EPBD – National Calculation Method & SBEM• And perhaps to generate a comparative rating...
Transcript of EPBD – National Calculation Method & SBEM• And perhaps to generate a comparative rating...
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EPBD – National Calculation Method & SBEMMike JaggsBRE Environment
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SBEM produces an Asset Rating• The calculated intrinsic performance of the building as built• Normalised to standard conditions (weather, occupancy)• Recognises different ‘activity areas’• Applicable to both new and existing buildings• Automatically generates the appropriate Notional Building as the
baseline• Used to demonstrate compliance with minimum standard• And perhaps to generate a comparative rating (‘A-G’ or 0-100) • Used to compare one building with others• Also need a ‘Design rating’ before building is built
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The rating and compliance test - NCM
Notionalbaseline
2002 Elemental standards
Fabric & plant
CalculationTool
Inputdata
StandardActivity
Schedule
ProjectedCO2/m2/yr
ProposedFabric & plant
Buildinggeometry
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The compliance test
Notional xImprovement %
= Target
2002 Elemental standards
Fabric & plant
CalculationTool
Inputdata
StandardActivity
Schedule
Proposed
ProposedFabric & plant
Buildinggeometry
Articles 4 & 5Asset Rating
Is P>T? OKN
Revisedesign
Y
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The rating - NCM
Notional2002 Elemental
standardsFabric & plant
CalculationTool
Inputdata
StandardActivity
Schedule
Actual
ActualFabric & plant
Buildinggeometry
Article 7 Asset Rating
Compare
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Asset Rating - the calculation methodologyA methodology which calculates ‘integrated energy performance of
buildings’ (Art 1),
• Taking account of (Annex):− Indoor conditions− Fabric performance− HVAC and DHW− Lighting and daylighting− Position and orientation− Passive design features− Renewable and chp options
• For a wide range of non-domestic buildings• For a standardised use of the building (Art 2)
• (Domestic buildings will use SAP)
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Definitions and scope
• National Calculation Method (NCM)– Deals with Part L2 Compliance– And with Asset Ratings (not Operational Ratings)– Includes standard databases for building components and activities– Allows the use of different calculation cores, including accredited
simulation tools– Encourages the development of different user interfaces
• Simplified Building Energy Model (SBEM)– Developed by BRE for DCLG
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The SBEM development project
• An important project for BRE• Funded by ODPM via Faber Maunsell• To produce a ‘simple’ tool• To comply with the emerging CEN standards• To cover the majority of ‘ordinary’ buildings• To complement more sophisticated simulation-based methods• Based on the Dutch NEN2916 method
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Article 10 – who can use SBEM?
• ‘…in an independent manner…’• ‘…by qualified and/or accredited experts..’
• Needed for both Building Regs and EPBD Article 7• Training courses available • Accreditation scheme launched by BRECertification
• Try it – at www.ncm.bre.co.uk
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EPBD – National Calculation Method - overview
UserInterfaceiSBEM
Calculation coreSBEM
Interface
Activity Database
Fabricdatabase Service
database
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Describing the building - key stages
• Geometry– Overall building layout– Distribution of activity areas
• Construction• Systems • Controls
• Two different input routes:– New build – from plans– Existing buildings – from brief survey and, eg, log book data,
supplemented by inference
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Existing buildings: Inference procedures - fabric
• Wall/roof/floor construction• U-values• Glazing areas and performance• Thermal mass effects• Infiltration rates
• Based on available data:– Age (eg Building Regs in force at construction)– Generic system– Building type
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Activity areas – distinct areas with distinct impacts on energy use
Will include, for example:
• Cellular office• Open-plan office• Sales area - ambient• Lecture theatre• Sports hall• Storage - chilled• Toilets• Stairs
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Activity schedules – to include• Occupancy density
• Occupancy schedule
• Design temperature set-points
• Design ventilation rate
• Target illuminance
• Equipment gains
• DHW requirement
• Humidification if essential
• Standard values for Asset Rating
• (Tailored values for Tailored rating could be possible)
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NCM Activity database
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NCM Construction database
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iSBEM – General information
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iSBEM – Help functions
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Project database – setting up constructions
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Drop-down options
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Defining zone geometry and activity
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Defining the envelope
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Checking the zone envelopes
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Defining the services
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The domestic hot water system
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The compliance check calculation
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More detail for the Asset Rating
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Part of output information
WHOLE BUILDING ENERGY AND CARBON DIOXIDE PERFORMANCE
Carbon Dioxide Emissions (KgCO2/m2●annum)
91.93 KgCO2/m2●annumBuilding CO2 Emissions Rating (BER) for building as designed
92.65 KgCO2/m2●annumTarget CO2 Emissions Rating (TER)
0.1LZC benchmark
0.2Improvement factor
128.65 KgCO2/m2●annumCalculated CO2 emission rate for the notional building
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9 Are the U-values better than the design limits?“Not better than design limits”
* Display windows and similar glazing are not required to meet the standard given in this table.
"No Roof ventilators in project"
0606Roof ventilators (inc. smoke vents)
"No High usage entrance doors in project"
0606High usage entrance doors
"No Vehicle access doors in project"
0401.5Vehicle access & similar large doors
"No Personal doors in project"
0302.2Personnel doors
zone 1/w/g5.2793.35.2792.2Windows* and rooflights
zone 1/c0.240.350.240.25Roof
zone 1/f0.330.70.330.25Floor
zone 1/w0.320.70.320.35Wall
Surface where this maximum value occurs
Calculated individual element U-values [W/(m2 oK)]
Limiting individual element U-values[W/(m2 oK)]
Calculated area weighted U-values [W/(m2 oK)]
Limiting area weighted average U-values[W/(m2 oK)]
Element