NEWS
Key role for MVHR in new homes
Mechanical ventilation with heat recovery (MVHR) will play an increasing role in new homes, according to research. A report written by the Zero
Carbon Hub’s VIAQ (Ventilation and Indoor Air Quality) Task Group highlighted the need for better air quality in homes that are now built to ‘tighter’ standards with reduced air leakage and improved insulation. The group said heat recovery
also provides a clear benefi t in such dwellings as they have a relatively low heating demand. However, the researchers said
there was a need for a better evidence base to support the case for MVHR and ‘a more robust approach’ to the design and installation of the
systems to improve quality. They also highlighted the importance of controlling sources of indoor pollutants – whatever the ventilation system. ‘With mechanical ventilation
systems presently representing nearly 50% of overall new-build ventilation solutions, and the market set to dramatically increase over the next year or so, now is the time to focus on quality,’ said Kelly Butler, marketing director of the British Electrotechnical and Allied Manufacturers Association (BEAMA), who contributed to the report.
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Flexibility
Intelligence Performance Efficiency
Delivering Performance for Buildings! “EC-NetAX provides the power to do more, with cost-effective
and scalable integration of all my customers’ control, monitoring, and operational needs. More than a building management system for HVAC, Lighting, Sunblind, Access Control, CCTV and Energy Management, EC-NetAX
provides all the tools my customers need to gain intelligence into their buildings’ performance.” on carbon-cutting target
the experience of Robust Details with inspections on party walls and fl oors showed that there were variations from specifi cation in over 20% of inspected dwellings. Whilst this is not an issue for
Robust Details as their details are deliberately designed to cope with variations, it would be strange if there was not a similar variation in other parts of dwellings from as- designed specifi cation to as-built specifi cation. If the fi nal as built specifi cation was not being properly entered into the as-built SAP, then that could lead to signifi cant differences between theoretical and actual performance. However, the latest testing from the Good Homes Alliance has shown as-built fabric performance broadly in line with SAP predictions. Another senior government
offi cial, David Wagstaff from DECC, added that energy performance certifi cates (EPCs) for new homes
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were being redesigned so that home energy performance could be ‘properly assessed and the right [improvement] measures identifi ed’. This would bring EPCs in line with the Green Deal, he said. Paul King, chairman of the
Zero Carbon Hub, called for the long-awaited defi nition of ‘allowable solutions’ to be issued by ministers, which would help to complete the picture on the zero carbon homes policy. The offi cials said there would be information on this in the March 2012 Budget, adding that the outcome would be in line with the Hub’s existing recommendations on ‘carbon compliance’ levels. Paul Morrell, the government’s
chief construction adviser, suggested that the industry needed an ‘Existing Homes Hub’ that would focus on making older dwellings low carbon. He said the new Green Construction Board was considering the case for such a body.
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March 2012 CIBSE Journal
11
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