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News analysis Regulations
> aiming for excessive levels of on-site could meet a lower target than
generation – for example Code 6 in others.
its current form. “But, while many new buildings
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“Larger carbon savings could be built to Part L 2006 meet the target
made, for less investment, by using on paper, the reality is that there is
this fund to target energy efficiency often a major disconnect between
such as additional insulation and the actual operational performance
low-energy light bulbs in the existing of a building due to factors outside
stock.” the designers’ influence.”
However, the Royal Town
Carbon savings Planning Institute (RTPI) welcomes
DCLG says that, if the changes the “tough” target. Robert Upton,
proposed in the new Part L 2010 its secretary general, says: “If we are
consultation document were put to achieve our targeted reduction of
into practice, it would save 3.3 carbon emissions of 20 per cent by
million tonnes of CO2 emissions a 2020 as the minister indicated, we
year from 2020. Warren emphasises have to act now. The government
that there are a great many elements is demonstrating its clear
that are worthy of praise within the commitment to delivering a long- SBEM focuses on the convergence
Part L 2010 document – such as the term solution to our climate change of results with Dynamic Simulation
proposed changes for new builds challenge and is not being blown Models (DSMs). Building typology
The new housing
and conservatories, and the steps off target by the current economic is now linked to planning classes
minister is still
taken to ensure buildings comply situation. with simplified activity types below
with the Building Regulations. “It’s time for planners, architects this. getting his feet under
Davies also believes there and developers to step up to Russell-Smith is hoping that
the table, and I hope
is much that is good about the the mark and respond to this the calculation tools and software
proposals, particularly the increase challenge.” for Part L 2010 will also recognise he can find a way
in the size of the sample of innovative or emerging low carbon
dwellings to be air-tightness tested. Tool box technologies. He says this was
to catch the rather
Indeed, Jestico is very much in To help support meeting this not the case for Part L 2006, valuable thing that
favour of the 25 per cent reduction aggregated national target of 25 per which failed to allow the use of a
in CO2 emissions required for cent, the calculation tools used to number of proven and effective
has just fallen off it.
both domestic and non-domestic create the target CO2 emissions technologies.
– Paul King
buildings: “It is a sensible step on rate (TER) for new buildings and “This software ‘straightjacket’ has
the path to zero carbon homes large extensions have been adapted. severely restricted our industry’s changes will help the government
and other buildings in 2016 and New versions of the Standard ability to innovate and rise to the hit their ambitious carbon reduction
2019 respectively, although the Assessment Procedure (SAP2005) challenge of delivering a low carbon targets: “It has to help to move
new mechanisms for calculating and the Simplified Building Energy economy. along this process, it’s probably the
the emissions using the proposed Model (SBEM) are now available for “The government needs to last time there are going to be these
‘aggregate’ approach will take some building services professionals to understand that we will only get relatively easily achieved fixes. [Part
getting used to.” use and provide feedback. close to meeting ambitious targets L in] 2013 will be much tougher.”
But Geoff Russell-Smith, general The Building Research if engineers can draw upon a full He believes that the document
manager at Tarmac TermoDeck, is Establishment has developed this range of low-carbon technologies.” does what it says on the tin – gets
concerned that the new aggregate new version of SAP for DCLG, so Terry Dix, a director at Arup the industry to its targets using
approach might cause difficulties: that it uses monthly rather than and chairman of one of the main that trajectory. But he feels the
“It is likely that, under a new annual weather data, with factors advisory panels to government difficult issue is going to be that
aggregated system, some buildings to address thermal mass, while for Part L, does believe the overall it’s a predicated answer. Much
Snapshot of some key Part L changes
CO2 performance targets • SAP (Standard Assessment to create new technologies. For Efficient operation
• CO2 emissions from the actual Procedure) and SBEM (Simplified non-dwellings, the 2010 targets are • Produce information using
building should be compared with a Building Energy Model) or DSM based on the amount of glazing in the guidance in CIBSE TM 31
TER (target emission rate) based on (Dynamic Simulation Model) to each building. Building Log Book Toolkit for
a hypothetical reference building of be retained, but with the software non-domestic buildings to
the same shape and size. packages updated. Changes are Limits of design flexibility ensure the building is being
• An aggregated 25 per cent currently being consulted on by • In new builds, builders are free operated and maintained
improvement on 2006 standards DECC (Department of Energy and to consider using renewable correctly.
for all new buildings, resulting in Climate Change). technologies to hit emissions based • A suitable set of operating
an overall reduction rather than • A separate, temporary targets. and maintenance instructions
a 25 per cent reduction on every specification is proposed for electric • It is proposed the present system should be created for use in new
building. resistance heating in new homes. It of ‘backstops’ is to be adjusted to homes to ensure the building
• All new non-domestic buildings to will eventually have the same fabric strike a balance between energy is being used and maintained
be zero carbon by 2019. specification as other fuels (not efficiency and design flexibility. correctly.
• The present regulatory framework just fossil fuels) and be based on a • Builders have the option of being • The occupiers should also be
is to be retained, with builders free heat pump solution. This change innovative in their designs, which given the recommendations
to select their own CO2 reducing will be made progressively to give can be judged on a case by case report from the energy
solutions. the electrical heating industry time basis. performance certificate.
16 CIBSE Journal July 2009 www.cibsejournal.com
CIBSEjul09 pp14-17 newsanalysis.indd 16 25/6/09 15:44:33
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