundreds of HVAC systems, iSERVcmb will be able to provide benchmarks at the components level when serving specifi ed end-user activity, hours of use and areas such as a conference room, kitchen, or server room. These benchmarks will allow energy managers to assess whether the energy being consumed by their HVAC system is reasonable for the activity it serves. Benchmarks will be continually updated during the project. The researchers will use the project fi ndings to create professional guidance on in-use energy
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consumption of HVAC systems. This will, in turn, provide guidance for European member states legislating for automatic monitoring. ‘We are attempting to show from live systems the benefi ts that can be achieved, as well as the practical in-use limits on reducing energy use when servicing specifi c end-user activities.’ says Knight. ‘iSERVcmb provides evidence-based data to inform the regulations that will be used to try and achieve near zero carbon buildings from 2019.’
How it works For end users adding HVAC information to iSERVcmb there are two main sections to address. The fi rst section requires them to describe the physical assets of the HVAC system, the spaces and activities served, the meters used to record the energy consumed,
January 2013 CIBSE Journal 61
The data revealed that the HVAC systems were being run for far longer than necessary. The controls were changed so that they were only operating when areas were occupied. Further energy savings were made when the comfort range was extended from 20-26oC to 21-23oC, and AHUs were turned off before people were due to leave the offi ce. In total the electricity savings achieved in this building from the HVAC system amount to around £55,000 per annum and are part of a total 33% (£74,000) annual electricity saving that has been achieved since 2005.
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