1. Getting to Zero Carbon Heather Stamp Low Carbon R&D Manager
Getting to Zero Carbon Heather Stamp Low Carbon R&D Manager National Energy Services

2. Code for Sustainable Homes
Energy – 9 criteria
Water – 2
Materials – 3
Surface water run-off – 2
Waste – 2
Pollution – 2
Health and well being – 4
Management – 4
Ecology – 5
Total – 33

3. Plan Assessor Outputs ENE 1 – DER, TER, TFA
ENE 2 – HLP (box 38 in SAP)
ENE 7 – CO2 emissions for space heating, water heating, fans and pumps and lighting, CO2 emissions reduction from LZC technologies

4. Getting to Zero Carbon Building Regs 2006
Best Practice Standard Insulation
Code Level 3 – 25% lower DER
Advanced Standard Insulation
Code Level 4 – 44% lower DER
Code Level 5 – zero DER
Code Level 6 – zero total CO2

5. Base Case Regs 2006 Semi Detached House East Pennines
88 square metre floor area
Gas A rated combi boiler
Partial cavity fill, AAC blocks & U = 0.29
Roof: 300m insulation U = 0.14
Windows: Double glazed super low E argon U = 1.8
Thermal bridging y = 0.08
Air Permeability 9 m3/hm2

6. NHER Plan Assessor

7. Base Case Regs 2006 DER (CO2 /m2 /year) 22.7 Total (CO2 /m2 /year)
35.6
Annual Fuel Bill (£/year)
664
NHER (0 to 20)
9.8

8. Getting to Level 4 DER CO2 /m2 /year Total CO2 / m2 / year Fuel Bill
NHER
Base Case
B Regs 2006
22.7
35.6
664
9.8
Best Practice
Code Level 3
16.9
29.1
594
10.9
Advanced Fabric
14.2
26.1
564
11.4
Advanced Fabric + Solar Thermal
Code Level 4
11.7
23.5
535
11.8

9. Fabric Measures Measures 2006 Regs Level 3 Level 4 Walls 0.29 0.21
0.15
Main roof
0.14
0.12
0.09
Ground floor
0.25
0.16
Windows
1.80
1.50
0.80
Doors
3.00
1.00
0.70
Thermal bridging
0.08
0.04
0.02
Air Perm. m3/hm2 9 3 1

10. Best Practice Fabric Standard
Walls
Plasterboard on dabs, dense block, 150 glass fibre filled cavity with plastic wall ties, brick
Main roof
350 mm rockwool
Ground floor
Beam and block 100 PU chipboard
Windows
Double Glazed Super Low E Argon
Thermal Bridging
y=0.04

11. Advanced Fabric Standard
Walls
wet plaster, dense block, 250 glass fibre filled cavity with plastic wall ties, brick
Main roof
50 Kingspan PU board, 400mm rockwool
Ground floor
Beam and block 200 PU chipboard
Windows
Triple glazed super low E argon
Thermal Bridging
y=0.02

12. Heating & Lighting Measures 2006 Regs Level 3 Level 4
Low Energy Lighting
44.4%
75%
100%
Main Heating
Gas Combi A
Same
Heating & Controls
Prog, Stat & TRVs
Delayed start; compensator
Secondary Heating
Balanced Flue Gas
Fan Flue & appliance stat

13. Getting to Levels 5 & 6 DER CO2 / m2 / year Total CO2 / m2 / year
Fuel Bill
£/ year
NHER
Advanced + Solar Thermal
Code Level 4
11.7
23.5
535
11.8
Level 4 +
2.7 kWp PV
Code Level 5
-0.36
14.79
442
13.4
4.25 kWp PV (34 sq m) + Wood Heating
Code Level 6
(12.28 for L&A)
-13.3
-1.1
380
15.0
5.25 kWp PV (42 sq m)
-13.11
-0.83
298
15.7

14. Emissions across Levels

15. Photovoltaics & Wind Turbines
0.125kWp per m2 of PV panel area
Maximum roof area 28m2
Remainder must be off site
Running costs highly dependent on pence per unit for exported electricity
Wind turbines better done centrally as output related to (wind speed)3 and speeds are low and variable in many cases

16. Low Energy Appliances Reduce demand before adding renewables
A** rated appliances

17. Key Conclusions Maximise fabric improvements
Minimise electricity consumption
Level 4 achievable with solar thermal
Level 5 needs PV over remaining whole roof area
Level 6 requires off site generation
Carbon strategy + running cost info

18. Key Issues / Questions Measuring zero carbon
Ratings not sensitive to appliances, power showers, spray taps etc.
Cost per unit of exported electricity
High cost per unit of low carbon options
High capital costs of low carbon technologies
Consumers need fuel bill estimates too
Also focus on demand reduction as well as design