BREEAM 2011
Ene01
Reduction of CO2 emissions
BREEAM 2008 schemes assess the CO2 emissions of a building through the Energy
Performance Certificate (EPC) rating, or the CO2 index. This form of assessment
would not work with the changes to Part L that were introduced in October 2010,
so BRE has changed the way in which criteria is assessed in BREEAM 2011 New
Construction (NC). There are still 15 credits available, with an additional five up for
grabs in the innovation section.
The new rating benchmark is the EPRNC (Energy Performance Ratio for New
Constructions). This metric is calculated using data from the National Calculation
Method (NCM) and addresses three parameters:
•
•
•
Operational energy demand (notional/actual)
Energy consumption (notional/actual)
Total resulting CO2 emissions (notional/actual)
}
All found towards
back of Part L output
Each parameter is influenced by different building/system properties and has been
allocated a weighting to contribute to the overall EPRNC:
Parameter
Definition
Influences
Allocated Weighting
Energy Demand
How well the building
reduces heating and
cooling energy demand
Influenced by building
fabric heat loss (U values)
and air permeability
0.28
Energy Consumption
How efficiently a building
meets its energy demand
Influenced by the type/
efficiency of building
services systems
0.34
Total CO2 Emissions
How much CO2 the
building will emit in
order to meet the energy
demands
Influenced by building
fabric performance,
systems efficiency and
fuel source
0.38
Importantly, BREEAM Ene 01 can now assess ‘unregulated’ as well as ‘regulated’
energy, something that was previously left out.
Under BREEAM NC 2011, it is not possible to reach 15 credits without taking into
account the energy demand and consumption and just meeting Building Regulations
will achieve 0 credits.
Inputs for Ene 01 calculator:
Intelligent engineering for sustainable buildings
From the Ene01 calculator output, BREEAM credits are allocated via the following
tables:
Exemplary level – five additional credits:
The full five credits can be achieved if the building is defined as ‘carbon negative’ (in
terms of total modelled operational energy consumption).
Key terms:
Carbon negative = where an excess of renewable or carbon neutral energy is
generated from the building (surplus to own regulated and unregulated demand) and
exported to the National Grid. Ultimately, the building becomes a net exporter of zero
carbon energy.
EPRNC = Energy Performance Ratio for New Constructions.
NCM = National Calculation Method – this is used to demonstrate compliance with
the Energy Performance of Buildings Directive.
TER = Target Emission Rate.
Regulated energy = energy consumption from fixed building services.
Unregulated energy = energy consumption from non-controlled systems, either
integral to the building (lifts, escalators, fume cupboards etc.) or operational
equipment (servers, printers, computers etc).
Method Consulting LLP
Berkeley House, Hunts Rise, South Marston Park, Swindon SN3 4TG
Telephone 0845 89 49 169
Email [email protected] www.methodllp.com