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RDSAP 2009 Getting to grips with the changes Mike Tofts Client Services.

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Presentation on theme: "RDSAP 2009 Getting to grips with the changes Mike Tofts Client Services."— Presentation transcript:

1 RDSAP 2009 Getting to grips with the changes Mike Tofts Client Services

2 Welcome & Introductions Welcome About National Energy Services Attendees?

3 Purpose Provide details of the changes to RDSAP2009 Provide guidance on dealing with the changes Identify how new assessments will be affected by the changes Demonstrate with worked examples

4 Agenda Background Changes to SAP2009 Changes in the RDSAP Methodology – Construction data Break Changes in the RDSAP Methodology – Building services Changes in the content and format of the EPC Q & A, discussion

5 RDSAP 2009 From 17 th April 2011 the version of RDSAP used to produce EPCs for existing dwelling is changing RDSAP 2009 introduces some new data items and uses the recent SAP 2009 methodology for the calculation Is referred to as RDSAP2009 as it is based on the SAP2009 methodology

6 Why change RDSAP? Incorporate changes introduced in the main SAP methodology Include changes through feedback from assessors and users that have been approved by CLG (Conventions Group) Incorporate new data collection items to make the assessment more accurate, i.e. ongoing technical development of the RDSAP methodology

7 SAP Methodology Changes

8 SAP Changes affecting RDSAP Calculation basis changed Heating energy calculation Multiple heating systems Thermal mass parameter Hot water usage Heating system data enhancements Fuel Prices CO 2 emissions factors

9 SAP Changes not affecting RDSAP Cooling energy included Multiple ventilation systems Party wall performance criteria Thermal bridging parameters Multiple wind turbines Heat recovery from showers Heat recovery from flues Multiple special features (Appendix Q)

10 SAP Calculation Basis SAP 2009 now calculates the heating and hot water requirement on a monthly basis rather than an annual basis as per SAP 2005 and is therefore more accurate

11 SAP Heating Energy Split winter/summer boiler efficiencies - There are different boiler efficiencies for winter and summer months For example a boiler with an annual efficiency of 90% has a summer efficiency of 80.8% and a winter efficiency of 90.9%

12 SAP Multiple Heating Systems Two main heating systems plus secondary Separate presentation section later

13 Thermal Mass Parameter Full SAP now includes a range of variables (low/medium/heavy) to identify thermal mass of the dwelling RDSAP now includes a single mid-range medium weight default value for all dwellings Significance of thermal mass ?

14 Hot Water Usage Estimates for hot water usage are now lower in SAP2009 Usage previously based on linear extrapolation of persons /m 2 Revised equation now plateaus for larger dwellings earlier Hot water usage will be reduced for larger dwellings

15 Occupancy SAP2009 SAP2005

16 Heat Pump Systems Heat pump options now incorporated in Product Database Separate RDSAP presentation section later

17 SAP 2009 – Fuel Prices New fuel prices for SAP2009 Rolling 3 year average to bring costs up to date Fuel prices increased will influence, i.e reduce SAP 2005 Ratings ?

18 Fuel Price Changes - Examples Table 12SAP 2005SAP2009 Standing Charge (p/day) Unit price (p/kWh) Standing Charge (p/day) Unit price (p/kWh) Variance (%) Mains Gas341.631063.1+90 Bulk LPG623.71705.73+54 Heating Oil2.174.06+87 House Coal1.912.97+55 Smokeless2.673.73+40 Wood Logs2.23.42+55 Electricity7.1211.46+61 Electricity Off Peak 207.65 / 2.9412.82 / 4.78+68 / +63

19 SAP 2009 – Fuel Prices

20 Deflator removes inflationary increases Measure of relative cost performance Gas performance left relatively unchanged SAP=1 and SAP=100 datums must remain

21 EPC Fuel Prices ? Dont forget :- Fuel prices for EPC running costs are not the same as the SAP fuel costs EPC fuel prices are the average fuel prices over the past 6 months

22 SAP 2009 – CO 2 Emissions CO 2 emissions factors developed to include embodied CO 2 – will influence EI Rating, e.g. wood pellets (manufactured) have a higher emission factor than wood logs due to the energy/CO 2 resulting from manufacture. Will affect Environmental Impact (EI) Rating produced by the EPC ?

23 SAP 2009 - CO 2 Emission Factors Electricity + 23% Wood Pellets+ 12% Dual Fuel + 10% LPG + 5% Oil / House coal + 3% Mains Gas + 2% Wood Logs - 64% Smokeless - 12% Electricity displaced - 7% from grid

24 SAP 2009 - CO 2 Emission Factors Community Heating from : Waste heat + 222% Geothermal + 100% Biomass - 48% Waste combustion- 30% Biogas - 28%

25 SAP2009 EI Rating

26 CO 2 Emission Factors Fuel Type2006 kg CO 2 /kWh 2010 kg CO 2 /kWh % Change Biomass0.0250.013-48 Biogas0.0250.018-28 Waste Heat0.0180.058+222 Natural gas0.1940.198+2.1 Dual fuel (Mineral + Wood)0.1870.206+10.2 Lpg0.2340.245+4.7 Fuel oil0.2650.297+12.1 Anthracite0.3170.318+0.3 Smokeless Fuel0.3920.344-12.2 Coal0.2910.350+20.3 Grid supplied electricity0.4220.517+22.5 Grid displaced electricity0.5680.529-6.9

27 SAP 2009 – EI Rating Absolute values of CO 2 emissions affect the rating, rather than proportional changes Electricity is the main loser due to a large absolute value and a significant change in assumed emissions All electric dwellings will be affected

28 SAP 2009 – Net Effect The effect on the SAP and EI ratings is quite small in most cases, with all else being equal, the SAP and EI rating is reduced in the region of 2 - 4 points - significant ?

29 RDSAP 2009 Methodology

30 Construction data Building services data EPC content and presentation

31 RDSAP 2009 – Construction Data Increase to number of extensions Additional floor and roof types More detail for roofs and roof rooms Insulation options for timber framed walls

32 Up to Four Extensions (1) RDSAP 2009 can now cater for up to 4 extensions / different construction standards (in addition to main) This should remove the need to merge extensions together in most cases Data collection process per extension as before Are 5 construction standards enough ?

33 Up to Four Extensions (2) Remember, in RDSAP an extension is a part of the dwelling with a different thermal construction standard, not necessarily an addition to the original dwelling You should use the extension facility wherever there is a different construction type, age or insulation level Previous merging rules still apply to reduce to four extensions Alternative Wall – remains an option

34 Up to Four Extensions (3) Number of extensions present identified in General Details as before

35 Up to Four Extensions (4)

36 Up to Four Extensions (5) EPC performance details are now potentially more complicated in terms of additional construction details – Energy Performance Related Features – see EPC format later Therefore, in order to simplify the table :- – If any individual element type is less than 10% of the total element type area it will not be listed – The 3 elements of any given type with the largest area will be listed – If 2 elements of the same construction type have the same area then the priority order for display is main, extension 1, extension 2 etc

37 Up to Four Extensions (6)

38 Up to Four Extensions (7) Examples of real buildings Interface demonstration






44 Vertical Extensions Occasionally, dwellings are extended upwards by the addition of another storey Previously dealt with by alternative wall but this was limited to thermal performance selection from main RDSAP2009 now makes this modelling possible using the following references:- – Roof construction type – Same dwelling above – Floor construction type – Same dwelling below

45 Vertical Extension Example Enter as a two storey dwelling Enter the new storey at first floor level as an extension with :- Roof type – as standard options Floor type – same dwelling below Enter the ground floor original main dwelling with:- Roof type – same dwelling above Floor type – as standard options Note when using floor type same dwelling below there must be a corresponding part of the dwelling with roof type same dwelling above

46 Vertical Extension Example (2) See file ref. 67615

47 Floor and roof heat loss types In addition to providing roof and floor types that cater for vertical extensions, RDSAP2009 incorporates further types that should enable the Assessor to cope with a number of permutations that were previously only available to flats and maisonettes :- In particular, the semi-exposed and other dwelling options are useful for more involved geometries :-

48 Unusual Geometry – Example 1 House extended by the acquisition of the adjacent ground floor flat The main should be entered as a house The extension should be entered as a single storey extension with floor type as ground floor and roof type as other dwelling above n.b. If Different dwelling replaced by commercial premises, still enter as other dwelling above

49 Unusual Geometry – Example 1

50 Unusual Geometry – Example 2 Some dwellings may have other types of premises below – Other dwellings Offices Garages (including own integral garage) Additional RDSAP2009 options enable more effective modelling ?

51 Example 2 – Data Entry Split the dwelling into Main plus Extension To reflect floor type appropriately Office – semi-exposed floor (part heated) plus adjacent wall at ground level is non heat loss wall Internal car park - semi- exposed floor (unheated) Through archway – exposed floor

52 Example 2 – Data Entry

53 Flat Roof Insulation Options RDSAP 2009 provides additional options for the identification of roof insulation thickness Documentary evidence required, otherwise unknown should be selected Flat roof insulation options are as follows :- Selecting unknown assumes 50mm Remember to double thickness for modern foam etc.

54 Roof Rafter Insulation Options RDSAP 2009 provides additional options for the identification of roof insulation thickness at rafters Documentary evidence required, otherwise unknown should be selected Insulation options at rafters are as follows :- Selecting unknown assumes 50mm Remember to double thickness for modern foam etc.

55 Roof Room Insulation (1) RDSAP 2009 now has 4 options for the all elements option for roof room insulation: – All elements - 50mm – All elements - 100mm – All elements - 150mm – All elements – unknown (defaults to 50mm) This will enable you to record more than 50mm for the walls and sloping parts of the roof room, if you have visual or documentary evidence to support this Ceiling component insulation thickness still entered separately

56 Roof Room Insulation (2) Residual loft area Walls and sloping parts of the roof Flat ceiling

57 Timber Frame Walls Timber frame walls with retro-fit insulation (internal or external) can now be recorded Can be applied to any age band Options are – – External – Internal – As built – Unknown Effect is much reduced with more recent constructions

58 Secondary Glazing Amendment to conventions for April :- Input single glazing with secondary glazing as secondary glazing Input double glazing with secondary glazing as newer, i.e. 2002 or later, 2003 or later or 2006 or later for E&W, Scotland and NI respectively Evidence of existence and ability to re-fit required and recorded

59 RDSAP 2009 – Construction Data Interface Demonstration

60 RDSAP 2009 – Construction Data Practical Task 1



63 Refer to the document provided A brief history of the dwelling You will need to read through all of the details before commencing the task Initially, deal with strictly as presented, other discussions to follow

64 Practical Task 1 – Further Issues ? Wall between house and garage Original build vs extension 2 ? Utility room – extension ? Bedroom area above unheated garage Additional alternative walls ?

65 RDSAP 2009 – Building Services

66 RDSAP 2009 – Building services More options for and the inclusion of heat pumps and micro-chp in Product Database More options for primary and secondary heating Improved hot water only options Additional controls for community heating Additional fuels available Alternative data entry option for photovoltaic (PV) systems Minor modification to lighting data

67 RDSAP 2009 – Building Services Heat Pumps & Micro CHP

68 Heat Pumps Take heat from a low temperature source and upgrade it to a higher temperature Most commonly run on electricity but gas- fired heat pumps are also available Can be used in community heating schemes as well as individual systems

69 Heat Pumps - Schematic

70 RDSAP2009 Heat Pump Options Two heater type options :- – Heat pump – wet system – Heat pump – warm air Four system options :- – Ground to water / air – Ground to water / air with auxiliary heater – Water to water / air – Air to water / air Two emitter options - radiators or underfloor

71 RDSAP 2009 Heat Pumps

72 Heat Pump Default Efficiencies Type of heat pumpDefault efficiency Ground source320% Ground source with auxiliary heater300% Water source300% Air source250% Ground or water source – gas fired120% Air source – gas fired110% If Product Database is not used :-

73 BEDF to PCDF The Boiler Efficiency Database File (BEDF) AKA SEDBUK, is now referred to as the Product Database or PCDF (Product Characteristics Database File) All familiar gas and oil boiler options are retained but the database has been expanded to include :- – Heat pumps – Micro-chp Always use the PCDF whenever possible, SAP defaults are worst case assumptions

74 Heat Pump Database Appliance specific efficiencies should be used where the system specified is in the database 32 systems currently included in the database – 17 air source heat pump – 12 ground source heat pump – 3 exhaust air heat pumps Also need to specify emitter type – radiators, under floor etc., for efficiency adjustment

75 Heat Pump Database

76 Micro chp - Schematic

77 Micro chp -Images

78 RDSAP2009 Micro CHP Options New option for RDSAP2009 One system option within the Product Database, no RDSAP default option Select emitter type as per heat pump options

79 Plant Size Ratio - PSR For heat pumps and micro-CHP systems to function effectively they must be sized correctly for the dwelling. The sizing of the system in relation to the dwelling heating demand is known as the Plant Size Ratio - PSR RDSAP2009 automatically checks the PSR of the system you select from the PCDF against the calculated requirement for the dwelling and if incorrectly sized you will get a message PSR too high or too low

80 Plant Size Ratio – PSR (2) If you receive the message PSR too large or too low, then enter the heat pump as a SAP default heat pump in the usual way by selecting the system from the heating page :- For micro CHP – select condensing boiler Make a note in your site notes that you have been unable to select the system from the PCDF

81 Plant Size Ratio – PSR (3) RDSAP will identify any requirement for further heating based on the Plant Size Ratio Any space heating requirement not met by the Main System is assumed to be supplied by a secondary heating system (or a second main system) If neither is present then the software will assume portable electric heating will make up the remainder

82 RDSAP 2009 – Two Main Heating Systems

83 Two Main Heating Systems RDSAP2009 allows you to identify 2 main/primary heating systems when two main systems heat different parts of the property In addition to a (single) secondary heating system This would cater for :- – A large house served by two separate boiler systems – extensions ? – A house with a boiler and storage heaters for space heating – A main space heating system plus a water heating boiler that can be identified on the PCDF In order to use this facility you will need to know the fraction of heat supplied by each system – This can be based upon the % floor areas served

84 Two Main Heating Systems

85 Multiple Heating - Conventions 1.A Main System is generally a central heating system i.e. a centralised heat generator providing heat to several rooms via a distribution system but can also be electric storage heaters with on peak top up 2.If Main System 1 heats all habitable rooms, there is no Main System 2 unless it provides DHW only 3.Main systems 1 and 2 cannot be room heaters unless the dwelling is only heated by room heaters 4.If Main System 1 is community heating there is no Main System 2 5.A Main system Heat pump and micro-CHP systems (from database) can only be entered as Main Heating System 1 6.Main Heating System 1 is always the system that heats the living room, unless HP or micro-CHP, in which case it may be Heating System 2

86 Multiple Heating - Conventions 7.Two Main heating systems will be allocated in accordance with the % heated floor area served 8.If both Main Heating Systems are solid fuel, the fraction of heat from each must be entered as 50% 9.Where 2 Main Systems serve the same heating circuit, assume a 50/50 split unless documentary evidence is available to the contrary 10.If you have one option for Main 1 but 2 options for secondary then decide which secondary as normal – Main 2 is not used 11.If 2 room heater types present, then select as normal but enter as Main 1 and Main 2 12.Where there are 2 main heating systems and a heating recommendation is made, include Addendum 9

87 Multiple Heating - Recommendations Where two Main heating systems use the same fuel, any heating recommendation applies to both systems (RDSAP addresses separately) If the systems use different fuels, the recommendation applies to Main System 1 only Any heating controls recommendation will apply to Main System 1 only Include Addenda 9 for 2 Main Heating Systems :-

88 Secondary Heating Systems ? No change to the secondary heating selection process / assumed default of portable electric heating from RDSAP 2005 However, new single secondary heating system option :- – Bioethanol room heater ! Display 2 main + sec

89 RDSAP 2009 – Water Heating Options

90 Water Heating Options New water heating options for RDSAP2009 :- – Boilers/Circulators for hot water only – Range cookers for hot water only – Community heating for hot water only Boilers/Circulators for hot water only – is an additional system type option for regular water heating, the other 2 options are new water heating types

91 Water Heating Options In EPC online, you will now need to select the water type before selecting the water system:-

92 Water Heating Types Regular – all the current water heating systems and the new RDSAP2009 DHW-only boiler/circulators Range cookers – DHW only range cookers Community heating - DHW only community heating Previous workarounds are now redundant

93 Regular Water Heating Options SCREEN SHOT

94 Range Cooker Hot Water Options SCREENSHOT Reduced list in place

95 Hot Water Only Community Scheme Now 3 options relating to the type of community system:- – Community boilers – Community CHP – Community heat pump (electricity is the only fuel) If you cannot ascertain the system select community boilers If you cannot ascertain the fuel select mains gas Display water etc.

96 Community Heating Changes Community Heating Fuels – The full range of SAP 2009 community heating fuels are now available for RDSAP 2009 – Note introduction of Geothermal heat source and application ! Community Heating Controls – full SAP range available Additional control types - – Flat rate charging and TRVs – Charging system linked to use and room thermostat only – Charging system linked to use, programmer and room thermostat – Charging system linked to use and TRVs – Note flat rate vs charging system

97 Community Heating Fuels B30D – a mix of 30% biodiesel from cooking oil and 70% fuel oil Waste combustion - also known as Municipal Waste Incineration there are several system using waste as fuel in the UK Biomass –any wood based fuel (logs/chips/pellets) Biogas – using the gas produced from sewerage or land fill Waste heat from power stations – capturing and utilising the heat produced from power stations

98 RDSAP 2009 - New Fuels As well as the new community heating fuels, there are 2 new fuels for non-community heating systems: – LPG subject to special condition 18 (Documentary evidence) This is specific to a four towns; Colden, Llanfyllin, Llanwrtyd and Stornoway, where there is an independent LPG network and the LPG is charged at mains gas prices. This will not have an affect on the EI rating but will dramatically increase the SAP rating – why ? – B30K This is a biofuel, with 30% biodiesel from cooking oil and 70% kerosene.

99 RDSAP2009 - Photovoltaics If PV is present at a property you can now enter the kWp rather than the % of roof area Documentary evidence is required – look for a schematic drawing, possible adjacent to electricity meter or consumer unit Schematic should provide the following :- – Peak power – kWp – Estimate of pitch angle (default to 30 deg) – Overshading (if in doubt select modest)

100 Photovoltaics If PV is present at a property you can now enter the kWp rather than the % of roof area Documentary evidence is required

101 RDSAP2009 Lighting Identify the total number of fittings and the number of LEL fittings rather than the % of LEL The number of non-LEL fittings can then be used to calculate an appropriate indicative cost for the lighting recommendation Screen shot

102 Cooling Systems Note the tick box is only for fixed cooling systems only. Reversible heat pumps are entered as part of the heating system data entry. Cooling system produces a general advisory statement on the EPC

103 RDSAP 2009 – Building Services Interface Demonstration

104 Renewable Heat Incentive (RHI) Government run scheme to financially support the introduction of renewable technologies, similar to the Feed in Tariff (FIT) that supports PV installations Recipients of the RHI will receive a payment for each kWh of space heating and/or water heating produced from renewable sources such as :- – Heat pumps, Biomass boilers (not stoves), solar thermal & Bio-fuel boilers The deemed heat and water requirement of the dwelling is calculated using RDSAP methodology but adjusted for the region The tariff paid depends on the renewable source There are limitations to when and how they must be installed For more information go to

105 Renewable Heat Incentive (RHI) RDSAP2009 now includes an assessment of the heat demand of the dwelling that would qualify for the RHI Calculation adjusts heat demand in accordance with regional temperature demands (like NHER) and applies the installation of basic energy efficiency measures to finalise the RHI figure. Payments in the region of XXp/kWh for a time period of 20 years

106 RDSAP 2009 – Changes to the EPC Presentation and Format

107 RDSAP2009 – EPC Changes Revised page order New renewable heat incentive calculation Revised presentation to PRF table Additional bullet points for action - What can I do today Indicative installation costs incorporated

108 EPC Format The front page now highlights the possible savings (lower and higher cost measures only)

109 EPC Format Recommendations now on page 3 and include indicative installation costs Indicative costs will be updated regularly via the PCDF (formally BEDF) Indicative costs for loft and wall insulation will vary according to the size of the loft / wall Indicative costs for lighting will vary according to the number of fittings

110 Up to Four Extensions (5) EPC performance details are now potentially more complicated in terms of additional construction details – Energy Performance Related Features – see EPC format later Therefore, in order to simplify the table :- – If any individual element type is less than 10% of the total element type area it will not be listed – The 3 elements of any given type with the largest area will be listed – If 2 elements of the same construction type have the same area then the priority order for display is main, extension 1, extension 2 etc

111 EPC Format Performance related features table now uses stars to rate the energy efficiency Only the largest 3 walls/floors/roofs will be displayed

112 EPC Format Renewable heat incentive assessment (regional) Displays the heating and DHW requirement If there is no cavity wall insulation or loft insulation this is applied and the heat/DHW requirement is re-calculated

113 Revised Data Collection Forms Revised set of data collection forms to be issued shortly Forms P1 & P2 edited with the main changes New Form P3 for data entry for extensions 3 and 4 Two Main Heating Systems will require an H form for each Available through NES one Useful documents Assessor forms will require similar annotation

114 RDSAP 2009 Getting to grips with the changes – Q & A Mike Tofts Client Services

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