Measuring changes in energy behaviours in complex non-domestic
buildings Paula Morgenstern UCL Energy Institute Supervision: Paul
Ruyssevelt Rokia Raslan
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Staff-centered energy conservation Potential Realised success
Intervention Organisation Individual Evaluation
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Challenges for evaluation Methodology Complexity of building
energy use Non-energy effects
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RQ: To what extent can effects of behaviour changes be detected
through the analysis of energy consumption profiles in complex
buildings given the daily variability in activities and resulting
energy use itself?
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Case study Investigation of the evaluation of an energy
awareness campaign at a large UK acute hospital Intervention
approach: 1.Carbon Champions at ward level 2.Rewards for successful
champions and teams 3.Senior management endorsement Close
involvement from January to May 2013 in analysing the hospitals
electricity use over the course of the campaign
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Analysis of departmental electricity use kWh/d as useful metric
based on four weeks of pre and post campaign data
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Analysis: Inclusion criteria Identifying statistically
significant changes in mean daily electricity use I. International
Performance Measurement and Verification Protocol (IPMVP): savings
need to be larger than twice the standard error () of the baseline
value
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Analysis: Inclusion criteria II II. More conservative estimate:
Savings statistically valid if they exceed twice the sum of the
standard error of both baseline and post-intervention value III.
Repeated measures t-test Pre and post sets differ at significance
level 0.05
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Comparison of analysis approaches >> Results of the
different analysis approaches differ as much as the actual effect
size of the energy awareness campaign was thought to be across the
whole hospital # of areas meeting inclusion criteria Average
campaign effect size across the whole hospital Control: All metered
areas 49 X % Inclusion criteria I 35 1.3*X% Inclusion criteria II
18 1.5*X% Inclusion criteria III 20 2.5*X%
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Looking behind headline figures Detailed analysis of
consumption profiles Observations
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Discussion Importance of methodology used to estimate energy
savings so far no standardised methodologies Discussion needed
between campaign developers, building operators and independent
evaluators Can individual energy behaviours reliably be placed
within the context of total building energy use in complex
non-domestic buildings?
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Intermediate performance indicators? Specific Impact orientated
Systematically recorded
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Going forward I Improving the understanding in complex
buildings Increased monitoring in detail Building energy use Energy
behaviours
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Going forward II Promoting learning through honest accounts of
what worked and what did not in both design and implementation of
initiatives Headline reporting What worked?
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Questions or comments? Thank you for your attention.