ENERGY day Auditing energy efficiency in buildings. For durable solutions

Transcription

1 ENERGY day Auditing energy efficiency in buildings For durable solutions

2 When should assessments be performed? What aspects should be assessed? What are the catalysts for action? 2

3 Objective(s) Reducing energy consumption This kind of assessment can be paired with other objectives because of its nature and the method used to perform it 3

4 When should assessments be performed? 4

5 What kinds of assessments should be performed? General energy audits (GEA): Assignment involving a group of buildings, aiming to assess their performance level and to implement common or pooled action plans, or to look for synergies Energy efficiency assessments: Assignment involving one or several buildings (e.g.: the ones considered as having priority during an energy efficiency audit). This kind of study is more detailed than a general audit, as it defines tailor-made improvement measures. 5

6 What kinds of assessments should be performed? Feasibility study: Assignment performed in addition to an energy efficiency assessment or following a general audit. Study of the advisability of setting up a specific technical solution (energy production system, change in energy source) 6

7 Owner: Decision to launch project When should assessments be performed? Assistance to the Owner Plan for climate change Carbon survey Environmental approach to urban planning GEA Assessment Feasibility study Design & construction supervision Public management External contractor Additional studies Contractors PROGRAMMING DESIGN CONSTRUCTION OPERATION 7

8 When should assessments be performed? Plan for climate change and/or Carbon survey Area concerned Public authorities Environmental approach to urban planning GEA of a group of buildings Energy efficiency assessment of one or several buildings Feasibility studies Energy efficiency contract 1 year at least 6 months 3 months 8

9 General energy audits 9

10 For whom? Public authorities, managers of large real estate complexes Why? How? General energy audits To obtain an overview of the energy efficiency of a group of buildings: an energy efficiency snapshot of the assets To draw up a list of improvement actions that should be implemented, ranked by order of priority (with regard to financial & performance level criteria) To adjust the scope of action To draw up an action plan covering several years 1 - Collect data: drawings, contracts (heating, maintenance, consumption recordings) 2 - Develop technical expertise to assess energy efficiency performance levels 10

11 Energy efficiency assessments 11

12 Energy efficiency assessments For whom? Public authorities, social housing landlords, co-ownership associations, asset managers, tenants Why? Triggering factors: energy consumption, comfort (noise, temperature gradients, air flows), issues with exploitation, dilapidation of buildings, major maintenance/renovation works, etc. Important consequential topics that have not been expressed and that need to be identified Drafting of relevant works programme proposals, including costs and justifications 12

13 Energy efficiency assessments How? Collection of data: drawings, raw material and equipment characteristics, contracts (heating, maintenance, consumption recordings) Analysis of usages Technical expert appraisal to assess energy efficiency performance levels Additional measurements: temperature readings, building thermograms, consumption readings over a fixed period of time, lighting, efficiency, consumption or sampling, surveys 13

14 Température ( C) Temperature readings They can provide evidence of temperature regulation anomalies To optimise temperature regulation depending on the use of the premises Bureau administration Example: Administrative offices in a secondary school Premises overheated Heated during the weekend 14

15 Consumption readings To quantify each use To identify any potential switch-off periods 15

16 Building thermograms To identify a building s thermal bridges To assess the priority action areas in terms of improving doors & windows and insulation 16

17 Proposed improvements Immediate action: simple measures with no or little investment required, resulting in measurable energy improvements. Measures that can be implemented easily following the assessment, providing a quick return on investment Examples : Adjusting regulation parameters Adaptation/modification of usages Modification of the operating contract 17

18 Proposed improvements Building improvement and renovation actions: works on energy production systems and on the building envelope. These actions result in significant energy savings but require higher investment. This process must also include an economic study and the notion of a project: construction economists must be involved, and lessons learned (from previous projects) are very important Examples: Fitting of sensors and regulators, replacement of lighting fixtures, replacement of heat production installations, change of energy source, replacement of radiators, recovery of heat from air extraction systems Improvement of the building envelope insulation: insulation of façades and roofs, replacement of windows & doors 18

19 Proposed improvements Drawing up of coherent scenarios: Choice of priority actions: if the budget allocated to the works is limited, is it better to implement one very high performance level action or two average level actions? Leave open the possibility of performing or anticipating future actions Presentation of results: Cost of works and energy savings Overall cost or operating cost? Which period of time is considered? What future change in the cost of energy has been considered? Environmental aspects taken into consideration: embodied energy of materials used 19

20 Catalysts for action 20

21 Catalysts Opportunities for works Statutory obligations Compulsory energy consumption audits for buildings Thermal regulations for existing buildings Study of energy supply source Possible subsidies Tax deduction schemes: Eco-loans, tax credits, reduced VAT rates Subsidies: from ANAH (French Agency for Improvement of Housing), ADEME (French Environment & Energy Management Agency), Regional Council, etc. Energy Savings Certificates 21

22 Catalysts Energy Efficiency Contracts What are they? Outsourcing of energy management services A contractor commits to yearly operating costs in terms of energy In concrete terms: A public-private partnership An operation contract with a works section 22

23 Conclusions Optimisation of operating costs Improvement of usages and comfort Upgrading of assets 23

24 Thank you for your attention 24