Energy Management in Commercial Buildings trough metering

Transcription

1 :: Energy Management in Commercial Buildings trough metering Metering, Billing, CRM/CIS Europe Conference and Exhibition Barcelona, Johan Coolen, project leader energy management Cenergie cvba, Belgium

2 :: Content Cenergie Energy accounting: general information Energy accounting: life demonstration Energy benchmarking: e-bench

3 :: Cenergie Engineering office specialised in energy efficiency with main office in Antwerp (Belgium) Fast growing: 4 employees in 1997, 20 employees now Main references: 200 energy audits completed 830 buildings followed up with energy monitoring 75 building projects for which energy advice was supplied 15 building projects for which realisation of energy related techniques were coordinated 13 R&D-projects co financed by European and national authorities

4 ::What is energy accounting? To collect, process, analyse and report energy consumption data To compare these data with reference values and expected consumption Essential instrument for Rational Energy Use Registration is only advisable when you convert data into strategic information

5 :: From poorly organised data... Elektricity HVAC Cube Elektricity building 1 Fuel tank 2 Elektricity building 2 Fuel tank 1

6 :00 1 f eb jan feb mrt apr mei jun jul aug sep okt nov dec 0:00 2 feb 500 0:00 3 feb 1:00 0:00 5 feb :00 0:00 7 feb :00 0:00 9 feb :00 11 f eb :00 13 feb &Overschrijding 0:00 15 feb 0:00 17 feb Werkelijk Vermogen Aantal uur (h) Belastingduurkrom me per dag Besparing 0:00 19 feb :00 21 f eb :00 23 feb :00 25 feb :00 27 feb :00 29 feb :: To structured information... 2,400 2,200 2,000 1,800 1,600 Elektriciteit (kwh) 1,400 1,200 1, Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec werkelijk Cube intranet Glaverbel Elektriciteit verbruik (kwh) Erbis Server Erbis Database Glaverbel Elektriciteit vermogenprofiel Piekvermogen (kw) Glaverbel Elektriciteit verbruik (kwh) Elektriciteit (kwh/h)

7 :: Why energy accounting? Better insight in energy bills Keep track of abnormal energy consumption Evaluation of services of maintenance companies Optimisation of tariffs and choice of energy supplier in a free energy market Evaluation of energy saving measures Encourage energy consciousness Draw up budgets

8 :: Energy accounting how? Step 1: inventory meters Step 2: registration Step 3: processing data Step 4: reporting results Step 5: adjustment

9 :: Step 1: inventory meters Inventory main meters: electricity, natural gas, fuel oil and water intermediate meters: operating hours boilers, engines, internal energy meters,... Input meters in energy accounting program Input historical data (via energy bills)

10 ::Step 2: registration Manually via fill-in form via hand terminal or PDA Mostly monthly or weekly Automatically Telemetering Every 15 minutes, every hour or daily

11 :: Step 3: processing data Input meter readings monthly (manually) or permanent (telemetering) centralised via energy coordinator or decentralised via building administrators Analyse data and generate charts Interpretation meter readings

12 ::Step 4: report results Monthly follow-up of deviations: Registration of deviations between expected consumption and real consumption Feedback to building administrator via fax or or direct reading via the internet Ad hoc analysis and reporting Flexible reporting possible per target group Yearly report: evolution of energy consumption

13 :: Step 5: adjustment Locate cause of deviations Record specific problems Energy audit reveals hidden deficiencies Solving defects/problems Sensitisation Of energy coordinators/building administrators Of all parties involved

14 :: Advantages professional software Correction for degree days, working hours,... Gas consumption 2003: m³ Gas consumption 2004: m³ More consumption in 2004? Gas consumption (m³) Degree days (dd) m³/dd ,5 11 % energy saving!

15 :: Advantages professional software Correction difference between meter reading period and reporting period The period between 2 meter readings often differs from the reporting period Period between 2 meter readings Reporting period

16 :: Advantages professional software automatic and user friendly reporting, e.g. energy consumption on weekly, monthly, quarterly, yearly basis or basis of similar consumption data monthly consumption of several years next to each other in one chart connectable to building management and telemetering systems input of consumption data via internet, intranet or budgeting: allocation of energy costs to departments and products, comparison of tariffs of different energy suppliers,... Simple calculation of index numbers (benchmarking), e.g. consumption per m 2 per person

17 :: Example: sports centre Relighting in july 2002 Electricity savings: 40% or EUR/year 5000 Electricity (kwh) jan feb mrt apr mei jun jul aug sep okt nov dec

18 :: Example: sports centre Renovation heating system in june 2001 Natural gas savings: 31% of EUR/year Natural gas (m3) jan apr jul okt jan apr jul okt jan apr jul okt Real Expected

19 :: Example: Office Toilet rinsing out of order in january Water (m³) jan feb mrt apr mei jun jul aug sep okt nov dec

20 :: Energy accounting life demonstration on-line demonstration of professional energy accounting software (ErbisWeb)

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26 ::Energy benchmarking Definition of energy benchmarking = comparing energy consumptions between buildings ( energy accounting: comparing energy consumption of one building for different time periods)

27 :: Benchmarking with one or more variables? Equation coefficients electricity consumption (kwh/year) of offices Equation Const. Workingdays (kwh/working day) Surface (kwh/m 2 ) Cooled surface (kwh/m 2 ) Electr. heated surface (kwh/m 2 ) R % % % by adding extra explaining variables, a more reliable benchmarking of energy consumption becomes possible compared with the conventional single variable benchmarking method

28 :: Benchmarking of electricity consumption kwh Expected Verwacht 2 RealWerkelijk Other Presence of cooling Presence of electr. heating Total real Total expected

29 :: Advantages Fits very well with the Energy Performance Building Directive (EPBD) More detailed and reliable the the single variable benchmarking method Rational assigning of energy-audits

30 :: Advantages High quality and quantity of information generated with a minimal cost responsabilisation of building users and departments sensitisation decision makers by means of clear and reliable information

31 :: E-bench internet application including advanced benchmarking tools, on line full automatic inquiry of comfort and energy behaviour,... financed by European Interreg-programme and local and national authorities in Flanders (Belgium) and the Netherlands application will be available begin 2006

32 Questions? :: More info about slides: