Www.parityprojects.com Modelling properties and advising occupiers for the Green Deal – In...

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Modelling properties and advising occupiers for the Green Deal – In practice

06/10/11

Chris Newman

Parity Projects


Two angles of attackTop Down

Stock Assessment

Housing Providers

Informs strategy

CROHM

Bottom UpIndividual property

assessment

Private residences

Directly informs choices

HEMP


• Individual HomesHome Energy Masterplan

• Housing stockCROHM

Parity information and analysis


Pay As You Save Trial - Sutton

• Carried out the analysis for homeowners on behalf of B&Q working with Sutton Council• Interest free and 40% discount

• ~ 100 homes assessed with 67 going onto have work carried out

• Gave B&Q consulting advice on process and measures throughout – e.g. extra options, PV and windows


The process

• Survey arrangement (B&Q)• Data collection (Parity Projects) with B&Q/ROK

person present• Client debrief (Parity Projects) – what we will

evaluate/exclude• Data Analysis (Parity Projects) – offsite• Report delivery (Parity Projects)


Home Energy Masterplan- what’s the difference

• Advice not benchmarking• Occupational/behavioural inputs – actual use• Ability to calibrate• Recommend initiatives as:

• Individual measures• Packages of measures

• Present their benefit alongside their indicative cost• Technical – BREDEM based with bespoke modules for

DHW, lights appliances etc. Also a large supporting database of materials, costs, products, appliances etc


Home Energy Masterplan- what’s the difference


What we learnt

• Every home really is different


Every home is differenta cliché but a major problem when financial advice is being given


What we learnt• Every home really is different• Customers like having an independent advisor• 3 people bumbling around a house gets a bit crowded• Benchmarking tools (RdSAP and SAP) are not suitable

for giving detailed recommendations and in particular financial advice

• Getting everything done in one visit would be hard and probably not desirable


What we learnt• Do not be fooled into thinking home assessments are trivial –

under every stone...• Primary modelling:

• Under heated and non-standard heated dwellings• Radical differences in DHW and electricity loads

• Analysis:• Order of attack• Amending the base case – boilers• Pricing......

• No-one wants their whole house renovated...front wall only...• Golden Rule [s] – myriad issues: prices, financing rates,

sequencing, part subsidy


Top Down – Stock AssessmentCorporate Priorities

Existing Housing Data

Draft stock assessment

Housing Retrofit plan

Detailed Plans: Unit and/or Archetype level assessments

Budget, Plans

Maintenance

Consultation, corporate priorities

Data improvement and strategy


• EPC• CP12s• Street survey• Archetype analysis• Cloning

Carbon AssessmentStage 1: data


239.745.0

634.22.9

886.4758.5

29.6187.6

119.2135.5

46.6715.417

516.5219.859

338.82634.8

445.4144.5

603.1108.5

1.0495.9

48.893.3

3.0289.6

193.644.4

201.558.289.3

210.74.2

2368.3344.5

2061.359.7

26.01872.8

95.69.6

3355.71193.2

1014.12253.0

1186.2

0.0

1000

.0

2000

.0

3000

.0

4000

.0

Upgrade old double glazing to new double glazingUpgrade new boiler to combi, remove hot water cylinder

Solar hot water (4m2 flat plate)Replace 38mm insulated hot water cylinder with new cylinder with 50mm foam insulation

Upgrade single glazing to new double glazingInstall 4m2 solar PV panels

Insulate loft from 200mm to 270mmUpgrade old boiler to combi (from ~75% efficient to new), remove hot water cylinder

Replace 25mm insulated hot water cylinder with new cylinder with 50mm foam insulationUpgrade old boiler (from ~75% efficient to new)

Install external solid wall insulation to solid wall (U becomes 0.25)Install external solid wall insulation to concrete frame tower block (U becomes 0.25)

Upgrade old boiler to combi (from ~70% efficient to new), remove hot water cylinderInstall external solid wall insulation to concrete frame building (U becomes 0.25)

Install external solid wall insulation to tower block with external concrete structure (U becomes 0.25)Insulate loft from 150mm to 270mm

Upgrade old boiler (from ~70% efficient to new)Insulate loft from 100mm to 270mm

Upgrade old boiler to combi (from ~65% efficient to new), remove hot water cylinderUpgrade 5 year old cold appliances to top rated new


Install internal solid wall insulation to solid wall (U becomes 0.175 ~100mm PIR)Insulate loft from 75mm to 270mmInsulate loft from 50mm to 270mm

Upgrade controls to full: add TRVsUpgrade 10 year old cold appliances to top rated new

Install internal solid wall insulation to solid wall (U becomes 0.35 ~50mm PIR)Upgrade 15 year old cold appliances to top rated new

Add hot water cylinder thermostatUpgrade controls to full: add Room Thermostat

Replace on peak electric heatersUpgrade controls to full: add TRVs and room thermostat

Replace storage heaters with gas central heatingInsulate cavity walls

Upgrade communal heating: install Wood Chip boilerInstall cavity wall insulation on side of Wimpey houses

Install CFLs where possible (half of light fittings in dwelling)Install CFLs where possible (three quarters of light fittings in dwelling)

Install CFLs where possible (most light fittings in dwelling)Install CFLs where possible (quarter of light fittings in dwelling)

2 shorter heating periods instead of 1 all-day heating period2 shorter heating periods instead of heating 24 hours

Turn down heating from 20 to 18 degrees CTurn down heating from 22 to 18 degrees CTurn down heating from 24 to 18 degrees C

Total Possible Carbon saving (tCO2) all stock

£26,957.36£22,924.43

£19,735.08£19,707.86£19,565.00£18,414.73

£9,471.90£7,578.97£7,572.17£7,215.67

£5,634.27£4,531.79£4,343.53£4,340.80£4,155.04£4,056.11

£3,716.84£3,022.16£2,925.01£2,820.33£2,782.52£2,742.55

£2,130.42£2,087.92£2,074.90

£1,800.73£1,667.23£1,656.42£1,557.83£1,444.23

£826.57£790.78£789.93

£651.03£642.62

£557.19£223.77

£129.17£123.32£121.23£116.67

£100

.00

£500

.00

£2,5

00.0

0

£12,

500.

00

Upgrade old double glazing to new double glazingUpgrade new boiler to combi, remove hot water cylinder

Solar hot water (4m2 flat plate)Replace 38mm insulated hot water cylinder with new cylinder with 50mm foam insulation

Upgrade single glazing to new double glazingInstall 4m2 solar PV panels

Insulate loft from 200mm to 270mmUpgrade old boiler to combi (from ~75% efficient to new), remove hot water cylinder


Install external solid wall insulation to solid wall (U becomes 0.25)Install external solid wall insulation to concrete frame tower block (U becomes 0.25)

Upgrade old boiler to combi (from ~70% efficient to new), remove hot water cylinderInstall external solid wall insulation to concrete frame building (U becomes 0.25)

Install external solid wall insulation to tower block with external concrete structure (U becomes 0.25)Insulate loft from 150mm to 270mm

Upgrade old boiler (from ~70% efficient to new)Insulate loft from 100mm to 270mm

Upgrade old boiler to combi (from ~65% efficient to new), remove hot water cylinderUpgrade 5 year old cold appliances to top rated new


Install internal solid wall insulation to solid wall (U becomes 0.175 ~100mm PIR)Insulate loft from 75mm to 270mmInsulate loft from 50mm to 270mm

Upgrade controls to full: add TRVsUpgrade 10 year old cold appliances to top rated new

Install internal solid wall insulation to solid wall (U becomes 0.35 ~50mm PIR)Upgrade 15 year old cold appliances to top rated new

Add hot water cylinder thermostatUpgrade controls to full: add Room Thermostat

Replace on peak electric heatersUpgrade controls to full: add TRVs and room thermostat

Replace storage heaters with gas central heatingInsulate cavity walls

Upgrade communal heating: install Wood Chip boilerInstall cavity wall insulation on side of Wimpey houses

Install CFLs where possible (half of light fittings in dwelling)Install CFLs where possible (three quarters of light fittings in dwelling)

Install CFLs where possible (most light fittings in dwelling)Install CFLs where possible (quarter of light fittings in dwelling)

2 shorter heating periods instead of 1 all-day heating period2 shorter heating periods instead of heating 24 hours

Turn down heating from 20 to 18 degrees CTurn down heating from 22 to 18 degrees CTurn down heating from 24 to 18 degrees C

Avg £ required per tCO2 saved

More cost effective

Greater total potential

£ / tCO2 / year Total improvement possible (CO2 / year)

Stage 2: Stock Assessment


CO2

Tenant FuelBills

SAP

Stage 2: Stock Assessment


Parity’s key takeaways• Don’t try and shortcut the assessment of a property –

assessments based on averages or benchmarking tool just aren’t worth it

• Housing providers should get their data in order and understand their strategy for their stock – it can be relatively inexpensive for the valuable guidance it provides

Chris Newman - 0208 874 6433

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