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The Development of a Voluntary Display Energy Certificate Scheme (VolDECs)
For Commercial Offices
Malcolm Hanna, Technical Director, National Energy Foundation
Improving the use of energy in buildings
Contents
• Display Energy Certificates
• The need for VolDECs
• The VolDEC solution
• Pilot Results
• VolDEC benefits and costs
• Future developments
The issue for Landlords and Tenants
• No split between Landlord and Tenant
• Cannot show improvements (or not) in what each control
• DECs use one benchmark for all offices
• Many offices are ‘stuck’ at G
The Need
• A Simple entry-level engagement tool
• To engage building managers and encourage action
• Improve the benchmarks that underpin all DECs
• Set standards through an industry-wide scheme
• Encourage deeper analysis to benefit the whole industry
• Voluntary scheme without government
constraints
• Not for profit, for benefit of the industry,
backed by the industry
• To use authoritative sector specific
benchmarks
• To highlight performance and encourage
action
• To conduct benchmarking research for the
industry
• Soft start the commercial sector into
measuring performance
The VolDEC solution - aims
The VolDEC solution - the offering
• Easy access, quick, low cost
• No lodgement, no site visit, no advisory report
• Use the existing DEC methodology as the basis
• Use a ‘similar’ (improved) DEC certificate layout
• Include a certificate quality rating: HIGH/MEDIUM/LOW
• Better (& improving) benchmarks and categories, working with sectors
The VolDEC method
Statutory DEC VolDEC
Methodology Produced using the methodology described in CIBSE TM47
Produced using the methodology described in CIBSE TM47
Benchmarks Uses CIBSE TM46 benchmarks. This provides only one benchmark for all office types.
Uses ECON19 benchmarks for offices. This provides four different office types plus energy is broken down by end use for each type.
Landlord / tenant split
Unable to provide a separate landlord tenant DEC in the same building
Uses the granular energy breakdown in ECON19 to provide composite landlord and tenant benchmarks for 5 different building scenarios.
What do you need for a VolDEC?
• Building postcode
• Floor area
• Approximate hours of occupancy
• Annual energy use – landlord & Tenant
• Data year
• Main heating fuel type
What do you need for a VolDEC• Choose office type – closest match• Choose building Scenario – closest match
The benefits Provides landlords and tenants with energy performance for areas they control
Stand-alone entry level engagement toolsimple, easy access, inexpensive
Uses robust DEC method, with more appropriate benchmarks
Highlights energy performance, a clear driver for improving performance
VolDEC process highlights anomalies, the need for further checks
Better benchmarks, working with sectors
Indicative costs
• £250 per VolDEC (1-10 buildings)
• £150 per VolDEC (11-25 buildings)
• £100 per VolDEC (26-50 buildings)
• £75 per VolDEC (51+ buildings)
• Dependent on data format and data quality
• Excludes sector/client tailoring
• Excludes any re-runs due to bad data
Future developments
• Water and waste (Environmental VolDEC)
• Floor by floor (individual tenant VolDEC)
• Shopping centres (new sector)
• On-line self-input
• Annual Benchmarking analysis and organisational reports
Improving the use of energy in buildings
AcknowledgementsDebbie Hobbs, Sustainability Manager, Legal and General PropertyAdam Fjaerem (formerly JLL)Nigel Brock (NEF)