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Construction Studies An introduction to Building Energy Rating.

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Presentation on theme: "Construction Studies An introduction to Building Energy Rating."— Presentation transcript:


2 Construction Studies An introduction to Building Energy Rating

3 Building Energy Rating (BER) grades the energy efficiency of a building A Dwelling with a high rating will save the owner/ occupier money in energy costs.

4 Important dates for the BER New dwellings that apply for planning permission on/after 1st. January BER required for: All existing buildings offered for sale or rent from 1st. January 2009.

5 Building standards & energy use Primary Energy kWh/ m 2 per year Irish construction standard/year Typical for Building Regs Part L 2005 Building Regulations 2007/08 Low/ Zero Carbon

6 Main factors effecting BER Thermal insulation of the building envelope. Heat gains through glazed openings. Ventilation and air permeability. Domestic hot water system and control. Space heating control and energy required. Lighting and internal heat gains.

7 What does BER measure? The BER measures energy use per square meter (floor area) of the dwelling per year. Measurement Unit kWh/m 2 /yr Kilo watt / hour 1 kWh of electricity costs 18 cent

8 Energy Labelling Domestic Appliances Energy labelling informs the consumer of costs.

9 What is Building Energy Rating? Calculated using DEAP software. DEAP – Dwelling Energy Assessment Procedure BER scale (kWh/m 2 /yr) A1,A2,A3,B1,B2,B3 etc. CO 2 indicator (kg/m 2 /yr) BER rating

10 Building Energy Rating (BER) Label Each full band is 75 kWh/m 2 /y and is indicated by a change of colour on the label. Each small band is indicated by a change in the grade. Example: A1 to A2 to A3 FULL BAND

11 Energy Costs and BER Cost comparasions based on average energy costs for 2007 in a 250m 2 dwelling

12 Current Building Regulations A dwelling built to the 2007/08 building regulations should achieve a: B or C rating

13 No obligatory minimum standard applies. BER must be produced by a registered BER Assessor. BER is valid for 10 years unless changes are made to the building. The BER is independant of how the occupants behave in the building. An advisory report must accompany a BER certificate Building Energy Rating (BER) ?

14 Accompanying Advisory Report New build: To advise owners on how to use the features in the building to maximise energy efficiency Existing buildings: To advise owners on the options for upgrading of building to maximise its energy efficiency

15 Calculating the BER Download from: DEAP Computer Software

16 Domestic Hot Water Details Central Heating Details Energy used for light Floor Heat Loss Roof Heat Loss Wall Heat Loss Dwelling Reference Ventilation Information required for DEAP 45 individual inputs are needed to do a BER assessment on a dwelling on DEAP Door heat loss Heat gains and losses through windows Construction type Heat loss through thermal bridges Living Area Heated to 21°

17 Information required for DEAP 1. Dimensions: The internal dimensions of the building envelope. New dwellings can be measured from the plans. Existing buildings may need to be surveyed.

18 Information required for DEAP 2. Ventilation Details Number of fans and vents Number of chimneys/flues Number of sheltered sides Presence of a draught lobby or porch. Method of ventilation: Natural or Mechanical

19 Information required for DEAP 3. Air Permeability Sealing of the building envelope. Blower door testing required on new dwellings. Required to be 10 m 3 /(h.m 2 ) for new 50 pa.

20 Ceiling/Roof U-Value 4. Building elements (fabric heat losses) Information required for DEAP Wall U-Value Floor U-Value Door & Window U-Values Thermal bridging factor typical 0.11 W/m 2 K

21 Information required for DEAP 5. Glazed area heat losses and gains Glazed area sizes. Orientation. Glazed unit U-Values - Glazing - Frame Solar transmittance.

22 Information required for DEAP 6. Details of the hot water system Instant or storage system. Insulation on pipe work. Level of Insulation on storage cylinder Temperature and time controls.

23 Information required for DEAP 7. Boiler and space heating details Boiler efficiency % Fuel used Heating controls Radiator’s or under floor heating

24 Information required for DEAP 7. Boiler and space heating details contd. Insulation on pipe work. Temperature and time controls. Weather compensation controls.

25 Information required for DEAP 8. Renewable energy used, e.g. Solar photovoltaic Wind power Geothermal energy Solar Water heating

26 9. Lighting provision in the dwelling. The percentage of energy efficient light fittings in the dwelling. Information required for DEAP

27 The heating requirements for the dwelling will depend on: Information required for DEAP 10. Net space heat demand. Living area is assumed to be heated to 21 o C and the rest of the dwelling heated to 18 o C. The living area %. The total volume.

28 11. Thermal mass category of the building ranging from: Thermally massive construction. e.g. concrete block with hollowcore. Information required for DEAP Thermally light construction e.g. timber frame

29 Download the DEAP software from: Install the software as per instructions. Use the software to do a sample rating on the sample dwelling using the data supplied. Vary the inputs to improve the rating. Energy rating worked example

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