Energy efficiency naoise f
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Energy Efficiency
Naoise Fleming
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Contents
1. Some Key Facts2. The Governments involvement3. The Kyoto Protocol4. BER Assessment5. Case study:A2 rated house V. C3 rated house6. Grants available
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Some key facts
• Energy use is responsible for two-thirds of Irelands green house gas emissions
• Domestic dwellings account for a quarter of all energy used in Ireland
• The average home in Ireland consumes 40% more electricity than it did in 1990
• Renewable energy accounts for just over 2% of Ireland’s energy supply.
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The Government
• The Government has committed to achieving, in 2020, a 20% reduction in energy demand across the whole of the economy through energy efficiency measures. Recognising that Government must lead by example, they are committed to achieving a 33% reduction in public sector energy use.
• Every year Irish consumers export nearly €6 billion from our economy buying energy from overseas.
• The housing sector is the single largest consumer of energy in this country, accounting for almost 30% of energy use and CO2 emissions
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Kyoto Protocol
• The EU recognised that energy efficiency is the single most cost-effective way of meeting our Kyoto objectives. “An energy efficient building provides the required internal environment and services with minimum energy use in a cost effective and environmentally sensitive manner”
• Buildings are the biggest users of energy in Europe, representing approximately 40% of energy consumption in the EU
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• The Kyoto Protocol came into force in 2005 and the proposed targets of reducing Greenhouse emissions by an average 5% compared with 1990 levels by the period 2008 - 2012 and became legally binding for the 15 member states.
• Ireland’s target under the Kyoto Protocol was to limit Greenhouse Gas emissions to 13% above 1990 levels. That level was reached in 1997.
• Ireland’s greenhouse emissions will be some 19% above 1990 levels by 2012. This will lead to the purchases of allowances through the Kyoto Protocol’s flexible measures.
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BER Assessment
• As of 2006,a Building Energy Rating (BER) certificate is required at the point of sale or rental of a building, or on completion of a new build.
• The BER is accompanied by an "Advisory Report" setting out recommendations for cost-effective improvements to the energy performance of the building.
• There will be no legal obligation on vendors or prospective purchasers to carry out the recommended improvements.
• €5000 fine and/or 3months imprisonment• Sunday times article, one house received three different
ratings, D2, E1 and E2. €275, €350 and €358. 3 hours, 2 hours, 1 hour.
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BER ScaleThe energy performance is expressed as primary energy use per unit floor area per year (kWh/m2/yr) represented on a scale as shown in. It runs from A1, most efficient to G least efficient. To obtain an A1 rating the building must have an energy performance of less than 25 kWh/m²/yr. G rated buildings have an energy performance greater than 450 kWh/m²/yr. New domestic buildings complying with the current regulations will be expected to rate as either possibly a B3 or C1.
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Case Study A2 Rated House V C3 Rated House
• The SEI reveals that building an A rated passive house is on average between 6 per cent and 8 per cent more expensive than building a conventional house with a C3 rating.
• Market research gained through the Cepheus report reveals that other European countries such as Germany, Switzerland France shows extra building costs of approximately 10 per cent
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Construction Costs
C3 rated Conventional Home
Construction Costs
Area (m2) Cost Per M2 Total
236 €1,188 €280,368
A2 rated Passive House
Construction Costs
Area (m2) Cost Per M2 Total
236 €1,346 €317,656
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Conclusion
• The A2 rated passive home is 13.3 per cent more expensive. The location of this building, in a rural village in the west of Ireland increased the construction costs as the suppliers of energy efficient building products are not as easily accessed.
• Another point to note is that contractors may have to come from further distances as the construction of an A rated passive house is quite complex and not all local contractors have the capabilities to build such a dwelling which will also affect construction costs.
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Running CostsC3 rated Conventional Home
Running Costs
Expected electricity and fuel consumption per annum Quantity Total
250,000 kwh/m2/yr €1,800
A2 rated Passive House
Running Costs
Expected electricity and fuel consumption per annum Quantity Total
5,900 kwh/m2/yr €750
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Conclusion
• It is clear to see that Construction costs for building an A2 rated passive home are more expensive than building a conventional home. The difference in running costs is found to be €1050. It would take 34 years for the owner to make a return on the investment. After this period the initial extra cost of building an A2 rated passive house will begin to make a return.
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GrantsHome Energy Saving (HES)
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The Greener Homes Scheme
Biomass Boiler €3,000
Biomass Stove €1,100
Biomass Stove w/ Integral Back Boiler €1,800
Heat Pump Vertical Ground €3,500
Heat Pump Water to water €2,500
Heat Pump Air Source €2,000
Solar Flat Plate (to max. of 6m2) €250/ m2
Solar Evacuated Tube (to max. of 6m2) €300/ m2
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The Warmer Homes Scheme• This scheme aims to improve the energy
efficiency and comfort conditions of homes occupied by low-income households who cannot necessarily afford the other two schemes above. It includes; attic insulation, draught proofing, lagging jackets, energy efficient lighting, cavity wall insulation and energy advice.
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Recap
1. Some Key Facts2. The Governments involvement3. The Kyoto Protocol4. BER Assessment5. Case study:A2 rated house V. C3 rated house6. Grants available
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The End