Rīgas Tehniskā universitāte Enerģētikas un elektrotehnikas fakultāte Vides aizsardzības un siltuma sistēmu institūts www.videszinatne.lv Why residential energy efficiency moves slowly and how to speed it up? Prof.Andra Blumberga Riga Technical university 27.04.2011. 6th Baltic Housing Conference Energy Saving in the Residential Sector- Country Experiences, Tallinn
System archetype: Energy Addiction + Addiction Atkarība no to importa + Symptomatic Simptomātisks solution: risinājums: IMPORTS + Enerģijas Energy deficīts deficit + Fundamentāls Fundamental risinājums: solution: ATJAUNOJAMIE RENEWABLE ENERGY SOURCES ENERGORESURSI and ENERGY EFFICIENCY ENERGOEFEKTIVITĀTE
LATVIA S POLICY ON BUILDING ENERGY EFFICIENCY
National energy end-use and energy efficiency goal
In 2010 Residential 52 GWh Energy efficiency goals Agriculture Transport 0 GWh Total 4 GWh In2016 Industry 3 GWh 67 GWh Services 8 GWh Agriculture 11 GWh Residential 2701 GWh Total 3483 GWh Transport 204 GWh Industry 159 GWh Services 408 GWh
Policy measures in residential sector Energy audits in buildings and building energy certification Subsidies for energy efficiency measures in multi-apartment buildings Informing energy consumers Development of secondary legislation
70 60 50 40 System dynamics model base scenarios: technology diffusion 3rd scenario (optimistic) 2nd scenario (moderate) 30 20 10 0 1st scenario (pessimistic) Years
1) Netbenefits max 2) Uncertainty costs min
Energy efficiency policy tools used in the system dynamics model Energy consumption standarts; Quality of energy audits; Reaserch and develpment; Standard procurement documentation and contracts; Quality control of construction works; CO2 tax; Subsidies; Energy service companies; Information distribution; One stop shops; Champion effect.
Existing policy tools tika izslegta; 40 000 000 itika ieslegta Total_Insulated_Area 60 000 000 50 000 000 30 000 000 20 000 000 1 1 1 10 000 000 1 1 1 2 2 1 2 2 01 2 2 2 2 olitika 2 010 2 020 2 030 2 040 2 050 2 060 2 070 2 080 a; 0.8 esosa With subsidies(1) and without subsidies(2) it is possible to save only 55 GWh until 2016, i.e. 2% of the planned savings. the required reduction in consumption using this policy could not even be achieved by 2080. Energy audits in buildings and building energy certification Subsidies for energy efficiency measures in multi-apartment buildings Informing energy consumers Development of secondary legislation
No 1. Energy efficiency policy Development of onestop shop With energy efficiency policy Implementation of First Energy Efficiency Action Plan, % 3.3 % 2. Introduction of CO 2 tax 3.2 % Increase in minimum 3. energy efficiency requirements Increase in research 4. and development support Development of standard procurement 5. documentation and contracts Introduction of 6. information campaign All energy efficiency 7. policies simultaneously 2.0 % and development 5.6 % 3.5 % 2.5 % 21.6 % 8. Only subsidies 2.0 % tika izslegta; 40 000 000 itika ieslegta Total_Insulated_Area 60 000 000 50 000 000 30 000 000 7 7 4 5 3 7 3 4 5 1 7 3 4 5 1 3 4 5 7 1 2 20 000 000 7 4 5 1 2 6 10 000 000 2 1 6 8 3 6 2 8 6 4 5 6 8 6 8 6 8 1 2 8 8 7 3 olitika 01 2 3 4 5 6 8 2 010 2 020 2 030 2 040 2 050 2 060 2 070 2 080 it is possible to save only 583 GWh by 2016, i.e. 21.6% of the planned savings. the required reduction in consumption using this policy could only be achieved by 2020. 1 2 2 11
ENERGY SERVICE COMPANY IN RESIDENTIAL SECTOR IN LATVIA
Multi-family building in Gaujas ielā 13, Valmiera Heated area 1914,6 m 2 High energy consumption for heating (183 kwh/m2year) and hot water preparation First ESCO project in residential sector in Latvia Sun Energy Baltics
Before renovation U=0.82 W/m2K 30 mm 150 mm 220 mm
Before renovation U=1.18 W/m2K U=2.4 W/m2K U=1.36 W/m2K U=2.8 W/m2K
Heating system
Heating and hot water system Connection to appartment Hot water heaters
Energy consumption before renovation 450.00 400.00 350.00 62.0 72.3 51.3 33.3 300.00 37.4 38.2 /year 250.00 MWh/ 200.00 150.00 276.7 289.4 357.0 100.00 50.00 0.00 2006 2007 2008 Normalized space heating DHW preparation DHW circulation losses
Energy efficiency measures Wall insulation (10cm) Insulation of attic (20cm) and basement ceiling (10cm) Changing of windows Changing of doors Change of hot water system Partly change of heating system Reconstruction of heating substation Monitoring system
Improvements in heating system
Renovation of hot water system Water meter Flow measurement Prefabricated heat insulation
Monitoring system Regulation of heating and hot water systems Consumption data collection Inhabitants can follow energy consumption Control of internal comfort Warning on deviation from the target(e-mail..)
Additional measures
Investments, EUR Measure EE measure Non-EE measures Total Building envelope insulation 60494 4643 65137 Renovation of roof 3353 3353 Changing windows 21673 4113 25786 Fixing balconies 17031 17031 Stair cases, entrances 20181 20181 Ventilation systems 2644 2644 Other costs 10354 7951 18306 Renovation of heating substation 5907 5907 Renovation of heating system 21014 21014 Renovation of hot water system 21711 21711 Monitoring system 5186 5186 TOTAL 146340 59917 206257 Specific investment = 107 EUR/m2
After energy efficiency measures 450.00 400.00 350.00 300.00 61.9 36.3 savings 50% 191.9 MWh/yea ar 250.00 200.00 150.00 307.7 20.1 36.9 100.00 157.0 50.00 0.00 Exisitng Forecast Normalized space heating DHW preparation DHW circulation losses Energy savings
Indoor comfort Average indoor temperature: Gaujas 9: +18,3 o C Gaujas 11: +20,0 o C Gaujas 13: +21,6 o C o C 21 Telpas gaisa tem peratūra, 20 19 18 17 16 15 1 2208 4415 6622 8829 11036 13243 15450 17657 19864 22071
Compared to other buidings